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US 5,158,750 AGranted
Boron nitride crucible
AssigneePraxair S.T. Technology, Inc.
InventorRobert L. Finicle
Life of this patent
Estimating the term…
Abstract
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, has a duplex coating comprising an undercoat of pyrolytic graphite and a top coat of pyrolytic boron nitride. A process for making the boron nitride crucible is also disclosed.
Claims9
A boron nitride crucible having a closed end, an open end, a length extending from the open end to the closed end;
- an internal surface and an external surface;
- wherein at least a portion of the external surface of the crucible has a duplex coating comprising an undercoat of pyrolytic graphite and a top coat of pyrolytic boron nitride completely superimposing the undercoat and wherein neither the undercoat nor the top coat is the structural member of the crucible.
Dependencies are inferred from the claim text.