Cavitation erosion of plasma-sprayed CoMoCrSi coatings. (October 2016)

• Record Type: Journal Article
• Authors: Wang, Yan; Liu, Jiangwei; Kang, Nan; Darut, Geoffrey; Poirier, Thierry; Stella, Jorge; Liao, Hanlin; Planche, Marie-Pierre
• Is Part Of: Tribology international. Volume 102(2016)
• Page Start: 429
• Page End: 435
• Publication Date: 2016-10
• Subjects: Cavitation erosion -- CoMoCrSi coating -- Plasma spraying -- Surface 3D profile; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2016.06.014
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: 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. Highlights: 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.