EP1819906A2 - Verfahren zum schutz einer komponente gegen hochtemperaturkorrosion - Google Patents

Verfahren zum schutz einer komponente gegen hochtemperaturkorrosion

Info

Publication number
EP1819906A2
EP1819906A2 EP05818992A EP05818992A EP1819906A2 EP 1819906 A2 EP1819906 A2 EP 1819906A2 EP 05818992 A EP05818992 A EP 05818992A EP 05818992 A EP05818992 A EP 05818992A EP 1819906 A2 EP1819906 A2 EP 1819906A2
Authority
EP
European Patent Office
Prior art keywords
coating
component
weight
chromium
aluminium
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Withdrawn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
EP05818992A
Other languages
English (en)
French (fr)
Inventor
Paul Box
Mick Whitehurst
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1819906A2 publication Critical patent/EP1819906A2/de
Withdrawn legal-status Critical Current

Links

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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/04—Diffusion into selected surface areas, e.g. using masks
    • 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
    • C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
    • C23C10/16—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases more than one element being diffused in more than one step
    • 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
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34—Embedding in a powder mixture, i.e. pack cementation
    • C23C10/52—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in one step
    • C23C10/54—Diffusion of at least chromium
    • C23C10/56—Diffusion of at least chromium and at least aluminium
    • 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
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/34—Embedding in a powder mixture, i.e. pack cementation
    • C23C10/58—Embedding in a powder mixture, i.e. pack cementation more than one element being diffused in more than one step
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/007—Preventing corrosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/288—Protective coatings for blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/90—Coating; Surface treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/611—Coating

Definitions

  • This invention relates to a method of protecting a component against hot corrosion.
  • the invention finds particular application in the protection against hot corrosion of a gas turbine engine rotor blade.
  • chromium provides excellent protection against so called Type I and Type II hot corrosion.
  • diffusion coatings produced by the diffusion of chromium and aluminium into the alloy substrate have long been used to provide this protection.
  • a method of protecting a component against hot corrosion comprising the steps: (a) applying a chromium diffusion coating to the component; and (b) applying a further coating to selected regions of the chromium diffusion coating, the selected regions being chosen dependent on subsequent use of the component.
  • the selected regions are regions not subject to higher physical stress in the subsequent use of the component .
  • the further coating comprises an aluminium diffusion coating.
  • the further coating comprises an MCrAlY overlay coating, where M is Ni or Co or a combination of the two.
  • the further coating comprises an MCrAlY overlay coating, where M is Ni or Co or a combination of the two, and the method further comprises the step (c) applying an aluminium diffusion coating to the selected regions coated with the MCrAlY overlay coating.
  • the MCrAlY overlay coating applied in step (b) suitably comprises: 30 to 70 weight % Nickel; 30 to 50 weight % Cobalt; 15 to 25 weight % Chromium; 5 to 15 weight % Aluminium; and up to 1 weight %
  • the MCrAlY overlay coating applied in step (b) may additionally include one or more elements selected from the group consisting of rhenium, silicon and hafnium.
  • the chromium diffusion coating applied in step (a) suitably comprises 15 to 30 weight % chromium and is 5 to 25 microns thick.
  • Methods according to the present invention find particular application in the protection against hot corrosion of nickel based superalloy components.
  • Methods according to the present invention find particular application in the protection against hot corrosion of gas turbine engine rotor blades.
  • the present invention also extends to components protected against hot corrosion by means of a method according to the present invention.
  • Fig 1 shows a gas turbine engine rotor blade and the coating of this blade using a first method in accordance with the present invention
  • Fig 2 is a view of a side of the rotor blade of Fig 1 hidden in Fig 1 but to be seen when looking from the right in Fig 1;
  • Fig 3 shows a gas turbine engine rotor blade and the coating of this blade using a second method in accordance with the present invention
  • Fig 4 is a view of a side of the rotor blade of Fig 3 hidden in Fig 3 but to be seen when looking from the right in Fig 3;
  • Fig 5 shows a gas turbine engine rotor blade and the coating of this blade using a third method in accordance with the present invention.
  • Fig 6 is a view of a side of the rotor blade of Fig 5 hidden in Fig 5 but to be seen when looking from the right in Fig 5.
  • the rotor blade coated is a nickel based superalloy rotor blade.
  • the rotor blade may be produced by conventional or directionally solidified (including single crystal) casting techniques. Typical alloys are MarM247, IN6203 and CMSX-4.
  • the blade coated comprises an outer shroud part 1 (above dotted line A) , an aerofoil part 3 (between dotted lines A and B) , a platform part 5 (between dotted lines B and C) , and a root part 7 (below dotted line C) .
  • the blade includes an internal cooling passage 9 which commences as shown in Fig 1, loops within the blade, and exits (exit not shown) via the top side of shroud part 1.
  • chromised i.e. chromium is diffused into the surfaces.
  • This diffusion is achieved by any suitable method, e.g. pack cementation or chemical vapour deposition (CVD) .
  • CVD chemical vapour deposition
  • the layer should typically contain 15 to 30 weight % chromium and be 5 to 25 microns thick.
  • an aluminium diffusion coating is applied to all external surfaces of the blade above dotted line M. This diffusion is again achieved by any suitable method, e.g. pack cementation or CVD. Masking is employed below dotted line M to prevent stray aluminium depositing below this line.
  • a chromium modified aluminide coating results on all external surfaces of the blade above dotted line M.
  • the so called outer beta layer of the chromium modified aluminide coating should typically contain 15 to 30 weight % aluminium and 5 to 15 weight % chromium.
  • the total thickness of the chromium modified aluminide coating, including inter-diffusion zone, should typically be 25 to 100 microns.
  • the blade is heat treated to ensure that it maintains its optimum mechanical properties.
  • the blade coated comprises an outer shroud part 1 (above dotted line A) , an aerofoil part 3 (between dotted lines A and B) , a platform part 5 (between dotted lines B and C) , and a root part 7 (below dotted line C) .
  • the blade includes an internal cooling passage 9 which commences as shown in Fig 3, loops within the blade, and exits (exit not shown) via the top side of shroud part 1.
  • all surfaces of all parts of the blade, including internal cooling passage 9 are chromised, i.e. chromium is diffused into the surfaces. This diffusion is achieved by any suitable method, e.g. pack cementation or CVD. This results in a surface layer rich in chromium.
  • the layer should typically contain 15 to 30 weight % chromium and be 5 to 25 microns thick.
  • an MCrAlY overlay coating (where M is Ni or Co or a combination of the two) is applied to the following parts of the blade: outer shroud part 1, aerofoil part 3, and the top face 11 of platform part 5.
  • the coating suitably comprises 30 to 70 weight % Nickel, 30 to 50 weight % Cobalt, 15 to 25 weight % Chromium, 5 to 15 weight % Aluminium, and up to 1 weight % Yttrium.
  • the coating may additionally include one or more elements selected from the group consisting of rhenium, silicon and hafnium.
  • the coating is applied by any suitable method, e.g.
  • thermal spray techniques such as vacuum plasma spraying (VPS) , low pressure plasma spraying (LPPS) , and high velocity ox-fuel spraying (HVOF) , or by electroplating.
  • VPS vacuum plasma spraying
  • LPPS low pressure plasma spraying
  • HVOF high velocity ox-fuel spraying
  • Masking is employed to ensure that MCrAlY is not deposited on the remainder of platform part 5 below top face 11, and on root part 7.
  • outer shroud part 1, aerofoil part 3, and the top face 11 of platform part 5 are chromised plus have an overlay coating of MCrAlY, whereas the remainder of platform part 5 below top face 11, root part 7, and internal cooling passage 9 are chromised only.
  • the blade coated comprises an outer shroud part 1 (above dotted line A) , an aerofoil part 3 (between dotted lines A and B) , a platform part 5 (between dotted lines B and C) , and a root part 7 (below dotted line C) .
  • the blade includes an internal cooling passage 9 which commences as shown in Fig 5, loops within the blade, and exits (exit not shown) via the top side of shroud part 1.
  • chromised i.e. chromium is diffused into the surfaces. This diffusion is achieved by any suitable method, e.g. pack cementation or CVD. This results in a surface layer rich in chromium. The layer should typically contain 15 to 30 weight % chromium and be 5 to 25 microns thick.
  • an MCrAlY overlay coating (where M is Ni or Co or a combination of the two) is applied to the following parts of the blade: outer shroud part 1, aerofoil part 3, and the top face 11 of platform part 5.
  • the coating suitably comprises 30 to 70 weight % Nickel, 30 to 50 weight % Cobalt, 15 to 25 weight % Chromium, 5 to 15 weight % Aluminium, and up to 1 weight % Yttrium.
  • the coating may additionally include one or more elements selected from the group consisting of rhenium, silicon and hafnium.
  • the coating is applied by any suitable method, e.g. by thermal spray techniques such as VPS, LPPS, and HVOF, or by electroplating. Masking is employed to ensure that MCrAlY is not deposited on the remainder of platform part 5 below top face 11, and on root part 7.
  • those parts of the blade to which the MCrAlY overlay coating was applied are over-aluminised, i.e. an aluminium diffusion coating is applied to these parts.
  • the diffusion is achieved by any suitable method, e.g. pack cementation or CVD.
  • Masking is employed to ensure that stray aluminium is not deposited on the remainder of platform part 5 below top face 11, and on root part 7.
  • the result of the over- aluminisation should be that the outer surface of the MCrAlY overlay coating has an aluminium content of typically 15 to 30 weight %.
  • the total thickness of the over-aluminised MCrAlY coating, including inter-diffusion zone, should typically be 100 to 200 microns.
  • outer shroud part 1, aerofoil part 3, and the top face 11 of platform part 5 are chromised plus have an overlay coating of MCrAlY, which MCrAlY overlay coating has been over-aluminised, whereas the remainder of platform part 5 below top face 11, root part 7, and internal cooling passage 9 are chromised only.
  • the application of further coating (s) in addition to the initial chromium diffusion coating is restricted to regions of the rotor blade not subject to higher physical stress in use of the blade.
  • the diffused aluminium coating is restricted to all external surfaces above dotted line M.
  • the MCrAlY overlay coating is restricted to outer shroud part 1, aerofoil part 3, and the top face 11 of platform part 5.
  • the MCrAlY overlay coating plus over- aluminisation is restricted to outer shroud part 1, aerofoil part 3, and the top face 11 of platform part 5.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Resistance Heating (AREA)

Abstract

200413860 WO 14 Abstract A method of protecting a component against hot corrosion 5 A method of protecting a component against hot corrosion comprising the steps: (a) applying a chromium diffusion coating to the component; and (b) applying a further coating to selected regions of the chromium diffusion coating, the selected regions being chosen dependent on subsequent use of 10 the component. FIG 1
EP05818992A 2004-12-11 2005-12-09 Verfahren zum schutz einer komponente gegen hochtemperaturkorrosion Withdrawn EP1819906A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0427155A GB2421032A (en) 2004-12-11 2004-12-11 A method of protecting a component against hot corrosion
PCT/EP2005/056643 WO2006061431A2 (de) 2004-12-11 2005-12-09 A method of protecting a component against hot corrosion

Publications (1)

Publication Number Publication Date
EP1819906A2 true EP1819906A2 (de) 2007-08-22

Family

ID=34073550

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05818992A Withdrawn EP1819906A2 (de) 2004-12-11 2005-12-09 Verfahren zum schutz einer komponente gegen hochtemperaturkorrosion

Country Status (4)

Country Link
US (1) US20070264126A1 (de)
EP (1) EP1819906A2 (de)
GB (1) GB2421032A (de)
WO (1) WO2006061431A2 (de)

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US10584411B2 (en) * 2014-07-18 2020-03-10 United Technologies Corporation Chromium-enriched diffused aluminide
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Also Published As

Publication number Publication date
WO2006061431A3 (de) 2006-08-24
GB0427155D0 (en) 2005-01-12
GB2421032A (en) 2006-06-14
WO2006061431A2 (de) 2006-06-15
US20070264126A1 (en) 2007-11-15

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