Boron nitride, or BN, is an advanced ceramic material available in solid and powder form. It has high heat capacity, outstanding thermal conductivity, easy machinability, lubricity, low dielectric constant and superior dielectric strength. These properties make boron nitride a truly outstanding ceramic material.
The hexagonal form boron nitride (HBN) corresponding to graphite is the softest and most stable form among BN polymorphs, and is therefore used as lubricant and an additive to cosmetic products. The cubic boron nitride(CBN) variety analogous to diamond has high hardness which is inferior only to diamond. The rare wurtzite boron nitride (WBN) modification is similar to lonsdaleite, and it may even be harder than CBN.
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Because of excellent thermal and chemical stability, boron nitride ceramics are traditionally used as parts of high-temperature equipment. Boron nitride also has potential use in nanotechnology. Boron nitride nanotubes can be produced that have a structure similar to that of carbon nanotubes, i.e. graphene (or BN) sheets rolled on themselves, but the properties are very different. Hexagonal BN (h-BN) Ceramic is usually used to make BN crucible. Cubic boron nitride (c-BN) is used as an abrasive and is an ideal material for heat spreaders. Amorphous boron nitride (a-BN) Layers of amorphous boron nitride (a-BN) are used in some semiconductor devices.