What is boron-nitride?
Boron Nitride crystal is part of the hexagonal crystal systems. Its structure and properties are similar to graphite.
Characteristics of Boron Nitride
It is excellent at resisting heat, thermal stability and thermal conductivity. This makes it an ideal heat dissipation and high-temperature insulating material. Boron Nitride is chemically stable, and it is resistant to corrosion from most molten metallics. It is also very self-lubricating. Boron nitride products can be machined up to 1/100mm accuracy and have a low hardness.
Boron nitride can also be used to make crucibles that melt semiconductors, high temperature containers for metallurgy and semiconductor heat-dissipating parts insulation parts, high temperatures bearings, thermowells, and glass forming moulds.
Typically, boron Nitride is obtained in graphite-type structures, commonly called white graphite. Another type is called diamond type. Like the conversion of graphite into a diamond, graphite type boron is also possible to be made into diamond-type Boron Nitride at high temperatures (1800C) or high pressure (800Mpa). The boron-nitride’s B-N bond length (156pm), is comparable to the C-C bonds length (154pm) found in diamond. Also, its density is very similar to that of diamond. It is similar in hardness to diamond, and it is more resistant to heat than diamond. It is a superhard, high temperature-resistant material that can be used to make cutting tools, drills and abrasives.
Boron Nitride Structure
Boron nitride has a hexagonal crystal. This is usually a graphite-type boron nitride. However, there are also amorphous varieties. Other than the hexagonal crystal form of boron carbide, there are other crystal forms. Graphene-like 2D boron nitride crystallines have also been found (similarly to MoS:2D crystals).
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