US20060112976A1 - Method for removing at least one partial area of a component made of metal or a metallic compound - Google Patents

Method for removing at least one partial area of a component made of metal or a metallic compound Download PDF

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Publication number
US20060112976A1
US20060112976A1 US10/516,085 US51608504A US2006112976A1 US 20060112976 A1 US20060112976 A1 US 20060112976A1 US 51608504 A US51608504 A US 51608504A US 2006112976 A1 US2006112976 A1 US 2006112976A1
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US
United States
Prior art keywords
component
diffusion agent
partial area
layer
metal
Prior art date
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Abandoned
Application number
US10/516,085
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English (en)
Inventor
Ralph Reiche
Werner Stamm
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Siemens AG
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STAMM, WERNER, REICHE, RALPH
Publication of US20060112976A1 publication Critical patent/US20060112976A1/en
Abandoned 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/60—After-treatment
    • 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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/02—Pretreatment of the material to be coated
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F4/00—Processes for removing metallic material from surfaces, not provided for in group C23F1/00 or C23F3/00
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents

Definitions

  • the invention relates to a method for removing a partial area, in particular a layer area, of a component consisting of metal or a metal compound, so that the partial area can be removed more easily after the method has been applied.
  • efficiency plays an important role, since it is a parameter which can be used to reduce the costs of operation of the gas turbine installation.
  • One possible way of increasing the efficiency and thereby reducing the operating costs is to increase inlet temperatures of a combustion gas within a gas turbine.
  • ceramic thermal barrier coatings have been developed and are applied to components that are subject to thermal loading, for example made from superalloys, which are no longer able to withstand even the high inlet temperatures over the course of time.
  • the ceramic thermal barrier coating offers the advantage of a high thermal stability on account of its ceramic properties, and the metallic substrate offers the advantage of good mechanical properties in this assembly or layer system.
  • composition of these MCrAlY layers may vary, but despite the ceramic layer on top of them, all MCrAlY layers are subject to corrosion or degradation as a result of oxidation, sulfiding, nitriding, diffusion or other chemical and/or mechanical attacks.
  • the MCrAlY layer is degraded to a greater extent than the metallic substrate, i.e. the service life of the composite system comprising substrate and layer is determined by the service life of the MCrAlY layer.
  • the MCrAlY interlayer After prolonged use, the MCrAlY interlayer only has a limited ability to function, whereas the substrate may still be fully functional.
  • a method for removing corrosion products is known from U.S. Pat. No. 6,217,668.
  • the corroded component is accommodated in a large crucible, where the component is arranged in a powder bed with an aluminum source.
  • the crucible must be partially closed and then heated in a furnace.
  • the heating process supplies aluminum to the corroded component, with the result that the regions which had hitherto been more difficult to remove, i.e. which had a higher resistance to removal, can be removed by means of subsequent acid treatment.
  • Large amounts of material are required for the powder bed, and the crucible takes up a large amount of space in the furnace during the heat treatment. The heating process also lasts longer, on account of the high heat capacity.
  • the invention overcomes the described drawbacks by means of a method as described in the claims.
  • the diffusion agent can be applied by simple, known coating methods; such as plasma spraying, evaporation coating, CVD, pack methods (component in a powder bed) or other methods (paste application).
  • FIG. 1 shows a corroded metallic component
  • FIG. 2 shows a component to which the diffusion agent has been applied
  • FIG. 3 shows the component illustrated in FIG. 2 following a heat treatment
  • FIG. 4 shows components which are being subjected to an acid treatment
  • FIGS. 5, 6 show components after an acid treatment for a method according to the invention and a method according to the prior art.
  • FIG. 1 shows a component 1 made of metal, a metal alloy and/or a metal compound, which in at least one partial area at a surface 13 and/or in the interior of the component 1 has corrosion products 4 which are present, for example, in regions formed separated from one another.
  • the corrosion products 4 may also be linked together or may be present on/underneath the entire surface 13 , i.e. may also form a corrosion layer 4 .
  • the region enclosed by a dot-dashed line represents a partial area 28 .
  • the component 1 may be a bulk component or a layer or a region of a composite or layer system 14 .
  • a layer system 14 there is a substrate 7 made from metal or ceramic, to which the metallic layer 10 , for example an MCrAlY layer, has been applied; M indicates that a metal composed of nickel, chromium or iron is used.
  • the partial area 28 may also be a partial area of the layer 10 or may represent the entire layer 10 of the layer system 14 and/or part of the metallic substrate 7 .
  • the corrosion products 4 have formed while the component 1 was in use and are undesirable for further use of the component and need to be removed. This is often done by a treatment in an acid bath.
  • the material of the component 1 beneath or above the layer 10 of degraded regions and/or the corrosion products 4 have a different reactivity in an acid bath, i.e. are more resistant to removal.
  • the different solubility in the acid bath is caused by the different solubility of the corrosion products 4 or because an original composition of the material of the component 1 or the layer 10 has changed, e.g. because the corrosion product 4 removes a component from a region of the component 1 in the region around the corrosion product 4 , where it produces a depletion region. This leads to nonuniform removal or even no removal of the corrosion products 4 or the material in the depletion region.
  • the method according to the invention makes it possible to remove the corrosion products or the altered layer or base material regions completely and uniformly with the material of the component 1 or the layer 10 .
  • coarse removal of the corrosion products 4 or other regions can be effected by mechanical methods, such as for example sand blasting and/or chemical means, such as for example an acid bath.
  • a multi-component diffusion agent 16 is, for example, applied to the corroded component 1 on the surface 13 , in particular in the region having the corrosion products 4 , or to the corrosion layer 4 , or at least one component of the diffusion agent 16 diffuses into the component 1 directly from the gas phase, the corrosion products 4 in this example representing the regions which are more resistant to removal.
  • the diffusion agent 16 contains, for example, two components, both of which diffuse into the layer 10 or the component 1 as a result of a heat treatment, where they alter the chemical composition and materials.
  • the diffusion and heat treatment can also give rise to the formation of new phases which can be removed more easily by an acid bath 19 ( FIG. 4 ).
  • FIG. 3 shows a component as shown in FIG. 2 , in which the diffusion agent 16 has completely diffused into the layer 10 as a result of a heat treatment at a temperature T.
  • the layer 10 represents the partial area 28 that is to be removed, comprising not just regions that are more resistant to removal.
  • the diffusion agent 16 is made up of at least two components. At least one component of the diffusion agent 16 is, for example, metallic, such as for example aluminum. By way of example, cobalt represents a further metallic component. Other components may include silicon or carbon.
  • the method functions particularly well if cobalt and aluminum diffuse into the partial area 28 as components of the diffusion agent 16 .
  • the ⁇ ′ phase is prevented from re-forming.
  • enriching the MCrAlY layer with aluminum and/or cobalt causes ⁇ and ⁇ ′ phase to be converted into an aluminum-rich ⁇ phase.
  • FIG. 4 shows two components which are arranged in an acid bath 19 or are exposed to an acid attack.
  • FIG. 5 shows the component 22 following the acid treatment.
  • the component 22 still has acid-resistant regions 25 which have not been removed or have been removed to a lesser extent during the acid attack, resulting in nonuniform removal of a layer area of the component 22 .
  • FIG. 6 shows a component 1 or layer system 14 in which a layer area of the component I or the layer 10 has been removed uniformly.
  • the diffusion of the diffusion agent 16 has also enabled the partial area 28 to become so brittle that the partial area 28 can be removed by a mechanical treatment (sand blasting, ultrasound, dry ice blasting).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • ing And Chemical Polishing (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
US10/516,085 2002-05-29 2003-05-27 Method for removing at least one partial area of a component made of metal or a metallic compound Abandoned US20060112976A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP02011965.7 2002-05-29
EP02011965A EP1367144A1 (de) 2002-05-29 2002-05-29 Verfahren zur Entfernung von zumindest einem Teilbereich eines Bauteils aus Metall oder einer Metallverbindung
PCT/EP2003/005573 WO2003100110A2 (de) 2002-05-29 2003-05-27 Verfahren zur entfernung von zumindest einem teilbereich eines bauteils aus metall oder einer metallverbindung

Publications (1)

Publication Number Publication Date
US20060112976A1 true US20060112976A1 (en) 2006-06-01

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US10/516,085 Abandoned US20060112976A1 (en) 2002-05-29 2003-05-27 Method for removing at least one partial area of a component made of metal or a metallic compound

Country Status (3)

Country Link
US (1) US20060112976A1 (de)
EP (2) EP1367144A1 (de)
WO (1) WO2003100110A2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150370882A1 (en) * 2014-06-20 2015-12-24 Amazon Technologies, Inc. Use of dependency graphs to dynamically update n-dimensional cubes
US10812551B1 (en) 2014-06-20 2020-10-20 Amazon Technologies, Inc. Dynamic detection of data correlations based on realtime data
US11868372B1 (en) 2014-06-20 2024-01-09 Amazon Technologies, Inc. Automated hierarchy detection for cloud-based analytics

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1932954A1 (de) * 2006-12-05 2008-06-18 Siemens Aktiengesellschaft, A German Corporation Verfahren zum Beschichten eines mit Öffnungen versehenen Bauteils

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184292A (en) * 1964-07-08 1965-05-18 Du Pont Process and composition for diffusion coating refractory metals and product produced thereby
US4117179A (en) * 1976-11-04 1978-09-26 General Electric Company Oxidation corrosion resistant superalloys and coatings
US4965095A (en) * 1979-03-30 1990-10-23 Alloy Surfaces Company, Inc. Method for refurbishing used jet engine hot section airfoils
US6010746A (en) * 1998-02-03 2000-01-04 United Technologies Corporation In-situ repair method for a turbomachinery component
US6024792A (en) * 1997-02-24 2000-02-15 Sulzer Innotec Ag Method for producing monocrystalline structures
US6036995A (en) * 1997-01-31 2000-03-14 Sermatech International, Inc. Method for removal of surface layers of metallic coatings
US6042879A (en) * 1997-07-02 2000-03-28 United Technologies Corporation Method for preparing an apertured article to be recoated
US6217668B1 (en) * 1991-07-29 2001-04-17 Siemens Aktiengesellschaft Refurbishing of corroded superalloy or heat resistant steel parts
US6569492B2 (en) * 2000-06-05 2003-05-27 Alstom Ltd Process for repairing a coated component
US20040244817A1 (en) * 2001-10-01 2004-12-09 Norbert Czech Method for removing at least one area of a layer of a component consisting of metal or a metal compound

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB980727A (en) * 1963-09-23 1965-01-20 Coast Metals Inc Method of applying metallic coatings
GB2167773A (en) * 1984-11-29 1986-06-04 Secr Defence Improvements in or relating to coating processes
US6328810B1 (en) * 1999-04-07 2001-12-11 General Electric Company Method for locally removing oxidation and corrosion product from the surface of turbine engine components
US6533875B1 (en) * 2000-10-20 2003-03-18 General Electric Co. Protecting a surface of a nickel-based article with a corrosion-resistant aluminum-alloy layer

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184292A (en) * 1964-07-08 1965-05-18 Du Pont Process and composition for diffusion coating refractory metals and product produced thereby
US4117179A (en) * 1976-11-04 1978-09-26 General Electric Company Oxidation corrosion resistant superalloys and coatings
US4965095A (en) * 1979-03-30 1990-10-23 Alloy Surfaces Company, Inc. Method for refurbishing used jet engine hot section airfoils
US6217668B1 (en) * 1991-07-29 2001-04-17 Siemens Aktiengesellschaft Refurbishing of corroded superalloy or heat resistant steel parts
US6036995A (en) * 1997-01-31 2000-03-14 Sermatech International, Inc. Method for removal of surface layers of metallic coatings
US6024792A (en) * 1997-02-24 2000-02-15 Sulzer Innotec Ag Method for producing monocrystalline structures
US6042879A (en) * 1997-07-02 2000-03-28 United Technologies Corporation Method for preparing an apertured article to be recoated
US6010746A (en) * 1998-02-03 2000-01-04 United Technologies Corporation In-situ repair method for a turbomachinery component
US6569492B2 (en) * 2000-06-05 2003-05-27 Alstom Ltd Process for repairing a coated component
US20040244817A1 (en) * 2001-10-01 2004-12-09 Norbert Czech Method for removing at least one area of a layer of a component consisting of metal or a metal compound

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150370882A1 (en) * 2014-06-20 2015-12-24 Amazon Technologies, Inc. Use of dependency graphs to dynamically update n-dimensional cubes
US10776397B2 (en) 2014-06-20 2020-09-15 Amazon Technologies, Inc. Data interest estimation for n-dimensional cube computations
US10812551B1 (en) 2014-06-20 2020-10-20 Amazon Technologies, Inc. Dynamic detection of data correlations based on realtime data
US11868372B1 (en) 2014-06-20 2024-01-09 Amazon Technologies, Inc. Automated hierarchy detection for cloud-based analytics

Also Published As

Publication number Publication date
WO2003100110A2 (de) 2003-12-04
EP1367144A1 (de) 2003-12-03
WO2003100110A3 (de) 2004-03-04
EP1507882A2 (de) 2005-02-23

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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:REICHE, RALPH;STAMM, WERNER;REEL/FRAME:017323/0328;SIGNING DATES FROM 20041011 TO 20041022

STCB Information on status: application discontinuation

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