Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1989-12-29
1993-08-10
Bell, Mark L.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
501 97, 501 98, C04B 3558
Patent
active
052346420
ABSTRACT:
A high-strength silicon nitride sintered body having a flexural strength of 100 kg/mm.sup.2 or higher and a process for producing the same are disclosed, the sintered body comprising not less than 90% by weight of a single crystalline phase of silicon aluminum oxynitride (Si.sub.6-z Al.sub.2 O.sub.z N.sub.8-z, wherein z is a number of from 0 to 4.2) having an average longer diameter of not more than 5 .mu.m and an aspect ratio of not less than 5, the crystal phase constituting a network structure in the sintered body, the balance being a crystalline or amorphous (glassy) phase comprising one or more of oxides or oxynitrides of a rare earth metal, a group 3A metal, a group 2A metal or Si, and the process comprising mixing silicon nitride powder, an organic metal salt as a first sintering aid, and at least one of a metal oxide, a metal nitride, and a metal oxynitride as a second sintering aid, either separately or as a mixture of two or more thereof, with a solvent and a surface active agent, subjecting the mixture or mixtures to ultrasonic dispersion, mixing the mixtures together followed by drying to obtain a mixed powder, molding the mixed powder, and sintering the molded article at a temperature of from 1,600.degree. to 2,200.degree. C. in a non-oxidative atmosphere.
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Higuchi Matsuo
Honda Masaaki
Kuibira Akira
Matsunuma Kenji
Miyake Masaya
Bell Mark L.
Bonner C.
Sumitomo Electric Industries Ltd.
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