Cavitation erosion of plasma-sprayed CoMoCrSi coatings

CoMoCrSi coatings were manufactured on a steel substrate by atmospheric plasma spraying (APS), followed by a three-hour heat treatment at a temperature of 800°C and 1000°C, respectively. Prior to the ultrasonic test of the cavitation erosion, coating cross-sections were observed by scanning electron...

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Bibliographic Details
Published in:Tribology international 2016-10, Vol.102, p.429-435
Main Authors: Wang, Yan, Liu, Jiangwei, Kang, Nan, Darut, Geoffrey, Poirier, Thierry, Stella, Jorge, Liao, Hanlin, Planche, Marie-Pierre
Format: Article
Language:English
Subjects:
Cavitation erosion
CoMoCrSi coating
Plasma spraying
Surface 3D profile
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Summary:CoMoCrSi coatings were manufactured on a steel substrate by atmospheric plasma spraying (APS), followed by a three-hour heat treatment at a temperature of 800°C and 1000°C, respectively. Prior to the ultrasonic test of the cavitation erosion, coating cross-sections were observed by scanning electron microscopy (SEM) and analyzed by X-ray diffraction (XRD). 3D profiles were employed to investigate the erosion mechanism on both pristine and eroded surfaces. As a result, it is shown that the heat treatment can significantly reduce the mean erosion depth of the CoMoCrSi coatings and the cavitation damages mainly consist of the removal of the splashes with weak adhesion during plasma spray and the delamination of fragments from bubble collapses. •CoMoCrSi coatings were manufactured by APS for protection against cavitation.•As sprayed coatings exhibit a dense microstructure with some surface defects.•Cavitation damage is characterized by the removal of splashes and delamination.•Cavitation resistance of the coatings is increased by means of thermal treatments.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2016.06.014