| SiCp/Al2O3 Ceramic Matrix Composites Prepared by Directed Oxidation of an Aluminium Alloy for
Wear Resistance Applications |
| M. Devaiah*, S. Santhosh Kumar, T. Srihari1 and T. Rajasekharan |
| Abstract |
| SiCp/Al2O3 ceramic matrix composites were fabricated using DIrected Metal OXidation (DIMOX) process. Continuous oxidation of an Al-Si-Mg-Zn alloy with appropriate dopants along with a preform of SiC particulate has led to the formation of alumina matrix surrounding silicon carbide particulates. The fabricated composites were investigated for wear resistance on a pin-on-disc tribometer against gray cast iron. Wear surfaces were examined under scanning electron microscope in order to identify the wear mechanisms involved. SiCp/Al2O3 matrix composites were found to possess enhanced mechanical properties such as flexural strength, fracture toughness and wear resistance, all at an affordable cost of fabrication. The superior high temperature resistance of SiCp/Al2O3 based ceramics makes them suitable for tribological applications above room temperature or in high speed non-lubricated sliding. |
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