Crack healing and strengthening of SiC whisker and ZrO2 fiber reinforced ZrB2 ceramics

被引：40
|
作者：
Lin, Jia [1 ]
Huang, Yu [1 ]
Zhang, Houan [1 ]
机构：
[1] Xiamen Univ Technol, Sch Mat Sci & Engn, Xiamen 361024, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2014年 / 40卷 / 10期
关键词：
Hot pressing; Composites; Strength; Borides; Structural applications; SILICON-NITRIDE; BEHAVIOR; TRANSFORMATION;
D O I：
10.1016/j.ceramint.2014.07.040
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：
Crack healing behavior of ZrB2 based ultra-high temperature ceramics reinforced by ZrO2 fibers and SiC whiskers was investigated by oxidizing a pre-cracked sample. A Vickers indentation was introduced into the sample and the crack was healed at temperature ranging from 800 to 1400 degrees C, with 1200 degrees C being the optimum healing temperature. The crack was completely healed with oxidation products consisting of ZrO2 and SiO2, resulting in a recovered strength similar to 95 MPa higher than that of polished specimens. The good crack-healing ability would make this composite highly useful as it could heal defects and flaws autonomously in practical applications. Our findings may also provide a new insight into improving the strength and structural integrity of ZrB2 based ultrahigh-temperature ceramics. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：16811 / 16815
页数：5
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