Sintering shrinkage behavior and mechanical properties of HfO 2-added Si3N4 ceramics

被引：0

作者：

Horikawa, Daisuke ^{[1
]}

Tatami, Junichi ^{[1
]}

Wakihara, Toru ^{[1
]}

Komeya, Katsutoshi ^{[1
]}

Meguro, Takeshi ^{[1
]}

机构：

[1] Graduate School of Environment and Information Sciences, Yokohama National University, Hodogayaku, Yokohama, 240-8501

来源：

Key Engineering Materials | 2009年 / 403卷

关键词：

Hafnia; Mechanical properties; Silicon nitride; Sintering shrinkage behavior;

D O I：

10.4028/3-908454-00-X.35

中图分类号：

学科分类号：

摘要：

HfO2-added Si3N4 ceramics are known to exhibit excellent high-temperature strength and excellent damage characteristics because HfO2 assists the crystallization of the grain boundary phase. However, the sintering shrinkage behavior and mechanical properties of HfO2-added Si3N4 have not been well clarified so far, although it has been reported that TiO2, in which Ti is from the same group as Hf in the periodic table, enhances the densification of the Si3N4-Y2O3-Al2O 3-AlN system and wear resistance due to TiN formed from TiO 2 and AlN in the grain boundary. In the present study, we focus on HfO2 as the sintering aid to investigate the sintering shrinkage behavior and mechanical properties of HfO2-added Si3N 4. The powder mixtures are prepared by the addition of HfO 2 to the Si3N4-Y2O 3-Al2O3 or Si3N4-Y 2O3-Al2O3-AlN system. The sintering shrinkage curves of HfO2-added Si3N4 ceramics show rapid shrinkage at 1600°C as compared with those of the Si 3N4 ceramics without HfO2. The shrinkage can be explained by the formation of SiO2-Y2O 3-HfO2 derived liquid phases. Furthermore, the mechanical properties of HfO2-added Si3N4 were as excellent as those of the Si3N4 ceramics without HfO 2.

引用

页码：35 / 38

页数：3

共 8 条

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