MCrAlY materials are widely used as coating materials operated under high temperature conditions owing to their excellent high temperature corrosion resistance. In this paper, the adhesive strength of high-velocity oxy-fuel (HVOF) MCrAlY coatings to superalloy substrate is quantitatively examined to clarify the effect of different annealing treatment conditions on the adhesion of the coating using three types of commercial MCrAlY powders. It is observed that the applied post-treatment atmosphere (nitrogen or air) has no significant influence on the reinforcement effect of the layer adhesion. On the basis of these results, it can be determined that HVOF-sprayed NiCrAlY layers have the ability to self-reinforce when post-heat treatments are below 1000 deg C. Paper includes a German-language abstract.

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