Abstract
A high-velocity oxygen-fuel (HVOF) system in air has been established for producing coatings that are extremely clean and dense. It is thought that the HVOF-sprayed MCrAlY (M is Ni, Co or both) coatings can resist oxidation and corrosion in the hot section of gas turbines. Also, it is known that in order to improve the residual stress coatings thicker than those from other thermal spraying systems can be sprayed. However, residual stress characteristics of HVOF coatings remain to be clarified. In this paper, the residual stress characteristics were analyzed using the deflection measurement technique and the X-ray technique. It was confirmed that the residual stress of HVOF coatings was reduced by the shot-peening effect. The generation mechanism of residual stress was investigated from the measurement results of deflection of cantilever specimens during HVOF spraying.
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