Vessel for refractory use having multi-layered wall

Details Vessel for refractory use having multi-layered wall Vessel for refractory use having multi-layered wall

1986-07-15

1988-10-04

Kittle, John E.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428218, 432264, 432265, F27B 1410

Patent

active

047755652

ABSTRACT:
The inventive vessel, e.g. crucible, made of a refractory inorganic material such as boron nitride has a multi-layered wall structure which is an integral alternate lamination of layers of higher density and layers of lower density. Such a multi-layered structure can be formed by the procedure of pyrolytic chemical vapor deposition in the course of which the concentration of the gaseous reactants, e.g. boron trichloride and ammonia, in the atmosphere is changed, i.e. increased or decreased, under control so that the resultant deposited boron nitride layer has different densities in the portions deposited before and after the concentration change. By virtue of the multi-layered wall structure, the vessel has outstandingly improved resistance against thermal shock and can withstand prolonged use or many times of repeated use at high temperatures without breaking or crack formation.

REFERENCES:
patent: 3491992 (1970-01-01), Reichelt
patent: 3724996 (1973-04-01), Montgomery
patent: 3911188 (1975-10-01), Torti et al.
patent: 3931438 (1976-01-01), Beall et al.
patent: 4492765 (1985-01-01), Buljan
patent: 4552800 (1985-11-01), Blasch et al.

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