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Journal of Inorganic Materials

Journal of Inorganic Materials >

2006 , Vol. 21 >Issue 3: 696 - 700

DOI: https://doi.org/10.3724/SP.J.1077.2006.00696

Research Paper

Kinetic Research of Oxidation Induced Crack Healing of Engineering Ceramics (Ⅲ) Model Testing and Revising: The Kinetic Research of Al2O3-SiC W Composite

  • Lü Jun ,
  • ZHENG Zhi-Xian ,
  • WU Yu-Cheng ,
  • JIN Zhi-Hao
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  • 1. Materials Science and Engineering Institute, Hefei University of Technology,
    Hefei 230009, China;
    2. State Key Laboratory for Mechanical Behvior of Materials, Xi'an Jiaotong University, Xi'an 710049, China

Received date: 2004-12-02

  Revised date: 2005-02-06

  Online published: 2006-05-20

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Abstract

Oxidation reaction happened when Al2O3-SiC W composite heated at high temperature. The reaction producer moved to the crack area which induced crack healing. The kinetic analysis of crack healing of Al2O3-SiC W composite shows that: the velocity of crack healing can be showed as: - Cv/t=(2πC2v0·ΔP+F)/(2πB0Cv)·1/2·(k/t)1/2, and the strength recovery can be expressed by the following formula: σf/σf0=[1-(2πC2v0·ΔP+F)/(πB0C2v0)·k1/2·t1/2]-1/4. Compared with Al2O3-TiC P composite, the filling coefficient F was added. The physical meaning of F coefficient is the area equivalent except the crack area. For Al2O3-SiC W composite, F is related to the whisker bridge, whisker emerge, and the area on which reaction producer can follow and fill in the crack. When heated at 1200℃, F is about 9.94\times10-8 m2.

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

Cite this article

Lü Jun , ZHENG Zhi-Xian , WU Yu-Cheng , JIN Zhi-Hao . Kinetic Research of Oxidation Induced Crack Healing of Engineering Ceramics (Ⅲ) Model Testing and Revising: The Kinetic Research of Al2O3-SiC W Composite[J]. Journal of Inorganic Materials, 2006 , 21(3) : 696 -700 . DOI: 10.3724/SP.J.1077.2006.00696

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