Abstract:Short carbon-fibers were prepared by ball milling method and were subsequently mixed with alumi-na powders.The composite powders(4%carbon fiber)were plasma sprayed to form coatings.Microstructure and properties of the composite coatings were examined by field emission SEM,Raman spectroscopy,XRD,tensile adhesive test and wear test.Results show that carbon fibers remain almost intact after spraying,revea-ling their even distribution in the coatings.The presence of the carbon fibers at the interfaces between alumina splats result in enhanced adhesion by 38%.The coatings with addition of 4%carbon fibers show that the anti-wear performances significantly increases by 64%and the wear coefficient decreases by 50%.The improved anti-wear behavior is presumably attributed to the lubrication characteristics of carbon fiber and enhanced alu-mina splats’interfaces.This study gives clear insight into anti-wear applications of the coatings.
Key words:plasma spray;carbon fiber;composite coating;wear resistance
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