Briefly introduce the difference between green silicon carbide and black silicon carbide : silicon carbide has two commonly used basic varieties, black silicon carbide and green silicon carbide, both of which belong to α-SiC. Green silicon carbide is basically the same as black silicon carbide, but the raw materials and manufacturing process are different. The product is green and translucent, and its hardness and purity are better than black silicon carbide.
Silicon carbide has two commonly used basic varieties, black silicon carbide and green silicon carbide, both of which belong to α-SiC. Green silicon carbide is basically the same as black silicon carbide, but the raw materials and manufacturing process are different. The product is green and translucent, and its hardness and purity are better than black silicon carbide. Its elastic modulus reaches 410GPa, and it will not dissolve under normal temperature and pressure.
It will be worn out when the temperature reaches above 1600°C, and it will decompose when it reaches 2815.5°C. ① Black silicon carbide contains about 98.5% 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. ②Green silicon carbide contains more than 99% SiC and has good self-sharpening properties.
It is mostly used for processing hard alloys, titanium alloys and optical glass, and is also used for honing cylinder liners and fine grinding high-speed steel tools. In addition, there is cubic silicon carbide, which is a yellow-green crystal produced by a special process. The abrasive tools used to make it are suitable for superfinishing of bearings.
The surface roughness can be processed from Ra32-0.16 micron to Ra0.04- 0.02 microns. Green silicon carbide chemical coefficient: Due to its stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance, it has many other uses besides being used as an abrasive, such as: coating silicon carbide powder on the impeller of a water turbine with a special process Or the inner wall of the cylinder block can improve its wear resistance and prolong the service life by 1 to 2 times; the high-grade refractory material used to make it is resistant to thermal shock, small in size, light in weight and high in strength, and has good energy-saving effect. Low-grade silicon carbide (containing about 85% SiC) is an excellent deoxidizer, which can speed up steelmaking, facilitate the control of chemical composition, and improve the quality of steel. In addition, silicon carbide is also widely used in the production of silicon carbon for electric heating elements Great.
Green silicon carbide is suitable for grinding copper, brass, aluminum, precious stones, optical glass, ceramics and other hard alloys, metals and hard and brittle non-metallic materials. Its fine powder can also be used as ceramic material. Due to the high purity of black silicon carbide, it is also widely used in the manufacture of refractory materials and various abrasive tools.
Black silicon carbide is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, and is smelted through high-temperature resistance furnace. Its hardness is between corundum and diamond, its mechanical strength is higher than that of corundum, and it is brittle and sharp.
