Cavitation erosion resistance in NaCl medium of HVOF sprayed WC-based cermet coatings at various flow velocities: A comparative study on the effect of Ni and CoCr binder phases. (January 2021)

• Record Type: Journal Article
• Authors: Lin, Jinran; Hong, Sheng; Zheng, Yuan; Sun, Wei; Kang, Min; Fu, Xiuqing
• Is Part Of: International journal of refractory metals & hard materials. Volume 94(2021)
• Publication Date: 2021-01
• Subjects: Cavitation erosion -- Flow velocity -- HVOF -- Cermet coating; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2020.105407
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: High-velocity oxygen-fuel (HVOF) spraying was employed for depositing the WC-10Ni (WN) and WC-10Co-4Cr (WCC) powders in the form of coatings on 1Cr18Ni9Ti stainless steel substrate. In spite of higher elastic modulus ( E ) and hardness ( H ) as well as lower porosity, the WN coating showed higher values of H/E and H 3 /E 2 as well as resistance to CE at various flow velocities in NaCl medium in comparison with the WCC coating. WN and WCC coatings both showed an increment in the volume loss rates ( VLR ) in NaCl medium as the flow velocity increases. The change of the CE progresses in NaCl medium of the WN and WCC coatings at various flow velocities was compared and the CE mechanisms were revealed. Highlights: WC-10Ni and WC-10Co-4Cr coatings were prepared by HVOF spraying process. The change of cavitation erosion progresses at various flow velocities was studied. Cavitation erosion mechanisms of both coatings in NaCl medium were revealed. WC-Ni coating has higher cavitation erosion resistance at various flow velocities.