Affiliation:
1. Yokohama National University
2. National Institute of Advanced Industrial Science and Technology
Abstract
Post-reaction sintering as a technique for the fabrication of Si3N4 ceramics has received
much attention as a cost-effective process due to the use of cheap Si powder as a raw material. In this
method, the rapid exothermic nitridation of Si results in local melting of Si to cause its agglomeration,
which is expected to be a flaw after densification. Therefore, control of the exothermic reaction is
needed to improve the reliability of post-reaction sintered Si3N4 ceramics. In this study, Si3N4
ceramics were fabricated by post-reaction sintering with Si3N4 or SiO2 powders in order to control the
exothermic reaction. As a result, the microstructure and bending strength of Si3N4 ceramics was
changed by adding these additives. In particular, the addition of SiO2 resulted in the high strength of
Si3N4 ceramics. Consequently, it was found that Si3N4 and SiO2 particles played the role of diluents,
and SiO2 was effective in post-reaction sintering as an oxygen donor.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
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