US20160369385A1 - Impregnation of an hvof coating by a lubricant - Google Patents

Impregnation of an hvof coating by a lubricant Download PDF

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Publication number
US20160369385A1
US20160369385A1 US14/902,416 US201414902416A US2016369385A1 US 20160369385 A1 US20160369385 A1 US 20160369385A1 US 201414902416 A US201414902416 A US 201414902416A US 2016369385 A1 US2016369385 A1 US 2016369385A1
Authority
US
United States
Prior art keywords
coating
pores
lubricant
lubricating agent
solid lubricant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/902,416
Other languages
English (en)
Inventor
Francis Monerie-Moulin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Safran Landing Systems SAS
Original Assignee
Messier Bugatti Dowty SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Messier Bugatti Dowty SA filed Critical Messier Bugatti Dowty SA
Assigned to MESSIER-BUGATTI-DOWTY reassignment MESSIER-BUGATTI-DOWTY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MONERIE-MOULIN, FRANCIS
Publication of US20160369385A1 publication Critical patent/US20160369385A1/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/129—Flame spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment

Definitions

  • the invention relates to a method of protecting a metal substrate coated by the HVOF method.
  • HVOF high velocity oxy-fuel
  • coating layers deposited in this way have the reputation of being very dense, and it is usual to improve the friction qualities of a mechanical part that is coated in this way by greasing it.
  • the grease is applied when inserting the part into the mechanism in which it is be installed and where it is liable to come into contact with another part during relative motion.
  • the WC—Co—Cr layer is machined beforehand (e.g. by grinding) in order to impart the design dimensions to the part as coated in this way.
  • An object of the invention is to protect a metal substrate coated by the HVOF method in a coating, preferably a coating of WC—Co—Cr type, in order to avoid the risk of rubbing bare.
  • the invention provides a method of protecting a metal substrate coated in a coating, preferably of WC—Co—Cr type, by the HVOF method, the method comprising applying a lubricating agent on the coating, which lubricating agent comprises particles of solid lubricant incorporated in a fluid having surface tension that is low enough to penetrate into the pores of the coating and to entrain the solid lubricant particles therein.
  • the inventors have observed that although coatings deposited by the HVOF method, and in particular coatings of the WC—Co—Cr type, are very dense, they nevertheless present a high level of interconnected porosity, which may exceed 15%, but with pores that are very small in size (typically of the order of 350 nanometers (nm)). The presence of such pores has passed unnoticed until now because pores that are so small are generally not detected by porosity measurement methods involving analyzing images at magnifications of ⁇ 200 to ⁇ 400, as are commonly used in industry. Nevertheless, such pores can be revealed by mercury porosimetry, which can also reveal a large amount of connectivity between pores.
  • a self-lubricating surface is thus created from which the solid lubricant is released and exerts its lubricating power progressively as the coating is worn away, without there being any need to re-lubricate.
  • the lubricating agent containing particles of lubricant is applied in an environment at reduced pressure, in a vacuum, or at a pressure higher than atmospheric pressure.
  • the lubricating agent it is also possible to vary pressure between low pressure, such as an airvoid, and a high pressure of the surroundings. This seeks to facilitate penetration of the lubricant into the pores in order to impregnate the deposited coatings correctly.
  • an operation is performed of mechanically closing the pores of the coating, at least in part, by machining and/or grinding and/or polishing a surface portion of the coating.
  • the mechanical operation of machining and/or grinding and/or polishing has the effect of plastically deforming at least some of the pores that are situated close to the surface of the coating (i.e. in a surface zone of the coating layer). This operation serves to close, at least in part, some of the pores situated at the surface of the coating, thereby limiting the passage for releasing the lubricant that has penetrated into the array of interconnected pores.
  • the lubricant is thus made accessible from the outside of the coating only via open pores that lead to the outside of the coating.
  • the closed or partially closed pores open up and release a portion of the lubricant they contain.
  • the coating thus presents an incorporated lubricating function that releases its lubricant at the same time as it becomes worn.
  • HVOF method for coating landing gear sliding rods that are made of high strength steel (300M steel in AMS standard 6257, or Aermet 100 steel in AMS standard 6532, after heat treatment in the range 1900 megapascals (MPa) to 2000 MPa) with a coating of WC-10Co-4Cr type having a mean size of agglomerates lying in the range 15 micrometers ( ⁇ m) to 45 ⁇ m, which is obtained from standard elementary tungsten carbide (in the range 1 ⁇ m to 4 ⁇ m).
  • the selected lubricating agent is prepared from a hydrophobic fluid of WADIS24 type from the supplier Socomore Finishing Solutions.
  • the fluid is enriched by incorporating therein particles of solid lubricant, e.g. of graphite, of molybdenum disulfide, or of tungsten disulfide.
  • solid lubricant e.g. of graphite, of molybdenum disulfide, or of tungsten disulfide.
  • the lubricating agent is deposited on the coating by spraying or with a paint brush.
  • the fluid forms a sealing monomolecular film at the surface of the coating and permeates into the pores of the coating, entraining the solid lubricant particles therewith.
  • a part is thus obtained that has a self-lubricating HVOF coating from which the solid lubricants are released progressively as the coating wears in service.
  • the recommended fluid is compatible with mineral oils, such that the part can be put rapidly into contact with another lubricant. Nevertheless, if that lubricant should run out during the lifetime of the part, the self-lubricating mechanism takes over in order to protect the part from any risk of rubbing bare.
  • the fluid has the effect of expelling water from the surface of the rod and it thus contributes to protecting the rod against corrosion.
  • Such treatment may be performed after the coating has been ground. Nevertheless, such treatment can also be performed before grinding, since that increases penetration of the lubricant into the preferably mutually interconnected open pores (where grinding has the effect of closing pores that are situated at the surface of the coating). Under such circumstances, the lubricant is released progressively as the coating wears, and in particular progressively during the wear of pores that are closed or partially closed and that contain the lubricant.
  • the presently-described lubricating agent contains a WADIS24 hydrophobic fluid
  • any other fluid having surface tension that is low enough to encourage penetration into the pores of the coating e.g. perchloroethylene (tetrachloro ethylene).
  • perchloroethylene tetrachloro ethylene
  • micrometric molybdenum disulfide, and graphite mixed with an inorganic binder agent, e.g. sodium silicate, with that mixture being wetted with perchloroethylene e.g. sodium silicate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
US14/902,416 2013-07-17 2014-07-16 Impregnation of an hvof coating by a lubricant Abandoned US20160369385A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR1357040 2013-07-17
FR1357040A FR3008715B1 (fr) 2013-07-17 2013-07-17 Impregnation d'un revetement hvof par un lubrifiant
PCT/EP2014/065247 WO2015007777A1 (fr) 2013-07-17 2014-07-16 Impregnation d'un revêtement hvof par un lubrifiant

Publications (1)

Publication Number Publication Date
US20160369385A1 true US20160369385A1 (en) 2016-12-22

Family

ID=49546541

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/902,416 Abandoned US20160369385A1 (en) 2013-07-17 2014-07-16 Impregnation of an hvof coating by a lubricant

Country Status (4)

Country Link
US (1) US20160369385A1 (de)
EP (1) EP3022326B1 (de)
FR (1) FR3008715B1 (de)
WO (1) WO2015007777A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180030365A1 (en) * 2015-04-10 2018-02-01 United Technologies Corporation Solid lubricant filled structural matrix

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749559A (en) * 1969-10-20 1973-07-31 Ramsey Corp Piston rings with coating impregnated with antifriction agent
DE4418517C1 (de) * 1994-05-27 1995-07-20 Difk Deutsches Inst Fuer Feuer Verfahren zum Herstellen einer Verschließschicht und ihre Verwendung
US20020136894A1 (en) * 2001-01-25 2002-09-26 Fujimi Incorporated Spray powder and method for its production
US20080145649A1 (en) * 2006-12-14 2008-06-19 General Electric Protective coatings which provide wear resistance and low friction characteristics, and related articles and methods
US20100038076A1 (en) * 2006-03-10 2010-02-18 Dynamic Tubular Systems, Inc. Expandable tubulars for use in geologic structures
US20100221425A1 (en) * 2006-11-30 2010-09-02 Caterpillar, Inc. Textured Coating on a Component Surface
US20130171367A1 (en) * 2011-12-30 2013-07-04 Grzegorz Jan Kusinski Coating compositions, applications thereof, and methods of forming

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01191771A (ja) * 1988-01-25 1989-08-01 Diesel Kiki Co Ltd 潤滑用被膜の形成方法
DE59506236D1 (de) * 1995-02-02 1999-07-22 Sulzer Innotec Ag Gleitverschleissfeste Verbundbeschichtung
JPH11335806A (ja) * 1998-05-28 1999-12-07 Mitsubishi Heavy Ind Ltd 高温用摺動材の製造方法
JP2002194523A (ja) * 2000-12-25 2002-07-10 Toshiba Corp 駆動部品とその製造方法並びに駆動部品を具備した電力用開閉装置
JP2003113462A (ja) * 2001-10-09 2003-04-18 Kawasaki Steel Corp 溶射皮膜の形成方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749559A (en) * 1969-10-20 1973-07-31 Ramsey Corp Piston rings with coating impregnated with antifriction agent
DE4418517C1 (de) * 1994-05-27 1995-07-20 Difk Deutsches Inst Fuer Feuer Verfahren zum Herstellen einer Verschließschicht und ihre Verwendung
US20020136894A1 (en) * 2001-01-25 2002-09-26 Fujimi Incorporated Spray powder and method for its production
US20100038076A1 (en) * 2006-03-10 2010-02-18 Dynamic Tubular Systems, Inc. Expandable tubulars for use in geologic structures
US20100221425A1 (en) * 2006-11-30 2010-09-02 Caterpillar, Inc. Textured Coating on a Component Surface
US20080145649A1 (en) * 2006-12-14 2008-06-19 General Electric Protective coatings which provide wear resistance and low friction characteristics, and related articles and methods
US20130171367A1 (en) * 2011-12-30 2013-07-04 Grzegorz Jan Kusinski Coating compositions, applications thereof, and methods of forming

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180030365A1 (en) * 2015-04-10 2018-02-01 United Technologies Corporation Solid lubricant filled structural matrix

Also Published As

Publication number Publication date
WO2015007777A1 (fr) 2015-01-22
EP3022326A1 (de) 2016-05-25
FR3008715A1 (fr) 2015-01-23
FR3008715B1 (fr) 2015-08-14
EP3022326B1 (de) 2017-08-30

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AS Assignment

Owner name: MESSIER-BUGATTI-DOWTY, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MONERIE-MOULIN, FRANCIS;REEL/FRAME:039742/0388

Effective date: 20160201

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION