Paper number 214


J. Pan1, M. Yoshida1, G. Sasaki1, H. Fukunaga1, and D. M. Yang2

1Department of Mechanical Engineering, Hiroshima University,
Kagamiyama 1-4-1, Higashi-Hiroshima, 739-8527, Japan
2Department of Materials Engineering and Applied Chemistry, Changsha Institute of Technology, Changsha, 410073, China

Summary Two kinds of SiC-based fibers have been evaluated for their compatibility with aluminum. Si-C-O (Nicalon) fiber and oxygen-free cured Si-C (Hi-Nicalon) fiber were coated with pure aluminum and heat treated at 700C for different times. Tensile test of Al-coated fibers showed that Si-C fiber had lower strength degradation than Si-C-O fiber. DSC thermogram displayed an exothermic peak as a proof of interface reaction between Si-C-O fiber and aluminum. SEM and TEM observation of SiC/Al composites exhibited that Si-C-O fiber reacted with aluminum more readily than Si-C fiber. Two kinds of SiC-based fiber reinforced aluminum composite wires were prepared by ultrasonic liquid infiltration method. After exposed at the temperature lower than 500C for 30 min the wire strength reduction was less than 10%. If heated at 600C and 700C, Si-C-O/Al wire lost its half strength and was near to zero, respectively. But for Si-C/Al wire, strength degradation was 20% (600C-30 min heating) and 88% (700C-30 min heating). Low-oxygen Si-C fiber has been improved in compatibility with aluminum.
Keywords SiC fiber, aluminum matrix composites, physical vapor deposition, squeeze casting, ultrasonic liquid infiltration, tensile strength, scanning electron microscopy, transmission electron microscopy.

Theme : Metal Matrix Composites

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