What are the physical characteristics?
The unit cell has a face-centered cubic structure, and each unit cell contains 4 C atoms and 4 Si atoms. Similar to diamond structure.
Silicon carbide's Mohs hardness is second only to diamond, boron carbide and cubic boron nitride, and it ranks fourth among inorganic materials. At present, high-density silicon carbide can be prepared by hot-pressing sintering. It has high strength and good oxidation resistance, and does not deform at high temperatures. It can be used as a turbine blade on a high temperature gas turbine, and can also be used as a wear-resistant sealing material. Bulletproof supplies.
Emery is also known as pure colorless crystal. Density, hardness is very large, about 9.5 degrees Mohs. Generally, it is colorless powdery particles. After grinding, it can be used as grinding powder, can be used to make polishing paper, and can also be used to make friction surfaces of grinding wheels and vermiculite. Quartz sand and appropriate amount of carbon are placed in an electric furnace to strengthen the heat.
Natural corundum, also known as garnet, is a silicate mineral. Grinding materials made by hydraulic sorting, machining, screening and classification. There is a long history of production and use. In ancient China, there were historical examples of using emery to grind crystal glass and various jade. In the 1840s it was exported to Toyo.