Evaluation method of materials under HVOF for thermal protection coating

This work has presented an evaluation technique, namely high velocity oxy-fuel (HVOF) thermal spraying system, to provide a supersonic flowing condition in which the temperature, heat flux, and speed are all sufficiently extreme to represent a more realistic environment of supersonic vehicles. Using these characteristics of the HVOF, we intend to proceed with characterization of the surface of the TPS materials applied to the aerospace field. The oxidation resistance of carbon composites under propane and oxygen flame is verified and the geometrical decomposition during the ablation process is examined in real time with recession monitoring system. The HVOF to be used for study showed the performance of the Mach number (2±0.5), heat flux (2~11 MW/m2), and flame temperature (2000±500℃) through previous research, which are enough to evaluate and monitor TPS materials. Through a combination of these conditions, it is possible to obtain results for the properties of materials of various geometric structure. In addition, we also refer to the evaluation techniques of the surface evolution for the recipe of the thermal protection coating process.