EP2524063A1 - Alliage, couche protectrice et élément - Google Patents

Alliage, couche protectrice et élément

Info

Publication number
EP2524063A1
EP2524063A1 EP11700398A EP11700398A EP2524063A1 EP 2524063 A1 EP2524063 A1 EP 2524063A1 EP 11700398 A EP11700398 A EP 11700398A EP 11700398 A EP11700398 A EP 11700398A EP 2524063 A1 EP2524063 A1 EP 2524063A1
Authority
EP
European Patent Office
Prior art keywords
protective layer
alloy according
component
layer
cobalt
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Withdrawn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
EP11700398A
Other languages
German (de)
English (en)
Inventor
Friedhelm Schmitz
Werner Stamm
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
Priority to EP11700398A priority Critical patent/EP2524063A1/fr
Publication of EP2524063A1 publication Critical patent/EP2524063A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component

Definitions

  • the invention relates to an alloy according to claim 1, a protective layer for protecting a component against corrosion and / or oxidation, in particular at high temperatures, according to claim 10 and a component according to claim 11.
  • Protective layers for metallic components which are intended to increase their corrosion resistance and / or oxidation resistance are known in large numbers in the prior art. Most of these protective layers are known under the collective name MCrAlY, where M represents at least one of the elements selected from the group consisting of iron, cobalt and nickel and further essential components are chromium, aluminum and yttrium.
  • a protective layer In addition to the sufficient chemical resistance of a protective layer under the attacks that are expected of flue gases at temperatures in the order of 1000 ° C, a protective layer must also have sufficient mechanical properties, not least in view of the mechanical interaction between the protective layer and the base material , to have. In particular, the protective layer must be sufficiently ductile in order to be able to follow any deformations of the base material and not to break, since in this way points of attack for oxidation and corrosion would be created.
  • an object of the present invention to provide an alloy and a protective layer which has good high-temperature resistance in corrosion and oxidation, has good long-term stability and, in addition, a mechanical stress to be expected particularly in a gas turbine at a high temperature well adjusted.
  • the object is achieved by an alloy according to claim 1 and a protective layer according to claim 10.
  • Another object of the invention is to provide a component which has increased protection against corrosion and oxidation.
  • a component according to claim ⁇ 11 in particular a component of a gas turbine or steam turbine, the protection against corrosion and oxidation at high temperatures, a protective layer ofdonthane ⁇ nen type has.
  • the invention is inter alia based on the finding that the protective layer in the layer and in the transition region see be- shows protective layer and the base material brittle rhenium from ⁇ decisions.
  • these brittle phases which form increasingly with time and temperature, lead to pronounced longitudinal cracks in the layer as well as in the interface layer base material with subsequent detachment of the layer.
  • carbon which can hineindif ⁇ substantiate from the base material in the layer or during a heat treatment in the furnace by the surface diffuses into the layer, in addition, the brittleness of the rhenium precipitations increases. Oxidation of the rhenium phases further enhances the driving force for crack formation.
  • FIG. 1 shows a layer system with a protective layer
  • FIG. 2 shows compositions of superalloys
  • FIG. 3 shows a gas turbine
  • Figure 4 shows a turbine blade
  • Figure 5 is a combustion chamber.
  • Y yttrium
  • Y yttrium
  • Nickel (Ni) (NiCoCrAlY).
  • yttrium At higher oxidation load (pure combustion gas), more oxygen must be bound by yttrium, so that the protective aluminum oxide layer can not grow too fast, and then the yttrium value is advantageously up to 0.7wt%.
  • the content of yttrium should generally not be too high in the alloy, otherwise this leads to embrittlement.
  • a preferred embodiment is: Ni - 20Co - 24Cr - 7A1 - 0.6Y. It should be noted that the proportions of the individual elements are specially tuned with regard to their effects, which are to be seen in particular in connection with the non-existent element rhenium. If the proportions are so large, can be dispensed with the addition of rhenium (Re), so that no rhenium precipitates form. There are advantageously no brittle phases during the use of the protective layer, so that the runtime behavior is improved and extended. In interaction with the reduction of the brittle phases, which have a negative effect especially under higher mechanical properties, by reducing the mechanical Stresses due to the selected nickel content improves the mechanical properties.
  • the protective layer with good corrosion resistance, has a particularly good resistance to oxidation and is also distinguished by particularly good ductility properties, so that it is particularly qualified for use in a gas turbine 100 (FIG. 3) with a further increase in the inlet temperature.
  • the powders are applied for example by plasma spraying (APS, LPPS, VPS, ).
  • Other methods are also conceivable (PVD, CVD, cold gas spraying, ).
  • the protective layer 7 described also acts as Haftvermitt ⁇ Lersch layer to a superalloy.
  • only a single protective layer 7 is used for the component, ie no duplex layer for the bondcoat.
  • this protective layer 7 other layers insbeson ⁇ particular ceramic thermal barrier coatings 10 may be applied.
  • the protective layer 7 is advantageous ⁇ as applied to a substrate 4 made of a superalloy tion on nickel or cobalt base.
  • composition is suitable as substrate (data in wt%):
  • Nickel Compositions of this type are be ⁇ known as casting alloys under the names GTD222, IN939, IN6203 and Udimet 500th
  • the thickness of the protective layer 7 on the component 1 is the thickness of the protective layer 7 on the component 1
  • the protective layer 7 is particularly suitable for protecting the component 1, 120, 130, 155 against corrosion and oxidation, while the component at a material temperature of about 950 ° C, in aircraft turbines also about 1100 ° C, with a
  • the protective layer 7 according to the invention is thus particularly qualified for protecting a component of a gas turbine 100, in particular a guide blade 120, blade 130 or a heat shield element 155, which is acted upon with hot gas before or in the turbine of the gas turbine 100 or the steam turbine ⁇ .
  • the protective layer 7 can be used as an overlay (protective layer is the outer layer or as a bondcoat (protective layer is an intermediate layer).
  • FIG. 1 shows a layer system 1 as a component.
  • the layer system 1 consists of a substrate 4.
  • the substrate 4 may be metallic and / or ceramic. Particularly in the case of turbine components, such as turbine runners 120 (FIG. 4) or guide vanes 130 (FIGS. 3, 4), heat shield elements 155 (FIG. 5) and other housing parts of a steam or gas turbine 100 (FIG. 3)
  • Substrate 4 made of a nickel-, cobalt- or iron-based superalloy. Preferably, nickel-based superalloys are used.
  • the protective layer 7 is present on the substrate 4, the protective layer 7 according to the invention is present. It is preferably as "single" layer USAGE ⁇ det, ie there is no further metallic layer.
  • this protective layer 7 is applied by plasma spraying (VPS, LPPS, APS1,).
  • a ceramic thermal barrier coating 10 is present on the protective layer 7.
  • the protective layer 7 can be applied to newly produced components and refurbished components from the refurbishment.
  • Refurbishment means that components 1 are optionally separated from layers (thermal barrier coating) after use and that corrosion and oxidation products are removed, for example by acid treatment (acid stripping). If necessary, cracks still have to be repaired. Thereafter, such a component can be coated again because the substrate 4 is very expensive.
  • FIG. 3 shows by way of example a gas turbine 100 in a longitudinal partial section.
  • the gas turbine 100 has a rotatably mounted about a rotational axis 102 ⁇ rotor 103 having a shaft 101, which is also referred to as the turbine rotor.
  • an intake housing 104 a compressor 105, for example, a toroidal combustion chamber 110, in particular annular combustion chamber, with a plurality of coaxially arranged burners 107, a turbine 108 and the exhaust housing 109th
  • a compressor 105 for example, a toroidal combustion chamber 110, in particular annular combustion chamber, with a plurality of coaxially arranged burners 107, a turbine 108 and the exhaust housing 109th
  • the annular combustion chamber 110 communicates with an annular annular hot gas channel 111, for example.
  • An annular annular hot gas channel 111 for example.
  • turbine stages 112 connected in series form the turbine 108.
  • Each turbine stage 112 is formed, for example, from two blade rings .
  • a series 125 formed of rotor blades 120 follows.
  • the guide vanes 130 are fastened to an inner housing 138 of a stator 143, whereas the moving blades 120 of a row 125 are attached to the rotor 103 by means of a turbine disk 133, for example.
  • the gas turbine 100 air is sucked in by the compressor 105 through the intake housing 104 and compressed.
  • the 105 ⁇ be compressed air provided at the turbine end of the compressor is ge ⁇ leads to the burners 107, where it is mixed with a fuel.
  • the mixture is then burned to form the working fluid 113 in the combustion chamber 110.
  • the working medium 113 flows along the hot gas channel 111 past the guide vanes 130 and the rotor blades 120.
  • the working medium 113 expands in a pulse-transmitting manner so that the rotor blades 120 drive the rotor 103 and drive the machine coupled to it.
  • the components exposed to the hot working medium 113 are subject to thermal loads during operation of the gas turbine 100.
  • the guide vanes 130 and rotor blades 120 of the first turbine stage 112, viewed in the flow direction of the working medium 113, are subjected to the greatest thermal stress in addition to the heat shield elements lining the annular combustion chamber 110.
  • substrates of the components can have a directional structure, ie they are monocrystalline (SX structure) or have only longitudinal grains (DS structure).
  • SX structure monocrystalline
  • DS structure longitudinal grains
  • iron-, nickel- or cobalt-based superalloys are used as a material for the components.
  • Such superalloys are known, for example, from EP 1 204 776 B1, EP 1 306 454, EP 1 319 729 A1, WO 99/67435 or WO 00/44949.
  • the guide vane 130 has an inner housing 138 of the turbine 108 facing guide vane root (not Darge here provides ⁇ ) and a side opposite the guide-blade root vane root.
  • the vane head faces the rotor 103 and fixed to a mounting ring 140 of the stator 143.
  • FIG. 4 shows a perspective view of a rotor blade 120 or guide vane show ⁇ 130 of a turbomachine, which extends along a longitudinal axis of the 121st
  • the turbomachine may be a gas turbine of an aircraft or a power plant for power generation, a steam turbine or a compressor.
  • the blade 120, 130 has along the longitudinal axis 121 to each other, a securing region 400, an adjoining blade or vane platform 403 and a blade 406 and a blade tip 415.
  • the vane 130 may be pointed on its shovel 415 have a further platform (not Darge ⁇ asserted).
  • a blade root 183 is formed, which serves for attachment of the blades 120, 130 to a shaft or a disc (not shown).
  • the blade root 183 is, for example, as a hammerhead out staltet ⁇ . Other designs as Christmas tree or Schwalbenschwanzfuß are possible.
  • the blade 120, 130 has for a medium which flows past the scene ⁇ felblatt 406 on a leading edge 409 and a trailing edge 412th
  • massive metallic materials in particular superalloys, are used.
  • Such superalloys are known, for example, from EP 1 204 776 B1, EP 1 306 454, EP 1 319 729 A1, WO 99/67435 or WO 00/44949.
  • the blade 120, 130 can hereby be manufactured by a casting process, also by directional solidification, by a forging process, by a milling process or combinations thereof.
  • Workpieces with a monocrystalline structure or structures are used as components for machines which are exposed to high mechanical, thermal and / or chemical stresses during operation.
  • Such monocrystalline workpieces takes place e.g. by directed solidification from the melt.
  • These are casting processes in which the liquid metallic alloy is transformed into a monocrystalline structure, i. to the single-crystal workpiece, or directionally solidified.
  • dendritic crystals are aligned along the heat flow and form either a columnar grain structure (columnar, ie grains that run the entire length of the workpiece and here, for general language use, referred to as directionally solidified) or a monocrystalline structure, ie the entire workpiece ⁇ is of a single crystal.
  • a columnar grain structure columnar, ie grains that run the entire length of the workpiece and here, for general language use, referred to as directionally solidified
  • a monocrystalline structure ie the entire workpiece ⁇ is of a single crystal.
  • the blades 120, 130 may have protection layers 7 according to the invention against corrosion or oxidation.
  • the density is preferably 95% of the theoretical
  • TGO thermal grown oxide layer
  • a thermal barrier coating which is preferably the outermost layer, and consists for example of Zr0 2 , Y2Ü3-Zr02, ie it is not, partially ⁇ or fully stabilized by yttria
  • the thermal barrier coating covers the entire MCrAlX layer.
  • Electron beam evaporation produces stalk-shaped grains in the thermal barrier coating.
  • the heat insulation layer may have ⁇ porous, micro- or macro-cracked compatible grains for better thermal shock resistance.
  • the thermal barrier coating is therefore preferably more porous than the
  • the blade 120, 130 may be hollow or solid. If the blade 120, 130 is to be cooled, it is hollow and also has, if necessary, film cooling holes 418 (indicated by dashed lines) on.
  • the combustion chamber 110 is configured, for example, as so-called an annular combustion chamber, in which a plurality of in the circumferential direction about an axis of rotation 102 arranged burners 107 open into a common combustion chamber space 154, the flames 156 generate.
  • the combustion chamber 110 is configured in its entirety as an annular structure, which is positioned around the axis of rotation 102 around.
  • the combustion chamber 110 is designed for a comparatively high temperature of the working medium M of about 1000 ° C to 1600 ° C.
  • a relatively long service life loan to enable the combustion chamber wall 153 is provided on its side facing the working medium M facing side with a formed from heat shield elements 155. liner.
  • the heat shield elements 155 are then, for example, hollow and possibly still have cooling holes (not shown) which open into the combustion chamber space 154.
  • Each heat shield element 155 made of an alloy is equipped on the working fluid side with a particularly heat-resistant protective layer (MCrAlX layer and / or ceramic coating) or is made of high-temperature-resistant material (solid ceramic blocks).
  • These protective layers 7 may be similar to the turbine blades.
  • a ceramic Wär ⁇ medämm Anlagen be present and consists for example of ZrÜ2, Y203-ZrÜ2, ie it is not, partially or fully ⁇ dig stabilized by yttrium and / or calcium oxide and / or magnesium oxide.
  • Electron beam evaporation produces stalk-shaped grains in the thermal barrier coating.
  • the heat insulation layer may have ⁇ porous, micro- or macro-cracked compatible grains for better thermal shock resistance.
  • Reprocessing means that turbine blades 120, 130, heat shield elements have to be removed from 155, after ⁇ A set of protective layers (for example by sandblasting). This is followed by removal of the corrosion and / or oxidation layers or products.
  • cracks in the turbine blade 120, 130 or the heat shield element 155 are also repaired. This is followed by a re-coating of the turbine blades 120, 130, heat shield elements 155 and a renewed use of the turbine blades 120, 130 or the heat shield elements 155.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

Des couches protectrices connues avec une teneur élevée en Cr et en plus du silicium forment des phases fragiles qui se fragilisent encore plus sous l'influence du carbone pendant l'utilisation. La couche protectrice selon l'invention a la composition suivante: de 18% à 20% de cobalt (Co), de 6% à 8% d'aluminium (Al), de 0,5% à 0,7% d'yttrium (Y), de 22% à 26% de chrome (Cr), le reste étant du Nickel.
EP11700398A 2010-01-12 2011-01-10 Alliage, couche protectrice et élément Withdrawn EP2524063A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11700398A EP2524063A1 (fr) 2010-01-12 2011-01-10 Alliage, couche protectrice et élément

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10000223A EP2354260A1 (fr) 2010-01-12 2010-01-12 Alliage, couche de protection et composant
EP11700398A EP2524063A1 (fr) 2010-01-12 2011-01-10 Alliage, couche protectrice et élément
PCT/EP2011/050221 WO2011086045A1 (fr) 2010-01-12 2011-01-10 Alliage, couche protectrice et élément

Publications (1)

Publication Number Publication Date
EP2524063A1 true EP2524063A1 (fr) 2012-11-21

Family

ID=42078995

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10000223A Withdrawn EP2354260A1 (fr) 2010-01-12 2010-01-12 Alliage, couche de protection et composant
EP11700398A Withdrawn EP2524063A1 (fr) 2010-01-12 2011-01-10 Alliage, couche protectrice et élément

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10000223A Withdrawn EP2354260A1 (fr) 2010-01-12 2010-01-12 Alliage, couche de protection et composant

Country Status (3)

Country Link
US (1) US20120328900A1 (fr)
EP (2) EP2354260A1 (fr)
WO (1) WO2011086045A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112015022549A2 (pt) 2013-03-13 2017-07-18 Gen Electric componente de turbina e turbina a gás

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034142A (en) 1975-12-31 1977-07-05 United Technologies Corporation Superalloy base having a coating containing silicon for corrosion/oxidation protection
US4005989A (en) 1976-01-13 1977-02-01 United Technologies Corporation Coated superalloy article
US4451299A (en) * 1982-09-22 1984-05-29 United Technologies Corporation High temperature coatings by surface melting
CA2060884A1 (fr) 1989-07-25 1991-01-26 Frederick G. Borns Ailette de turbine a double alliage
JP3370676B2 (ja) * 1994-10-14 2003-01-27 シーメンス アクチエンゲゼルシヤフト 腐食・酸化及び熱的過負荷に対して部材を保護するための保護層並びにその製造方法
EP0861927A1 (fr) 1997-02-24 1998-09-02 Sulzer Innotec Ag Procédé de fabrication de structures monocristallines
EP0892090B1 (fr) 1997-02-24 2008-04-23 Sulzer Innotec Ag Procédé de fabrication de structure monocristallines
WO1999067435A1 (fr) 1998-06-23 1999-12-29 Siemens Aktiengesellschaft Alliage a solidification directionnelle a resistance transversale a la rupture amelioree
US6231692B1 (en) 1999-01-28 2001-05-15 Howmet Research Corporation Nickel base superalloy with improved machinability and method of making thereof
EP1204776B1 (fr) 1999-07-29 2004-06-02 Siemens Aktiengesellschaft Piece resistant a des temperatures elevees et son procede de production
DE50104022D1 (de) 2001-10-24 2004-11-11 Siemens Ag Rhenium enthaltende Schutzschicht zum Schutz eines Bauteils gegen Korrosion und Oxidation bei hohen Temperaturen
DE50112339D1 (de) 2001-12-13 2007-05-24 Siemens Ag Hochtemperaturbeständiges Bauteil aus einkristalliner oder polykristalliner Nickel-Basis-Superlegierung
JP2009242836A (ja) * 2008-03-28 2009-10-22 Mitsubishi Heavy Ind Ltd 耐高温腐食合金材、遮熱コーティング材、タービン部材、及びガスタービン
WO2009141197A1 (fr) * 2008-05-20 2009-11-26 Siemens Aktiengesellschaft Couche de mcralx composée de deux strates présentant différentes teneurs en cobalt et en nickel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011086045A1 *

Also Published As

Publication number Publication date
EP2354260A1 (fr) 2011-08-10
US20120328900A1 (en) 2012-12-27
WO2011086045A1 (fr) 2011-07-21

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