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Chemical formula BN, boron-nitogen-compound with hexagonal (graphite-like) or cubic (diamond-like) crystal lattice structure.

Hexagonal boron nitride

crystallizes like graphite in a layer lattice and is therefore often called "white graphite". Its very good thermal (high melting- or sublimation point and good thermal shock stability) and physical characteristics (good electrical insulator, good heat conductivity and good high temperature lubrication qualities) make it an interesting ceramic material. One of the most well-known characteristics of hexagonal boron nitride is the very bad wettability by metal melts (like Al, Mg, Zn, Pb and Cu), slags as well as salt melts. Boron nitride is stable at air to approx. 1000°C (1832°F), under reduced conditions or inert gases it can be used up to 1800°C (3272°F).

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SEM image (secondray electron image) of boron nitride particles (magnification 6000-times)

 

Refractory materials on boron nitride base are available in the form of powders, hot isostatic pressed shaped parts and as suspensions (boron-nitride-coatings) for coating by dipping, brushing or spraying.

Cubic boron nitride,

also called borazon, is a hard material of high microhardness used for grinding applications.

Properties of boron nitride

Formular

BN

Molecular mass

24.82 g/mol

Density (hexagonal)

2.27 g/cm³

Density (cubic)

3.48 g/cm³

Melting range

2700-3000°C

CAS-No.

10043-11-5

EINECS-No.

233-136-6

 


© 2015 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst


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What is boron nitride?

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