Aluminum-silicon carbide coatings by plasma spraying |
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Authors: | K Ghosh T Troczynski A C D Chaklader |
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Affiliation: | (1) University of British Columbia, Vancouver, V6T 1Z4, BC, Canada |
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Abstract: | An aluminum base composite (Al-SiC) powder has been developed for producing plasma sprayed coatingson Al and other metallic
substrates. The composite powders were prepared by mechanical alloying
of 6061 Al alloy with SiC particles. The concentration of SiC was varied between 20 and 75 vol%, and the
size of the reinforcement was varied from 8 to 37 μm in the Al-50 vol%SiC composites. The 44 to 140 μm composite powders were
sprayed using an axial feed plasma torch. Adhesion strength of the coatings to their substrates were found to decrease with
increasing SiC content and with decreasing SiC particle
sizes. The increase in the SiC content and decrease in particle size improved the erosive wear resistance
of the coatings. The abrasive wear resistance was found to improve with the increase in SiC particle size
and with the SiC content in the composite coatings. |
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Keywords: | abrasion and erosion resistance mechanical alloying metal matrix composites (MMC) peel adhesion strength process control additives (PCA) |
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