Cr₃C₂ -NiCr 涂层的制备及其抗高温冲蚀磨损性能

Waste incinerators are faced with a problem of sever high temperature erosion in service, and applying a protective coating is an effective method to protect them from erosion damage. To research the service performance of Cr₃ C₂ - NiCr coatings in the high temperature erosion environment in waste incinerator, Cr₃ C₂ - NiCr coatings were prepared using high velocity oxy - fuel spraying, the influence of spraying distance on coatings' microstructure was studied, and the high temperature erosion resistance of coatings was examined. Results indicated that with the increase of spraying distance, both the amount of unmelted particles on the coating surface and the porosity of coating increased. The coating had the highest proportion of melted particles when the spraying distance was 225 mm. In the high temperature erosion test, the erosion rate of coating increased and the high temperature erosion resistance decreased while the spraying distance increased. Besides, the high temperature erosion resistance of coating decreased when the temperature of erosion test increased from 450 ℃ to 550 ℃.