Abutment for a tubular component overlaid with a metallic composite deposit and method for making it

Abstract

The invention concerns an abutment for a tubular component, said abutment being overlaid with a coating comprising a principal layer constituted by an alloy selected from nickel-phosphorus alloys, copper-nickel alloys and nickel-tungsten alloys. The invention also concerns a tubular component comprising said abutment and a method for producing such an abutment.

Claims

1. An abutment for a tubular component, wherein the abutment is overlaid with a coating comprising a principal layer comprising a copper-nickel alloy and wherein the coating further comprises an underlay comprising a nickel-aluminium alloy wherein the coating further comprises an additional layer comprising a nickel-tungsten alloy, said additional layer being disposed on the principal layer.

2. The abutment according to claim 1, wherein a thickness of the principal layer is 5 to 35 m.

3. The abutment according to claim 1, wherein a thickness of the underlay is 1 to 3 m.

4. The abutment according to claim 1, wherein a thickness of said additional layer is 3 to 13 m.

5. The abutment according to claim 1, wherein the coating further comprises a lubricant layer on the additional layer.

6. The abutment according to claim 5, wherein the lubricant layer is selected from the group consisting of a grease, a semi-solid lubricant layer, and a solid, dry lubricant layer comprising one or more solid lubricant particles in a resin.

7. A tubular component, comprising the abutment of claim 1.

8. A method for obtaining the abutment of claim 1, the method comprising depositing the underlay, principal layer and additional layer by autocatalytic deposition, to obtain the abutment.

9. The method according to claim 8, further comprising treating the abutment at a temperature ranging from 250 C. to 550 C.

Description

(1) Some features are disclosed in more detail in the following description made with reference to the accompanying drawings.

(2) FIG. 1 is a diagrammatic view of a connection resulting from connecting two tubular components by makeup.

(3) FIG. 2 is an enlarged view of the zone in box A of FIG. 1.

(4) The threaded connection shown in FIG. 1 comprises a first tubular component with an axis of revolution 9 provided with a male end 1 and a second tubular component with an axis of revolution 9 provided with a female end 2. The two ends 1 and 2 each end in a terminal surface orientated radially with respect to the axis 9 of the threaded connection and are respectively provided with threaded portions 3 and 4 which cooperate together for mutual connection by makeup of the two components. In the threaded connection shown in FIG. 2, a portion of the threaded portion with a vanishing profile 10 does not cooperate with a complementary threading.

(5) As can be seen in FIG. 2, metal/metal sealing surfaces (bearing surfaces) 5, 6 intended to come into an interference sealing contact one against the other after connection of the two threaded components by makeup are respectively provided on the male and female ends close to the threaded portions 3, 4. The male end 1 ends in a terminal surface 7 which abuts against a corresponding surface 8 provided on the female end 2 when the two ends are made up one into the other. The surfaces 7 and 8 are termed abutments. In accordance with the invention, they are overlaid with a coating as defined above (not shown).