What is boron nitride? Boron nitride crystal belongs to the hexagonal crystal system, its structure is similar to graphite, and its properties have many similarities, so it is also called "white graphite".
Characteristicof boron nitride It has good heat resistance, thermal stability, thermal conductivity, high temperature dielectric strength, and is an ideal heat dissipation material and high temperature insulating material. Boron nitride is chemically stable and resistant to corrosion by most molten metals. It also has good self-lubricating properties. Boron nitride products have low hardness and can be machined with an accuracy of 1/100mm.
Performance of boron nitride Boron nitride can be used to manufacture crucibles for smelting semiconductors and high-temperature containers for metallurgy, semiconductor heat-dissipating insulation parts, high-temperature bearings, thermowells and glass forming molds. The boron nitride usually obtained is a graphite-type structure, commonly known as white graphite. The other is diamond type. Similar to the principle of converting graphite into diamond, graphite-type boron nitride can be converted into diamond-type boron nitride at high temperature (1800°C) and high pressure (800Mpa). The B-N bond length (156pm) in this boron nitride is similar to the C-C bond length (154pm) of diamond, and its density is similar to that of diamond. Its hardness is comparable to that of diamond, and its heat resistance is better than that of diamond. It is a new type of high temperature resistant superhard material for making drills, abrasives and cutting tools.
Structure of Boron Nitride Boron nitride is a hexagonal crystal, most commonly a graphite lattice, and there are also amorphous variants. In addition to the hexagonal crystal form, boron carbide has other crystal forms, including: rhombohedral boron nitride (abbreviation: r-BN, or Said: trigonal boron nitride, its structure is similar to h-BN, which will be produced in the process of h-BN conversion to c-BN), cubic boron nitride [abbreviation: c-BN, or |3-BN, or z -BN (that is, sphalerite-type boron nitride), the texture is very hard], wurtzite-type boron nitride (abbreviation: w-BN, h-BN is a hard state under high pressure). Graphene-like 2D boron nitride crystals have even been found (similar to MoS: 2D crystals).
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