In this study, MCrAlY-Al2O3 composite powders were produced by ball milling and deposited by plasma, HVOF, and cold spraying. The results show that Al2O3 fractions can be well controlled using composite powder due to non-preferential impact debonding of the matrix and Al2O3. The microstructure of spray powders is well retained in HVOF and cold-sprayed coatings due to the unmelted or partially molten condition of the spray particles. In the case of plasma-sprayed coatings, however, most Al2O3 particles segregate at lamellar interfaces, forming a continuous oxide scale on the splat. The cold-spray coatings exhibit the highest hardness due to the work hardening effect of kinetic deposition.

This content is only available as a PDF.
You do not currently have access to this content.