Tribo–Mechanical Properties of HVOF-Sprayed NiMoAl-Cr2AlC Composite Coatings.

Davis, D and Singha, Sintu and Chakradhar, RPS and Srivastava, Meenu (2020) Tribo–Mechanical Properties of HVOF-Sprayed NiMoAl-Cr2AlC Composite Coatings. Journal of Thermal Spray Technology, 29. pp. 1763-1783. ISSN 10599630

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The tribo-mechanical properties of NiMoAlCr2AlC MAX phase composite coatings on stainless steel substrate have been investigated. NiMoAl with different amounts of Cr2AlC (10, 20, 50 and 100 wt.%) were prepared by turbo-mixing and deposited by High-Velocity Oxy-Fuel (HVOF) method on stainless steel substrate. The phase composition, microstructure, chemical composition, tribological and mechanical properties of the coatings were analyzed using x-Ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Energy-Dispersive x-ray analysis (EDAX), pin-on-disk wear testing rig and nanohardness tester, respectively. The worn surfaces were analyzed by metallurgical optical microscope, FESEM and three-dimensional surface profiler to understand the wear behavior in detail. The addition of the Cr2AlC MAX phase in NiMoAl enhances the mechanical properties and reduces the surface roughness and porosity. NiMoAl-20 wt.% Cr2AlC and Cr2AlC coatings containing equal amounts of oxygen and carbon in the tribofilm show the low coefficient of friction (COF) and wear rate. The addition of the Cr2AlC MAX phase in the NiMoAl matrix up to 20 wt.% reduces the wear rate by one order of magnitude and enhances the coating life by 7000 twist fatigue cycles.

Item Type: Article
Uncontrolled Keywords: Cr2AlC MAX phase, HVOF coating, NiMoAl alloy, Tribology, twist fatigue
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
ENGINEERING > Fluid Mechanics and Thermodynamics
Depositing User: Mrs. Usha Kumari
Date Deposited: 18 Aug 2021 11:46
Last Modified: 18 Aug 2021 11:46

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