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Reaction Sintering Property of Green Compact of Si and TiC Mixed Powders in Nitrogen

Published online by Cambridge University Press:  15 February 2011

Yoshiyuki Yasutomi ,
Masahisa Sobue ,
Shin-Ichi S. Shinozaki ,
John Hangas  and
Shin-Ichi S. Shinozaki
Yoshiyuki Yasutomi
Affiliation:
Hitachi Research Laboratory, Hitachi Ltd., Ibaraki 319–12 JAPAN
Masahisa Sobue
Affiliation:
Hitachi Research Laboratory, Hitachi Ltd., Ibaraki 319–12 JAPAN
Shin-Ichi S. Shinozaki
Affiliation:
Scientific Research Laboratories, Ford Motor Co., Dearborn, MI 48121
John Hangas
Affiliation:
Scientific Research Laboratories, Ford Motor Co., Dearborn, MI 48121
Shin-Ichi S. Shinozaki
Affiliation:
Scientific Research Laboratories, Ford Motor Co., Dearborn, MI 48121
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Abstract

We have developed a new type of near net shape sintering process using nitridation of Si and other inorganic powders. In this report, the sintering property of powder mixture compacts of TiC (10μm or 0.9μm) and Si (0.9μm) in a nitrogen atmosphere at 1350°C was investigated.

A large portion of the Si formed Si3N4 on reaction with nitrogen, while TiC formed TiN and free carbon. A small portion of this free carbon was converted into β-SiC on reaction with Si and about 98% of the free carbon remained in the sintered body. Thus, composite ceramics having a composition of Si3N4·TiC·TiN·C·β-SiC were obtained. The porosity of this composite was much smaller than that of ordinary Si3N4 bonded ceramics, because of the large volume expansion for formation of free carbon. The pore size under 5μm can be got using TiC powder with an avarage size of 0.9μm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 251: Symposium S – Pressure Effects on Materials Processing and Design , 1991 , 187
Copyright
Copyright © Materials Research Society 1992

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References

5. References

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