Method for producing pyrolytic boron nitride article

Details Method for producing pyrolytic boron nitride article Method for producing pyrolytic boron nitride article

1987-04-24

1989-07-18

Childs, Sadie

Plastic and nonmetallic article shaping or treating: processes

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

4272552, B29C 4122

Patent

active

048491462

ABSTRACT:
A pyrolytic boron nitride article of the invention has uniform structure and has 0.5 or less nodules/cm.sup.2 in average all through the overall surface of the article and 2 or less nodules in any portion of the unit square centimeter on the surface of the article. The pyrolytic boron nitride article is produced by depositing boron nitride through a vapor phase, using a boron halide gas and an ammonia gas as the starting materials. Upon production, the ammonia gas or a gas mixture containing the ammonia gas is not contacted directly with graphite at 300.degree. to 1850.degree. C.

REFERENCES:
patent: 3152006 (1964-10-01), Basche
patent: 3825440 (1974-07-01), Branovich et al.
patent: 4058579 (1977-11-01), Lashway
patent: 4385080 (1983-05-01), Rudnay

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