On The Use Of Boron Nitride Properties
Dec 10, 2022
Boron nitride (BN) ceramics have two BN materials with hexagonal and cubic structures. Among them, the crystal structure of hexagonal boron nitride has a similar graphite layered structure, and it is a white powder with loose, lubricated, moisture-absorbing, light weight properties, so it is also called "white graphite". The theoretical density is 2. 27g/cm3; the Mohs hardness is 2. Hexagonal boron nitride has good electrical insulation, thermal conductivity, and chemical stability; it has no obvious melting point, sublimates at 3000 ° C in 0. IMPa nitrogen, and has a melting point of 3000 ° C in inert gas. Heat up to 2000°C, use temperature up to 2800°C in nitrogen and argon, poor stability in oxygen atmosphere, use temperature below 1000°C. Hexagonal boron nitride is insoluble in cold water. When water is boiled, it hydrolyzes very slowly and produces a small amount of boric acid and ammonia; it does not react with weak acids and strong bases at room temperature, and is slightly soluble in hot acids. It can be treated with molten sodium hydroxide and potassium hydroxide. to decompose. The coefficient of expansion of hexagonal boron nitride is equivalent to that of quartz, but the thermal conductivity is 10 times that of quartz. BN is not only a good conductor of heat, but also an electrical insulator. Its breakdown voltage is 4 to 5 times that of alumina, and its dielectric constant is 1/2 of that of alumina. BN has stable performance under ultra-high pressure, and BN is the lightest ceramic material. Cubic BN has sphalerite structure, high chemical stability, good thermal conductivity and heat resistance, and its hardness is similar to that of artificial diamond, so it is an excellent abrasive material. Compared with diamond, its most prominent advantage is that it does not react with iron-based metals at high temperatures, and it can be used at a temperature of 1400°C.
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Uses
Hexagonal boron nitride has a layered crystal structure similar to graphite, and has good lubricity and thermal conductivity. At the same time, hexagonal boron nitride is also a raw material for the synthesis of cubic boron nitride. Cubic boron nitride has excellent physical and chemical properties, and its hardness is second only to diamond. Cubic boron nitride is mainly used as high-grade refractory materials, superhard wear-resistant materials, and superhard materials processed by boron nitride can be made into high-speed cutting tools and drill bits for geological exploration and oil drilling. Since cubic boron nitride also has high thermal conductivity and good semiconductor properties, it is also a semiconductor material with a high temperature, and is widely used in the fields of optoelectronics and microelectronics. In addition, boron nitride can be used to manufacture TiB2/BN composite ceramics, release agent for metal forming, lubricant for metal wire drawing and high-temperature coatings, as a heat-enhancing additive and high-temperature-resistant insulating material in the case of anti-corrosion of molten metal. Used as semiconductor silicon doping source. In aviation and other industries, it can be used as heat shielding materials in aerospace, structural materials for atomic reactors, insulators for high-voltage high-frequency electricity and plasma arcs.
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storage methods
Pack in a polyethylene plastic bag. It should be stored in a well-ventilated dry warehouse to prevent moisture. It should be packed in a wooden box during transportation to avoid damage from moisture.
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