PROCESS 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 ofparticles having different solidities and/or ductilities and to a cold-gassprayingdevice (11) suitable for use in said method. In order to obtain acomparatively highproportion of particles (23) having higher solidity and/or smaller ductilityincomparison to the other particles (22), the invention proposes that theseparticlesare fed into an area (21) of the stagnation chamber (15) of the cold-gassprayingdevice which is very distant from the nozzle (14). Advantageously, theparticles(23) have to cover a longer course through the stagnation chamber and are thuspreheated. In this way, the deposition of these particles (23) on a substrate(25) isimproved. Particularly metals having a transition temperature ranging betweenbrittle and ductile behaviour can be provided with ductile properties by meansofthe preheating process, thereby simplifying the deposition process.