Use of silicon carbide

1, abrasive - mainly because silicon carbide has high hardness, chemical stability and a certain toughness, so silicon carbide can be used to manufacture cemented abrasives, coated abrasives and free grinding, so as to process glass, ceramics, stone, cast iron and some non-ferrous metals, cemented carbide, titanium alloy, high-speed steel tools and grinding wheels. Green silicon carbide has high hardness and toughness; It is widely used for grinding optical glass, cemented carbide, titanium alloy and bearing steel grinding and polishing, and high-speed steel cutting tools. Black silicon carbide is mostly used for cutting and grinding materials with low resistance, such as; Non-ferrous metals, grey cast iron workpieces, glass, ceramics, stone and refractory products; Micro-powder abrasives are specially used for ultra-fine grinding of bearings, which is characterized by high grinding efficiency and precision.

2, refractory materials and corrosion resistant materials - mainly because silicon carbide has a high melting point (decomposition temperature), chemical inertia and thermal vibration resistance, so silicon carbide can be used for grinding tools, ceramic products fired into the kiln with the shed and saggar, zinc smelting industrial vertical cylinder distillation furnace with silicon carbide bricks, aluminum electrolytic tank lining, crucible, small pieces of furnace materials and other silicon carbide ceramic products. Silicon carbide has good thermal shock resistance, so it is a high-quality refractory material, according to the production process of different products can be divided into recrystallized silicon carbide, products, high temperature hot pressing products, silicon nitride or clay as a binder products, etc., the main products and uses are; High-temperature furnace components, supporting parts, such as saggar lining plates, etc. are used in electric furnaces for heating furnace bottoms, heat exchangers, thermocouple bushings, etc.; The blast furnace is used for iron trough, hot metal ladle lining or silicon carbide refractory brick, etc. The coke plant uses silicon carbide material to line hot coke flow trough, masonry carbonization chamber furnace bottom, etc.

3, metallurgical industry and chemical industry: In the contemporary C, N, B and other non-oxide high-tech refractory raw materials, silicon carbide is the most widely used and the most economical one. Because silicon carbide can be decomposed in molten steel and react with free oxygen and metal oxides in molten steel to produce carbon monoxide and silicon-containing slag. Therefore, it can be used as a purifying agent for smelting steel, that is, as a deoxidizer for steelmaking and a cast iron tissue improver; Used in various smelting refractory lining, steelmaking deoxidizer, cast iron structure improvement; Compared with coke, silicon powder and other traditional steelmaking deoxidizer effect is better, can improve the quality of steel; Electrical industry: mainly used in electric heating components of high temperature semiconductor materials, far infrared plate, arrester valve plate materials. The chemical industry uses the stability of silicon carbide to make a variety of chemical pipes, valves, etc. The silicon carbide powder is applied to the steam (water) turbine impeller by electroplating method, which can greatly improve the wear resistance of the impeller. Because silicon carbide has excellent high temperature strength and oxidation resistance, it has become the main raw material for high temperature non-oxide ceramics. Low purity silicon carbide is generally used to reduce costs. It can also be used as a raw material for the manufacture of silicon tetrachloride.