Black silicon carbide and green silicon carbide have different purities and uses. Here is a detailed introduction to the following points:
1. Black silicon carbide contains about 98.5% SiC. Black silicon carbide has higher toughness than green silicon carbide and is mostly used to process materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals. Green silicon carbide contains more than 99% SiC and has good self-sharpening properties. It is mostly used to process cemented carbide, titanium alloy and optical glass, and is also used for honing cylinder liners and fine grinding of high-speed steel tools.
2. In addition, there is a special variety of silicon carbide, which is cubic silicon carbide, a specially made yellow-green crystal, which is mostly used in the finishing industry, such as the processing of bearings, and has good micro-machining effects.
Silicon carbide has many other uses besides abrasives due to its stable chemical properties, high thermal conductivity, low thermal expansion coefficient and good wear resistance. For example, by using a special process to apply silicon carbide powder to the inner wall of the turbine impeller or cylinder body, it can improve its wear resistance and extend its service life by 1 to 2 times; the high-grade refractory material made from it is resistant to thermal shock, small in size, light in weight, high in strength, and has good energy-saving effect.
Silicon carbide has great hardness, excellent thermal conductivity, is a semiconductor, and can resist oxidation at high temperatures.
