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

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

研究论文

结构陶瓷氧化反应裂纹愈合动力学研究(Ⅱ)模型验证: Al2O3-TiC p结构陶瓷裂纹愈合动力学研究

  • 吕珺 ,
  • 郑治祥 ,
  • 吴玉程 ,
  • 金志浩
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  • 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

  网络出版日期: 2006-03-20

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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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摘要

Al2O3-TiC p材料通过在高温下发生氧化反应, 生成物对裂纹处的填充迁移, 使裂纹产生愈合现象. 加热温度、保温时间、压痕载荷均对愈合效果产生影响. 对Al2O3-TiC p材料裂纹愈合动力学研究表明: 含裂纹材料强度的恢复符合公式:σf/σf0=[1-2Δ(P·k1/2)/B0·t1/2]-1/4, 愈合速度为- Cv/t=(C2v0·ΔP)/(B0Cv)·1/2·(k/t)1/2, 反应速率常数、反应时间、反应所带来的体积增加率, 裂纹初始尺寸是影响裂纹愈合的关键因素. 对Al2O3-TiC p材料裂纹愈合前后的强度变化分析证明了裂纹愈合模型的正确性

关键词： 裂纹愈合; 强度; 愈合速度; 氧化反应

本文引用格式

吕珺 , 郑治祥 , 吴玉程 , 金志浩 . 结构陶瓷氧化反应裂纹愈合动力学研究(Ⅱ)模型验证: Al2O3-TiC p结构陶瓷裂纹愈合动力学研究[J]. 无机材料学报, 2006 , 21(2) : 508 -512 . DOI: 10.3724/SP.J.1077.2006.00508

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

参考文献

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