1. What are the differences in the purity of boron nitride?
The production process causes the difference in the different purity of boron nitride. Low-temperature boron nitride is 95%~98%, and high-temperature boron nitride is purity above 99%. For example, synthetic diamond products, cubic boron nitride tools, and low-temperature boron nitride can be used in the industrial field. Use high-temperature boron nitride to use cosmetics and fine electronics, such as lipstick, CPU heat dissipation film, electric heat tube filler, etc. These kinds of products also have a very high requirement on the particle size of boron nitride.
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2. What is the thermal expansion coefficient of boron nitride?
Boron nitride has strong thermal conductivity, low thermal expansion coefficient, small average particle size, corrosion resistance, high-temperature resistance and good insulation. Even at ultra-high temperatures, it still has good lubrication. It can be used as electrolytic and resistance material at high temperatures and as a high-temperature solid lubricant and extrusion anti-wear additive. High thermal conductivity makes boron nitride widely used in the high-temperature field. The expansion coefficient of hexagonal boron nitride is equivalent to quartz, but the thermal conductivity is ten times that of quartz. It also has good lubrication at high temperatures, is an excellent high-temperature solid lubricant, has a strong neutron absorption capacity, stable chemical properties, and is chemically inert for almost all molten metals.
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3. Why does the hexagonal boron nitride not conduct its electricity?
The hexagonal boron nitride contains no ions and is a covalent compound that is less conductive than graphite. Graphite can conduct electrically using an sp2 hybrid mode and a free electron. The hexagonal boron nitride adopts the SP 3 hybrid mode with no free electrons and is not an ionic conductor. Moreover, there are three valence electrons in the outer layer of boron, and there is five nitrogen. After the formation of boron nitride, whether nitrogen or boron, the outermost electrons are fixed by the formation of covalent bonds. They cannot move freely in the whole solid, so the electrical conductivity is poor.
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4. What is the particle size of boron nitride?
Particle size refers to granularity, and per unit of quantity, granularity refers to the size of raw material particles, generally expressed by the maximum length of the particles. The mesh is the size of the standard screen. In the Taylor standard screen, the so-called mesh is the number of sieve holes in 2.54 cm (1 inch) long and is called mesh for short. Although hexagonal boron nitride is powder, it also has particle size; different particle size of hexagonal boron nitride is suitable for different products. If the product selects the correct size of hexagonal boron nitride, and the effect will be improved.
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5. What is the difference between hexagonal and high-temperature boron nitride?
The crystal structures of hexagonal boron nitride and graphite are similar to graphite. Hexagonal boron nitride is also called high-temperature boron nitride, hexagonal boron nitride-H type has good electrical insulation, thermal conductivity, chemical corrosion resistance and lubrication, and has a strong neutron absorption capacity, almost all organic solvents and corrosive chemicals are relatively stable; for almost all molten metals are chemically inert. The hexagonal boron nitride is less than 1000℃ in air, and various physical and chemical properties remain unchanged; the stable temperature remains 3000℃ in nitrogen or argon. The hexagonal boron nitride-H powder becomes white mass, easy to machine, and can withstand temperatures up to 2000℃.
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