|About this Abstract
||Materials Science & Technology 2011
||Green Technologies for Materials Manufacturing and Processing III
||Energy Efficient Sintered Reaction-Bonding Process of Silicon Nitride Ceramics
||Hideki Hyuga, You Zhou, Hideki Kita, Kiyoshi Hirao, Tatsuki Ohji
|On-Site Speaker (Planned)
Amongst a variety of fabrication procedures for silicon nitride and related ceramics, reaction bonded processing has some advantages, such as low sintering shrinkage and low raw material cost. In order to assess the catalytic effect of various rare-earth oxides on the formation of reaction bonded silicon nitride, the nitridation behavior of high purity silicon powder mixed with various rare-earth oxides was studied using thermal gravimetric analysis. Almost all rare-earth added silicon powders exhibited a nitridation enhancing effect. In particular, Eu2O3 and CeO2 additions showed a larger enhancing effect than the other rare-earth oxides. However, there were some differences in the nitridation behavior of samples with these two additives.CeO2 additions resulted in a smaller reduction in nitridation temperature but rapid weight gain above this onset temperature. Eu2O3 resulted in a larger reduction in onset temperature although the initial weight gain was slower.