Process for producing a translucent .beta.-sialon sintered produ

Details Process for producing a translucent .beta.-sialon sintered produ Process for producing a translucent .beta.-sialon sintered produ

1982-06-14

1984-03-20

McCarthy, Helen M.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Optical fiber, waveguide, or preform

264 65, 264332, 501 98, 501904, C04B 3558, C04B 3564

Patent

active

044380518

ABSTRACT:
A process for producing a translucent .beta.-sialon sintered product, which comprises mixing fine powders of silicon nitride and aluminum nitride having a high purity of at least 99% and a particle size of at most 200 microns and fine powders of aluminum oxide and silicon oxide having a high purity of at least 99% in such a proportion as to form .beta.-sialon of the formula Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z where z is from 1 to 4.2, and hot-pressing the mixture in a nitrogen atmosphere at a temperature of from 1500.degree. to 1850.degree. C. under pressure of from 10 to 1500 kg/cm.sup.2.

REFERENCES:
patent: 3903230 (1975-09-01), Kamigaito et al.
patent: 3991148 (1976-11-01), Lumby et al.
patent: 4113503 (1978-09-01), Lumby et al.
patent: 4146379 (1979-03-01), Copley et al.
patent: 4241000 (1980-12-01), McCauley et al.
patent: 4310499 (1982-01-01), Mitomo et al.
Mitomo, M. et al.-"Translucent .beta.-Sialon Ceramics"(1982), J. of Materials Science Letters, pp. 25-26.
Mitomo, M. et al.-"Microstructure of Translucent .beta.-Sialon Ceramics", Ceramic Powders-Ed. by P. Vincenzi (1983), Pub. by Elsener Sci. Pub. Co., Amsterdam, The Netherlands, pp. 911-920.
Mitomo, M. et al. "Fabrication of High Strength .beta.-Sialon by Reaction Sintering"-J. Materials Science 14 (1979), pp. 2309-2316.

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