Silicon carbide is made from petroleum coke and quartz sand or coal tar, wood chips, and other raw materials by smelting high-temperature electric resistance furnaces. In the high technology, non-oxide refractory raw materials, such as C, N, B, silicon carbide is the most widely used and one of the most economical material. It can be called corundum or refractory sand. In China, there are two kinds of silicon carbide: Green Silicon Carbide and Black Silicon Carbide.
Main Chemical Composition
The main chemical composition of Silicon carbide is SiC. Green silicon carbide containing SiC more than 97%, black silicon carbide containing SiC more than 95%.
Colour
Black silicon carbide is black, so named black silicon carbide.
Green silicon carbide is green, so named green silicon carbide.
Smelting
Black silicon carbide is made from petroleum coke, quartz sand, sawdust by smelting in the resistance furnace. Raw materials of green silicon carbide are similar to black silicon carbide production, the other processing salt as reaction agent and accelerator in the resistance furnace.
Texture and Application
Compared with corundum abrasives, black silicon carbide is crisper and harder. Its toughness is inferior to corundum abrasives.
For tensile strength of the base material, such as non-metallic materials (all kinds of the sheet such as wood plywood, particleboard, including density fiberboard, bamboo board, calcium silicate board, leather, glass, ceramic, stone, etc.) and non-ferrous metals (aluminum, copper, lead, etc.) and other materials processing, black silicon carbide is especially suitable. For the processing of hard and brittle materials, it is also an ideal abrasive.
Green silicon carbide purer and more challenging than black silicon carbide. The grinding usage of green silicon carbide is the same as black silicon carbide. And the green silicon carbide is more suitable for fine grinding materials, such as thread, grinding measuring tools in a broader range of grinding material artifacts for hard alloy, diamond products.
With black silicon carbide, green silicon carbide uses different raw material ratios, auxiliary salt materials, power consumption, and processing. Because the green silicon carbide in the production cost is higher than the black silicon carbide, so the green silicon carbide products are sold at a higher price than the black silicon carbide.
Compared with black silicon carbide, in terms of nonmetal and non-ferrous metal materials，it is generally not chosen green silicon carbide. It determines green silicon carbide use in the primary grinding hard alloy precision grinding. As grinding material, green silicon carbide is less used in the abrasive belt and other coated abrasive.