Microstructure and mechanical properties of ZTA fabricated by liquid phase sintering

被引：50
|
作者：
Huang, XW [1 ]
Wang, SW [1 ]
Huang, XX [1 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2003年 / 29卷 / 07期
关键词：
microstructure-final; mechanical properties; Al2O3; ZrO2; liquid phase sintering;
D O I：
10.1016/S0272-8842(02)00228-6
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Zirconia-toughened alumina (ZTA) ceramics with ZrO2 Volume fraction from 0 to 50 vol.% were pressurelessly prepared with the addition of 1 wt.% Tio(2)-1 wt.% MnO2 and 2 wt.% CaO-Al2O3-SiO2 (CAS) as sintering aids. The influence of ZrO2 content and sintering temperature on microstructure and mechanical properties of the composites were investigated. All samples can be fully densified at as low as 1400 degreesC. For pure Al2O3 sample, platelike grains appeared. With the addition of ZrO2, platelike grains of Al2O3 conversed to equiaxed grains and their sizes decreased gradually. Mechanical properties increased with ZrO2 content. When 50 vol.% was added, strength and toughness of composite reached 619+/-36 MPa and 7.02+/-0.06 MPam(1/2), respectively. The toughening mechanism was phase transformation based on analyzing the transformable ZrO2 content. (C) 2003 Elsevier Ltd and Techna S.r.l. All rights reserved.
引用
收藏
页码：765 / 769
页数：5
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