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Abstract

This work evaluates the influence of processing parameters on the adhesion and morphology of a NiWCrBSi commercial alloy thermally sprayed using HVOF. A 3³ factorial design experiment was used to establish the effects of the variables on coating quality. The equivalence fuel/oxygen ratio F_i, defined as the ratio [(F/O)_working/(F/O)_{stoichiometric}], was varied between 0·8 and 1·2, the spraying distance was varied between 380 and 570 mm, and the powder feedrate was varied between 60 and 120 g min^-1. Response surface methodology was used to describe the empirical relationships among the parameters studied. The tensile bond strength was evaluated following ASTM C 633. Scanning electron microscopy, coupled with X-ray microanalysis, was employed to characterise the fractured surfaces after the test and to determine the fracture mode. The results indicated that the equivalence ratio F_i and the spraying distance were the main processing parameters which affected adhesion strength and the coating properties.

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Effects of HVOF Parameters on Adhesion and Microstructure of Thermal Sprayed NiWCrBSi Coatings

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