How much do you know about the basic knowledge of silicon hexaboride？
Overview of silicon hexaboride
The chemical formula of silicon hexaboride is SiB6, which is a shiny black-gray powder with a relative density of 3.0g/cm3 and a melting point of 2200°C. Silicon hexaboride is insoluble in water, resistant to oxidation, thermal shock, and chemical attack, especially with high strength and stability under thermal shock.
Its cutting efficiency is higher than that of boron carbide. It can be used as various standard abrasives and grinding cemented carbides. It is also used as engineering ceramic materials, sandblasting nozzles, blades of gas engines, and other special-shaped sintered parts and seals. Used as an anti-oxidant for refractory materials.
The properties and stability of silicon hexaboride
It will not decompose if used and stored according to specifications. The hardness is between diamond and ruby. Can conduct electricity. Insoluble in water. When heated in chlorine and water vapor, the surface can be oxidized. It can be directly oxidized in boiling nitric acid. It does not change in molten potassium hydroxide. It decomposes in hot concentrated sulfuric acid.
A synthesis method of silicon hexaboride
It can be obtained by directly heating a mixture of boron and silicon, using HF and HNO3 to remove excess silicon, and then using molten KOH to decompose the B3Si in the mixture.
Harmfulness and storage method of silicon hexaboride
Silicon hexaboride is generally not harmful to water. Do not discharge the material into the surrounding environment without government permission. The storage of silicon hexaboride needs to be sealed in a cool and dry place.
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