Ceramic Particle Dispersion Analysis in LASER Surface Alloying
|Periodical||Materials Science Forum (Volume 508)|
|Main Theme||Solidification and Gravity IV|
|Edited by||A Roósz, M. Rettenmayr and Z. Gácsi|
|Citation||Enikő Bitay, 2006, Materials Science Forum, 508, 295|
|Online since||March, 2006|
|Keywords||Laser Surface Alloying, Laser Surface Melting, Particle Dispersing, Solid Particle Penetration, Surface Treatment|
The present work aims to analyze the dispersion process (path) of the solid particles by moving a spherical particle from the feeding-nozzle outlet till the penetration of the melted surface (by the laser beam) and then its path in the metal bath. In laser surface treatment technologies with injection of hard particles in the melting bath it is necessary for the particles to work against the surface stress to penetrate through the surface of the bath into the melt. The theory shown was used in precalculations for the experiments carried out dispersing carbide particles (WC, TaC, NbC). Powder of particles of all three types were dispersed by means of the Ar carrying gas into an C15 steel melt by CO2 laser. Evaluating the results of this process taking into consideration different specific technological parameters (speed of the beam, powder feeding speed) one can conclude that all three carbide types can penetrate into the melt.