silicon carbide (SiC)

What is silicon carbide? What are the classifications of silicon carbide? What are the uses of silicon carbide? Silicon carbide manufacturers come to answer one by one.

Introduction to Silicon Carbide:

Silicon carbide (SiC) is made by high temperature smelting in a resistance furnace with raw materials such as quartz sand, petroleum coke (or coal coke), and wood chips (salt is needed to produce green silicon carbide). Silicon carbide also exists in nature, a rare mineral, moissanite. Silicon carbide is also called moissanite. Among the non-oxide high-tech refractory raw materials such as C, N, and B, silicon carbide is the most widely used and most economical one, which can be called gold steel grit or refractory sand. At present, China's industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide, both of which are hexagonal crystals with a specific gravity of 3.20 to 3.25 and a microhardness of 2840 to 3320 kg/mm2.

Silicon carbide classification:

There are two basic types of silicon carbide, black silicon carbide and green silicon carbide, both of which belong to α-SiC.

1. Black silicon carbide contains about 95% SiC, and its toughness is higher than that of green silicon carbide. It is mostly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.

2. Green silicon carbide contains more than 97% SiC and has good self-sharpening properties. It is mostly used for processing cemented carbide, titanium alloy and optical glass, as well as for honing cylinder liners and fine grinding high-speed steel tools. In addition, there is cubic silicon carbide, which is a yellow-green crystal prepared by a special process. The abrasive tool used for making is suitable for super finishing of bearings. The surface roughness can be processed from Ra32～0.16 microns to Ra0.04～ 0.02 microns.