Influence of yttria-alumina content on sintering behavior and microstructure of silicon nitride ceramics

被引：0

作者：

Yang, Jian-Feng ^{[1
,3
,4
]}

Ohji, Tatsuki ^{[1
,3
]}

Niihara, Koichi ^{[2
,3
]}

机构：

[1] Natl. Indust. Res. Inst. of Nagoya, Nagoya 462-8510, Japan

[2] Inst. of Sci. and Indust. Research, Osaka University, Ibaraki, Osaka 567-0047, Japan

[3] American Ceramic Society, United States

[4] Superplastic Nanoscience Laboratory, Mat. Struct. Form. Proc. Department, NIRIN, Nagoya 462-8510, Japan

来源：

| 1600年 / American Ceramic Soc, Westerville卷 / 83期

关键词：

Additives - Alumina - Ceramic materials - Composition effects - Crystal microstructure - Densification - Grain growth - High temperature effects - Phase transitions - Reaction kinetics - Sintering - Yttrium compounds;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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°-1900 °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 β-Si3N4 grain growth. Phase transformation and grain growth were concluded to occur through a solution-reprecipitation mechanism that was controlled by the interfacial reaction.

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