Alternate Names: BN
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+.
Out Bound Links
Forming pottery by pouring deflocculated (water reduced) clay slurry into plaster molds. In the process the absorbent plaster pulls water from the slurry and over a period of minutes a layer builds up against the mold surface. The slurry is then poured out and within a short time the item shrinks sl...
In ceramics, when we speak of deflocculation, we are almost always talking about making a casting slip. Glazes can also be deflocculated (to reduce water content and densify laydown). Deflocculation is the process of making a clay slurry that would otherwise be very thick and gooey into a thin po...
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Hot pressing is a process used to fabricate ceramic parts (often from non-oxide powders like BIN, SiC or B4C). The process involves the simultaneous application of pressure and heat to a 'green' component or powder under a controlled atmosphere (depending on the material being processed). Since pres...