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

doi:10.3724/SP.J.1077.2006.00696

Abstract

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=(2πC²_v0·ΔP+F)/(2πB₀C_v)·1/2·(k/t)^1/2, and the strength recovery can be expressed by the following formula: σ_f/σ_f0=[1-(2πC²_v0·ΔP+F)/(πB₀C²_v0)·k^1/2·t^1/2]^-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

CLC Number:

TQ174

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, DOI: 10.3724/SP.J.1077.2006.00696.

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

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