Boron nitride ( BN ) by nitrogen and boron atoms in crystal. Six crystal. The a lot of accepted graphite lattice. There is a affectionate of a cubic boron nitride clear variants are accepted as the hardest substance. There are baggy variants. Accepting actinic attrition properties. Not by asleep acerbic and baptize erosion. In hot concentrated abrasive boron carbon band is broken. More than 1200 ℃begins in the air oxidation. Slightly beneath than 3000℃begins sublimate. When the exhaustion is about 2700 ℃decomposition. Slightly acrid in hot acid, baffling in algid water. The about physique of 2.25. The melting point of 3000 DEG C.
Boron nitride ( BN ) bane resistance, electrical insulation and good, than the attrition is greater than 10-6Ω.Cm; compressive backbone 170MPa; in C arbor administration of the thermal amplification accessory is 41 × 10-6/℃and in the administration of d arbor is - 2.3 ×10-6; in the acerbic atmosphere best use temperature is 900 ℃, and the in an alive atmosphere at 2800 ℃, but at allowance temperature, lubrication achievement is poor, so generally and graphite fluoride, graphite and molybdenum disulfide as adipose is mixed, the boron nitride crumb burning in oil or baptize can be acclimated as a cartoon or acute basic lubricant, aswell can be acclimated as top temperature boiler sliding locations lubricant, boron nitride sintered physique can be acclimated as accepting self-lubricating backdrop of bearing, sliding locations materials.
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From: Nonferrous metal
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