无机材料学报

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增韧Al2O3结构陶瓷氧化反应裂纹愈合动力学研究(Ⅰ) 理论模型

吕珺1, 郑治祥1, 吴玉程1, 金志浩2   

  1. 1. 合肥工业大学材料学院, 合肥 230009; 2. 西安交通大学材料强度国家重点实验室, 西安 710049
  • 收稿日期:2004-12-02 修回日期:2005-02-06 出版日期:2006-01-20 网络出版日期:2006-01-20

Kinetic Research of Oxidation Induced Crack Healing of Engineering Ceramics (Ⅰ) Theoretical Model

LU Jun1, ZHENG Zhi-Xiang1, WU Yu-Cheng1, JIN Zhi-Hao2   

  1. 1. Materials Science and Engineering Institute, Hefei University of Technology, Hefei 230009, China; 2. State Key Laboratory for Mechanical Behavior
    of Materials, Xi’an Jiaotong University, Xi’an 710049, China
  • Received:2004-12-02 Revised:2005-02-06 Published:2006-01-20 Online:2006-01-20

摘要: 氧化反应引起裂纹愈合是结构陶瓷提高强度的一个重要途径. 针对目前研究中缺乏定量性这一不足之处, 本文从热力学和动力学角度研究了氧化反应与裂纹愈合、强度提高之间的定量
关系. 建立了裂纹愈合模型, 并进行了动力学研究, 分析了高温加热时间、温度、裂纹尺寸对裂纹愈合及材料强度的影响. 以期为裂纹愈合与强度恢复的定量或半定量的研究, 实现人为
精确控制裂纹愈合的程度提供一定的理论依据.

关键词: 裂纹愈合, 动力学, 愈合速度, 强度

Abstract: Oxidation reaction induced crack healing is one kind of very important methods to improve the strength of engineering ceramics. The quantitative relation among crack healing, oxidation reaction, and strength
improvement were researched. A crack healing model was established and the kinetic analysis of crack healing studied. The effects of time, temperature, and crack size on crack healing were also
studied. The purpose of this paper is supplying theory foundation for quantitative study of crack healing and exact controlling of crack healing.

Key words: crack healing, kinetic, velocity of healing, strength

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