SIMULATION OF THE MODES AND SELECTION OF NEW PARTICLES WITH DIMENSIONS NOT EXCEEDING 250 NM AFTER LASER ABLATION OF VERTICALLY FALLING TITANIUM PARTICLES WITH SIZE RANGE OF 50-63 ΜICRONMETRES

摘要

The laser ablation method, based on the interaction of laser flux with metal surface, may beused to produce particles of metal alloys with sizes smaller than a micrometre. In this research, theinteraction of laser flux with the metal surfaces of spherical particles vertically falling at a constantspeed in an inert gas medium was simulated, using a developed mathematical model. Laser ablationmodes of spherical titanium particles were determined when particles were vertically falling at aconstant speed in argon and when their sizes were less than 100 μm. An experiment was performed,in which these modes were used to select new particles with sizes not exceeding 250 nm after laserablation of vertically falling spherical particles of titanium with a size range of 50–63 μm. It was shownthat the formulated phenomenological model can be used to calculate the modes of laser ablation ofultra-dispersed metal powders.