boron nitride

noun Chemistry.
a white powder, BN, formed by heating boron in nitrogen. In its ordinary form, it has a structure of stacked layers of hexagonal rings, very similar to that of graphite, and is used as a refractory electrical insulator.
Compare Borazon.
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boron nitride
 
n
a white inert crystalline solid existing both in a graphite-like form and in an extremely hard diamond-like form (borazon). It is used as a refractory, high temperature lubricant and insulator, and heat shield. Formula: BN

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boron nitride

(chemical formula BN), synthetically produced crystalline compound of boron and nitrogen, an industrial ceramic material of limited but important application, principally in electrical insulators and cutting tools. It is made in two crystallographic forms, hexagonal boron nitride (H-BN) and cubic boron nitride (C-BN).

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The sample is held in crucibles made from alumina, boron nitride, or graphite.
The tool substrate may be ceramic or metal and the abrasive particles are preferably diamond, but may be cubic boron nitride.
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