Novel HVAF Coatings for Tribological Behaviour – A Review
Authors
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Department of Industrial Engineering and Management, Ramaiah Institute of Technology, Bengaluru, Karnataka ,IN
R Shobha -
Research Scholar, Department of Mechanical Engineering, Visvesvaraya Technological University, Belagavi, Karnataka ,ING J Naveen
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Department of Mechanical Engineering, Sambhram Institute of Technology, Bengaluru, Karnataka ,INP Sampathkumaran
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Material Technology Division, Central Power Research Institute, Bengaluru, Karnataka ,INR K Kumar
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Spraymet Surface Technologies, Bengaluru, Karnataka ,INP T Bindagi
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Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Bengaluru, Karnataka ,INP G Mukunda
DOI:
https://doi.org/10.18311/jmmf/2023/34786Keywords:
Wear, High Velocity Air Fuel (HVAF), Scanning Electron Microscope, Surface roughness, HardnessAbstract
The future scope of work lies in the development and comprehensive assessment of advanced coatings to resist wear, corrosion and abrasion of engineering components in harsh environments. Among them, thermal spray especially HVAF coatings occupy an important place in coating huge and complex parts which become techno-economically viable. Such exercise may not be possible in the traditional coating procedures including the powder metallurgy route. In general, a choice of the spray process, material selection, and design is as significant to benchmark thermal spray coatings. In most cases, thermally sprayed hard metal coatings are mechanically attached to substrates with thicknesses ranging from 100 to 500 microns. The current study gives an overview of the literature concerning HVAF coatings for tribological applications. It comprises HVAF coating developments and mechanisms followed by their application to different types of tribological performance such as sliding wear, erosion, abrasion, fretting and corrosion. HVAF coatings override other thermal spray coatings including HVOF and offer distinct advantages with respect to adherence and strength coupled with hardness so as to have strong resistance to wear, and corrosion integrated with deformation. The ingredients used in the process like metal carbides and metal alloys coated with combustible powders have a particle size in the range of a few nanometers to 60 microns. The researchers are now concentrating on the development and recognition of dense HVAF coatings so that they perform reliably and suitably in the field with good attributes. This article covers in-depth the deployed materials which are suitable for the HVAF process followed by an evaluation of physical, chemical, mechanical, and metallurgical characterization with the main focus on adhesive, abrasive, erosive, fretting and corrosive wear phenomena.
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