METHOD AND DEVICE FOR THE COLD-GAS SPRAYING OF PARTICLES HAVING DIFFERENT SOLIDITIES AND/OR DUCTILITIES

摘要

The invention relates to a method for the cold-gas spraying of particles having different solidities and/or ductilities and to a cold-gas spraying device (11) suitable for use in said method. In order to obtain a comparatively high proportion of particles (23) having higher solidity and/or smaller ductility in comparison to the other particles (22), the invention proposes that these particles are fed into an area (21) of the stagnation chamber (15) of the cold-gas spraying device which is very distant from the nozzle (14). Advantageously, the particles (23) have to cover a longer course through the stagnation chamber and are thus preheated. In this way, the deposition of these particles (23) on a substrate (25) is improved. Particularly metals having a transition temperature ranging between brittle and ductile behaviour can be provided with ductile properties by means of the preheating process, thereby simplifying the deposition process.