Substrate of improved plasma sprayed surface morphology

Details Substrate of improved plasma sprayed surface morphology Substrate of improved plasma sprayed surface morphology

C - Chemistry, Metallurgy

23

C

C23C 4/00 (2006.01) C23C 4/02 (2006.01) C23C 4/06 (2006.01) C23C 8/02 (2006.01) C23C 26/00 (2006.01) C23C 28/00 (2006.01) C23F 1/00 (2006.01) C25B 11/00 (2006.01) C25B 11/10 (2006.01) C25C 7/02 (2006.01) C25D 17/10 (2006.01)

Patent

CA 2056943

A metal surface is now described having enhanced adhesion of subsequently applied coatings. The substrate metal of the article, such as a valve metal as represented by titanium, is provided with a highly desirable surface characteristic for subsequent coating application. This can be achieved by a plasma sprayed coating of well defined surface morphology, the plasma spraying being with one or more metals usually valve metals. The metal of the coating may be the same or different from the metal of the substrate. Subsequently applied coatings, by penetrating into the coating of well defined surface morphology, and desirably locked onto the resulting metal article and provide enhanced lifetime even in rugged commercial environments.

Surface métallique assurant une adhérence accrue à des revêtements appliqués ultérieurement. Le support métallique d'une pièce, tel que le métal d'une soupape en titane, acquiert une caractéristique de surface hautement désirable pour l'application ultérieure de revêtements grâce à la présente invention. Il s'agit d'appliquer, par projection plasma, un revêtement dont la morphologie de la surface est bien définie, le revêtement consistant en un ou plusieurs métaux, habituellement des métaux de soupape. Le revêtement peut être constitué, ou non, du même métal que le support métallique. Les revêtements appliqués ultérieurement pénètrent dans le revêtement à morphologie de surface bien définie et se fusionnent à la pièce métallique, de sorte que la pièce dure plus longtemps, même dans des conditions d'usage commercial difficiles.

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