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| Abstract No.: |
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Scheduled at:
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Thursday, May 05, 2022, Hall G2 11:00 AM
Wear Protection I
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| Title: |
Development of near net shaped coatings for reduced postprocessing costs in valves
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| Authors: |
Marvin Schulz* / RWTH Aachen University, Germany
Kirsten Bobzin / Surface Engineering Institute, Germany
Wolfgang Wietheger/ Surface Engineering Institute, Germany
Elisa Burbaum/ Surface Engineering Institute, Germany
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| Abstract: |
Thermally sprayed WC/CoCr coatings are established in the valve industry for wear protection. However, conventional coatings have to be cost-intensively postprocessed. Therefore, the aim of this study is to develop near net shaped (nns) WC/CoCr-coatings with a high wear resistance in order avoid the expensive grinding postprocess. For the development of the nns coatings a parameter study is used to investigate the influence of the stand-off distance and hydrogen volume flow rate in the HVAF process. The parameter study indicates the influence of the hydrogen volume flow and the stand-off distance on the porosity, microhardness and wear resistance of the coatings. The developed coatings exhibit a low porosity and high wear resistance. Through the correlation of the coating properties with the process parameters, promising parameter ranges for a further development of HVAF-sprayed nns coatings of WC/CoCr can be identified. With these results, first benchmarks for HVAF process parameters, hydrogen flow rate and stand-off distance could be delivered, advancing the overall goal of reducing manufacturing costs of valves.
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