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

页码：3602 / 3607

页数：6

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