Hot pressing densification aid for alumina

Details Hot pressing densification aid for alumina Hot pressing densification aid for alumina

1991-08-29

1992-12-01

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264332, 264338, 501 98, 501127, C04B 3510

Patent

active

051678861

ABSTRACT:
A boron compound, capable of forming boron oxide on hot pressing in an oxygen-containing atmosphere, is used as a densification aid for hot pressing of alumina-containing ceramics in oxygen-containing atmospheres. The boron compound may be incorporated into the material to be hot pressed or may be applied to the surface of that material. Air may be used as the hot pressing atmosphere. The alumina-containing ceramic to be hot pressed may be formed by reaction processing techniques. Boron nitride is a preferred boron compound.

REFERENCES:
patent: 2745763 (1956-05-01), Veltz
patent: 4041123 (1977-08-01), Lange
patent: 4217948 (1980-08-01), Merzhanov
patent: 4343909 (1982-08-01), Adams
Cremer, Herbert W., Chemical Engineering Prentice, vol. 1 1956, Academic Press Inc. Pub., New York, pp. 93-95.
The Condensed Chemical Dictionary, 6th Edition, Reinhold Pub., Corp., New York, 1961, p. 106.

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