Analysis of the effect of laser action modes on cold spray coatings based on Ti - B4C

The paper studies the combined method of production of Ti- and B4C-based metal-ceramic composite coatings which consists of the consequent coating deposition by of cold gas-dynamic spraying method (Cold spray) followed by the laser processing. The conditions of formation of metal-ceramic single tracks on the cold spray coating are discussed with due regard to laser action parameters. It is demonstrated that there is a pit in the single-track center at the high- power laser radiation. It is suggested that, against the diffusion, the convective mass transfer plays the key role in the track shape formation mechanism.