Boron nitride crucible
First Claim
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1. 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.
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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.
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9 Claims
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1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- an internal surface and an external surface;
Specification