EP0289432A1 - Verfahren zum Formen einer auf der Oberfläche eines Substrates aus einer Aluminiumlegierung befindlichen Zone, die reich ist an einem Aluminid von mindestens einem der Elemente Nickel, Eisen, Kobalt - Google Patents

Verfahren zum Formen einer auf der Oberfläche eines Substrates aus einer Aluminiumlegierung befindlichen Zone, die reich ist an einem Aluminid von mindestens einem der Elemente Nickel, Eisen, Kobalt Download PDF

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Publication number
EP0289432A1
EP0289432A1 EP88420105A EP88420105A EP0289432A1 EP 0289432 A1 EP0289432 A1 EP 0289432A1 EP 88420105 A EP88420105 A EP 88420105A EP 88420105 A EP88420105 A EP 88420105A EP 0289432 A1 EP0289432 A1 EP 0289432A1
Authority
EP
European Patent Office
Prior art keywords
substrate
nickel
rich
treatment
al3ni
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.)
Withdrawn
Application number
EP88420105A
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English (en)
French (fr)
Inventor
Michel Badia
Clément Laviron
Guy-Michel Raynaud
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.)
Pechiney Recherche GIE
Original Assignee
Cegedur Societe de Transformation de lAluminium Pechiney SA
Pechiney Recherche GIE
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 Cegedur Societe de Transformation de lAluminium Pechiney SA, Pechiney Recherche GIE filed Critical Cegedur Societe de Transformation de lAluminium Pechiney SA
Publication of EP0289432A1 publication Critical patent/EP0289432A1/de
Withdrawn legal-status Critical Current

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    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/42—Pretreatment of metallic surfaces to be electroplated of light metals
    • C25D5/44—Aluminium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment

Definitions

  • the invention relates to a process for forming on the surface of an aluminum alloy substrate a zone rich in aluminide of at least one of the elements nickel, iron, cobalt.
  • These coatings are generally formed of several layers formed from the inside towards the outside of the part, by NiAl aluminide, Ni2Al3 aluminide and an alloy of aluminum and mischemetal.
  • Said layers are obtained either by immersing the part in a bath of heated metallic powder or in molten metal, or by spraying on the surface of the part metallic compounds capable, by a suitable heat treatment, of developing the desired compounds.
  • coated parts generally find their application in the aeronautical industry, in particular for the manufacture of reactor turbine components.
  • aluminides are used mainly as an intermediate layer ensuring the attachment of other materials.
  • aluminide itself as the ultimate coating.
  • these aluminides are endowed with remarkable properties such as high hardness, remarkable resistance to wear, to oxidation and to corrosion.
  • their elastic limit can be greatly improved by the addition of certain elements such as for example hafnium, molybdenum, zirconium. It therefore seems interesting to be able to develop these properties.
  • the Applicant proposes in the present invention a means making it possible to overcome these obstacles and, therefore, to go beyond the current methods of external supply of aluminides by developing the in situ formation of these compounds from simple elements aluminum, nickel, iron, cobalt.
  • This means is a process for forming on the surface of an aluminum alloy substrate a zone rich in aluminide of at least one of the elements nickel, iron, cobalt, characterized in that: - depositing at least one of said elements on the substrate without an intermediate sub-layer - The assembly is subjected to a diffusion heat treatment at a temperature above the starting melting temperature of at least one of the intermetallic compounds present in the substrate.
  • the process consists, not in depositing an aluminide on the substrate and then hanging it on said substrate but, in depositing a metallic element such as nickel, iron, cobalt and then transform it in situ into an aluminide using the aluminum from the substrate.
  • the deposition must be carried out directly on the substrate and not by means of sub-bonding layer which would prevent the formation of the aluminide.
  • the implementation of the method according to the invention therefore requires the use of a direct deposition method which nevertheless leads to suitable attachment which allows during the heat treatment to ensure the diffusion essential for the formation of the aluminide. .
  • the deposit is chosen at a thickness of less than 800 ⁇ m.
  • the second phase of the process according to the invention consists in subjecting the coated substrate to a heat treatment at a temperature which, for practical reasons of duration and of metal quality, does not exceed more than a few degrees the starting melting point of at least one of the intermetallic compounds present in the substrate.
  • the difference between the two temperatures is between 5 and 25 ° C because below 5 ° C there is no adhesion between the aluminide layers and the substrate and above 25 ° C, there is too much deformation of the substrate.
  • This treatment can be carried out in a conventional heat treatment oven where the coated substrate is kept for a variable period depending on the type of aluminide that one wants to form and consequently the properties that one wants to develop.
  • this duration is between 1 and 150 hours, range outside which either the thickness of the zone rich in aluminide is insignificant or changes too slowly.
  • the thickness and the composition of the aluminides formed are varied.
  • a zone rich in Al3Ni is overcome as a function of the duration of holding, first in contact with the substrate, surmounted by a zone rich in Al3Ni2 and an external zone rich in nickel. If the temperature maintenance is continued, the nickel-rich zone gradually disappears while the thicknesses of Al3Ni and Al3Ni2 vary in favor of Al3Ni. After a certain time, only the Al3Ni phase remains with a final thickness five times greater than the thickness of the initial nickel deposit.
  • the first, in contact with the aluminum substrate, consists of Al3Ni and has a thickness of 40 ⁇ m and a hardness of 700 Hv.
  • the second is above and made of Al3Ni2 with a thickness of 30 ⁇ m and a hardness of 1000 Hv.
  • Figure 1 attached shows at 200 magnification in section a micrographic view of the coating obtained at 530 ° C.
  • Example 2 The same sample was used as in Example 1 and after degreasing and depositing the same thickness of nickel, it was placed in an enclosure at 530 ° C for 15 hours.
  • the sample can be subjected to rapid cooling by water quenching without noticing any decohesion of the layer and then to an annealing heat treatment for 24 hours at 120 ° C. so as to restore the mechanical characteristics of the AA.7075 alloy in the T6 state while maintaining the intrinsic properties of the layer.
  • Figure 2 attached shows at 200 magnification in section a micrographic view of the coating obtained.
  • Example 2 The same sample was used as in Example 1, on which 100 ⁇ m of nickel was deposited.
  • a sample of AA.5086 alloy was used on which 20 ⁇ m of nickel was deposited according to the same method.
  • Example 4 The same results were obtained as in Example 4 with an AA.6061 alloy treated for 15 hours at 610 ° C, ie 15 ° C above the starting melting temperature.
  • Such coatings make it possible to improve the hardness, the resistance to wear, to oxidation and to corrosion of aluminum alloy substrates. This also makes it possible to obtain aluminum alloy parts having, with the proposed coating, an improved elastic modulus.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
EP88420105A 1987-03-30 1988-03-29 Verfahren zum Formen einer auf der Oberfläche eines Substrates aus einer Aluminiumlegierung befindlichen Zone, die reich ist an einem Aluminid von mindestens einem der Elemente Nickel, Eisen, Kobalt Withdrawn EP0289432A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8704589 1987-03-30
FR8704589 1987-03-30

Publications (1)

Publication Number Publication Date
EP0289432A1 true EP0289432A1 (de) 1988-11-02

Family

ID=9349684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420105A Withdrawn EP0289432A1 (de) 1987-03-30 1988-03-29 Verfahren zum Formen einer auf der Oberfläche eines Substrates aus einer Aluminiumlegierung befindlichen Zone, die reich ist an einem Aluminid von mindestens einem der Elemente Nickel, Eisen, Kobalt

Country Status (1)

Country Link
EP (1) EP0289432A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0892088A2 (de) * 1997-07-04 1999-01-20 Nippon Platec Kabushiki Kaisha Verfahren zur Herstellung von mit Eisen plattierten Aluminiumwerkstoffen
WO2005045102A2 (de) * 2003-11-07 2005-05-19 Aluminal Oberflächentechnik Gmbh & Co. Kg Beschichten von substraten
EP1533401A1 (de) * 2003-11-14 2005-05-25 Aluminal Oberflächtentechnik GmbH & Co. KG Galvanisches Beschichten von Substraten gefolgt von einem Diffusionsschritt
DE19962641B4 (de) * 1999-12-23 2012-04-19 Erlus Aktiengesellschaft Verfahren zur Erzeugung einer Mikrostruktur auf einer metallischen Oberfläche und mikrostrukturierte metallische Oberfläche

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2362026A1 (de) * 1973-12-13 1975-06-26 Aluminium Werke Ag Verfahren zur oberflaechenbehandlung von werkstuecken und halbzeugen aus aluminium oder aluminiumlegierungen
EP0093681A1 (de) * 1982-04-29 1983-11-09 Aluminium Pechiney Verfahren und Vorrichtung zur galvanischen Beschichtung von metallischen Bändern grosser Länge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2362026A1 (de) * 1973-12-13 1975-06-26 Aluminium Werke Ag Verfahren zur oberflaechenbehandlung von werkstuecken und halbzeugen aus aluminium oder aluminiumlegierungen
EP0093681A1 (de) * 1982-04-29 1983-11-09 Aluminium Pechiney Verfahren und Vorrichtung zur galvanischen Beschichtung von metallischen Bändern grosser Länge

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
S. WERNICK et al.: "The suface treatment and finishing of aluminium and its alloys", vol. 2, 4ième édition, 1972, pages 874,875, Robert Draper Ltd, Teddington, GB, 1972 *
S. WERNICK et al.: "The suface treatment and finishing of aluminium and its alloys", vol. 2, édition 4ième, pages 874,875, Robert Draper Ltd, Teddington, GB, 1972 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0892088A2 (de) * 1997-07-04 1999-01-20 Nippon Platec Kabushiki Kaisha Verfahren zur Herstellung von mit Eisen plattierten Aluminiumwerkstoffen
EP0892088A3 (de) * 1997-07-04 1999-02-03 Nippon Platec Kabushiki Kaisha Verfahren zur Herstellung von mit Eisen plattierten Aluminiumwerkstoffen
DE19962641B4 (de) * 1999-12-23 2012-04-19 Erlus Aktiengesellschaft Verfahren zur Erzeugung einer Mikrostruktur auf einer metallischen Oberfläche und mikrostrukturierte metallische Oberfläche
WO2005045102A2 (de) * 2003-11-07 2005-05-19 Aluminal Oberflächentechnik Gmbh & Co. Kg Beschichten von substraten
WO2005045102A3 (de) * 2003-11-07 2006-02-16 Aluminal Oberflaechentechnik Beschichten von substraten
EP1533401A1 (de) * 2003-11-14 2005-05-25 Aluminal Oberflächtentechnik GmbH & Co. KG Galvanisches Beschichten von Substraten gefolgt von einem Diffusionsschritt

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