Casting Brilliance: Fused Alumina Applications in Foundry Industries
Silicon carbide (SiC) is made of quartz sand, petroleum coke (or coal coke), wood chips, and other raw materials by a high-temperature smelting resistance furnace. In the contemporary C, N, B and other non-oxide high-tech refractory materials, silicon carbide is the most widely used, the most economic one, and can be called gold steel sand or refractory sand. At present, China's industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide.
Main ingredients:
The main chemical composition of silicon carbide is SiC, green silicon carbide contains more than 97% SiC, black silicon carbide contains more than 95% SiC.
Black silicon carbide is named black silicon carbide because of its black color. Green silicon carbide is named green silicon carbide because of its green color. Black silicon carbide is made of petroleum coke, quartz sand, wood chips, and other raw materials in the resistance furnace smelting. Green silicon carbide in the production of raw materials and black silicon carbide production are roughly the same, as other industrial salt reaction agents and promoters in the resistance furnace reaction.
Compared with corundum abrasive, black silicon carbide texture than corundum abrasive brittle, hard hardness, its toughness is also inferior to corundum abrasive. For tensile strength of the base material, such as non-metallic materials (all kinds of sheets such as wood plywood, particle board, 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, is especially suitable for processing of hard and brittle materials is also ideal abrasive.
The texture of green silicon carbide grit is purer than black silicon carbide, hardness is higher than black silicon carbide, its grinding use and black silicon carbide is the same, more suitable for fine grinding materials such as grinding thread, grinding tools, etc., in the grinding material are more widely used in hard alloy, diamond products of the workpiece.
Because the cost of green silicon carbide in production is higher than that of black silicon carbide, such as the use of raw materials on the ratio is not the same, plus salt auxiliary materials and power consumption and processing process differences, so the price of green silicon carbide products is higher than that of black silicon carbide. Therefore, compared with black silicon carbide, generally do not choose green silicon carbide in non-metallic and non-ferrous metal materials, and mainly choose green silicon carbide as hard alloy and precision grinding, in the sand belt and other coated abrasives choose green silicon carbide as grinding material is less.
Green Silicon Carbide is generally more expensive due to its higher purity levels, which often exceed 99%. This high purity makes it ideal for specialized applications in electronics, advanced ceramics, and high-precision abrasives, where even minor impurities can significantly impact performance. Many green silicon carbide suppliers' production process is also more complex and energy-intensive, contributing to its higher cost.
On the other hand, Black Silicon Carbide is more cost-effective and widely used in general-purpose applications. It contains more impurities compared to its green counterpart, making it less suitable for applications requiring extreme purity but perfectly adequate for tasks like grinding, cutting, and polishing. The simpler production process and lower energy requirements for Black Silicon Carbide further reduce its cost, making it a more economical choice for many industrial applications.
