Pyrolytic boron nitride article

Details Pyrolytic boron nitride article Pyrolytic boron nitride article

1986-02-19

1987-09-01

Martin, Roland E.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428688, 428704, 156DIG83, 156DIG86, 423290, 432265, 264 81, B65D 100

Patent

active

046908412

ABSTRACT:
A pyrolytic boron nitride article has a uniform structure 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 a 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. In 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: 2801903 (1957-08-01), Fetterley et al.
patent: 3152006 (1964-10-01), Basche
patent: 3986822 (1976-10-01), Lashway
patent: 4188194 (1980-02-01), Corrigan
patent: 4402925 (1983-09-01), Shinko et al.

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