Thermal Conductive Material--Hexagonal Boron Nitride

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What is boron nitride?
 
Boron nitride is a crystal (BN) composed of nitrogen atoms and boron atoms, and its chemical composition is 43.6% boron and 56.4% nitrogen.
 
What are the classifications of boron nitride?
 
According to the crystal type, boron nitride is divided into hexagonal boron nitride, cubic boron nitride, rhombohedral boron nitride and wurtzite boron nitride. However, the current research on boron nitride mainly focuses on the two crystal forms of hexagonal boron nitride and cubic boron nitride.

 
What are the physical and chemical properties of hexagonal boron nitride?
 
The crystal structure of hexagonal boron nitride has a similar layered structure of graphite, which is a white powder that is loose, lubricating, easy to absorb, and light in weight. The theoretical density is 2.29g/cm3, the Mohs hardness is 2, and the chemical properties are extremely stable. The product has high humidity resistance, and the temperature can reach 2800℃ when used in nitrogen or argon. It not only has a low thermal expansion coefficient, but also a high thermal conductivity. It is not only a good conductor of heat, but also a typical electrical insulator. The thermal conductivity of BN measured with high purity single crystal at 300k is 730w/mk.

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