Corundum, silicon carbide and brown corundum are all materials with high hardness, which are widely used in various industries such as abrasives, grinding tools, ceramic manufacturing, and electronic equipment. However, due to the different chemical properties and components of the three, there are still differences between the three. This article will analyze the three from the aspects of raw materials, uses, and properties.
Different raw materials:
Brown corundum: Alumina, carbon materials and iron filings are melted and reduced in an electric arc furnace to make brown synthetic corundum. The main chemical component is aluminum oxide (Al2O3), with a content of 95.00%~97.00%, containing trace elements such as iron, silicon, and titanium.
Corundum (corundum): The product of the fusion of quartz and carbon-containing materials (mainly quartz sand and coke). The molecular formula of pure corundum is SiC (Si 70.4%, C 29.6%).
Silicon carbide: Due to the scarcity of silicon carbide reserves in nature, it is mainly produced by artificial synthesis. The commonly used synthesis method is to mix quartz sand with coke, use silica and petroleum coke, add salt and sawdust, put it in an electric furnace and heat it to about 2000°C, and obtain silicon carbide powder through various chemical reactions.
Different applications:
Brown corundum is used to make ceramic and resin bond abrasives, and can also be used for grinding, polishing, sandblasting and precision casting. In addition, it is also used to make precision refractory materials.
Carborundum is suitable for grinding high carbon steel, high-speed steel, stainless steel, etc., and white corundum can also be used for precision casting, advanced refractory materials, etc.
Silicon carbide has four major application areas: functional ceramics, advanced refractory materials, abrasives, and metallurgical raw materials.
Different properties:
Brown corundum has the characteristics of high purity, good crystallinity, strong fluidity, small linear expansion coefficient, and corrosion resistance. It is widely used on the surface of hardware parts such as stainless steel, carbon steel, and aluminum alloy to effectively remove burrs and flash.
Compared with brown corundum, corundum has high purity, good self-sharpening, acid and alkali corrosion resistance, high temperature resistance, stable thermal performance, higher hardness than brown corundum, strong cutting force, suitable for removing burrs and flash on metal or non-metal surfaces, and can play a polishing role during grinding. It belongs to medium polishing abrasive.
The above are the main differences between brown corundum, silicon carbide and corundum. The specific choice should be determined according to the specific requirements of the industry.
