Properties of boron nitride


There are two types of BN materials in boron nitride (BN) ceramics: hexagonal and cubic structures. The hexagonal boron nitride crystal structure has a similar graphite layered structure, presenting a loose, lubricating, easily hygroscopic, lightweight white powder, also known as "white graphite.". Theoretical density: 2.27g/cm3; The Mohs hardness is 2. Hexagonal boron nitride has excellent electrical insulation, thermal conductivity, and chemical stability; No obvious melting point, and sublimation at 3000 in 0. IMPa nitrogen, melting point at 3000 in inert gas, heat resistance to 2000 in neutral reducing atmosphere, use temperature up to 2800 in nitrogen and argon, poor stability in an oxygen atmosphere, use temperature below 1000 . Hexagonal boron nitride is insoluble in cold water and hydrolyzes very slowly when boiled, producing small amounts of boric acid and ammonia; It does not react with weak acids or strong bases at room temperature and is slightly soluble in hot acids. It can be decomposed only after being treated with molten sodium hydroxide or potassium hydroxide. The expansion coefficient of hexagonal boron nitride is equivalent to that of quartz, but its thermal conductivity is ten times that of quartz. BN is both a good conductor of heat and an insulator of electricity. Its breakdown voltage is 4-5 times alumina's, and its dielectric constant is 1/2 that of alumina. BN exhibits stable performance under ultra-high pressure and is the lightest ceramic material. Cubic BN has a sphalerite structure, high chemical stability, good thermal conductivity, and heat resistance, and its hardness is similar to that of synthetic diamonds. It is an excellent abrasive material. Compared to diamond, its most prominent advantage is that it does not react with ferrous metals at high temperatures and can be used at 1400 . If you are looking for high quality, high purity and cost-effective copper oxide, or if you require the latest price of copper oxide, please feel free to email contact mis-asia.

Inquiry us

Our Latest Products

Factory 3-5nm Nanodiamond Powder CAS 7782-40-3

Brief Introduction of Nanodiamond PowderProduct name: Nanodiamond PowderFormular: C Product NameNanodiamond PowderPurity 99%Particle Size3-5nmAnalysis ResultChemical CompositionAnalysis (%)Al0.0046%Co0.007%Si0.079%Na0.002%K0.00015%Ca0.003%Mg0.00058%...…

CAS No. 557-05-1 40% Water-based Zinc Stearate Zinc Stearate Emulsion

Product DescriptionProduct Description Description of zinc stearate emulsionZinc stearate emulsion is easy to disperse in water, has ultra-fineness, good dispersion compatibility. Zinc stearate emulsion has the characteristics of lubricating and deli...…

China factory cheapest price lightweight concrete wall panel making machine large hydraulic cement foaming machine equipment

Product performance of TR-40 Cement Foaming Machine1. The shell is made of high-strength precision thickened steel plate, painted twice, which is durable.2. The slurry output is uniform and stable, the density of the foam concrete finished product i...…

0086-0379-64280201 skype whatsapp