Thermal spray nozzle for producing rough thermal spray...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 4/12 (2006.01) B05B 7/22 (2006.01)

Patent

CA 2184603

Known thermal spray apparatus are modified to achieve rough thermal spray coatings. Thermal spray apparatus operate to develop a plasma stream for introduction to a nozzle, for eventual application to the surface of a substrate. Upon entering the nozzle, the plasma stream is passed through a plasma cooling zone defined by a plasma cooling passageway, to a plasma accelerating zone defined by a narrowed passageway that expands into a plasma/particle confining zone for the discharge of material from the apparatus. The narrowed passageway of the apparatus is cooled, and the powder material to be applied by the apparatus is introduced into the plasma stream along the cooled, narrowed passageway. For the appropriate heating (melting) and acceleration of MCrAlY powder particles, for application to the substrate which is to receive the thermal spray coating, the ratio of the initial (plasma cooling) passageway relative to the narrowed (plasma accelerating) passageway is reduced from the more conventional value of about 4:1 to a ratio of 2:1 or less.

On modifie des appareils de projection thermique connus pour en obtenir des revêtements bruts par projection thermique. Ces appareils de projection thermique produisent un courant de plasma qui passe par un ajutage pour être finalement appliqué sur la surface d'un substrat. En pénétrant dans l'ajutage, ce courant de plasma traverse une zone de refroidissement en forme de passage, puis une zone d'accélération de plasma définie par un passage étroit qui aboutit à une zone de confinement de plasma et de particules permettant l'éjection du matériau depuis un tel appareil. Le passage étroit de l'appareil est refroidi et le matériau poudreux à appliquer à l'aide de l'appareil est introduit dans le courant de plasma le long de ce passage étroit refroidi. Pour chauffer (ou faire fondre) et accélérer de manière appropriée des particules de poudre de MCrAlY en vue de leur application à un substrat devant recevoir ce revêtement de projection thermique, le rapport du passage initial (de refroidissement du plasma) au passage étroit (d'accélération du plasma) descend d'une valeur plus classique d'environ 4 à 1 à 2 à 1 ou moins.

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