Mechanical properties of La2O3 and Nb2O5 doped Al2O3 ceramics prepared by microwave sintering

被引：3
作者：
Ai, Yun-Long [1 ]
Wu, Kai [1 ]
Liang, Bing-Liang [1 ]
Liu, Chang-Hong [2 ]
He, Wen [3 ]
Chen, Wei-Hua [1 ]
He, Fei [1 ]
机构：
[1] Nanchang Hangkong Univ, Sch Mat Sci & Engn, Nanchang 330063, Jiangxi, Peoples R China
[2] Nanchang Hangkong Univ, Natl Def Key Disciplines Lab Light Alloy Proc Sci, Nanchang 330063, Jiangxi, Peoples R China
[3] Nanchang Hangkong Univ, Instrumental Anal Ctr, Nanchang 330063, Jiangxi, Peoples R China
来源：
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN | 2014年 / 122卷 / 1422期
基金：
中国国家自然科学基金;
关键词：
Al2O3 composite ceramics; Microwave sintering; Mechanical properties; Microstructure; TOUGHENED ALUMINA ZTA; MICROSTRUCTURE; BEHAVIOR; FRACTURE; NANOCOMPOSITES; COMPOSITES;
D O I：
10.2109/jcersj2.122.166
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：
La2O3 and Nb2O5 doped Al2O3 ceramics [5Nb(2)O(5)/xLa(2)O(3)-(95-x)Al2O3, x = 2.5-15.0, volume percent] were prepared by microwave sintering processes. The effects of La2O3 content and sintering temperature on densification, phase composition, microstructure and mechanical properties of 5Nb(2)O(5)/xLa(2)O(3)-(95-x)Al2O3 composite ceramics were investigated. The results show that all investigated specimens consisted of alpha-Al2O3, LaNbO4 and LaAl11O18. The sintering temperature of La2O3/Nb2O5 doped Al2O3 ceramic was at least 150 degrees C lower than that of Al2O3 ceramic. The specimens sintered at 1500 degrees C exhibited relative density higher than 92.0%, revealing good sinterability. During the sintering period, LaNbO4 and plate-like LaAl11O18 were formed in-situ. The fracture toughness of 5Nb(2)O(5)/xLa(2)O(3)-(95-x)Al2O3 composite ceramics was above 70% higher than that of Al2O3 ceramic. 5Nb(2)O(5)/7.5La(2)O(3)-82.5Al(2)O(3) composite ceramic presented excellent mechanical properties: HV = 12.6 GPa, K-IC = 6.3 MPa center dot m(1/2) (1500 degrees C). (C) 2014 The Ceramic Society of Japan. All rights reserved.
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页码：166 / 170
页数：5
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