Process for producing a boron nitride crucible

Details Process for producing a boron nitride crucible Process for producing a boron nitride crucible

1990-06-06

1991-12-24

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Gas or vapor deposition of article forming material onto...

4272557, C23C 1108, B29C 4100

Patent

active

050750550

ABSTRACT:
A process for producing a boron nitride crucible having a closed end, an open end, an internal surface and an external surface, and wherein at least a portion of the external surface, preferably proximate the open end of the crucible, is coated with a duplex layer comprising a first coating of pyrolytic graphite and a top coat of pyrolytic boron nitride.

REFERENCES:
patent: 3986822 (1976-10-01), Lashway
patent: 4058579 (1977-11-01), Lashway
patent: 4264803 (1981-04-01), Shinko
"Boralectric.TM. Boralloy.RTM. Pyrolytic Boron Nitride (PBN)/Pyrolytic Graphite (PG) Resistance Heating Elements", Union Carbide Coatings Service Corporation, Advanced Ceramics, sales literature.
Boralloy.RTM. Pyrolytic Boron Nitride, Union Carbide Corporation, pp. 1-19, sales literature.
Price List Boralloy.RTM. Pyrolytic Boron Nitride Molecular Beam Epitaxy Crucibles, Catalog Section H-8762, Jan. 18, 1988, pp. 1-2, Union Carbide Coatings Service Corporation, Advanced Ceramics, Cleveland, Ohio.
Price List Boralloy.RTM. Pyrolytic Boron Nitride High Purity Crucibles-Boats-Dishes, Catalog Section H-8770, pp. 1-2, Jan. 18, 1988, Union Carbide Coatings Service Corporation, Advanced Ceramics, Cleveland, Ohio.

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