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Hi-Nicalon fiber-reinforced celsian matrix composites: Influence of interface modification

Published online by Cambridge University Press:  31 January 2011

Narottam P. Bansal  and
Jeffrey I. Eldridge
Narottam P. Bansal*
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135–3191
Jeffrey I. Eldridge
Affiliation:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, Ohio 44135–3191
*
a) Address correspondence to this author.
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Extract

Unidirectional celsian matrix composites having 42–45 vol% of uncoated or BN-SiC coated Hi-Nicalon fibers were tested in three-point bend at room temperature. The uncoated fiber-reinforced composites showed catastrophic failure with strength of 210 ± 35 MPa and a flat fracture surface. In contrast, composites reinforced with coated fibers exhibited graceful failure with extensive fiber pullout. Values of first matrix cracking stress and strain were 435 ± 35 MPa and 0.27 ± 0.01%, respectively, with ultimate strength as high as 960 MPa. The elastic Young modulus of the uncoated and coated fiber-reinforced composites were 184 ± 4 GPa and 165 ± 5 GPa, respectively. Fiber push-through tests and microscopic examination indicated no chemical reaction at the uncoated or coated fiber-matrix interface. The low strength of composite with uncoated fibers is due to degradation of the fiber strength from mechanical damage during processing. Because both the coated- and uncoated-fiber-reinforced composites exhibited weak interfaces, the beneficial effect of the BN-SiC dual layer is primarily the protection of fibers from mechanical damage during processing.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 6 , June 1998 , pp. 1530 - 1537
Copyright
Copyright © Materials Research Society 1998

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