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Mechanical Behavior of Alumina Reinforced with Carbon‐Coated Silicon Carbide Whiskers
Author(s) -
Steyer Todd E.,
Faber K. T.
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08039.x
Subject(s) - whisker , materials science , whiskers , composite material , monocrystalline whisker , silicon carbide , fracture toughness , graphite , residual stress , toughness , interphase , ceramic matrix composite , ceramic , genetics , biology
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.