Boron nitride-containing bodies and method of making the same

Details Boron nitride-containing bodies and method of making the same Boron nitride-containing bodies and method of making the same

1992-12-07

1994-06-14

Klemanski, Helene

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3558

Patent

active

053209893

ABSTRACT:
A relatively chemically inert ceramic material produced from a clay-like mixture of boron nitride powder and aluminum oxide, where the aluminum oxide is derived from colloidal aluminum oxide, peptized aluminum oxide, or a dissolved aluminum salt. The clay-like mixture can be dried in a near net shape without cracking and then pressure-less sintered, or bulk dried. Alternatively, pressure-less sintered bodies can be easily machined to a given shape. The ceramic has properties very similar to those of boron nitride in that it resists damage from molten materials, has a high electrical resistance, has high strength at ambient and elevated temperatures, etc. A typical pressure-less sintered body is formed from a clay made with finely-divided boron nitride mixed with at least one of the listed sources of aluminum oxide such that the final sintered composition contains about 85 wt. % boron nitride.

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