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Strong Interface in CMCs, a Condition for Efficient Multilayered Interphases

Published online by Cambridge University Press:  15 February 2011

Christine Droillard ,
Jacques Lamon  and
Xavier Bourrat
Christine Droillard
Affiliation:
Laboratoire des Composites Thermostructuraux, Université de Bordeaux, Pessac, France
Jacques Lamon
Affiliation:
Laboratoire des Composites Thermostructuraux, Université de Bordeaux, Pessac, France
Xavier Bourrat
Affiliation:
Laboratoire des Composites Thermostructuraux, Université de Bordeaux, Pessac, France
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Abstract

A fiber treatment was used to change the bonding strength of the Nicalon NLM 202 SiC fiber from weak to strong, in a series of 2D-SiC/SiC composites with multilayered interphases. The materials with the pre-treated fibers were compared to the same materials but reinforced with as received fibers. The stress-strain behavior and the fracture toughness were examined as a function of crack patterns identified by TEM. All the materials could be grouped into two distinct families: (i) materials reinforced with untreated fibers have a weak fiber bonding and are characterized by a low strength and a low toughness and (2) materials with the pre-treated fibers have a strong fiber bonding and are characterized by a high strength and a high toughness. This latter behavior is identified by TEM. It corresponds to a new interfacial behavior with a cohesive mode of interfacial cracking, involving branching and deflection by the successive interfaces. In the former family, the adhesive interfacial failure mode corresponds to the classical debond/sliding mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 371
Copyright
Copyright © Materials Research Society 1995

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References

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