Why is the high thermal conductivity and wear resistance of black silicon carbide so good?

Black silicon carbide is mainly made from quartz sand, petroleum coke, and high-quality silica as raw materials, and is smelted at high temperatures in a resistance furnace. Its hardness is between that of corundum and diamond, and its mechanical strength is higher than that of corundum. It is brittle and sharp.

Silicon carbide, due to its stable chemical properties, high thermal conductivity, low thermal expansion coefficient, and good wear resistance, has many other uses besides being used as an abrasive. For example, by applying silicon carbide powder to the inner wall of a turbine impeller or cylinder block through special processes, its wear resistance can be improved and its service life can be extended by 1-2 times; Made of advanced refractory materials, it is heat-resistant, shock resistant, small in size, lightweight, and has high strength, with good energy-saving effects. Low grade silicon carbide (containing about 85% SiC) is a good deoxidizer, which can accelerate steelmaking speed, facilitate chemical composition control, and improve steel quality. In addition, silicon carbide is also widely used to make silicon carbide rods for electric heating elements.