EFFECT ON THE PROPERTIES OF CERAMIC COATINGS WHEN BLENDED AND SPRAYED USING HIGH VELOCITY OXYGEN FUEL PROCESS
Keywords:
RSM, protective coatings, thermal spray, HVOF, WC-Co/NiCrBSiAbstract
The aim of the present work is the investigation of sliding wear behaviour of two different coatings and study of the effect on the properties when they are blended. The mild steel samples were coated with the tungsten carbide/cobalt (WC-Co), nickel chromium boron silicon (NiCrBSi) and a blend of 30 % WC-Co and 70% NiCrBSi. The powders were sprayed using HVOF thermal spray process. The coatings were characterised with regard to porosity, adhesion tensile strength, micro hardness and microstructure. The sliding wear test of the coatings was performed by pin-on-disc apparatus and was analysed by Response Surface Methodology (RSM). To develop a wear model of coatings three factors temperature, load, sliding distance were used. ANOVA was carried out to determine the significant factors and interactions. The porosity of the specimens was determined by using the optical microscope. The coating morphology was studied by Scanning Electron Microscopy (SEM) and EDAX. The experiments have been subsequently analysed and assessed that the properties of WC-Co + NiCrBSi (blend) obtained are superior in all aspects to the other two basic coatings.
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