Preparation of very strong and very heat-stable ceramic moldings

Details Preparation of very strong and very heat-stable ceramic moldings Preparation of very strong and very heat-stable ceramic moldings

1986-01-21

1988-03-29

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 65, 264332, 501 97, C04B 3558

Patent

active

047342340

ABSTRACT:
Pore-free, compact moldings of silicon nitride are produced by a method in which amorphous silicon nitride powder is compressed in a first stage at from 1200.degree. to 1350.degree. C. and from 50 to 600 kp/cm.sup.2 to give a glassy molding, and the silicon nitride is converted in a second stage to crystalline silicon nitride at from 1400.degree. to 1800.degree. C. without the use of pressure.

REFERENCES:
patent: 3835211 (1974-09-01), Coe
patent: 4025351 (1977-05-01), Masaki
patent: 4073845 (1978-02-01), Buljan et al.
patent: 4097293 (1978-06-01), Komeya et al.
patent: 4264547 (1981-04-01), Pous
patent: 4264550 (1981-04-01), Ezis
patent: 4376652 (1983-03-01), Buljan

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