Effect of nano-Al2O3 and Y2O3 on the properties and microstructure of Si3N4

被引：9

作者：

Gu, Haitao ^{[1
]}

Chen, Han ^{[1
]}

Guo, Lucun ^{[1
]}

机构：

[1] Nanjing Univ Technol, Coll Mat Sci & Engn, Nanjing 210009, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 491卷 / 1-2期

关键词：

nitrides; X-ray diffraction; sintering; mechanical properties;

D O I：

10.1016/j.msea.2008.01.073

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nano-Al2O3 and Y2O3 had a significant effect on the microstructural evolution and mechanical properties of Si3N4. With the addition of nano-Al2O3, large elongated grains were developed and the grain boundary phase decreased. Besides, the proportion of intergranular fracture increased for nano-Al2O3-doped Si3N4. The highest fracture toughness of nano-Al2O3-doped Si3N4 was 9.5 MPa m(1/2) (7.2 MPa m(1/2) for submicro-Al2O3-doped Si3N4). The increase in mechanical properties might be ascribed to the formation of large elongated grains, the reduction of secondary phases and the "pullout" of elongated grains. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：177 / 181

页数：5

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