On the role of particle state and deposition procedure on mechanical, tribological and dielectric response of high velocity oxy-fuel sprayed alumina coatings

It is well known that the high velocity oxy-fuel based thermal spray process impart high density and reduced porosity in coatings compared to those produced by other ambient thermal spray processes. The benefits of HVOF have largely remained in the domain of metals and cermets and limited investigations have been carried out in ceramic coatings. The ability to produce high density ceramic coatings (e.g. alumina) offers potential in high performance applications in the field of wear, corrosion resistance, and dielectric coatings. However, due to extreme operational limits of the HVOF process, the fundamentals of process-structure-property relationships are not fully understood. In this paper, we report an integrated approach to establish processingmicrostructure-property correlations in order to optimize coatings for such