Raw materials and production process:
Green silicon carbide: mainly petroleum coke and high-quality silica as the main raw materials, adding salt as an additive, and smelting through high temperature in a resistance furnace.
The addition of salt promotes the crystallization process of silicon carbide and improves the purity and crystal quality of the product.
Black silicon carbide: quartz sand, petroleum coke and high-quality silica as the main raw materials, smelting through high temperature in a resistance furnace, without the addition of salt.
Physical and chemical properties:
Green silicon carbide:
The crystal has high purity and high hardness. Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it has good high temperature resistance and chemical stability.
Black silicon carbide: Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, it is brittle and sharp, has high thermal conductivity, and good oxidation resistance and radiation resistance.
Application fields:
Green silicon carbide: Due to its high purity, high hardness and excellent mechanical properties, it is widely used in precision grinding and crystal wire cutting of materials such as cemented carbide, titanium alloy, optical glass, etc. In addition, it is also used to manufacture advanced refractory materials, abrasive tools, etc.
Black silicon carbide: Mostly used to process materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals. In addition, it is also used in the manufacture of refractory materials and various abrasive tools.
In summary, there are significant differences between green silicon carbide and black silicon carbide in terms of raw materials, production processes, physical and chemical properties, and application fields. These differences determine their selection and use in different industrial applications.
