Process for producing silicon nitride sintered products having h

Details Process for producing silicon nitride sintered products having h Process for producing silicon nitride sintered products having h

1982-09-29

1984-04-03

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

423344, 501 97, C04B 3538

Patent

active

044407076

ABSTRACT:
A process for producing a silicon nitride sintered product having high toughness is described, comprising blending from 97 to 57% by weight of metallic silicon powder having a maximum particle size of 25 .mu.m or less with from 1 to 15% by weight, calculated as TiN, of a TiN powder having a maximum particle size of 20 .mu.m or less or a powder of titanium component capable of changing into TiN during reaction sintering, and from 2 to 28% by weight of one or more components selected from the group consisting of AlN, Al.sub.2 O.sub.3, SiO.sub.2 and oxides of rare earth elements, molding the resulting mixture, carrying out reaction sintering in a nonoxidizing atmosphere of a nitrogen gas or a nitrogen-containing mixed gas, and thereafter resintering in the same atmosphere at a temperature of from 1,600.degree. C. to 2,200.degree. C.

REFERENCES:
patent: 4127630 (1978-11-01), Washburn
patent: 4351787 (1982-09-01), Martinengo et al.

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