APPLICATION OF TAGUCHI-PARETO-DEMATEL METHOD TO OPTIMIZE THE THERMAL SPRAY HIGH-VELOCITY OXY-FUEL (HVOF) PROCESS PARAMETERS USING 67NI18CR5SI4B COATING

In contemporary technology, for the parameter of corrosion erosive wear, the responses of metal-based coatings such as FeCrCoAlTiB, FeCrNiSiB and 67Ni18Cr5Si4B among others, in high-velocity oxy-fuel spraying, have been investigated from both optimization and X-ray photo-electron spectroscopic perspectives. Notwithstanding, the expected utility of these perspectives, the interaction among the parameters of the spraying process is unexplored. Using data from the literature, this study presents a new method, the Taguchi-Pareto-DEMATEL method to capture interaction among the three key parameters of spray distance, velocity of spray and powder flow rate. The results show that the Taguchi-Pareto method exhibited an optimal parametric setting of S3V1P3, indicating 0.3 m of spray distance, 800 m/s of the velocity of spray and 50 g/min of powder flow rate. There is a concurrence of ranking in 33.3% of the instance where our ranks and Dinh et al.'s ranks conflicts as (2,1,3) and (2,3,1) for spray distance, the velocity of spray and powder flow rate, respectively. Furthermore, our results show that S, V and P are neutral along the net effect perspective. They are all equal from the prominence viewpoint. The contribution of this study is the exploration of parametric prioritization in combination with a method of analyzing the interdependence of the high-velocity oxy-fuel spraying parameters for the 67Ni28Cr5Si4B coating.