Boron nitride is a crystal composed of nitrogen atoms and boron atoms. The chemical composition is 43.6% boron and 56.4% nitrogen, with four different variants: hexagonal boron nitride (HBN), rhombohedral boron nitride (RBN), cubic boron nitride (CBN) and wurtzite nitrogen Boron (WBN).
Various excellent properties of boron nitride, boron nitride compounds have a wide range of uses in industrial production and scientific research and occupy a high position. For example, hexagonal boron nitride is a material with high temperature resistance, corrosion resistance, high thermal conductivity, high insulation and excellent lubricating properties. It is widely used in petroleum, chemical, machinery, electronics, electric power, textile, nuclear industry, aerospace, etc. department. Cubic boron nitride is a multi-functional material that integrates a variety of excellent functions. Its hardness is second only to diamond, but its stability is higher than diamond. Cubic boron nitride has a series of excellent properties such as high stability, high thermal conductivity, high hardness and wide band gap, making it useful in the development of high-temperature and high-power semiconductor devices, the preparation of short-wavelength and ultraviolet optoelectronic devices, heat sink materials, cutting and grinding It has broad application prospects in cutting materials, high temperature resistant and wear resistant protective coatings, and development of high permeability and high stability windows.
PBN(Pyrolytic boron nitride) is a type of hexagonal boron nitride, produced by CVD process (chemical vapor deposition) to create its solid body and all the boron nitride crystals grow parallel to the surface of which the vapor is deposited on. So, PBN is also called chemical vapor deposition boron nitride. Due to the nature of CVD process, thick wall products (>3mm) is usually not available. PBN is also a good choice for extremely high purity boron nitride. As the purity of gas material (BCl3 + NH3 --> BN +HCl) is a lot higher than regular boron nitride powder, purity for PBN is quite high and 99.99% is the typical grade.
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