Modelling of Combine Toughening in Whiskers and Transformation Combine Toughening Ceramics

Journal of Inorganic Materials

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Modelling of Combine Toughening in Whiskers and Transformation Combine Toughening Ceramics

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

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

Abstract

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 SiC_w/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

CLC Number:

TB323

SONG Gui-Ming,ZHOU Yu,SUN Yi,LEI Ting-Quan. Modelling of Combine Toughening in Whiskers and Transformation Combine Toughening Ceramics[J]. Journal of Inorganic Materials.

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Modelling of Combine Toughening in Whiskers and Transformation Combine Toughening Ceramics

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