Process for forming a crack-free boron nitride coating on a carb

Details Process for forming a crack-free boron nitride coating on a carb Process for forming a crack-free boron nitride coating on a carb

1992-01-10

1994-01-04

Lusigan, Michael

Coating processes

Coating by vapor, gas, or smoke

Mixture of vapors or gases utilized

4272551, 4272481, C23C 1634

Patent

active

052758443

ABSTRACT:
A process for producing a crack-free coating of pyrolytic boron nitride on a carbon structure in which the coating is formed in a controlled atmosphere containing vapors of ammonia and gaseous boron halide within a temperature range of between 1500.degree. C. to 1700.degree. C.

REFERENCES:
patent: 3152006 (1964-10-01), Basche
patent: 3578403 (1968-07-01), Moore
patent: 4225569 (1980-09-01), Matsui et al.
patent: 4522842 (1985-06-01), Levinstein et al.
patent: 4849146 (1989-07-01), Tanji et al.
patent: 4900526 (1990-02-01), Matsuda et al.

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