Process and device for the cold gas spraying of particles...

C - Chemistry – Metallurgy – 23 – C

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C23C 4/12 (2006.01) C23C 24/04 (2006.01) C23C 24/08 (2006.01)

Patent

CA 2674762

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.

L'invention concerne un procédé de projection dynamique par gaz froid de particules de différente dureté et/ou ductilité, ainsi qu'un dispositif (1) de projection dynamique par gaz froid adapté audit procédé. L'invention vise à obtenir une teneur relativement élevée en particules (23) présentant une dureté accrue et/ou une ductilité réduite par rapport à d'autres particules (22). A cet effet, les particules sont introduites dans une zone (21) de la chambre de stagnation (15) du dispositif de projection dynamique par gaz froid, cette zone étant éloignée de la tuyère (14). Par conséquent, les particules (23) doivent avantageusement parcourir une plus grande distance à travers la chambre de stagnation et sont ainsi préchauffées. Il est alors possible d'améliorer la séparation de ces particules (23) sur un substrat (25). Le préchauffage permet de conférer des propriétés ductiles en particulier à des métaux dont la température de transition oscille entre un comportement cassant et ductile, ce qui facilite leur séparation.

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