Silicon nitride sintered bodies and a method for producing the s

Details Silicon nitride sintered bodies and a method for producing the s Silicon nitride sintered bodies and a method for producing the s

1983-06-07

1985-08-13

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

264 65, C04B 3558

Patent

active

045350639

ABSTRACT:
Silicon nitride sintered bodies having a high density, high mechanical strength and high fracture toughness, contain specific amounts of oxides or oxynitrides of Sr, Mg, a rare earth element and Zr respectively and the remainder being Si.sub.3 N.sub.4, are produced by shaping a raw batch material containing compounds of each of Sr, Mg, a rare earth element and Zr in given amounts, wherein Zr is added by abrasion of the grinding media and the mixture is pressurelessly sintered in nitrogen or an inert gas atmosphere.

REFERENCES:
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4218257 (1980-08-01), Ode et al.
patent: 4304576 (1981-12-01), Hattori et al.

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