Methods of forming ceramic materials and ceramic products, and c

Details Methods of forming ceramic materials and ceramic products, and c Methods of forming ceramic materials and ceramic products, and c

1983-02-23

1985-03-19

Douglas, Winston A.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 264 65, 264 66, C04B 3518

Patent

active

045060207

ABSTRACT:
A method of producing a dense ceramic product comprises the steps of mixing a ceramic powder containing a major proportion of an alpha-phase substituted silicon nitride obeying the formula M.sub.x (Si,Al).sub.12 (O,N).sub.16, where x is not greater than 2 and M is a modifying cation (e.g. yttrium, calcium, lithium, magnesium, cerium) with at least one nitride of silicon and/or alumina wherein the alumina represents not more than 10% by weight of the mixture; and sintering the mixture in a non-oxidizing atmosphere at a temperature of 1700.degree. C. to 1900.degree. C. so as to produce (1) a dense ceramic product consisting essentially of beta-phase substituted silicon nitride having the general formula Si.sub.6-z Al.sub.z N.sub.8-z O.sub.z, where z is greater than zero and not greater than 1.5, and 0.05% wt to 20% wt of a further phase containing said modifying cation M, or (2) a dense ceramic product consisting essentially of said beta-phase substituted silicon nitride a 0.05% wt to 90% wt of an alpha-phase substituted silicon nitride obeying said formula M.sub.x (Si,Al).sub.12 (O,N).sub.16 and a minor amount of a further phase containing said modifying cation M.

REFERENCES:
patent: 3262761 (1966-07-01), Bechtold
patent: 3356513 (1967-12-01), Washburn
patent: 4113503 (1978-09-01), Lumby et al.
patent: 4127416 (1978-11-01), Lumby et al.
patent: 4184884 (1980-01-01), Jong
patent: 4243621 (1981-01-01), Mori et al.

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