Crack-healing in spinel (MgAl2O4) ceramic

被引：13

作者：

Tavangarian, Fariborz ^{[1
]}

Li, Guoqiang ^{[1
,2
]}

机构：

[1] Louisiana State Univ, Dept Mech & Ind Engn, Baton Rouge, LA 70803 USA

[2] Southern Univ, Dept Mech Engn, Baton Rouge, LA 70813 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 641卷

基金：

美国国家科学基金会;

关键词：

Spinel; Crack-healing; Ceramic; Abnormal grain growth; OXIDATION; STRENGTH; BEHAVIOR; PHASE;

D O I：

10.1016/j.msea.2015.06.045

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper reports the crack-healing behavior in spinel ceramic. Spinel nanopowder was synthesized via mechanical activation with subsequent annealing of magnesium carbonate and aluminum hydroxide. The produced nanopowder was uniaxially pressed and then sintered at 1200 degrees C for 1 h. Initial cracks were produced on the surface of the sintered bodies by Vickers indenter to investigate the healing behavior of spinel after various heat treatment regimes. It was found that cracks can be healed completely after annealing the specimens at 1600 degrees C for 100 h. Those specimens sintered at lower temperatures and/or sintered for less times showed partial healing. The results demonstrated that sintering process and abnormal grain growth are responsible for crack-healing in spinel. Also the healing efficiency was expressed as the strength recovery of the pre-cracked samples after healing procedures and was evaluated by diametral tensile strength (DTS) test or indirect tensile test (ITT). It was found that the strength recovery of those samples heat treated at 1600 degrees C for 100 h was about 91%, which suggests high healing efficiency. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：201 / 209

页数：9

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