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SiC (SCS-6) fiber reinforced–reaction formed SiC matrix composites: Microstructure and interfacial properties

Published online by Cambridge University Press:  31 January 2011

M. Singh ,
R. M. Dickerson ,
Forrest A. Olmstead  and
J. I. Eldridge
M. Singh
Affiliation:
NYMA, Inc., Lewis Research Center Group, Cleveland, Ohio 44135
R. M. Dickerson
Affiliation:
NYMA, Inc., Lewis Research Center Group, Cleveland, Ohio 44135
Forrest A. Olmstead
Affiliation:
Department of Mechanical Engineering, Case Western Reserve University, Cleveland, Ohio 44106
J. I. Eldridge
Affiliation:
NASA Lewis Research Center, Cleveland, Ohio 44135
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Abstract

Microstructural and interfacial characterization of unidirectional SiC (SCS-6) fiber reinforced–reaction formed SiC (RFSC) composites has been carried out. Silicon–1.7 at.% molybdenum alloy was used as the melt infiltrant, instead of pure silicon, to reduce the activity of silicon in the melt as well as to reduce the amount of free silicon in the matrix. Electron microprobe analysis was used to evaluate the microstructure and phase distribution in these composites. The matrix is SiC with a bi-modal grain-size distribution and small amounts of MoSi2, silicon, and carbon. Fiber push-outs tests on these composites showed that a desirably low interfacial shear strength was achieved. The average debond shear stress at room temperature varied with specimen thickness from 29 to 64 MPa, with higher values observed for thinner specimens. Initial frictional sliding stresses showed little thickness dependence with values generally close to 30 MPa. Push-out test results showed very little change when the test temperature was increased to 800 °C from room temperature, indicating an absence of significant residual stresses in the composite.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 3 , March 1997 , pp. 706 - 713
Copyright
Copyright © Materials Research Society 1997

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