Boron Nitride

Name:
Boron Nitride
Detailed information:

M Formula:	BN
Properties:
White powder; particle diameter approximately 1 micron. Mp 3000C (sublimes). Graphitelike, hexagonal plate structure. High electrical resistance. Compressed at 106 psi, itbecomes hard as diamond. Excellent heat-shock resistance, low mechanical strength, hygroscopic. Noncombustible.
Derivation:
Heating a mixture of boric acid and tricalcium phosphate in ammonia atmosphere in an electric furnace.
Available forms:
Powder, compressed solid, fibers, whiskers.
Use:
Refractory, furnace insulation, crucibles, rectifying tubes, dielectric, chemical equipment, self-lubricating bushings, molten-metal pump parts, transistor and rectifier mounting wafers,heat-shield for plasma, nose-cone windows, heat-resistant fibers stable to 870C in oxidizing atmosphere for military composites, metalworking abrasive, high-temperature insulator, high-strengthfibers.