| Résumé | Inner diameter high velocity oxygen fuel (ID-HVOF) thermal spraying is gaining increased attention as it offers new solutions for coating space restricted industrial parts where access with conventional HVOF torches is not feasible. Yet, challenges associated with using these newly developed torches have to be addressed for successful transitioning of ID-HVOF from an emerging thermal spray technology to an industrially viable process. Some of the challenges related to the compact size and low combustion powers of the ID-torches include spraying small size feedstocks at short standoff distances and controlling thermal load on the part.
In this study we used a kerosene fuel ID-HVOF system for development of cermet and metallic coatings. WC-10Co-4Cr and MCrAlX (M=Ni, Co and X=Y, HfSi) compositions were selected in the context of development of protective coatings for wear and corrosion protection of landing gear and downhole component inner cylinders and high temperature protection of small and complex parts of gas turbine engines, respectively as these applications could greatly benefit from the ID-spraying technology. The development of parameters space for coatings’ deposition as well as the effect of spray parameters and correlated particle temperature, velocity and surface temperature on the coatings’ microstructure and properties will be discussed. |
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