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Journal of Inorganic Materials

Journal of Inorganic Materials >

2006 , Vol. 21 >Issue 2: 508 - 512

DOI: https://doi.org/10.3724/SP.J.1077.2006.00508

Research Paper

Kinetic Research of Oxidation Induced Crack Healing of Engineering Ceramics (Ⅱ) Model Testing: The Kinetic Research of Al2O3-TiC p Composite

  • Lü Jun ,
  • ZHENG Zhi-Xiang ,
  • WU Yu-Cheng ,
  • JIN Zhi-Hao
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  • 1. 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 date: 2004-12-02

  Revised date: 2005-02-06

  Online published: 2006-03-20

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Abstract

Oxidation reaction happened when Al2O3-TiC p composite heated at high temperature. The reaction producer moved to the crack area which induced crack healing. The heating temperature, time, and indentation affected the crack healing greatly. The kinetic analysis of crack healing of Al2O3-TiC p composite shows that: the strength recovery can be expressed by the following formula:σf/σf0=[1-2Δ(P·k1/2)/B0·t1/2]-1/4, and the velocity
of crack healing can be showed as: - Cv/t=(C2v0·ΔP)/(B0Cv)·1/2·(k/t)1/2. Reaction velocity constant, reaction time, the rate of volume increases due to reaction, and original crack size are four key factors of crack healing. The analysis of strength before and after crack healing proves the correctness of the crack-healing model.

Key words： crack healing; strength; velocity of healing; oxidiation reaction

Cite this article

Lü Jun , ZHENG Zhi-Xiang , WU Yu-Cheng , JIN Zhi-Hao . Kinetic Research of Oxidation Induced Crack Healing of Engineering Ceramics (Ⅱ) Model Testing: The Kinetic Research of Al2O3-TiC p Composite[J]. Journal of Inorganic Materials, 2006 , 21(2) : 508 -512 . DOI: 10.3724/SP.J.1077.2006.00508

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