Laser method for generation of micro- and nano-particles and their selection in gas flow

Abstract

Laser cutting is a relatively simple and easily controlled method for material processing and is applied here for the generation of micro- and nanoparticles which can later be separated according their size in the flow of technological gas by using a filter system. The generation of particles is discused in the article when a steel strip of thickness of 0.2-0.6 mm is cut by pulsed Nd:YAG laser. The evaluation of changes in the chemical composition and size of the generated particles collected in the filter system is accomplished. Gas flow in the tube of smooth surface of the diameter of 30 mm is modeled when the distance between the generation and collection sites is 0.5, 1.0 and 3.0 m. The analysis of Moessbauer spectra is presented which show full or partial oxidation of particles being collected in different cascades of filters.