Sliding Wear of Al2O3–SiC–(Al,Si) Composites against a Steel Counterface |
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| Authors: | A. Ravikiran Vikram Jayaram Sanjay K. Biswas |
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| Affiliation: | Department of Mechanical Engineering, Indian Institute of Science. Bangalore, India;Department of Metallurgy, Indian Institute of Science. Bangalore, India |
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| Abstract: | The sliding-wear behavior of Al2O3–SiC–Al composites prepared by melt oxidation against a steel counterface has been recorded in a pin-on-disk machine. At high speeds and pressures (10 m/s, 20 MPa), friction and wear appear to be principally controlled by the in-situ formation of an interfacial film that consists of a layer of Fe3O4. The formation of this film is examined as a function of sliding speed, lubrication, and composite microstructure. A model is proposed in which high surface temperatures cause the preferential extrusion of aluminum from the composite onto the pin/disk interface. This promotes the adhesive pickup of iron and its oxidation to form a stable tribologically beneficial layer of Fe3O4. |
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