Erosive wear characteristic of Mo-TiN composite coatings on turbocharger compressor wheel using Taguchi experimental design

Abstract

In the present work, Mo coating (S1) and Mo-TiN coatings with varied compositions (S2: Mo-5 wt% TiN, S3: Mo-10 wt% TiN, and S4: Mo-15 wt% TiN) were deposited using atmospheric plasma spray system on to Al-Si substrate. The solid particle erosion wear response of these coatings was studied following Taguchi experimental design. The signal-to-noise ratio was analyzed to investigate the influence of oper-ating parameters (torch input power, erodent size, impact velocity, erodent temperature, impingement angle) on the erosion wear rate. In the case of Mo-coatings, erodent size is found to be the most influenc-ing parameter. However, with incorporation of TiN powder to the molybdenum matrix, torch input power level is playing a significant role. Erosion rate is found to be decreased with increasing torch input power in the range of 15-30 kW in Mo-TiN coatings. In Mo-10 wt% TiN coating (S3), the least erosion rate is observed at 30 kW. The surface morphology of the eroded coatings shows less micro-cracks in S3 coat-ing compared to others.Copyright (c) 2022 Elsevier Ltd. All rights reserved.Selection and peer-review under responsibility of the scientific committee of the International Confer-ence on Advances in Materials Processing.