Effect of Al2O3-RE2O3 (RE=Lu, Y, Gd, La) Additives on Microstructure and Properties of Silicon Nitride Ceramics

被引：0

作者：

Li T. ^{[1
]}

Chen Y. ^{[1
]}

Li J. ^{[1
]}

Luo L. ^{[1
]}

Yu H. ^{[1
]}

Li W. ^{[1
]}

Xu Z. ^{[1
]}

机构：

[1] State Key Laboratory of Marine Resource Utilization in South China Sea, College of Materials and Chemical Engineering, Hainan University, Haikou

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2019年 / 47卷 / 06期

关键词：

Mechanical properties; Microstructure; Rare earth oxide; Silicon nitride;

D O I：

10.14062/j.issn.0454-5648.2019.06.13

中图分类号：

学科分类号：

摘要：

Silicon nitride ceramics were prepared via hot-pressing at a sintering temperature of 1800℃ with α-silicon nitride as a raw material and Al2O3-RE2O3 (RE=Lu, Y, Gd and La) as sintering additives. The effect of sintering additives on the phase composition, microstructure and mechanical properties of silicon nitride ceramics was investigated. The results show that α-Si3N4 in the sample can completely convert to β-Si3N4 with long columnar grains. The relative density and mechanical properties of the material increase with the increase of the rare-earth element ion radius, and the flexural strength and fracture toughness of Si3N4-Al2O3-Gd2O3 are 860 MPa and 7.2 MPa m1/2, respectively. Due to the effect of rare earth element ions on the viscosity of the sintered liquid phase, the growth of exaggerated grains occurs in the samples of Si3N4-Al2O3-Lu2O3and Si3N4-Al2O3-Y2O3, andSi3N4-Al2O3-La2O3 has a strong grain interface bonding between the matrix and columnar grain, leading to the reduction of their mechanical properties. © 2019, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：796 / 802

页数：6

共 17 条

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