Method for feeding particles of a coating material into a...

C - Chemistry – Metallurgy – 23 – C

Patent

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

Patent

CA 2664595

The invention relates a method in which particles (25) are fed to a thermal spraying process in order to form a layer (24) on a part (21). In the thermal spraying process, the particles (25) are entrained by a carrier gas flow (23) and are deposited on a part (21) that is to be coated. According to the invention, the particles are dispersed in a liquid or solid additive before being introduced into a supply pipe (18) that extends into the thermal spraying device, and the additive is transferred into a gaseous state in the carrier gas flow after being discharged from the supply pipe. Hence, a liquid additive evaporates while a solid additive sublimates such that the particles (25) are individualized in the carrier gas flow. Dispersing the particles in the additive advantageously makes it easier to accurately meter the particles and prevents the particles from agglomerating, thus allowing improved layers to be deposited because the carrier gas flow is more homogeneous. Transferring the additive into a gaseous state prevents the additive from being deposited in the layer.

Procédé selon lequel des particules (25) sont introduites dans un processus d'application de revêtement par thermo-injection en vue de la formation d'une couche de revêtement (24) sur une pièce (21). Dans ce processus, lesdites particules sont entraînées par un flux de gaz porteur (23) et déposées sur une pièce à recouvrir (21). Selon la présente invention, avant d'être introduites dans une conduite d'amenée (18) débouchant dans le dispositif d'application de revêtement par thermo-injection, lesdites particules sont dispersées dans un additif liquide ou solide, ledit additif passant à l'état gazeux dans le flux de gaz porteur après avoir quitté la conduite d'amenée. Un additif liquide est vaporisé ou un additif solide sublimé, les particules (25) étant ainsi séparées dans le flux de gaz porteur. La dispersion des particules dans l'additif simplifie avantageusement un dosage précis et empêche l'agglomération des particules en grumeaux, si bien qu'une meilleure homogénéité du flux de gaz porteur permet le dépôt de couches améliorées. Grâce au passage de l'additif à l'état gazeux, ce dernier n'est pas déposé dans la couche.

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