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New progress in the application of silicon carbide

2018-12-14
Silicon carbide (SiC) is produced by high-temperature smelting of electric furnaces such as quartz sand, petroleum coke , and wood chips . Among the non-oxide high-tech refractory raw materials such as C, N and B, silicon carbide is the most widely used and economical one, and it can be called gold steel sand or refractory sand.
 
SiC materials due to their high modulus of elasticity, moderate density, low coefficient of thermal expansion, high thermal conductivity, thermal shock resistance, high specific stiffness, high dimensional stability, and thermal and mechanical properties A series of excellent physical properties such as isotropicity have received more and more attention. They are widely used in ceramic ball bearings, valves, semiconductor materials, gyros, measuring instruments, aerospace and other fields, and have become a kind of industry. Alternative materials.
 
There are four main application areas for SiC: functional ceramics, advanced refractory materials, abrasives and metallurgical raw materials. High-purity silicon carbide single crystal, which can be used in the manufacture of semiconductors and in the manufacture of silicon carbide fibers. As SiC production costs decrease, SiC semiconductors are gradually replacing Si, and the days of concern for the bottleneck encountered by Si will end.

Advantages of SiC materials in the field of application:
(1) SiC materials are used in the field of high-speed rail, which can save more than 20% energy and reduce the volume of power system;
(2) SiC materials can be used in new energy vehicles to reduce energy consumption by 20%;
(3) SiC materials can be used in the field of home appliances, saving 50%;
(4) SiC materials are used in the field of wind power generation, which can increase efficiency by 20%;
(5) SiC materials are used in the field of solar energy, which can reduce the photoelectric conversion loss by more than 25%;
(6) SiC materials are used in the field of industrial motors, which can save energy by 30% to 50%;
(7) SiC materials are used in the field of ultra-high voltage DC power transmission and smart grid, which can reduce power loss by 60% and increase power supply efficiency by more than 40%;
(8) SiC materials are used in the field of big data to help significantly reduce energy consumption in data centers;
(9) SiC materials are used in the field of communications, which can significantly improve signal transmission efficiency and transmission security and stability;
(10) The application of SiC materials in the aerospace industry can reduce the loss of equipment by 30% to 50%, increase the operating frequency by 3 times, reduce the capacitance and capacitance by 3 times, and greatly reduce the weight of the radiator.
 
However, due to the fragile SiC material, the preparation is relatively difficult, and the production of large-size SiC has always been a problem. Therefore, how to produce a large-sized SiC substrate to reduce the cost has been a technical breakthrough.