Thermocouple Measurements of Heat Fluxes during Detonation Spraying

An experimental study was performed to investigate thermal processes during gas detonation spraying of coatings. Before impact on the target, particles of the sprayed material were accelerated to velocities of 300–500 m/s by the flow of detonation products of a gas mixture, whose temperature reached 4200°C. Due to intense heat transfer, the temperature of the particles increased. The highest quality coating was obtained at a heating temperature close to the melting point. Therefore, to estimate the heating temperature of the particles, we measured the heat fluxes from the detonation products of the gas mixture to their frontal and lateral surfaces using a method based on the Seebeck effect.