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Major Uses Of Silicon Carbide

Date: Feb 22nd, 2024
Black silicon carbide is made from quartz sand and petroleum coke silica as main raw materials through high-temperature smelting in a resistance furnace. Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it is brittle and sharp. Green silicon carbide is made from petroleum coke and silica as the main raw materials, with salt added as an additive, and smelted at high temperature in a resistance furnace. Its hardness is between corundum and diamond, and its mechanical strength is higher than corundum.


So what are the main uses of silicon carbide?
1. Abrasives - Mainly because silicon carbide has high hardness, chemical stability and certain toughness, 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, carbide, titanium alloy, high-speed steel cutting tools and grinding wheels, etc.

2. Refractory materials and corrosion-resistant materials---Mainly because silicon carbide has a high melting point (degree of decomposition), chemical inertness and thermal shock resistance, silicon carbide can be used in abrasives and ceramic product firing kilns. Shed plates and saggers, silicon carbide bricks for vertical cylinder distillation furnaces in zinc smelting industry, aluminum electrolytic cell linings, crucibles, small furnace materials and other silicon carbide ceramic products.

3. Chemical uses-because silicon carbide can decompose in molten steel and react with oxygen and metal oxides in the molten steel to generate carbon monoxide and silicon-containing slag. Therefore, it can be used as a purifying agent for smelting steel, that is, as a deoxidizer and cast iron structure improver for steel making. This generally uses low purity silicon carbide to reduce costs. It can also be used as a raw material for manufacturing silicon tetrachloride.

4. Electrical applications - used as heating elements, non-linear resistance elements and high semiconductor materials. Heating elements such as silicon carbon rods (suitable for various electric furnaces operating at 1100 to 1500°C), non-linear resistor elements, and various lightning protection valves.