Application and characterization of a kerosine-fuelled High Velocity Oxy-Fuel (HVOF) Ti2AlC coating on thermally stable P91 steel

Abstract

A class of ternary layered carbides and nitrides, known as MAX phases, combines some of the best properties of two distinct classes of materials: metals and ceramics. Specifically, MAX phases are stable at high temperatures, resist thermal shock, and some even form stable and protective oxide layers in oxidizing environments. Thus, they are excellent candidates for protective coatings in high-temperature applications. In this context, our focus is on using kerosene-fueled High-Velocity Oxy-Fuel spraying to deposit MAX phases onto P91 steel substrates for use as thermal barrier coatings. The chosen MAX phase for this study is Ti2AlC, which offers an outstanding oxidation resistance. Our results indicate that during the spraying procedure, a portion of the MAX phase decomposes, another portion oxidizes, yet more than half maintains the initial and desired stoichiometry. Nevertheless, the resulting coating establishes a stable and robust bond with the steel substrate. In this presentation, we will discuss the detailed analysis concerning the relationship between the process, structure, and performance of the Ti2AlC coating on the P91 steel substrate.