Microwave sintering and mechanical properties of La2O3/Nb2O5 toughened Al2O3 ceramics

被引：2
作者：
Liu, Jin [1 ]
Liang, Bingliang [1 ]
Ai, Yunlong [1 ]
Zhang, Jianjun [1 ]
He, Fei [1 ]
He, Wen [1 ]
Liu, Zhiyong [1 ]
机构：
[1] Nanchang Hangkong Univ, Sch Mat Sci & Engn, 696 South Fenghe Ave, Nanchang 330063, Jiangxi, Peoples R China
来源：
JOURNAL OF CERAMIC PROCESSING RESEARCH | 2021年 / 22卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Al2O3; ceramics; Microwave sintering; Phase formation; Mechanical properties; ALUMINA; MICROSTRUCTURE; DENSIFICATION; COMPOSITE; EVOLUTION; FRACTURE; POWDER;
D O I：
10.36410/jcpr.2021.22.3.296
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：
To improve the toughness of Al2O3 ceramic, xLa(2)O(3)/10Nb(2)O(5)-(90-x)Al2O3 (x = 2.5-15.0 vol.%) composite ceramics were synthesized via microwave-sintering. The influences of sintering temperature (T-s) and La2O3 content on phase composition and mechanical property of xLa(2)O(3)/10Nb(2)O(5)-(90-x)Al2O3 composite ceramics were studied. It is shown in the results that the T-s of La2O3/Nb2O5 doped Al2O3 ceramic was 150 degrees C lower than that of Al2O3 ceramic. With the increase of x, La0.33NbO3, LaNbO4 and LaAl11O18 were formed successively. LaNbO4, columnar-Al2O3 grains and LaAl11O18 with plate-like shape were generated in-situ during the sintering period. Compared to Al2O3 ceramic, the fracture toughness of xLa(2)O(3)/10Nb(2)O(5)-(90-x)Al2O3 ceramics were at least 70% higher when 5.0 <= x <= 12.5. 7.5La(2)O(3)/10Nb(2)O(5)-82.5Al(2)O(3) ceramic exhibited superior mechanical property: Hv = 12.0 GPa, K-IC = 6.2 MPa.m(1/2) (1,500 degrees C, 30 min).
引用
收藏
页码：296 / 300
页数：5
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