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Fracture behavior of Al2O3/SiC-platelet composites

Published online by Cambridge University Press:  31 January 2011

M. Belmonte ,
J. S. Moya ,
P. Miranzo ,
D. Nguyen ,
J. Dubois  and
G. Fantozzi
M. Belmonte
Affiliation:
Instituto de Cerámica y Vidrio, C.S.I.C, 28500 Arganda del Rey, Madrid, Spain
J. S. Moya
Affiliation:
Instituto de Cerámica y Vidrio, C.S.I.C, 28500 Arganda del Rey, Madrid, Spain
P. Miranzo
Affiliation:
Instituto de Cerámica y Vidrio, C.S.I.C, 28500 Arganda del Rey, Madrid, Spain
D. Nguyen
Affiliation:
GEMPPM, URA CNRS 341-INSA de Lyon, 20 Av. A. Einstein, 69921 Villeurbanne Cedex, France
J. Dubois
Affiliation:
GEMPPM, URA CNRS 341-INSA de Lyon, 20 Av. A. Einstein, 69921 Villeurbanne Cedex, France
G. Fantozzi
Affiliation:
GEMPPM, URA CNRS 341-INSA de Lyon, 20 Av. A. Einstein, 69921 Villeurbanne Cedex, France
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Abstract

Mechanical behavior of hot-pressed SiC platelet reinforced alumina composites has been analyzed as a function of SiC platelet content for two different alumina matrix powders. Fracture toughness and flexural strength at temperatures ranging from 25 to 1200 °C, R-curve behavior, and thermal shock resistance have been determined. Small differences in the impurity content of the starting Al2O3 powders strongly determine the microstructure and the mechanical behavior of Al2O3/SiC-platelet composites. Low alkali content alumina led to composites with large matrix grain size which presented spontaneous microcracking. At high temperature, a high viscosity liquid phase is formed that shields cracks enhancing mechanical properties and R-curve behavior. A small amount of impurities reduced Al2O3 matrix grain size and avoided spontaneous microcracking. Enhanced fracture toughness (up to 30%) at room temperature, R-curve behavior, and thermal shock resistance were achieved for these materials.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 10 , October 1996 , pp. 2528 - 2535
Copyright
Copyright © Materials Research Society 1996

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