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Mechanical and interfacial properties of SiC fiber-reinforced SiC composites

Mechanical and interfacial properties of SiC fiber-reinforced SiC composites The interfacial strength of SiC/SiC composites fabricated by hot-pressing (HP) and CVI method was measured by push-in test, and the relation between interfacial and mechanical properties of the composites was investigated. Maximum strength and fracture energy of the CVI-composite was higher than those of the HP-composite due to lower interfacial shear sliding strength and higher fiber strength. The composite hot-pressed at 1750°C had a higher interfacial shear sliding strength, lower fiber strength, shorter fiber pull-out length and a smaller single fiber pull-out energy, resulting in low maximum strength and fracture energy. The composite hot-pressed at 1650°C showed a lower maximum strength and higher fracture energy in spite of a lower interfacial shear sliding strength, higher fiber strength, larger fiber pull-out length and a single fiber pull-out energy. In this case, the delamination between fiber and the matrix occurs easily. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Strength, Fracture and Complexity IOS Press

Mechanical and interfacial properties of SiC fiber-reinforced SiC composites

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Publisher
IOS Press
Copyright
Copyright © 2003 by IOS Press, Inc
ISSN
1567-2069
eISSN
1875-9262
Publisher site
See Article on Publisher Site

Abstract

The interfacial strength of SiC/SiC composites fabricated by hot-pressing (HP) and CVI method was measured by push-in test, and the relation between interfacial and mechanical properties of the composites was investigated. Maximum strength and fracture energy of the CVI-composite was higher than those of the HP-composite due to lower interfacial shear sliding strength and higher fiber strength. The composite hot-pressed at 1750°C had a higher interfacial shear sliding strength, lower fiber strength, shorter fiber pull-out length and a smaller single fiber pull-out energy, resulting in low maximum strength and fracture energy. The composite hot-pressed at 1650°C showed a lower maximum strength and higher fracture energy in spite of a lower interfacial shear sliding strength, higher fiber strength, larger fiber pull-out length and a single fiber pull-out energy. In this case, the delamination between fiber and the matrix occurs easily.

Journal

Strength, Fracture and ComplexityIOS Press

Published: Jan 1, 2003

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