Oxidation-induced crack healing in Zr2Al4C5 ceramic

被引：20
|
作者：
Chen, Guiqing [1 ]
Zhang, Rubing [1 ]
Zhang, Xinghong [1 ]
Zhao, Lei [1 ]
Han, Wenbo [1 ]
机构：
[1] Harbin Inst Technol, Ctr Composite Mat, Harbin 150001, Peoples R China
来源：
MATERIALS & DESIGN | 2009年 / 30卷 / 09期
基金：
中国国家自然科学基金;
关键词：
Crack healing; Flexural strength; Oxidation; REINFORCED ALUMINA; SILICON-NITRIDE; BEHAVIOR; CARBIDE; COMPOSITES; INTEGRITY; STRENGTH; TI3ALC2; AIR;
D O I：
10.1016/j.matdes.2009.02.024
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The crack-healing behavior of Zr2Al4C5 was investigated by oxidizing the pre-cracked sample. A Vickers indentation (similar to 80 mu m in size) was introduced and the crack was healed under different temperature. Cracks could heal completely in air above 1000 degrees C, with oxidation products consisting primarily of t-ZrO2 and alpha-Al2O3. The bending strength of crack-healed specimen (188-283 MPa) is higher than that of cracked samples (182 MPa), but all of them are lower than the strength of as-sintered and polished specimens (420 MPa). This composite has self crack-healing ability at temperatures ranging from 800 to 1200 degrees C, with 1000 degrees C being the optimum healing temperature. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：3602 / 3607
页数：6
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