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| Abstract No.: |
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Scheduled at:
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Thursday, September 29, 2011, Saal A 4:50 PM
Wear Protection 2
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| Title: |
Microstructure and mechanical properties of 7075 Al matrix SiC reinforced composite coatings produced by the cold gas dynamic spraying process
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| Authors: |
Onur Meydanoglu* / Istanbul Technical University
, Turkey
Bertrand Jodoin / University of Ottawa, Canada
E. Sabri Kayali/ Istanbul Technical University, Turkey
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| Abstract: |
In this study, microstructures and mechanical properties of 7075 Al alloy matrix and SiC reinforced composite coatings deposited on a T6 6061 Al alloy by cold spraying were investigated. Feedstocks were prepared as mixtures of 7075 Al alloy and SiC powders with SiC content between 0 to 40 vol. Microstructural characterization was carried out by optical and scanning electron microscopic examinations and X-ray diffraction (XRD) analysis. Mechanical behaviors of the coatings were determined by hardness measurements and wear tests. Wear tests were conducted under dry sliding wear testing conditions on a ball-on disc wear tester at normal atmospheric conditions. Presence of SiC improved the hardness and the wear resistance when compared to those of SiC free 7075 Al coating. Hardness of the coatings increased with increasing SiC content; while SiC content higher than 10 vol.% did not lead to further increase in wear resistance. In this respect, the optimum composition of the feedstock was determined as 90 vol. % 7075 Al + 10 vol. % SiC.
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