Thermal spraying method and apparatus

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 4/12 (2006.01) C23C 4/10 (2006.01) B05B 7/22 (2006.01)

Patent

CA 2259190

A thermal metal spraying method involves the creation of a coating comprising titanium nitride by atomising titanium wire in the presence of nitrogen. The apparatus of the invention comprises a nozzle which has a cylindrical throat, with feedstock guides which guide the feedstock wires to a point of intersection in the throat. A current is passed through the wires to cause an arc in the throat, and a nitrogen rich gas under pressure is forced through the throat, generating a spray of molten particles which is used to coat a substrate. In a variation of the method, one of the feedstock wires comprises a binder metal, which produces a coating having enhanced toughness.

Méthode de vaporisation thermique impliquant la création d'un revêtement de nitrure de titane par atomisation d'un fil de titane en présence d'azote. L'appareil de l'invention comprend une buse possédant une gorge cylindrique avec des guides de matière de départ qui dirigent les fils de matière de départ vers un point d'intersection situé dans la gorge. On fait passer par les fils un courant générant un arc dans la gorge et on force dans ladite gorge un gaz sous pression riche en azote, générant ainsi une vapeur de particules en fusion qui sont employées pour enduire un support. Dans une variante de la méthode, on ajoute à l'un des fils de matière de départ un métal liant qui produit un revêtement d'une dureté renforcée.

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