Microstructure, mechanical properties and thermal shock resistance of ZrO2-LaPO4 composites

被引：15

作者：

Li, Zhongqiu ^{[1
]}

Liu, Jiachen ^{[1
]}

Li, Shun ^{[1
]}

Du, Haiyan ^{[1
]}

机构：

[1] Tianjin Univ, Key Lab Adv Ceram & Machinig Technol, Minist Educ, Tianjin 300072, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 480卷 / 02期

基金：

中国国家自然科学基金; 国家高技术研究发展计划(863计划);

关键词：

Ceramics; Composites; Mechanical properties; Microstructure; Scanning electron microscopy; CERAMICS; ALUMINA;

D O I：

10.1016/j.jallcom.2009.02.076

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

4YSZ-LaPO4 composites with different LaPO4 Content ranging from 0 to 30 vol.% were prepared. Influence of LaPO4 content on the microstructure, mechanical properties and thermal shock resistance under mild thermal conditions of the composites were investigated. With the increased content of monazite LaPO4, Vickers hardness, flexural strength and fracture toughness of the 4YSZ-LaPO4 composites exhibited a gradual degradation, while the thermal shock resistance was improved obviously. Results showed that the critical thermal shock temperature (Delta T-c) of 4YSZ/30 vol.% LaPO4 composite under air quenching was 1400 degrees C, which was 400 degrees C higher than that of monolithic 4YSZ. Improvement of thermal shock resistance for 4YSZ-LaPO4 composites was mainly due to the higher ratio value of K-lc/sigma and the crack deflection and bridging at weak bonding interface between ZrO2 and LaPO4. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：863 / 866

页数：4

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