Abstract:In order to explore the effects of physical characteristics of spraying powder on flight characteristics of powder particles, Two thermal spray coatings, HVOF and APS, were used to prepare thermal barrier coatings with metal bonding layers. Meanwhile, the Spray Watch 2i camera was used to monitor the temperature and flight speed of the powder particles in real time during the spraying process. The relationship between the median particle size and loose density of powder particles and the velocity and temperature of particles in the flame beam was investigated. The experimental results show that the median particle size is inversely correlated with the temperature of flying particles. The larger the median particle size is, the smaller the temperature of flying particles is. In APS and HVOF with different jet velocity, the correlation between median particle size and flight velocity is different, In the HVOF beam with higher velocity, the larger the median particle size is, the higher the particle velocity is, but in the lower velocity APS beam, the particle velocity is independent of the median particle size. The particles in the HVOF beam have low temperature and high velocity. In plasma spraying, the velocity is basically constant and the temperature decreases with the increase of loose packing density.