Modeling and Numerical Study of Light-propulsion Phenomena of Particles Acceleration in Coaxial Laser Powder Cladding

This work presents the results of investigation of heating and laser acceleration of powder particles in the lasercladding conditions. The model of reactive particles motion developed by the authors made a base for the numerical analysis of the laser particles acceleration. At the laser cladding, the light-propulsion force may be quite high, and powder particles may be accelerated up to several tens of meters per second and more. Numerical studies were carried out for two types of coaxial laser-powder nozzles. Powder feeding ways (symmetrical and asymmetrical), particles size and flow rate were varied. CO2-laser radiation had the wavelength of 10.6 μm, power up to 4.5 kW.Stainless-steel and aluminum-oxide powders werestudied.Comparability of the model calculation and experimental data is discussed.