Doped silicon nitride article

Details Doped silicon nitride article Doped silicon nitride article

1987-06-29

1989-05-30

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

264 65, 501 12, 501 97, 501 98, C04B 3558

Patent

active

048349283

ABSTRACT:
A process for making a homogeneous yttria-alumina doped silicon nitride article is described. A uniform coating of yttria and alumina is applied to the surface of silicon nitride particles by a chemical application of the nitrates of yttrium and aluminum followed by drying and a subsequent conversion of the nitrates to the corresponding oxides. The resulting powder is formed into an article and pressureless sintered to a density greater than 98% of theoretical at temperatures less than 1700.degree. C.

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Szweda, A.; Hendry, A.; Jack, K. H. "The Preparation of Silicon Nitride from Silica by Sol-Gel Processing;" Proc. Br. Ceram. Soc., 1981, 31, No. Spec Ceram. 7 pp. 107-118.

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