Effect of Feed Rate and Impact Angle on the Erosive Wear of High Velocity Oxy-fuel Sprayed Coating Under High Temperature Conditions

摘要

In the present investigation erosive wear behavior of EWAC 1006 Co-base alloy deposited by high velocity oxy-fuel (HVOF) spraying process was investigated. The microstructure, porosity and hardness of the coating was evaluated. The effect of impact angles of 30°, 60° and 90° and erodent feed rate of 1, 3, 5 g/min on the erosive wear were evaluated. All erosive wear tests were conducted at high temperature (450°C) against erodent velocity of 40 m/s. The erosive wear was found to decrease with the increase in impact angle of the erodent and increase with the increase in erodent feed rate. The erosive wear of the coating was 3-4 times lower than the substrate. Analysis of the scanning electron microscope images revealed cutting and lip formation as the material removal mechanisms in these coatings under erosive wear conditions used in this investigation.