Differences between black silicon carbide and green silicon carbide

The main differences between black silicon carbide and green silicon carbide are chemical composition, hardness, purity, and application fields.

1. Chemical composition and purity: Black silicon carbide, whose chemical formula is SiC, contains about 95% to 98.5% SiC, while green silicon carbide usually contains more than 97% SiC, and some information suggests that it can be more than 99%. This indicates that the purity of green silicon carbide is higher than that of black silicon carbide.

2. Hardness and mechanical strength: The hardness of green silicon carbide is between that of corundum and diamond, and its mechanical strength is higher than that of corundum, while the hardness of black silicon carbide is also between that of corundum and diamond, and its mechanical strength is higher than that of corundum. However, the toughness of black silicon carbide is higher than that of green silicon carbide, and black silicon carbide has an advantage when processing with certain materials.

3. Application areas: Due to its toughness and hardness characteristics, black silicon carbide is mainly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractories, cast iron, and non-ferrous metals. Meanwhile, green carbide has high purity and self-polishing properties, so it is suitable for processing hard materials such as cemented carbide, titanium alloy, and optical glass. In addition, green carbide can also be used for honing cylinder liners and precision grinding of high-speed steel cutting tools.

4. Raw material production: The two are also different in the production of raw materials. The main raw materials of black silicon carbide are quartz sand, petroleum coke and silica, while green silicon carbide is made of petroleum coke and high-quality silica as the main raw materials, and table salt is added as an additive in the smelting process.