Silicon Carbide

Product
Description

Silicon carbide is a man-made material manufactured through heating silica sand and carbon to high temperatures in the Acheson furnace technique. Silicon carbide is an extremely hard material (Mohs hardness 9.25), is chemically inert and does not melt. Silicon Carbide has a high thermal conductivity, a low coefficient of thermal expansion, is thermal shock and abrasion resistant and has strength at high temperatures. Silicon carbide's varied properties make it an effective material in many different applications.

Silicon carbide contains two common basic varieties: black silicon carbide and green silicon carbide. Black silicon carbide contains sic about 95%, so the toughness is higher than green silicon carbide. It is widely used for processing low tensile strength material like glass, ceramics, stone, refractory material, cast iron and nonferrous metal etc. Green silicon carbide contains sic about 97% above with good self-sharpening, so it is used for processing hard alloy, titanium alloy and optical glass as well as cylinder jacket and fine grinding cutting tools.

Silicon carbide has good hardness only second to the hardest diamond, hardness is 9.5. Due to good thermal conductivity, silicon carbide is a kind of semiconductor and can oxidation resistance in high temperature. Silicon carbide has wide applications because of stable chemical performance, high thermal conductivity, small thermal expansion coefficient, good wear-resisting performance. Low grade silicon carbide about 85% is an excellent deoxidizer, which can speed up steel making and facilitate the control of chemical composition to improve the steel quality. Therefore, the market price of silicon carbide is still stable.

APPLICATION

1. Abrasives - mainly because silicon carbide has high hardness, chemical stability and certain toughness, so silicon carbide can be used to manufacture bonded abrasives, coated abrasives and free grinding to process glass and ceramics, stone , cast iron and some non-ferrous metals, cemented carbide, titanium alloys, high-speed steel tools and grinding wheels

2. Refractory and corrosion-resistant materials - mainly because silicon carbide has a high melting point (decomposition degree), chemical inertness and thermal vibration resistance, so silicon carbide can be used for abrasive tools and ceramic products firing furnaces. Shelves and saggers, silicon carbide bricks for vertical cylindrical distillation furnaces in zinc smelting industry, linings of aluminum electrolytic cells, crucibles, small charge and other silicon carbide ceramic products.

3. Chemical use - Because silicon carbide can decompose in molten steel, it reacts with oxygen and metal oxides in molten steel to generate carbon monoxide and silicon-containing slag. Therefore, silicon carbide can be used as a purifying agent for smelting iron and steel, that is, as a deoxidizer for steelmaking and a structure improver for cast iron. This usually uses low-purity silicon carbide to keep costs down. At the same time, silicon carbide can also be used as a raw material for the manufacture of silicon tetrachloride.

4. Electrical use - Silicon carbide can be used as heating element, nonlinear resistance element and high semiconductor material. Heating elements such as silicon carbide rods (suitable for various electric furnaces at 1100-1500°C), nonlinear resistance elements, and various arrester valves.

5. Silicon carbide is formulated into far-infrared radiation coating or far-infrared radiation desiccant for silicon carbide and silicon wafers.

Product
Specification

Model	Chemical Composition
Model	SiC	Free Carbon	Fe2O3
SiC 98.5	98.5Min	0.2Max	0.60Max
SiC 97	97.0Min	0.3Max	1.2Max
SiC 95	95.0Min	0.6Max	1.2Max
SiC 90	90.0Min	1.0Max	1.2Max
SiC 88	88.0Min	4.0Max	1.5Max
Model No.	SiC	Al2O3	Fe2O3
SiC Briquette 70	70.0Min	5.0Max	3.0Max
SiC Briquette 65	65.0Min	5.0Max	3.0Max

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