Black silicon carbide
It is black, brittle and sharp, and has good thermal and electrical conductivity.The microscopic shape is hexagonal crystal, the Mohs hardness of silicon carbide is 9.2, the Microdense hardness of Vickers is 3000–3300kg/mm2, the hardness of Knoop is 2670–2815kg/mm, and the microhardness is 3300kg/mm3.Higher than corundum in abrasives and second only to diamond, cubic boron nitride and boron carbide.
The density is generally considered to be 3.20g/mm3, and the natural bulk density of its silicon carbide abrasive is between 1.2–1.6g/mm3, and the specific gravity is 3.20~3.25.Black silicon carbide is made of petroleum coke and high-quality silica as the main raw materials, adding salt as additives, and smelting at high temperature through a resistance furnace.Compared with green silicon carbide, black silicon carbide has slightly lower purity, hardness and brittleness.
Main uses:Cutting and grinding of solar silicon wafers, semiconductor silicon wafers and quartz chips; Manufacture of consolidated and coated abrasives; grinding and polishing of stone; Processing of metal and non-metallic materials with low tensile strength, such as gray cast iron, brass, aluminum, stone, leather, refractory industry, etc.
