Plastic and nonmetallic article shaping or treating: processes – Outside of mold sintering or vitrifying of shaped inorganic... – Utilizing chemically reactive atmosphere other than air – per...
Patent
1995-03-30
1997-07-15
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Outside of mold sintering or vitrifying of shaped inorganic...
Utilizing chemically reactive atmosphere other than air, per...
264122, 264125, 423345, B28B 300, C04B 3332
Patent
active
056480288
ABSTRACT:
A sintered composite body of silicon nitride and silicon carbide is manufactured by mixing a silicon powder with a carbonaceous powder and a sintering additive, producing a mixture, molding the mixture into a molded body, heat-treating the molded body in an atmosphere containing a nitrogen gas for thereby simultaneously nitriding and carbonizing silicon contained in the molded body, and subsequently firing the molded body in a nitrogen gas atmosphere. A composite powder of silicon nitride and silicon carbide which is produced by simultaneously nitriding and carbonizing silicon contained in the molded body has a content of .alpha.-type silicon nitride which is at least 30% of all silicon nitride in the composite powder. To produce such a composite powder, a silicon powder is mixed with a carbonaceous powder and a sintering additive, producing a mixture, and the mixture is heat-treated in an atmosphere containing a nitrogen gas at a temperature of at most 1450.degree. C. for thereby simultaneously nitriding and carbonizing silicon contained in the mixture, the arrangement being such that the temperature of the mixture is increased at a rate lower than 2.degree. C./minute from a temperature before the silicon starts being nitrided and carbonized up to the temperature of at most 1450.degree. C.
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Hamazaki Kagehisa
Higuchi Yoshikatsu
Miyake Kazumi
Toyoda Hitoshi
Fiorilla Christopher A.
Honda Giken Kogyo Kabushiki Kaisha
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