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Published October 1995 | public
Journal Article

Mechanical Behavior of Alumina Reinforced with Carbon-Coated Silicon Carbide Whiskers

Abstract

SiC whiskers with 0, 20, and 50 Å carbon coatings were incorporated into an alumina matrix to modify residual thermal stress and interfacial bonding. Composites were characterized using triaxial X-ray diffraction for residual stress determination and electron microscopy to explore interfacial chemistry. Fracture toughness and R-curve behavior were examined for short and long crack lengths. Uncoated SiC whiskers optimized strength, fracture toughness, and R-curve behavior of these composites. A graphite interphase at the whisker/matrix interface decreased contributions to crack bridging without promoting additional toughening by whisker pullout.

Additional Information

© 1995 The American Ceramic Society. Manuscript No. 194138. Received October 13, 1993; approved July 8, 1994. Based in part on the dissertation by T. E. Steyer for the Ph.D. degree in Materials Science and Engineering, Northwestern University, Evanston, IL, 1993. Supported by the Dow Chemical Co. and by the National Science Foundation under Grant No. DMR-9023629.

Additional details

Created:
August 20, 2023
Modified:
October 17, 2023