화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.83, No.8, 2094-2096, 2000
Influence of yttria-alumina content on sintering behavior and microstructure of silicon nitride ceramics
The present study investigates the influence of the content of Y2O3-Al2O3 sintering additive on the sintering behavior and microstructure of Si3N4 ceramics. The Y2O3:Al2O3 ratio was fixed at 5:2, and sintering was conducted at temperatures of 1300 degrees-1900 degrees C. Increased sintering-additive content enhanced densification via particle rearrangement; however, phase transformation and grain growth were unaffected by additive content. After phase transformation was almost complete, a substantial decrease in density was identified, which resulted from the impingement of rodlike beta-Si3N4 grain growth. Phase transformation and grain growth were concluded to occur through a solution-reprecipitation mechanism that was controlled by the interfacial reaction.