The difference between black silicon carbide and green silicon carbide

Silicon carbide is produced two colors: Black silicon carbide and green silicon carbide. What is the difference between these two types of silicon carbide?

Introduction to Black Silicon Carbide and Green Silicon Carbide

There are two widely used main varieties of silicon carbide: green silicon carbide powder and black silicon carbide powder, both of which are α-SiC. Green silicon carbide and black silicon carbide are basically the same, excluding differences in raw materials and manufacturing processes. The product is green and translucent, and its hardness and purity are better, than black silicon carbide. Its elasticity coefficient reaches 410 GPa, and it does not dissolve at normal temperature and pressure. Only then will he be lost, when the temperature rises above 1600°C, and will not decompose until then, until it reaches 2815.5 ° C.

The difference between two types of silicon carbide powder

1. Black silicon carbide contains about 98,5% SiC, and its impact strength is higher, than green silicon carbide. It is mainly used for processing materials with low tensile strength, such as glass, ceramics, stone, fireproof materials, cast iron and non -ferrous metals.
2. Green silicon carbide contains more 99% Sic and has good self -shaping properties. It is mainly used to process carbide materials, titanium alloys and optical glass. It is also used for grinding cylinder liners and precision grinding of high speed steel tools. Besides, there is cubic silicon carbide, which is a yellow-green crystal, obtained in a special way. Abrasive tools, used for its manufacture, Suitable for ultra-finishing machining of bearings and can improve surface roughness from Ra32~ 0,16 μm to Ra0.04 ~ 0,02 µm.
3. Chemical coefficient of green silicon carbide: Due to its stable chemical properties, high thermal conductivity, low coefficient of thermal expansion and good wear resistance, in addition to being used as an abrasive, it has many other uses; it is used to make modern refractory materials, resistant to thermal shock. , small size, easy, Highly durable and with good energy-saving effect.
4. . Green silicon carbide is suitable for copper grinding, brass, aluminum, precious stones, optical glass, ceramics and other hard alloys, metals, as well as hard and brittle non-metallic materials. Its micro powder can also be used as ceramic materials. Due to its high purity, black silicon carbide is also widely used in the production of refractory materials and various abrasive tools..
5. Black silicon carbide is made from quartz sand, petroleum coke and high quality silica as main raw materials and melted at high temperature in resistance furnace. Its hardness is between corundum and diamond, Its mechanical strength is higher, than Corunda, And he is fragile and sharp.