Mathematical models for simulation of motion and heating of fine ceramic particles in plasma and laser spraying, as well as under conditions of a new technological process, i.e. hybrid laser-plasma spraying, are proposed. Trajectories, velocities and temperature fields of fine SiO 2 particles being sprayed using the argon plasma jet, CO 2 -laser beam and their combination have been calculated. It is shown that the space-time distribution of temperature in spray particles greatly depends upon the spraying method.

A computer model intended for modelling of subsonic turbulent plasma jets generated by plasma spray torches, as well as for simulation of spray particles behaviour in such jets is presented. Comparison of computer modelling and measurement results showed fairly good agreement.