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7356 |
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Friday, May 06, 2022, Hall -2.32/33 9:20 AM Wear Protection II |
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Resistance against high temperature sliding wear of laser clad metallic coatings |
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Christiane Schulz / University of South Australia, Australia Colin J. Hall / University of South Australia, Australia Sukhpreet Kaur/ University of South Australia, Australia Anthony Roccisano/ Australian Research Council (ARC) Industrial Transformation Training Centre in Surface Engineering for Advanced Materials (SEAM), Australia Thomas Schlaefer*/ LaserBond Ltd., Australia |
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Laser cladding is today established as a modern coating process for application of wear and corrosion resistant claddings to protect components in extreme environments. Next to mechanical (wear) and chemical (corrosion) loads, components can also be exposed to high temperature. This adds a layer of challenge when suitable materials have to be selected. At elevated temperatures, some materials that are highly wear resistant at room temperature do undergo phase changes which greatly reduces their resistance to wear. In this study different Nickel and Cobalt based laser clad coatings as well as a Ni/WC composite coating and a mild steel reference were tested for their sliding wear resistance in a pin-on-disk setup at 600°C. Volume loss was determined directly using 3D profilometry. The resulting wear tracks were analysed by means of SEM to identify the dominant wear mechanism for each material. It was found that all metal alloy claddings performed better than the mild steel and Ni/WC references with the Co-based claddings outperforming the other investigated materials. The good performance of the Co-based materials is attributed to the formation of an oxide layer on these materials and a subsequent low coefficient of friction. |