Process for the production of silicon nitride sintered bodies

Details Process for the production of silicon nitride sintered bodies Process for the production of silicon nitride sintered bodies

1983-08-08

1985-06-04

Bell, Mark

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

501 97, C04B 3558

Patent

active

045213585

ABSTRACT:
Processes for the production of a silicon nitride sintered body are disclosed. One process comprises molding a mixed powder of 100 parts by weight of metallic silicon with a maximum particle size of 20 .mu.m or less and 0.2 to 2 parts by weight (calculated as chromium oxide) of a chromium component and, thereafter, reaction sintering the mold in a nitrogen gas or in a non-oxidizing atmosphere containing nitrogen gas at a temperature of 1,300.degree. to 1,500.degree. C. This invention provides further process which comprises molding a mixed powder of 100 parts by weight of metallic silicon with a maximum particle size of 20 .mu.m or less, 0.2 to 1 part by weight (calculated as chromium oxide) of a chromium component, and further 10 to 20 parts by weight of an oxide component of one or more of the oxides of yttrium, lanthanum, cerium, gadolinium, and erbium, reaction sintering the above-prepared mold, and thereafter, hot pressing the reaction sintered body. This silicon nitride hot pressed body is superior in oxidation resistance, and moreover is of high density and has high mechanical strength. Thus it is suitable for use as, e.g., gas turbine parts of diesel engine parts.

REFERENCES:
patent: 4004937 (1977-01-01), Masaki
patent: 4097293 (1978-06-01), Komeya et al.
patent: 4280850 (1981-07-01), Smith et al.
patent: 4332909 (1982-06-01), Nishida et al.
patent: 4440707 (1984-04-01), Shimamori et al.

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