Abstract
Bulk cobalt- and nickel-based metallic materials exhibit superior resistance to cavitation erosion and sliding wear. Thus, thermally deposited High-Velocity Oxygen Fuel (HVOF) coatings seem promising for increasing the wear resistance of the bulk metal substrate. However, the effect of chemical composition on the cavitation erosion and sliding wear resistance of M(Co,Ni)CrAlY and NiCrMo coatings has not yet been exhaustively studied. In this study, High-Velocity Oxygen Fuel (HVOF) coatings such as CoNiCrAlY, NiCoCrAlY, and NiCrMoFeCo were deposited on AISI 310 (X15CrNi25-20) steel coupons. The microstructure, hardness, phase composition and surface morphology of the as-sprayed coatings were examined. Cavitation erosion tests were conducted using the vibratory method in accordance with the ASTM G32 standard. Sliding wear was examined with the use of a ball-on-disc tribometer, and friction coefficients were measured. The mechanism of wear was identified with the scanning electron microscope equipped with an energy dispersive spectroscopy (SEM-EDS) method. In comparison to the NiCrMoFeCo coating, the CoNiCrAlY and NiCoCrAlY coatings have a lower sliding and cavitation wear resistance.
Highlights
Bulk cobalt- and nickel-based metal alloys have superior resistance to both cavitation erosion and sliding [1,2,3,4,5]
High-Velocity Oxygen Fuel (HVOF) thermal spraying seems to be the step in increasing the wear resistance of bulk metal substrates
The effect of alloying composition on the cavitation erosion and sliding wear resistance of Ni-based coatings deposited by the HVOF method has not
Summary
Bulk cobalt- and nickel-based metal alloys have superior resistance to both cavitation erosion and sliding [1,2,3,4,5]. New studies on the abrasive wear of thermally deposited coatings are published, and even though these issues seem to be quite well-known there are relatively few scientific reports combining both sliding and cavitation testing of HVOF metallic coatings. The effect of alloying composition on the cavitation erosion and sliding wear resistance of Ni-based coatings deposited by the HVOF method has not. In comparison to other thermal spraying processes, e.g., plasma spraying or flame spraying, HVOF-deposited coatings exhibit low porosity and homogeneous structure. This is mainly due to the low process temperature and the high speed of the particles being sprayed [14,21,22]. The sliding and cavitation erosion wear resistance of NiCrMoFeCo, CoNiCrAlY and NiCoCrAlY coatings is investigated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
