无机材料学报

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晶须和相变复合增韧陶瓷的复合增韧模型

宋桂明; 周玉; 孙毅; 雷廷权   

  1. 哈尔滨工业大学材料学院433信箱; 哈尔滨 150001
  • 收稿日期:1997-03-31 修回日期:1997-06-23 出版日期:1998-04-20 网络出版日期:1998-04-20

Modelling of Combine Toughening in Whiskers and Transformation Combine Toughening Ceramics

SONG Gui-Ming; ZHOU Yu; SUN Yi; LEI Ting-Quan   

  1. School of Materials; Harbin Institute of Technology Harbin 150001 China
  • Received:1997-03-31 Revised:1997-06-23 Published:1998-04-20 Online:1998-04-20

摘要: 建立了晶须和相变复合增韧陶瓷的复合增韧模型,其中晶须增韧考虑了裂纹桥联和裂纹偏转两种机理;相变增韧在考虑体膨胀作用的基础上,用切应变影响因子来考虑切应变增韧效应.计算结果表明,相变增韧、桥联增韧和裂纹偏转增韧存在相干性,相变增韧降低晶须增韧效果,而晶须增韧促进相变增韧效果,SiCw/ZrO2(2mol%Y2O3)/Al2O3断裂韧性的计算结果与实验结果吻合.

关键词: 复合增韧模型, 晶须增韧, 相变增韧, R-曲线, 陶瓷基复合材料

Abstract: A model of combine toughening in the ceramics toughened with whiskers and phase-transforming particles is presented. The whisker toughening consists of crack bridging and
crack deflection. For transformation toughening, the shear effect is considered by using a shear factor, f, based on the dilatation contribution. Calculated results show
that there are interactions among crack bridging, crack deflection and transformation toughening. Crack bridging and crack deflection increase the transformation toughening
contribution, but transformation toughening decreases the contributions of crack bridging and crack deflection. Predictions of the toughness of SiCw/ZrO2(2mol%Y2O3)/Al2O3
based on the present model are showed to be in good agreement with the experimental results.

Key words: combine toughening model, whisker toughening, transformation toughening R-curve, ceramic matrix composites

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