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Boron Nitride

Alternate Names: BN

Notes

Boron Nitride is a non oxide man made ceramic that occurs in two distinct particle shapes.

The primary alpha BN has flat particles similar to graphite or kaolinite. Among its other excellent thermal and electrical properties, BN has the ability to resist wetting by molten metals and is thus used as a parting agent for metal casting, especially aluminum). Its particle shape makes BN suitable as a solid lubricant for high temperature applications.

Beta BN has a cubic particle shape and is the second hardest material known. It is made from alpha BN. It is used to make a wide range of wear resistant parts.

Very fine BN powders can be cast into shapes using traditional slurry deflocculation and plaster casting methods. The cast parts separate best from completely dry molds. Items need to be fired to 1500C+.

Related Information

Links

Oxide Analysis Formula
Materials Alumina
Materials Silicon Carbide
Materials Boron Carbide
Typecodes Abrasive Resistant Super Hard Material
These materials are generally available in granular form, the particles are cemented together using frits to produce abrasive products. However powdered and slurried forms of these materials can also be formed and fired by various means to produce hard materials.
Typecodes Non-Oxide Material
Many of these materials are not used in traditional ceramics but they have such incredible properties that some have been included in this database.
URLs http://en.wikipedia.org/wiki/Boron_nitride
Boron Nitride at Wikipedia
Glossary Deflocculation
The deflocculation process is the magic behind the ceramic casting process. It enables you to make a slurry of far lower water content and thus lower shrinkage.
Glossary Hot Pressing
Glossary Slip Casting
A method of forming ceramics where a deflocculated (low water content) slurry is poured into absorbent plaster molds, forming a layer against mold walls, then poured out.

By Tony Hansen


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