Temperature and Velocity Changes of ZrO2 Particles in the Process of HVOF Spraying by Twin-Combustion-Chamber Burner

This study aims to calculate the velocity and temperature of zirconium oxide (ZrO2) particles in the channel of a twin-combustion-chamber burner for high-velocity oxygen fuel (HVOF) spraying, specifically from the cutoff of the burner mixing chamber to the substrate. The calculations incorporated methylacetylene-allene fraction gas and oxygen as fuel components. The temperature and particle velocity were determined for ZrO2 particles with diameters of 20, 40, and 60 µm. Gas flow and particle parameters were calculated utilizing an established mathematical model. The model facilitates the determination of flow and particle parameters within the gas burner pathway and from the outlet section to the substrate. The experiment was conducted in two phases. During the first phase, the temperature and velocity of the gas stream from the burner inlet to the substrate were established. The second phase involved calculating the temperature and velocity of the particles based on the collected data. The results indicate that the thermal relaxation conditions for the sprayed material are significantly enhanced due to the burner’s original design, resulting in an expansion of the possibilities for controlling the spraying process. The scientific novelty is obtaining the velocity and temperature relationships of ZrO2 particles measuring 20, 40, and 60 µm during HVOF spraying in the twin-combustion-chamber burner channel and the segment-leading from the outlet to the substrate. The practical importance of these findings is their ability to inform the development of technological processes and recommendations for applying HVOF-sprayed wear-resistant coatings.