Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1993-10-29
1996-08-13
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
264570, 501 97, 501 98, C04B 35584, C04B 35594
Patent
active
055453627
ABSTRACT:
A sintered silicon nitride excellent in high temperature performance is produced by the following method: First, silicon nitride powder and oxide of at least one element selected from elements in the group IIIb of a periodic table are mixed with each other to obtain a mixture. The silicon nitride powder contains silicon oxide in an amount ranging from 0.1% by weight of the silicon nitride powder to a value not more than a content of the silicon oxide. Second, the mixture is compacted to form a compact. Finally, the compact is fired in atmosphere of nitrogen at a pressure ranging from 5 to 200 atmosphere (atm) and a temperature ranging from 1800.degree. to 2000.degree. C. to obtain a sintered silicon nitrite having a bulk density not less than 95% of a theoretical density of the sintered silicon nitride.
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Akimune Yoshio
Hirosaki Naoto
Okada Akira
Derrington James
Nissan Motor Company
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