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[China Aluminum Network] Welding methods that can connect high silica and alumina include: fusion welding, brazing, and solid phase welding. The performance of fusion-welded joints is poor, and generally high-energy density welding with rapid thermal cycling and low heat input, including electron beam welding and laser welding, is helpful to reduce the defects caused by fusion welding. Therefore, the research conducted in this area in recent years many. The brazing method is a metal welding method in which the metal is melted after the base metal is melted, and the space is filled with the molten metal after dissolution and diffusion. Solid-state welding technology refers to the welding method that applies static or dynamic pressure to the surface of the weldment after heating, with or without heating, and solidifies the two materials when the base material does not melt. Friction welding, diffusion welding, explosion welding, ultrasonic welding and so on are all examples. High pressure silicon aluminum alloy available pressure welding methods are: friction welding, vacuum diffusion welding and so on.
Laser welding studies have shown that high-silicon-aluminum materials need to be connected using low-power fusion welding methods. Due to the high content of Si in the alloy, needle-like eutectic silicon and thick plate-like polygons are formed in the metal structure of the weld. The primary silicon, severely fractured the matrix; the metal in the near-seam region is prone to overheating and grain growth, resulting in a significant decrease in the mechanical properties of the weld and loss of use value. Laser welding has the advantages of large power density, large ratio of depth to width of weld, small heat affected zone, small workpiece shrinkage and deformation, and fast welding speed. This welding method is suitable for high-silicon-aluminum welding. Zhang Weihua et al. studied the microstructure and properties of ZL109 silicon aluminum alloy CO2 laser welded joints and obtained dense and fine grained joints. The heat input of the welding has a significant effect on the mechanical properties of joints, and the heat input increases, and the joint resistance increases. Tensile strength and elongation after breaking both increased first and then decreased. When the heat input was 44 J/mm, the tensile strength and elongation after breaking reached a large value, which were 121.2 MPa and 4.3%, respectively.
Electron beam welding Electron beam welding uses high-speed electrons generated by a high electric field to form a stream of electrons after focusing, hitting the welded part of the metal to be welded, transforming its power into heat, and welding the welded metal. The electron beam has high energy density, strong penetration ability, large depth-to-width ratio of the weld, fast welding speed, and low input energy, so the heat affected zone is small and welding distortion is small. Therefore, the electron beam welding quality is good, and the mechanical properties of the weld seam are high. Shi Lei et al. performed vacuum electron beam welding on piston crowns and forged piston skirts of AlSi12CuMgNi aluminum alloy extrusion castings, and studied the microstructure and mechanical properties of welded joints under optimized process conditions. The results show that the joints are well-formed, there is no obvious heat affected zone, and the weld seam is narrow; the weld zone is mainly composed of fine α-Al phase, α+Si eutectic, primary crystal silicon and Mg2Si and other strengthening phases; the center of the weld is formed. It is a fine equiaxed crystal and a dendrite; the fused zone mainly consists of columnar crystals. The joint strength is not lower than that of the squeeze casting parent metal. The hardness of the weld is higher than that of the parent metal. A large number of torn and dissociated surfaces are distributed on the tensile fracture surface of the welded joint, showing brittle fracture.
Different from brazing and welding methods, conventional brazing is the use of (or automatically generated in the process) brazing material with a lower melting temperature than the base metal. The operating temperature is lower than the solidus of the base metal and higher than the liquidus of the brazing material. A welding technique. During brazing, the workpiece is usually heated by the entire body or evenly around the brazing seam. Therefore, the relative deformation of the workpiece and the residual stress of the welded joint are much smaller than those of the welding. In today's manufacturing industry, high-silicon-aluminum materials are generally used in high-precision devices in aerospace machinery manufacturing. For these devices brazed welding, the impact on the workpiece is also small. Since the high-silicon aluminum alloy contains a hard silicon phase, the solder has poor wetting properties to the series of materials, and it is difficult to achieve an effective connection by an ordinary soldering method. Hou Ling et al. are conducting high-silicon-aluminum brazing tests. The Ni-Cu-P, Au and Cu layers were pre-plated on the 65Si35Al alloy substrate first, and then the Ni-Cu-P, Au and Cu layers were separately plated, which effectively improved its soldering performance. Using Sn-Pb, Sn-Ag-Cu, Sn-In, and Sn-Bi solders to perform soldering analysis on 65Si35Al alloy samples with different coatings in the furnace, including the use of metallurgical microscopy and spectroscopy. The analytical (EDS) function of scanning electron microscopy and other testing methods were used to examine the microstructure, morphology and phase composition of the welded joints. The influence of brazing process parameters on the quality of the brazed joints of the 65Si35Al alloy was analyzed. The causes of macro defects and micro defects in joints and the differences in the wetting properties of brazing materials for different coatings.
Friction welding Friction welding is the use of the heat generated by the end faces of the workpieces moving against each other and friction, so that the ends reach the thermoplastic state, and then quickly forged to complete the welding method. This welding method has not been studied for a long time. It was a process proposed in 1991, but it has also been rapidly developed. N. ARODRIRIGUEZ et al. studied the friction welding of A319 and A413 aluminum-silicon cast alloys. The experimental results show that the distance between the particles in the weld zone decreases and the corresponding hardness increases. Ji Yajuan et al. studied the hardness, microstructure and mechanical properties of friction stir welding joints of ZL114A aluminum alloy under different parameters. Experimental results: The microstructure of the welding center area is a fine equiaxed crystal. The silicon particles were refined in the welding process and evenly covered the entire weld zone. The grain of the weld was small, uniform and dense, and no defects such as blowhole cracks were observed.
Diffusion welding diffusion welding is the use of localized plastic deformation between the materials in contact with each other at high temperatures, the close adhesion between the surfaces and the interdiffusion between the surfaces to generate metal bonds, thereby obtaining a certain form of integral joints. Interdiffusion between atoms is the basis for achieving diffusion connections. Diffusion welding requires the use of relatively large pressures, requires high precision in the mating surface, makes it difficult to uniformly pressurize complex components, and even requires expensive and complicated fixtures. Therefore, diffusion welding Requirements more high-end. Diffusion welding can be divided into dissimilar material diffusion welding, diffusion welding of the same kind of material, adding intermediate layer diffusion welding, superplastic forming diffusion welding, isostatic pressure diffusion welding, transitional liquid phase diffusion welding (TLP), among which transitional liquid phase diffusion welding. (TLP) combines the advantages of brazing and solid-phase diffusion welding to form a new joining method. The principle is to place the intermediate layer alloy matching the matrix material on the connecting surface. Domestic and foreign scholars have begun to deepen the method. Research. Research on TLPs in China is still in its infancy. It is mainly aimed at welding processes for some dissimilar hard-to-weld metals. Compared with domestic research, the research direction of foreign countries is broader. It involves not only the research of the process, but also the simulation of TLP welding, and focuses on the key factors of the TLP process. At present, the research on TLP at home and abroad mainly includes the following aspects: Engineer Wang Xuegang of Shandong Electric Power Research Institute adopts self-developed Fe-Ni-Si-B amorphous metal foil tape as intermediate layer material and TLP process in open gas. In the protected environment, the steel pipe used in the welding power station can obtain continuous and uniform weld microstructure and better mechanical properties than manual fusion welding. The process parameters include intermediate layer material, heating temperature, holding time, pressure, and requirements for welding end surfaces. Liu Liming and Niu Jitai et al. used vacuum diffusion welding to weld aluminum matrix composite SiCw/606Al. Through series of experiments, the results showed that when the material is used for diffusion welding, the welding temperature is the main process parameter that affects the strength of the joint. When the welding temperature is between the matrix In the liquid-solid two-phase temperature range of the aluminum alloy, a liquid matrix metal appears on the bonding surface, and a higher joint strength can be obtained. Many researchers at home and abroad are engaged in diffusion welding research, but there are not many researches on diffusion welding of silicon aluminum alloys. The research prospects and exploration space in this area are relatively long-term.
High-silicon aluminum alloys play an important role in aerospace, aviation, automotive, and space technology. Research on high-silicon aluminum alloys is becoming more and more in-depth. In the development and application of high-silicon aluminum alloys, related welding methods, It is also a big trend to invest more in welding technology. The application of these fields to the high-silicon-aluminum welding joints requires very high performance, coupled with the high silicon-aluminum material containing silicon, which is easy to oxidize, which has high requirements for high-silicon-aluminum welding technology and welding methods. Welding and soldered joints can not meet the welding requirements of the weldment in some applications, and use more advanced welding methods - diffusion welding is the trend of silicon aluminum alloy welding research.
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The price increase was triggered by the 300 yuan/t increase in the production of titanium dioxide powder in Sichuan Longyan. Nearly 30 domestic producers in the Southwest, East China, Central China, South China, and Northeast China have announced that they will increase their prices. 500 yuan / ton; the current domestic market conditions temporarily stable, monitoring data show that most of the sulfuric acid rutile and anatase titanium dioxide mainstream offer in 10600-11200 yuan / ton and 8500-9500 yuan / ton, the southwest price range In the range of 10,600-11,000 yuan/ton, the market area in Shandong is 11,000-12,000 yuan/ton, and the price range in central China is 10800-11000 yuan/ton;
After you read it, you think that it has gone too fast? In fact, in the long term, the price of titanium dioxide is still at a low level. The data shows that the price of titanium dioxide in all regions fell by 15% year-on-year; on the other hand, the overall cost of titanium dioxide production is generally around 10,000 yuan/ton, plus environmental protection investment, sales costs, and funds. Although the cost of different companies in different regions, different resource allocation, but the sales price of sulfuric acid rutile titanium dioxide market in accordance with the current environmental level, resource allocation and other factors calculated 13000-15000 yuan / ton is more reasonable, titanium dioxide enterprises to achieve profitability. The rise also belongs to the normal price rebound. However, the continuation of this increase is more worth considering.
At present, the market is stable and the inventory pressure is not high, but the downstream manufacturers have no intention of selling goods, and the transaction volume is not large. The industry just needs to support the price, the company's price increases are constantly being implemented, the recent low-end transaction prices have gradually decreased, and the market supply and demand tend to be dynamically balanced. Some producers in the southwestern and central regions of China, due to the operating rate and other issues, are in tight supply on the spot market. Some manufacturers have already forecasted the expected increase in April. In the short-term, there is a bubble in this price increase. The price still needs time to digest.
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[China Aluminum Network] 1. This product makes full use of renewable resources, energy conservation and environmental protection.
2, no burning, no hollowing, no seams, initial condensation fast, direct bonding with the grass-roots level, forming an integrated insulation system, a solid structure. This greatly improves the insulation performance.
3, strong bonding ability, no cracking, cold, thermal bridge deformation coefficient is small, in the insulation system structure, do not have to brush the interface agent on the base wall and the use of cracking glass fiber mesh cloth. The thickness of the insulation layer is within 120mm and can be continuously formed on the same day. The construction procedures have been reduced, the speed of construction has been accelerated, and labor and time have been saved, thereby reducing costs and achieving good economic results.
4. The product has added near-nano-scale fiber imported from abroad. There are hundreds of millions of criss-crossing fibers per cubic meter of material, which improves the thermal insulation performance, crack resistance, compressive strength, adaptability, and fatigue resistance of the product. Ability, shock resistance, resistance to cold and hot bridges, and durability.
5, excellent thermal insulation performance, thermal conductivity of the detection value of 0.046-0.048W / (m? K), SQ aluminum new insulation material is in the country on the premise of building energy conservation standards continue to improve (total energy saving 65 For development and production, the thickness of the insulation layer in most areas of China is only between 30mm and 100mm to meet the insulation requirements of the building wall.
6. Accurate ratio: The packaging adopts silica-alumina gel material and polyphenyl granule aggregate separately packaged, and the ratio of 1:1 bags ensures that the product ratio is accurate. The polyphenylene granule aggregate is specially processed and eliminated during stirring. Disadvantages of easy flying in the process.
Ink
[China Aluminum Network] 1. This product makes full use of renewable resources, energy conservation and environmental protection.
2, no burning, no hollowing, no seams, initial condensation fast, direct bonding with the grass-roots level, forming an integrated insulation system, a solid structure. This greatly improves the insulation performance.
3, strong bonding ability, no cracking, cold, thermal bridge deformation coefficient is small, in the insulation system structure, do not have to brush the interface agent on the base wall and the use of cracking glass fiber mesh cloth. The thickness of the insulation layer is within 120mm and can be continuously formed on the same day. The construction procedures have been reduced, the speed of construction has been accelerated, and labor and time have been saved, thereby reducing costs and achieving good economic results.
4. The product has added near-nano-scale fiber imported from abroad. There are hundreds of millions of criss-crossing fibers per cubic meter of material, which improves the thermal insulation performance, crack resistance, compressive strength, adaptability, and fatigue resistance of the product. Ability, shock resistance, resistance to cold and hot bridges, and durability.
5, excellent thermal insulation performance, thermal conductivity of the detection value of 0.046-0.048W / (m? K), SQ aluminum new insulation material is in the country on the premise of building energy conservation standards continue to improve (total energy saving 65 For development and production, the thickness of the insulation layer in most areas of China is only between 30mm and 100mm to meet the insulation requirements of the building wall.
6. Accurate ratio: The packaging adopts silica-alumina gel material and polyphenyl granule aggregate separately packaged, and the ratio of 1:1 bags ensures that the product ratio is accurate. The polyphenylene granule aggregate is specially processed and eliminated during stirring. Disadvantages of easy flying in the process.
Inkjet Receptive Coating, Anticorrosion Pigments, Matting Agent
jet Receptive Coating, Anticorrosion Pigments, Matting Agent
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[China Aluminum Network] 1. This product makes full use of renewable resources, energy conservation and environmental protection.
2, no burning, no hollowing, no seams, initial condensation fast, direct bonding with the grass-roots level, forming an integrated insulation system, a solid structure. This greatly improves the insulation performance.
3, strong bonding ability, no cracking, cold, thermal bridge deformation coefficient is small, in the insulation system structure, do not have to brush the interface agent on the base wall and the use of cracking glass fiber mesh cloth. The thickness of the insulation layer is within 120mm and can be continuously formed on the same day. The construction procedures have been reduced, the speed of construction has been accelerated, and labor and time have been saved, thereby reducing costs and achieving good economic results.
4. The product has added near-nano-scale fiber imported from abroad. There are hundreds of millions of criss-crossing fibers per cubic meter of material, which improves the thermal insulation performance, crack resistance, compressive strength, adaptability, and fatigue resistance of the product. Ability, shock resistance, resistance to cold and hot bridges, and durability.
5, excellent thermal insulation performance, thermal conductivity of the detection value of 0.046-0.048W / (m? K), SQ aluminum new insulation material is in the country on the premise of building energy conservation standards continue to improve (total energy saving 65 For development and production, the thickness of the insulation layer in most areas of China is only between 30mm and 100mm to meet the insulation requirements of the building wall.
6. Accurate ratio: The packaging adopts silica-alumina gel material and polyphenyl granule aggregate separately packaged, and the ratio of 1:1 bags ensures that the product ratio is accurate. The polyphenylene granule aggregate is specially processed and eliminated during stirring. Disadvantages of easy flying in the process.
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Only to oxygen, silicon is the most abundant element in Earth's crust. It is found in rocks, sand, clays and soils, combined with either oxygen as silicon dioxide, or with oxygen and other elements as silicates. Silicon's compounds are also found in water, in the atmosphere, in many plants, and even in certain animals.
Silicon is the fourteenth element of the periodic table and is a Group IVA element, along with carbon germanium, tin and lead. Pure silicon is a dark gray solid with the same crystalline structure as diamond. Its chemical and physical properties are similar to this material. Silicon has a melting point of 2570° F (1410° C), a boiling point of 4271° F (2355° C), and a density of 2.33 g/cm3.
When silicon is heated it reacts with the halogens (fluorine, chlorine, bromine, and iodine) to form halides. It reacts with certain metals to form silicides and when heated in an electric furnace with carbon, a wear resistant ceramic called silicon carbide is produced. Hydrofluoric acid is the only acid that affects silicon. At higher temperatures, silicon is attacked by water vapor or by oxygen to form a surface layer of silicon dioxide.
When silicon is purified and doped with such elements as boron, phosphorus and arsenic, it is used as a semiconductor in various applications. For maximum purity, a chemical process is used that reduces silicon tetrachloride or trichlorosilane to silicon. Single crystals are grown by slowly drawing seed crystals from molten silicon.
Silicon of lower purity is used in metallurgy as a reducing agent and as an alloying element in steel, brass, alumiinum, and bronze. When small amounts of silicon are added to aluminum, aluminum becomes easier to cast and also has improved strength, hardness, and other properties. In its oxide or silicate form, silicon is used to make concrete, bricks, glass, ceramics, and soap. Silicon metal is also the base material for making silicones used in such products as synthetic oils, caulks and sealers, and anti-foaming agents.
In 1999, world production was around 640,000 metric tons (excluding China), with Brazil, France, Norway and the United States major producers. This is a continued decline compared to the last several years (653,000 tons in 1998 and 664,000 in 1997). Though data is not available, China is believed to be the largest producer, followed by the United States. One estimate puts China's production capacity as high as 400,000 metric tons per year, with over 400 producers. Exports from this country have increased in recent years.
Consumption of silicon metal in the United States was roughly 262,000 metric tons, at a cost of 57 cents per pound. The annual growth rate during 1980-1995 was about 3.5% for silicon demand by the aluminum industry and about 8% by the chemical industry. Demand by the chemical industry (mainly silicones) was affected by the Asian economic crisis of the late 1990s.
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Since the beginning of 2016, the market price of titanium dioxide has continued to rise, coupled with the pulling of foreign trade, driving the continuous rise in the price of titanium dioxide.
From January to May, the cumulative export of titanium dioxide nationwide was 28,4623.7 tons, an increase of 5,665,800 tons, an increase of 24.85%. In May 2016, the country`s export of titanium dioxide was 7,1231.6 tons, which was the highest in the history of monthly export volume, which was an increase of 2,3957.5 tons, an increase of 50.68% year-on-year; an increase of 1,5564.2 tons, an increase of 27.96%; the first three exports. The countries are India, the United States, and South Korea. The export volume of titanium dioxide in May accounted for about 30% of the national titanium dioxide production for the month, which played a key role in the improvement of the recent industry boom. However, in terms of the average unit price of imported titanium dioxide in May, the import price of US$2,298.84/ton was 1.54 times the export price of US$1541.1/ton.
From January to May, the cumulative amount of titanium dioxide imported nationwide was 69211.4 tons, a year-on-year decrease of 1,1811.2 tons, a decrease of 14.58%. In May, the national import volume of titanium dioxide was 1,5904.6 tons, a year-on-year decrease of 3470.0 tons, a reduction of 17.91%, an increase of 2797.7 tons, an increase of 21.34%; the top three countries or regions of import were Taiwan, Australia, and the United States.
Titanium dioxide prices pick up return to rational
Since the 1-2 quarter of 2012, the titanium dioxide industry has gradually shown a sluggish market. The market demand has shrunk and the price has dropped. Although the short-term [rebounds" and [crunch" in the middle, it is not enough to change the general trend of the downward trend. There is a big difference from the hot scenes in 2010-2011. Thanks to the gradual recovery of the global economy and the country's policy of encouraging exports, a good balance of production and sales in the entire industry emerged from 2013 to 2014: In 2013, exports exceeded 400,000 tons for the first time, reaching 403,000 tons, accounting for the current year. The national output of 18.7%; 2014 exports increased by 37% over the previous year, reaching 552,000 tons, accounting for 22.7% of the country's total production. However, by 2015, especially in the second half of the year, due to the slowdown of global economic growth and weak domestic market demand, titanium dioxide prices have been [diving" all the way, hitting historical lows. Most of the titanium dioxide manufacturers except some large companies The Department chose to restrict production and stop production to reduce losses. The export volume of titanium dioxide also decreased: In 2015, the export volume was 53,8394.4 tons, a year-on-year decrease of 1,4084.8 tons, a decrease of 2.5%.
In 2016, under the pressure of global and Chinese economic downturn, the price of titanium dioxide began to bottom out. Different from previous years, the current titanium dioxide inventory is lower than the conventional level, and even some products are "hard to find"; exports have also repeatedly hit a record high, although the domestic market demand is not yet strong, but the rigid demand and titanium dioxide production and inventory Can match. From the beginning of July to the beginning of July, domestic titanium dioxide companies experienced an [eight-pronged rise", which laid the trend for a reasonable market price in the first half of the year. The overall titanium dioxide industry in China is in a rising channel. The price of titanium dioxide in 2016 is expected to become reasonable. Based on. According to statistics, the current domestic market is about 13,000 yuan/ton. The increase in the price of titanium dioxide was mainly due to the shrinkage of production capacity of domestic and foreign titanium dioxide enterprises and the improvement of supply and demand patterns. Real estate new construction area and car sales data show that demand continues to pick up this year. At the same time, the supply side was also affected by multiple factors, overseas production capacity was shut down, domestic environmental protection high standards eliminated backward production capacity, and industry integration increased. In addition, the prices of titanium concentrates in the upstream raw materials continued to be strong, and recent Panxi mines stopped production due to environmental pressure, tighter mineral resources and larger price increases, which also supported the downstream price of titanium dioxide.
Industry promotes supply-side reform and accelerates merger integration
With the advancement of supply-side reforms in China's titanium dioxide industry and the acceleration of industry mergers and acquisitions, the industry supply and demand pattern in the future is expected to further improve.
Chlorination titanium dioxide progress
As we all know, the chlorination process has many advantages over the sulfuric acid process and is the mainstream process for the development of the titanium dioxide industry in the world. The development of chlorinated titanium dioxide in China can be said to be difficult and costly. Fortunately, although the process is difficult, although the price is heavy, China's chlorination titanium dioxide has been a breakthrough, product quality has significantly improved.
In terms of prices, although the current market is still increasing prices, Longyi has accumulated an increase of 3,500 yuan/ton this year, but the actual domestic demand is still not high, and entered the traditional off-season in July and August, Europe and the United States also began holiday peak, foreign exports Or decrease, the expectation of market price increase is getting smaller and smaller, or it will stop "up eight consecutive rise". In the second half of the year, manufacturers are more likely to be war-torn each other, and they will be priced based on actual conditions such as their own inventory. The prices may fall back, but the falling-back space will remain within reasonable prices, appearing to be lower than most manufacturers as last year. The chances of the cost price situation are already small.
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The so-called silicon pump, in fact, refers to aluminum zinc silicon pump. Aluminum zinc silicon pump, refers to the pump impeller, shell, gland and other major components are all corrosion resistant alloy steel - aluminum-zinc-silicon alloy. Al-Zn-Si pump can effectively control the zinc liquid in the pump flow rate, temperature drop, thermal expansion coefficient of the material and other indicators to meet the special requirements of repeated use for a long time, therefore, aluminum zinc-silicon pump by hot galvanized units Welcome and favor. The application of aluminum alloy pump can greatly improve the production efficiency, but also liberate the workers from the heavy manual labor, greatly reducing the labor intensity of the workers, and also avoiding the high temperature and liquid zinc splashing on people's injury, Thus greatly improving the economic benefits of hot-dip galvanizing manufacturers. Aluminum zinc silicon pump is also a feature of the long axis of transmission (usually more than 2 meters), the drive motor away from heat, to ensure that the motor can work for a long time.
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Recently, China has independently developed a 4-inch high-purity semi-insulating silicon carbide substrate products available. It is reported that the silicon carbide project developed by Shandong Tianyue made. China Electronics Materials Industry Association experts believe that the results of the leading domestic and has reached the international advanced level. Earlier, a Beijing enterprise and the Chinese Academy of Sciences, successfully developed from 2 inches to 6 inches of silicon carbide substrate, completed our SiC process from scratch. Nowadays, the second enterprise in our country has also realized mass production of silicon carbide materials, which indicates that the development of silicon carbide materials in our country is gradually becoming mature.
Observer network that informed, Shandong Tianyue is a silicon carbide manufacturing enterprises and Shandong University Materials Research Center. Materials Science and Technology has always been one of the shortcomings restricting the development of China's military industry. In January 2015, Observer Network reported that Beijing Tianke Heda Bluestar Semiconductor Co., Ltd. and CAS successfully developed a 6-inch silicon carbide substrate and formed a With an annual output of 70,000 silicon carbide wafer production lines, the company was once the only silicon carbide semiconductor materials manufacturing enterprises in China. However, the shortcomings of materials science and technology not only reflected in the technology, but also reflected in the production. Although compared to the lower the technical gap, but the observer network learned that Shandong Tianyue new production line will reach an annual output of 40-50 million 4-inch silicon carbide substrate extent, such a huge scale may mean that our country The cost of silicon carbide products is reduced, leaping in output.
As we all know, most of the current semiconductor materials are monocrystalline silicon. For a long time, China's monocrystalline silicon mainly relies on imports. Compared with single crystal silicon, the production and application of silicon carbide material has been very difficult. The world's most developed silicon carbide devices are the United States, Germany, Switzerland, Japan and other countries, but until now the industrial application of silicon carbide is mainly as an abrasive (Emery) to use. ABB Switzerland has once successfully developed a silicon carbide diode, but in 2002, due to process difficulties, the future is unknown, ABB terminated the silicon carbide project, showing the difficulty of research and development.
The important strategic value of semiconductor silicon carbide substrate and chip, making it always the United States Department of Commerce's embargo list, which also makes it difficult for our country to obtain the corresponding products from abroad. China's second enterprise on the 4-inch high-purity semi-insulating silicon carbide substrate product development success, indicating that China's silicon carbide wafer products in the process and production have been able to get rid of dependence on foreign countries, to the autonomous mass production and widespread application.
The physical properties of silicon carbide and silicon are very different. Monocrystalline silicon carbide has many superior physical properties than monocrystalline silicon, such as about 10 times the electric field strength, about 3 times higher thermal conductivity, about 3 times the width of the forbidden band, about twice the saturation drift velocity. In addition, although silicon carbide devices are much more difficult to process than single crystal silicon in specific applications, once the process is solved, the manufacturing process of the silicon carbide devices is short, the volume and weight are small, the anti-oxidation life is long, and the output power is high Will make it an ideal 21st century semiconductor material that is far superior to single crystal silicon. And silicon carbide materials on the energy consumption is very low, according to the annual output of 400,000 silicon carbide wafer substrate plan, only used in the lighting field, the annual energy consumption is equivalent to saving 26 million tons of standard coal, is a The ideal energy-saving materials.
Comparison of properties of single crystal silicon carbide (SIC) and single crystal silicon (SI) materials
Thus, with the rapid development of wireless communication technology, the demand for high power density and fast response speed of hardware systems is becoming more and more urgent. Silicon-based materials-based transistors have unparalleled monocrystalline silicon and gallium arsenide devices in the microwave radio frequency field Advantages for aerospace, microwave communications, electronic warfare, large-capacity information processing applications. Phased array radars for the U.S. military's fourth-generation fighter jets, electronic jammers and Aegis destroyers have begun to refurbish their SiC-based microwave devices. With the enhancement of the production capacity of silicon carbide wafers in China, both domestic fighters and warships will be able to replace the "clairvoyance" with better performance and narrow the gap with the United States in quality and quantity.
In addition to military applications, silicon carbide materials are also in urgent need of civilian semiconductors and power. According to the introduction of Shandong Tianyue official website, this is a private enterprise established in November 2010 to develop and produce semiconductor chips and substrate materials. It is an industrialized base, a high-tech enterprise of Shandong University, a brand building of Shandong Province Demonstration business. In the past, the production of silicon carbide wafers could only meet the needs of military products. The annual output of 400,000 pieces of silicon carbide chips means that silicon carbide wafers are no longer "special" products for military radar electronic equipment and their use may be extended to generate electricity , Power transmission, railway, lighting and other civilian areas, to play a greater role in the development of the national economy.
Domestic silicon carbide materials help domestic radar
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Recently, China has independently developed a 4-inch high-purity semi-insulating silicon carbide substrate products available. It is reported that the silicon carbide project developed by Shandong Tianyue made. China Electronics Materials Industry Association experts believe that the results of the leading domestic and has reached the international advanced level. Earlier, a Beijing enterprise and the Chinese Academy of Sciences, successfully developed from 2 inches to 6 inches of silicon carbide substrate, completed our SiC process from scratch. Nowadays, the second enterprise in our country has also realized mass production of silicon carbide materials, which indicates that the development of silicon carbide materials in our country is gradually becoming mature.
Observer network that informed, Shandong Tianyue is a silicon carbide manufacturing enterprises and Shandong University Materials Research Center. Materials Science and Technology has always been one of the shortcomings restricting the development of China's military industry. In January 2015, Observer Network reported that Beijing Tianke Heda Bluestar Semiconductor Co., Ltd. and CAS successfully developed a 6-inch silicon carbide substrate and formed a With an annual output of 70,000 silicon carbide wafer production lines, the company was once the only silicon carbide semiconductor materials manufacturing enterprises in China. However, the shortcomings of materials science and technology not only reflected in the technology, but also reflected in the production. Although compared to the lower the technical gap, but the observer network learned that Shandong Tianyue new production line will reach an annual output of 40-50 million 4-inch silicon carbide substrate extent, such a huge scale may mean that our country The cost of silicon carbide products is reduced, leaping in output.
As we all know, most of the current semiconductor materials are monocrystalline silicon. For a long time, China's monocrystalline silicon mainly relies on imports. Compared with single crystal silicon, the production and application of silicon carbide material has been very difficult. The world's most developed silicon carbide devices are the United States, Germany, Switzerland, Japan and other countries, but until now the industrial application of silicon carbide is mainly as an abrasive (Emery) to use. ABB Switzerland has once successfully developed a silicon carbide diode, but in 2002, due to process difficulties, the future is unknown, ABB terminated the silicon carbide project, showing the difficulty of research and development.
The important strategic value of semiconductor silicon carbide substrate and chip, making it always the United States Department of Commerce's embargo list, which also makes it difficult for our country to obtain the corresponding products from abroad. China's second enterprise on the 4-inch high-purity semi-insulating silicon carbide substrate product development success, indicating that China's silicon carbide wafer products in the process and production have been able to get rid of dependence on foreign countries, to the autonomous mass production and widespread application.
The physical properties of silicon carbide and silicon are very different. Monocrystalline silicon carbide has many superior physical properties than monocrystalline silicon, such as about 10 times the electric field strength, about 3 times higher thermal conductivity, about 3 times the width of the forbidden band, about twice the saturation drift velocity. In addition, although silicon carbide devices are much more difficult to process than single crystal silicon in specific applications, once the process is solved, the manufacturing process of the silicon carbide devices is short, the volume and weight are small, the anti-oxidation life is long, and the output power is high Will make it an ideal 21st century semiconductor material that is far superior to single crystal silicon. And silicon carbide materials on the energy consumption is very low, according to the annual output of 400,000 silicon carbide wafer substrate plan, only used in the lighting field, the annual energy consumption is equivalent to saving 26 million tons of standard coal, is a The ideal energy-saving materials.
Comparison of properties of single crystal silicon carbide (SIC) and single crystal silicon (SI) materials
Thus, with the rapid development of wireless communication technology, the demand for high power density and fast response speed of hardware systems is becoming more and more urgent. Silicon-based materials-based transistors have unparalleled monocrystalline silicon and gallium arsenide devices in the microwave radio frequency field Advantages for aerospace, microwave communications, electronic warfare, large-capacity information processing applications. Phased array radars for the U.S. military's fourth-generation fighter jets, electronic jammers and Aegis destroyers have begun to refurbish their SiC-based microwave devices. With the enhancement of the production capacity of silicon carbide wafers in China, both domestic fighters and warships will be able to replace the "clairvoyance" with better performance and narrow the gap with the United States in quality and quantity.
In addition to military applications, silicon carbide materials are also in urgent need of civilian semiconductors and power. According to the introduction of Shandong Tianyue official website, this is a private enterprise established in November 2010 to develop and produce semiconductor chips and substrate materials. It is an industrialized base, a high-tech enterprise of Shandong University, a brand building of Shandong Province Demonstration business. In the past, the production of silicon carbide wafers could only meet the needs of military products. The annual output of 400,000 pieces of silicon carbide chips means that silicon carbide wafers are no longer "special" products for military radar electronic equipment and their use may be extended to generate electricity , Power transmission, railway, lighting and other civilian areas, to play a greater role in the development of the national economy.
Domestic silicon carbide materials help domestic radar
Anticorrosion Pigments, Inkjet Receptive Coating, Matting Agent
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CHINACOAT - An Annual Exhibition for The Industry
November 15 - 17, 2023 | Shanghai New International Expo Centre (SNIEC)
November 1 – December 31, 2023 | Online Show (www.chinacoatonline.net)
CHINACOAT2023 will open its gates to global visitors once again since our last show being held there in 2019. The show to be held on November 15-17 at the Shanghai New International Expo Centre (SNIEC) covers 7.5 exhibition halls (Halls E2, E3, E4, E5, E6, E7, E8 and E9), with a total gross exhibition area of more than 70,000 square meters. Over 900 exhibitors from 30 Countries and Regions are going to display their new products, services and solutions. It will be a Global Event not to be missed by any players in our industry. Register to visit now!
CHINACOAT continues to offer an Online Show (www.chinacoatonline.net) this year, providing Exhibitors with extra exposure and connecting with the visitors worldwide to extend the promotional mix.
This year, we have appointed Shanghai PCI&KM, the Coatings Industry technical media service platform, as our Official Video Production Provider. They will visit Exhibitors` Booths onsite at the exhibition hall to shoot videos for you, to introduce your products in interview format, in order to show global visitors real-time footages to increase engagement. The edited videos will be uploaded to our various official channels as well as Shanghai PCI&KM`s official channels, with total of over 123,000 followers, as early as the next day.
Anticorrosion Pigments, Inkjet Receptive Coating, Matting Agent