(19)
(11)EP 3 052 675 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
13.01.2021 Bulletin 2021/02

(21)Application number: 14762003.3

(22)Date of filing:  11.09.2014
(51)International Patent Classification (IPC): 
C23C 18/16(2006.01)
C23C 18/50(2006.01)
F16L 58/08(2006.01)
F16L 25/00(2006.01)
C23C 18/32(2006.01)
E21B 17/042(2006.01)
F16L 58/18(2006.01)
F16L 15/00(2006.01)
(86)International application number:
PCT/EP2014/069363
(87)International publication number:
WO 2015/049098 (09.04.2015 Gazette  2015/14)

(54)

ABUTMENT FOR A TUBULAR COMPONENT OVERLAID WITH A METALLIC COMPOSITE DEPOSIT AND METHOD FOR MAKING IT

WIDERLAGER FÜR EINE RÖHRENFÖRMIGE KOMPONENTE ÜBERLAGERT MIT EINER METALLISCHER KOMPOSITBESCHICHTUNG UND VERFAHREN ZUR HERSTELLUNG

BUTEE POUR ÉLÉMENT TUBULAIRE RECOUVERT D'UN DÉPÔT MÉTALLIQUE COMPOSITE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 02.10.2013 FR 1359529

(43)Date of publication of application:
10.08.2016 Bulletin 2016/32

(73)Proprietors:
  • Vallourec Oil and Gas France
    59620 Aulnoye-Aymeries (FR)
  • Nippon Steel Corporation
    Tokyo 100-8071 (JP)

(72)Inventors:
  • MILLET, Cécile
    F-59670 La Longueville (FR)
  • DAVID, Didier
    F-59530 Ruesnes (FR)

(74)Representative: Casalonga 
Casalonga & Partners Bayerstraße 71/73
80335 München
80335 München (DE)


(56)References cited: : 
JP-A- H0 571 525
JP-A- S58 193 355
US-A1- 2011 042 069
JP-A- H06 323 326
US-A- 5 308 660
US-A1- 2011 162 751
  
  • DATABASE WPI Week 200930 Thomson Scientific, London, GB; AN 2009-H16509 XP002726019, & CN 201 209 407 Y (CHANGSHA HI TECH IND DEV ZONE YINGCAI TECHNOLOGY CO LTD) 18 March 2009 (2009-03-18)
  • DATABASE WPI Week 200748 Thomson Scientific, London, GB; AN 2007-483014 XP002726020, & CN 1 896 452 A (ANDONGAOER ENG TECHNOLOGY CO LTD) 17 January 2007 (2007-01-17)
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description


[0001] The present invention relates to an abutment for a tubular component, said abutment being overlaid with a particular metallic composite coating.

[0002] The term "tubular component" as used in the present invention means any element or accessory used to drill or operate a well.

[0003] A tubular component is intended to be connected via one or more connection elements, in particular a threading, a sealing surface and an abutment, to another tubular component in order to constitute a threaded tubular connection with that other tubular component. The tubular component may, for example, be a relatively long tube (in particular approximately ten metres in length), a tubular coupling a few tens of centimetres in length, an accessory for such tubes (a suspension device or hanger, a part for adapting cross-sections, or cross-over, a safety valve, a drill pipe connector or tool joint, a sub, and the like).

[0004] The tubular components are generally connected one with another for dropping into the hydrocarbon well or similar well and to constitute a drill stem, a casing string or a liner or tubing string, or indeed an operating string.

[0005] API specification 5CT issued by the American Petroleum Institute (API), equivalent to ISO standard 11960 : 2004 issued by the International Standardisation Organisation (ISO) governs the specifications for tubes used as casing or tubing, and API specification 5B defines standard threadings for such tubes. API specification 7 defines threaded connectors with a shoulder for rotary drill pipes.

[0006] Over the last 20 years, drilling conditions and the drilling environment have become more complex because of the need to search further afield for oil. Drill stems have increased in length, along with the loads to which they are subjected: they need to transmit more torque from the surface to the drill head, and they need better tensile performance and anti-corrosion resistance.

[0007] In order to satisfy those needs, novel threaded connections known as premium connections located at each end of each tube composing that drill stem have been produced. They principally comprise a secondary internal abutment which means that their torsion resistance can increase compared with conventional API connections. This is known as a double abutment connection.

[0008] One of the particular features of such a premium connection is that it is more sensitive, since the profile of the additional abutment (or internal abutment) means that it is more exposed to knocks and impacts occurring during handling of the pipes when stored on the drilling platform or at the base, or during the operation for bringing the load flank of the thread into contact.

[0009] Although in the context of using single abutment connections (API connection) it is possible to repair them on site using a refacing device designed for this purpose, this machine and practice cannot be employed with double abutment connections. The dimensional and geometric tolerances between the internal and external abutments are so tight that repair can only be carried out on a lathe, and thus no longer on site, but in a repair shop. The repair and the down time will generate high costs, higher than those generated when using API connections.

[0010] Thus, there is a genuine need for providing abutments which perform well in terms of hardness in order to reduce the sensitivity of such abutments to shocks.

[0011] It is also necessary for the abutments to have good corrosion resistance properties. The utility model CN201209407Y discloses a collar body plated with a Fe-Ni-W alloy or a Ni-W-P alloy. As a primer, the collar body may comprise an iron-nickel alloy plating layer between a coupling body and said Fe-Ni-W alloy or Ni-W-P alloy.

[0012] Thus, 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 and characterized in that the coating further comprises an underlay constituted by an alloy selected from nickel-aluminium alloys.

[0013] The thickness of said principal layer is advantageously in the range 5 to 35 µm.

[0014] In accordance with a first preferred embodiment, the principal layer is constituted by a nickel-phosphorus alloy.

[0015] The phosphorus generally represents 5% to 13%, preferably 8% to 13%, more preferably 10% to 12% by weight of the total weight of the nickel-phosphorus alloy.

[0016] When the principal layer is constituted by a nickel-phosphorus alloy, the thickness of said principal layer is advantageously in the range 10µm to 60µm, preferably from 20µm to 35 µm, more preferably 25 µm to 30 µm.

[0017] Tests carried out with an abutment of a tubular element overlaid with a coating with a thickness from 35µm to 60µm were concluded with absence of galling during make-up of components.

[0018] Tests carried out with an abutment of a tubular element overlaid with a coating with a thickness from 20µm to 35µm were concluded with absence of galling during make-up of component, and furthermore no appareance of micro-cracks which can be deleterious to corrosion resistance.

[0019] In accordance with a second preferred embodiment, the principal layer is constituted by a nickel-tungsten alloy.

[0020] The tungsten generally represents 5% to 15% by weight of the total weight of the nickel-tungsten alloy.

[0021] When the principal layer is constituted by a nickel-tungsten alloy, the thickness of the principal layer is preferably in the range 5 to 20 µm, more preferably 5 to 15 µm.

[0022] Such a nickel-phosphorus alloy layer has been proposed by MACDERMID under the trade name NIKLAD XD7647.

[0023] The coating for the abutment of the invention may also comprise an underlay constituted by an alloy with a greater ductility than the ductility of the principal layer. The underlay is constituted by an alloy selected from nickel-aluminium alloys.

[0024] Advantageously, this underlay can be used to preserve the anti-corrosion function of the coating. In fact, since the principal layer has a low ductility, it might crack when the abutment is under load. The underlay with a greater ductility will not crack to the same extent and thus will constitute a supplemental obstacle to corrosive agents.

[0025] Preferably, the thickness of the underlay is in the range 1 to 3 µm.

[0026] The coating of the abutment of the invention may also further comprise an additional layer which is distinct from the principal layer, constituted by an alloy selected from nickel-phosphorus alloys comprising particles of one or more solid lubricant compounds, nickel-tungsten alloys, said additional layer being disposed on said principal layer.

[0027] Preferably, the additional layer is constituted by an alloy selected from nickel-phosphorus alloys comprising particles of one or more solid lubricant compounds.

[0028] A solid lubricant is a solid and stable substance which is interposed between two friction surfaces in order to reduce the coefficient of friction and to reduce wear and damage to the surfaces.

[0029] In the present invention, however, an increase in the friction or hardness is desired in order to be able to increase the torque which can be transmitted between the abutments. Thus, the additional lubricants can be used for adjusting by reducing the values of the torques which can be transmitted from abutment to abutment.

[0030] These substances can be classified into various categories defined by their functional mechanism and their structure. These categories are described, for example, in the handouts entitled "Les lubrifiants solides[Solid lubricants]" issued by M. Eric Gard at the Ecole Nationale Superieure des Pétroles et Moteurs (France):
  • class 1: solid substances owing their lubricating properties to their crystalline structure, for example graphite, boron nitride BN or zinc oxide ZnO;
  • class 2: solid substances owing their lubricating properties on the one hand to their crystalline structure and on the other hand to a reactive chemical element in their composition, for example molybdenum disulphide MoS2, graphite fluoride, tin sulphides or bismuth sulphides;
  • class 3: solid substances owing their lubricating properties to their chemical reactivity, for example certain chemical compounds of the thiosulphate type (for example Desilube 88 marketed by Desilube Technology Inc.);
  • class 4: solid substances owing their lubricating properties to a plastic or viscoplastic behaviour under frictional load, for example polytetrafluoroethylene (PTFE), or polyamides.


[0031] Silicon carbide and tungsten carbide may also be cited.

[0032] The particles of one or more solid lubricant compounds are advantageously selected from particles of polytetrafluoroethylene, talc, mica, boron nitride, silicon carbide, tungsten carbide, tungsten sulphide, molybdenum sulphide and mixtures thereof.

[0033] Preferably, the particles of one or more solid lubricant compounds are selected from polytetrafluoroethylene particles.

[0034] Advantageously, the phosphorus of the nickel-phosphorus alloy comprising particles of one or more solid lubricant compounds represents 5% to 13%, preferably 8% to 13%, more preferably 10% to 12% by weight of the total weight of the nickel-phosphorus alloy comprising particles of one or more solid lubricant compounds.

[0035] The particles of one or more solid lubricant compounds advantageously represent 20% to 35% by volume, preferably 25% to 30% by volume with respect to the total volume of the nickel-phosphorus alloy comprising particles of one or more solid lubricant compounds.

[0036] A nickel-phosphorus alloy layer of this type comprising polytetrafluoroethylene particles has been proposed by MACDERMID under the trade name NIKLAD ICE Ultra.

[0037] The thickness of said additional layer can be in the range 3 to 13 µm, preferably 5 to 10 µm.

[0038] Furthermore, the coating may comprise a lubricant layer disposed on said principal layer or on said additional layer when the coating comprises said additional layer.

[0039] The lubricant layer may be selected from a grease, a semi-solid lubricant layer or a solid, dry lubricant layer comprising one or more solid lubricant particles in a resin.

[0040] The semi-solid lubricant layer generally comprises one or more extreme pressure additives, one or more solid lubricant particles, one or more metallic soaps and one or more low melting point waxes. Such semi-solid lubricant layers are described, for example, in patent application FR 2 937 046.

[0041] The solid, dry lubricant layer generally comprises one or more solid lubricant particles for reducing friction in a resin binder such as an organic or inorganic polymer, selected from heat curable epoxy; polyurethane; unsaturated polyester; polyphenylsulphone; polyimide and silicone resins; thermoplastic polyolefin, olefin copolymer, polyamide, polyamide-imide, polyaryletherketone resins; alkaline polysilicates with a SiO2/MxO ratio of more than 2, where M=Na, K or Li; organometallics such as alkoxy-titanates or ethyl silicate.

[0042] The invention also pertains to a tubular component comprising an abutment in accordance with the invention.

[0043] More particularly, the tubular component of the invention is produced from steel, in particular steels such as those described in API 5CT standards, for example those comprising carbon in a proportion of less than 0.25%, and/or preferably, steels with a grade such as those defined in the standards ISO11960 and ISO13680 and/or a H40, J55, K55, M65, L80, C90, C95, T95, P110, Q125, S135, V150 carbon steel or a 13Cr or S13Cr or Duplex 22Cr + 25Cr or Super-Duplex 25Cr martensitic steel, or a Fe 27Cr austenitic steel.

[0044] The invention also concerns a method for producing a connection element as defined above, in which the principal layer and optional additional layer are deposited by autocatalytic deposition. This method allows to obtain comparatively to an electrolytic deposition, a coating of which thickness, chemical properties and mechanical properties are more uniform, despite complex shapes of the surface to overlaid, as are the surfaces of abutments or threading.

[0045] The principal layer used in accordance with the invention may be deposited on the connection element by autocatalytic deposition. In particular, autocatalytic deposits of nickel-phosphorus alloy are described in NF standard EN ISO 4527, as well as in the document by Louis LACOURCELLE - Nickelage chimique [Chemical nickeling], Techniques de l'Ingenieur, Metallic materials essay.

[0046] Autocatalytic deposits of nickel-phosphorus alloy are proposed by MACDERMID under the trade name NIKLAD™ ELV.

[0047] Autocatalytic deposits of nickel-tungsten alloy have been proposed by SIFCO under the trade name of Nickel-Tungsten code 5711.

[0048] The additional layer which is optionally used in accordance with the invention may be obtained by autocatalytic deposition.

[0049] In particular, autocatalytic deposits of nickel-phosphorus alloy containing particles of polytetrafluoroethylene have been proposed by MACDERMID under the trade name NIKLAD™ ICE ULTRA.

[0050] Deposition of the principal layer used in accordance with the invention, of any optional underlay used in accordance with the invention and any additional layer which might be used in accordance with the invention may be carried out using an autocatalytic method comprising the following steps:
  • cleaning the surface of the connection element; cleaning may be carried out by alkaline degreasing, then rinsing, then electrolytic degreasing, then rinsing, then acid stripping, then rinsing; then:
  • depositing the underlay; then
  • depositing the principal layer, then depassivating the surface, then optional deposition of the additional layer, then rinsing; then
  • oven drying, for example at a temperature of the order of 70°C; then
  • a degassing treatment in an oxidizing atmosphere, typically for 2h at 220°C.


[0051] This method may also include a posterior heat treatment at a temperature which is preferably in the range 250°C to 550°C, preferably from 350°C to 400°C, more preferably of the order of 400°C, for example for a period of 3 to 5 h.

[0052] This posterior heat treatment can be used to increase the hardness of the coating.

[0053] Alternatively, deposition of the principal layer used in accordance with the invention and of the additional layer which is optionally used in accordance with the invention may be carried out using an electrolytic method. When such an electrolytic method is used, it is necessary to deposit an underlay as defined above. Thus, the electrolytic method comprises the following steps:
  • cleaning the surface of the connection element; cleaning may be carried out by alkaline degreasing, then rinsing, then electrolytic degreasing, preferably acid-based, then rinsing; then:
  • depositing an underlay with a thickness in the range 1 to 3 µm; then
  • depositing the principal layer, then depassiviating the surface, then optional deposition of the additional layer, then rinsing; then
  • posterior heat treatment at a temperature which is preferably in the range 250°C to 550°C, preferably of the order of 400°C, for example for a period of 1h to 5h.


[0054] This posterior heat treatment step can be used to increase the hardness of the coating.

[0055] Some features are disclosed in more detail in the following description made with reference to the accompanying drawings.

Figure 1 is a diagrammatic view of a connection resulting from connecting two tubular components by makeup.

Figure 2 is an enlarged view of the zone in box A of Figure 1.



[0056] The threaded connection shown in Figure 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 Figure 2, a portion of the threaded portion with a vanishing profile 10 does not cooperate with a complementary threading.

[0057] As can be seen in Figure 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).


Claims

1. 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, characterized in that the coating further comprises an underlay constituted by an alloy selected from nickel-aluminium alloys.
 
2. An abutment according to claim 1, characterized in that the thickness of said principal layer is in the range 5 to 35 µm.
 
3. An abutment according to claim 1, characterized in that the principal layer is constituted by a nickel-phosphorus alloy.
 
4. An abutment according to claim 3, characterized in that the phosphorus represents 5% to 13%, preferably 8% to 13%, more preferably 10% to 12% by weight of the total weight of the nickel-phosphorus alloy.
 
5. An abutment according to claim 3 or claim 4, characterized in that the thickness of the principal layer is in the range 10 to 60 µm, preferably 20 to 35 µm, more preferably 25 to 30 µm.
 
6. An abutment according to claim 1, characterized in that the principal layer is constituted by a nickel-tungsten alloy.
 
7. An abutment according to claim 6, characterized in that the tungsten represents 5% to 15% by weight of the total weight of the nickel-tungsten alloy.
 
8. An abutment according to claim 6 or claim 7, characterized in that the thickness of the principal layer is in the range 5 to 35 µm, preferably 5 to 20 µm, more preferably 5 to 15 µm.
 
9. An abutment according to any one of the preceding claims, characterized in that the thickness of the underlay is in the range 1 to 3 µm.
 
10. An abutment according to any one of the preceding claims, characterized in that the coating further comprises an additional layer constituted by an alloy selected from nickel-phosphorus alloys comprising particles of one or more solid lubricant compounds, and nickel-tungsten alloys, said additional layer being disposed on said principal layer.
 
11. An abutment according to claim 10, characterized in that the particles of one or more solid lubricant compounds are selected from particles of polytetrafluoroethylene, talc, mica, boron nitride, silicon carbide, tungsten carbide, tungsten sulphide, molybdenum sulphide and mixtures thereof.
 
12. An abutment according to claim 10 or claim 11, characterized in that the phosphorus of the nickel-phosphorus alloy comprising the particles of one or more solid lubricant compounds represents 5% to 13%, preferably 8% to 13%, more preferably 10% to 12% by weight of the total weight of the nickel-phosphorus alloy comprising the particles of one or more solid lubricant compounds.
 
13. An abutment according to any one of claims 10 to 12, characterized in that the particles of one or more solid lubricant compounds represent 20% to 35% by volume, preferably 25% to 30% by volume with respect to the total volume of the nickel-phosphorus alloy comprising the particles of one or more solid lubricant compounds.
 
14. An abutment according to any one of claims 10 to 13, characterized in that the thickness of said additional layer is in the range 3 to 13 µm, preferably 5 to 10 µm.
 
15. An abutment according to any one of the preceding claims, characterized in that the coating comprises a lubricant layer disposed on said principal layer or on said additional layer when the coating comprises said additional layer.
 
16. An abutment according to claim 15, characterized in that that the lubricant layer is selected from a grease, a semi-solid lubricant layer or a solid, dry lubricant layer comprising one or more solid lubricant particles in a resin.
 
17. A tubular component comprising an abutment as defined in any one of the preceding claims.
 
18. A method for obtaining an abutment as defined in any one of claims 10 to 16, characterized in that the principal layer and the optional additional layer are deposited by autocatalytic deposition.
 
19. A method according to claim 18, characterized in that it comprises a posterior treatment step at a temperature in the range 250°C to 550°C.
 


Ansprüche

1. Stoß für eine röhrenförmige Komponente, wobei der Stoß mit einer Beschichtung beschichtet ist, die eine Hauptschicht umfasst, die von einer Legierung gebildet wird, die ausgewählt ist aus Nickel-Phosphor-Legierungen, Kupfer-Nickel-Legierungen und Nickel-Wolfram-Legierungen, dadurch gekennzeichnet, dass die Beschichtung ferner eine Unterlage umfasst, die von einer Legierung gebildet wird, die aus Nickel-Aluminium-Legierungen ausgewählt ist.
 
2. Stoß nach Anspruch 1, dadurch gekennzeichnet, dass die Dicke der Hauptschicht im Bereich von 5 bis 35 µm liegt.
 
3. Stoß nach Anspruch 1, dadurch gekennzeichnet, dass die Hauptschicht von einer Nickel-Phosphor-Legierung gebildet wird.
 
4. Stoß nach Anspruch 3, dadurch gekennzeichnet, dass Phosphor 5 Gew.-% bis 13 Gew.-%, vorzugsweise 8 Gew.-% bis 13 Gew.-%, bevorzugter 10 Gew.-% bis 12 Gew.-% des Gesamtgewichts der Nickel-Phosphor-Legierung ausmacht.
 
5. Stoß nach Anspruch 3 oder Anspruch 4, dadurch gekennzeichnet, dass die Dicke der Hauptschicht im Bereich von 10 bis 60 µm, vorzugsweise 20 bis 35 µm, bevorzugter 25 bis 30 µm liegt.
 
6. Stoß nach Anspruch 1, dadurch gekennzeichnet, dass die Hauptschicht von einer Nickel-Wolfram-Legierung gebildet wird.
 
7. Stoß nach Anspruch 6, dadurch gekennzeichnet, dass Wolfram 5 Gew.-% bis 15 Gew.-% des Gesamtgewichts der Nickel-Wolfram-Legierung ausmacht.
 
8. Stoß nach Anspruch 6 oder Anspruch 7, dadurch gekennzeichnet, dass die Dicke der Hauptschicht im Bereich von 5 bis 35 µm, vorzugsweise 5 bis 20 µm, bevorzugter 5 bis 15 µm liegt.
 
9. Stoß nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Dicke der Unterlage im Bereich von 1 bis 3 µm liegt.
 
10. Stoß nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Beschichtung ferner eine zusätzliche Schicht umfasst, die von einer Legierung gebildet wird, die aus Nickel-Phosphor-Legierungen, die Partikel aus einer oder mehreren Festschmierstoffverbindungen umfassen, sowie Nickel-Wolfram-Legierungen ausgewählt ist, wobei die zusätzliche Schicht auf der Hauptschicht angeordnet ist.
 
11. Stoß nach Anspruch 10, dadurch gekennzeichnet, dass die Partikel aus einer oder mehreren Festschmierstoffverbindungen aus Partikeln aus Polytetrafluorethylen, Talkum, Glimmer, Bornitrid, Siliciumcarbid, Wolframcarbid, Wolframsulfid, Molybdänsulfid und Mischungen daraus ausgewählt sind.
 
12. Stoß nach Anspruch 10 oder Anspruch 11, dadurch gekennzeichnet, dass der Phosphor der Nickel-Phosphor-Legierung, die Partikel aus einer oder mehreren Festschmierstoffverbindungen umfasst, 5 Gew.-% bis 13 Gew.-%, vorzugsweise 8 Gew.-% bis 13 Gew.-%, bevorzugter 10 Gew.-% bis 12 Gew.-% des Gesamtgewichts der Nickel-Phosphor-Legierung ausmacht, die die Partikel aus einer oder mehreren Festschmierstoffverbindungen umfasst.
 
13. Stoß nach einem der Ansprüche 10 bis 12, dadurch gekennzeichnet, dass die Partikel aus einer oder mehreren Festschmierstoffverbindungen bezogen auf das Gesamtvolumen der Nickel-Phosphor-Legierung, die die Partikel aus einer oder mehreren Festschmierstoffverbindungen umfasst, 20 Vol.-% bis 35 Vol.-%, vorzugsweise 25 Vol.-% bis 30 Vol.-% ausmachen.
 
14. Stoß nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass die Dicke der zusätzlichen Schicht im Bereich von 3 bis 13 µm, vorzugsweise 5 bis 10 µm liegt.
 
15. Stoß nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Beschichtung eine Schmiermittelschicht umfasst, die auf der Hauptschicht oder auf der zusätzlichen Schicht angeordnet ist, wenn die Beschichtung die zusätzliche Schicht umfasst.
 
16. Stoß nach Anspruch 15, dadurch gekennzeichnet, dass die Schmiermittelschicht aus einem Fett, einer Schicht aus einem halbfesten Schmiermittel oder einer Schicht aus einem Fest- und Trockenschmierstoff mit einem oder mehreren Festschmierstoffpartikeln in einem Harz ausgewählt ist.
 
17. Röhrenförmige Komponente, die einen Stoß nach einem der vorhergehenden Ansprüche umfasst.
 
18. Verfahren zum Erhalten eines Stoßes nach einem der Ansprüche 10 bis 16, dadurch gekennzeichnet, dass die Hauptschicht und die optionale zusätzliche Schicht mittels autokatalytischer Abscheidung abgeschieden werden.
 
19. Verfahren nach Anspruch 18, dadurch gekennzeichnet, dass es einen Nachbehandlungsschritt bei einer Temperatur im Bereich von 250 °C bis 550 °C umfasst.
 


Revendications

1. Butée pour un composant tubulaire, ladite butée étant recouverte avec un revêtement comprenant une couche principale constituée d'un alliage choisi parmi des alliages nickel-phosphore, des alliages cuivre-nickel et des alliages nickel-tungstène, caractérisée en ce que le revêtement comprend en outre une sous-couche constituée d'un alliage choisi parmi des alliages nickel-aluminium.
 
2. Butée selon la revendication 1, caractérisée en ce que l'épaisseur de ladite couche principale est dans la plage de 5 à 35 µm.
 
3. Butée selon la revendication 1, caractérisée en ce que la couche principale est constituée d'un alliage nickel-phosphore.
 
4. Butée selon la revendication 3, caractérisée en ce que le phosphore représente 5 % à 13 %, préférablement 8 % à 13 %, plus préférablement 10 % à 12 % en poids du poids total de l'alliage nickel-phosphore.
 
5. Butée selon la revendication 3 ou la revendication 4, caractérisée en ce que l'épaisseur de la couche principale est dans la plage de 10 à 60 µm, préférablement 20 à 35 µm, plus préférablement 25 à 30 µm.
 
6. Butée selon la revendication 1, caractérisée en ce que la couche principale est constituée d'un alliage nickel-tungstène.
 
7. Butée selon la revendication 6, caractérisée en ce que le tungstène représente 5 % à 15 % en poids du poids total de l'alliage nickel-tungstène.
 
8. Butée selon la revendication 6 ou la revendication 7, caractérisée en ce que l'épaisseur de la couche principale est dans la plage de 5 à 35 µm, préférablement 5 à 20 µm, plus préférablement 5 à 15 µm.
 
9. Butée selon l'une quelconque des revendications précédentes, caractérisée en ce que l'épaisseur de la sous-couche est dans la plage de 1 à 3 µm.
 
10. Butée selon l'une quelconque des revendications précédentes, caractérisée en ce que le revêtement comprend en outre une couche supplémentaire constituée d'un alliage choisi parmi des alliages nickel-phosphore comprenant des particules d'un ou plusieurs composés lubrifiants solides, et des alliages nickel-tungstène, ladite couche supplémentaire étant disposée sur ladite couche principale.
 
11. Butée selon la revendication 10, caractérisée en ce que les particules du ou des composés lubrifiants solides sont choisies parmi des particules de polytétrafluoroéthylène, de talc, de mica, de nitrure de bore, de carbure de silicium, de carbure de tungstène, de sulfure de tungstène, de sulfure de molybdène et de mélanges correspondants.
 
12. Butée selon la revendication 10 ou la revendication 11, caractérisée en ce que le phosphore de l'alliage nickel-phosphore comprenant les particules du ou des composés lubrifiants solides représente 5 % à 13 %, préférablement 8 % à 13 %, plus préférablement 10 % à 12 % en poids du poids total de l'alliage nickel-phosphore comprenant les particules du ou des composés lubrifiants solides.
 
13. Butée selon l'une quelconque des revendications 10 à 12, caractérisée en ce que les particules du ou des composés lubrifiants solides représentent 20 % à 35 % en volume, préférablement 25 % à 30 % en volume par rapport au volume total de l'alliage nickel-phosphore comprenant les particules du ou des composés lubrifiants solides.
 
14. Butée selon l'une quelconque des revendications 10 à 13, caractérisée en ce que l'épaisseur de ladite couche supplémentaire est dans la plage de 3 à 13 µm, préférablement 5 à 10 µm.
 
15. Butée selon l'une quelconque des revendications précédentes, caractérisée en ce que le revêtement comprend une couche lubrifiante disposée sur ladite couche principale ou sur ladite couche supplémentaire lorsque le revêtement comprend ladite couche supplémentaire.
 
16. Butée selon la revendication 15, caractérisée en ce que la couche lubrifiante est choisie parmi une graisse, une couche lubrifiante semi-solide et une couche lubrifiante sèche, solide comprenant une ou plusieurs particules lubrifiantes solides dans une résine.
 
17. Composant tubulaire comprenant une butée telle que définie dans l'une quelconque des revendications précédentes.
 
18. Procédé pour l'obtention d'une butée telle que définie dans l'une quelconque des revendications 10 à 16, caractérisé en ce que la couche principale et la couche supplémentaire éventuelle sont déposées par dépôt autocatalytique.
 
19. Procédé selon la revendication 18, caractérisé en ce qu'il comprend une étape de traitement postérieure à une température dans la plage de 250 °C à 550 °C.
 




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Cited references

REFERENCES CITED IN THE DESCRIPTION



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Patent documents cited in the description




Non-patent literature cited in the description