EP1217095A1 - Protective coating for an article used at high temperatures, particularly turbine components - Google Patents

Protective coating for an article used at high temperatures, particularly turbine components Download PDF

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Publication number
EP1217095A1
EP1217095A1 EP01129065A EP01129065A EP1217095A1 EP 1217095 A1 EP1217095 A1 EP 1217095A1 EP 01129065 A EP01129065 A EP 01129065A EP 01129065 A EP01129065 A EP 01129065A EP 1217095 A1 EP1217095 A1 EP 1217095A1
Authority
EP
European Patent Office
Prior art keywords
coating
protective coating
component
sealing
protective
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Withdrawn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
EP01129065A
Other languages
German (de)
French (fr)
Inventor
Hans-Peter Dr. Bossmann
Axel Dr. Kranzmann
Harald Dr. Prof. Reiss
Hans Joachim Dr. Schmutzler
Marianne Dr. Sommer
Ludwig Dr. Weiler
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.)
General Electric Technology GmbH
Original Assignee
Alstom Schweiz AG
Alstom Power NV
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 Alstom Schweiz AG, Alstom Power NV filed Critical Alstom Schweiz AG
Publication of EP1217095A1 publication Critical patent/EP1217095A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • 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
    • F05D2300/20—Oxide or non-oxide ceramics
    • F05D2300/21—Oxide ceramics
    • F05D2300/2112—Aluminium oxides
    • 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
    • F05D2300/20—Oxide or non-oxide ceramics
    • F05D2300/21—Oxide ceramics
    • F05D2300/2118—Zirconium oxides
    • 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
    • F05D2300/20—Oxide or non-oxide ceramics
    • F05D2300/22—Non-oxide ceramics
    • F05D2300/228—Nitrides
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05001—Preventing corrosion by using special lining materials or other techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05004—Special materials for walls or lining
    • 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.]

Definitions

  • the invention relates to a protective coating for a thermally stressed component, in particular turbine component, for protection against corrosion and / or oxidation and / or erosion.
  • Turbine components in particular turbine blades, are in operation of the turbine exposed to corrosive and / or oxidative and / or erosive media.
  • the turbine components consist regularly of materials related to the in operation mechanical loads occurring on the turbine are optimized. These materials, which are based on nickel-based alloys, for example, are relative susceptible to corrosion, oxidation and / or erosion.
  • Usual basic materials for turbine components, especially for turbine blades, are: CM 247, CMSX 4 and IN 738.
  • a protective coating consist of a metallic, crystalline material that is usually used alongside others sufficient chemical elements in the aluminum components and contains chrome.
  • the aluminum provides the desired protection against oxidation, gradually on the outer surface of the protective coating a protective aluminum oxide layer grows up.
  • the alloying element supports this Chrome the formation of the protective aluminum oxide layer.
  • the life of such a protective coating is limited because the protective aluminum oxide layer continues to grow, causing the protective coating more and more aluminum is removed. With that way decreasing aluminum content of the protective coating reduces its strength and therefore their lifetime. By damaging the protective coating the lifespan for the item to be protected is also reduced Component.
  • the invention seeks to remedy this.
  • the present invention deals with deal with the problem for a protective coating of the type mentioned to specify an embodiment that has an increased lifetime.
  • the protective coating a single-layer or multi-layer sealing coating made of an amorphous material.
  • the invention is based on the general idea of the advantageous properties an amorphous structure in materials that protect against Corrosion and / or oxidation and / or erosion are suitable for manufacture a long-lasting protective coating.
  • Amorphous materials or amorphous structures are characterized by a low thermal conductivity, low diffusion speeds as well as high hardness and high thermal Stability.
  • the realization of these properties according to the invention in a corrosion-resistant and / or oxidation-resistant and / or erosion-resistant Material leads to a protective coating with a longer service life.
  • the invention uses the knowledge that the weak points of a conventional Protective coating or the weak points of the component surface are at the grain boundaries at which neighboring crystals of a crystalline Border structure together. For example, there is in the grain boundaries an increased concentration of alloy impurities, as a rule are susceptible to corrosion, oxidation or erosion. Except for monocrystalline Structures always have a large number of crystalline materials on the outside of these grain boundaries that are exposed to the aggressive media. in the In contrast, an amorphous structure has no grain boundaries, which means local Concentrations of impurities and thus weak points in the amorphous sealing coating can be avoided. The amorphous structure the sealing coating thus offers the aggressive media fewer points of attack and therefore has an increased lifetime.
  • such a sealing coating can be of high quality and goodness are produced, which in particular have no holes or gaps having. This can cause diffusion of aggressive atoms or molecules into the Sealing coating into or through the sealing coating be slowed down. Unlike a naturally growing one Aluminum oxide layer in which there are gaps between the crystals that form or holes can occur, this results in a further improvement in Protective effect and thus the lifetime of the protective coating and ultimately of the coated component.
  • the sealing coating on the Be arranged surface of the component hinders the transport of aggressive molecules or atoms, e.g. Oxygen, to the component, so that a long service life is guaranteed for the component can be.
  • aggressive molecules or atoms e.g. Oxygen
  • the protective coating can be in addition to Sealing coating a single-layer or multi-layer component coating Made from a crystalline material that is on the surface of the component is arranged, the sealing coating then on the Component coating is arranged.
  • This component coating can, for example from a conventional protective layer with a crystalline material exist, e.g. B. made of a nickel-based alloy.
  • a such component coating does provide relatively high-quality protection against corrosion, Offer oxidation and erosion, however, due to the free grain boundaries a relatively short lifetime. Due to the sealing coating applied to it are the grain boundaries of this component coating before a direct one Attack protected by the aggressive media, thereby extending the lifetime of this Coating significantly increased.
  • the protective coating according to the invention can additionally a single-layer or multi-layer thermal insulation coating have, which is arranged on the sealing coating.
  • a thermal insulation coating With the help of such a thermal insulation coating, the temperature exposure the sealing layer as well as the component and - if available - also the (conventional) component coating can be reduced. For example thereby necessary mechanical properties of the base material of the Component are guaranteed.
  • Such a thermal insulation coating can, for example consist of stabilized zirconium oxide.
  • the sealing coating is applied to one single-crystal or directionally solidified material applied.
  • FIGS. 1 to 4 one that is only shown in regions Component 1, for example a turbine blade, on its outer surface 2 with a protective coating 3 according to the invention for protection against Corrosion and / or oxidation and / or erosion can be coated.
  • This protective coating 3 has a single-layer or multi-layer sealing coating 4, which are made of an amorphous material or from a material with an amorphous structure.
  • the amorphous sealing coating 4 can from an amorphous metal, from an amorphous transition metal, from one amorphous metal alloy or from an amorphous non-metallic compound or combinations of these materials.
  • Sealing coating 4 made of an aluminum oxide-based or silicon carbon nitride-based Material or from a yttrium oxide-containing or cerium oxide-containing Material.
  • the sealing coating is used to achieve high stability 4 is preferably made relatively thin, i.e. their extension or Thickness perpendicular to the surface 2 of the component 1 is relatively small.
  • the thickness of the sealing coating 4 is less than 20 ⁇ m.
  • An advantage for the sealing coating 4 is a thickness of approximately 0.1 ⁇ m to 10 ⁇ m.
  • the amorphous sealing coating 4 a material is used that is in itself a sufficient thermal Stability as well as sufficient corrosion resistance and / or oxidation resistance and / or has erosion resistance.
  • the protective effect of such Material is significantly improved by the proposed amorphous structure.
  • the protective coating 3 in a first Embodiment exclusively from the sealing coating 4, the is accordingly arranged directly on the surface 2 of the component 1.
  • the Sealing coating 4 for example made of amorphous aluminum oxide or made of amorphous silicon carbon nitride, for example by a physical Steam coating process (“PVD process”) or by a chemical Damf coating process (“CVD process”) applied to component 1 become. Laser PVD processes or laser CVD processes are preferred here. Due to the sealing coating 4, the material of the Component 1 effectively protected against exposure to aggressive media, whereby the component 1 has an increased service life.
  • the protective coating 3 according to the invention can be used in a second Embodiment in addition to the sealing coating 4, a thermal insulation coating 5 have. While the sealing coating 4 on is arranged on the surface 2 of the component 1, there is the thermal insulation coating 5 on the sealing coating 4.
  • the thermal insulation coating 5 can consist, for example, of a stabilized zirconium oxide, conveniently by air plasma spraying, flame spraying or by an electron beam PVD process is applied in one or more layers.
  • the temperature of the sealing coating 4 and the component 1 can be reduced, for example certain required mechanical properties, e.g. Stability, rigidity, Stretch behavior, the sealing layer 4 and the component 1 ensure can.
  • the protective coating 3 according to the invention can be used for a third Embodiment in addition to the sealing coating 4, a component coating 6 have, for example in the manner of a conventional Protective layer is formed from a crystalline material. It is single-layered or multi-layer component coating 6 directly on the Surface 2 of component 1 arranged during the sealing coating 4 is applied to the component coating 6.
  • the sealing coating 4 protects the crystalline component coating 6 and in particular their corrosion-sensitive and / or oxidation-sensitive and / or grain boundaries sensitive to erosion prior to direct exposure with the aggressive media. This increases the life of the crystalline Component coating 6 and thus the service life of component 1.
  • the protective coating 3 according to the invention can be used for a fourth Embodiment in addition to the sealing coating 4 and the component coating 6 again have a thermal insulation coating 5, the crystalline Component coating 6 on the surface 2 of component 1, the amorphous Sealing coating 4 on the component coating 6 and the thermal insulation coating 5 is arranged on the sealing coating 4.
  • the Thermal insulation coating 5 can thus the thermal load on the sealing coating 4, reduce component coating 6 and component 1.

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  • 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)
  • Combustion & Propulsion (AREA)
  • Inorganic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

Protective coating (3) comprises a mono- or multi-layer sealing layer (4) made from an amorphous material. Preferred Features: The sealing layer consists of an amorphous metal, an amorphous transition metal, an amorphous metal alloy and/or a non-metallic compound. The sealing layer is arranged on the surface (2) of the component and is 0.1-10 mu m thick. The sealing layer is made from a material based on aluminum oxide, silicon carbonitride, yttrium oxide or cerium oxide and is applied directly onto a single crystalline or rigid material.

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Schutzbeschichtung für ein thermisch belastetes Bauteil, insbesondere Turbinenbauteil, zum Schutz vor Korrosion und/oder Oxidation und/oder Erosion.The invention relates to a protective coating for a thermally stressed component, in particular turbine component, for protection against corrosion and / or oxidation and / or erosion.

Turbinenbauteile, insbesondere Turbinenschaufeln, sind im Betrieb der Turbine korrosiven und/oder oxidativen und/oder erosiven Medien ausgesetzt. Die Turbinenbauteile bestehen regelmäßig aus Werkstoffen, die hinsichtlich der im Betrieb der Turbine auftretenden mechanischen Belastungen optimiert sind. Diese Werkstoffe, die beispielsweise auf Nickelbasislegierungen basieren, sind jedoch relativ anfällig gegenüber Korrosion, Oxidation und/oder Erosion. Übliche Grundmaterialien für Turbinenbauteile, insbesondere für Turbinenschaufeln, sind: CM 247, CMSX 4 und IN 738. Turbine components, in particular turbine blades, are in operation of the turbine exposed to corrosive and / or oxidative and / or erosive media. The turbine components consist regularly of materials related to the in operation mechanical loads occurring on the turbine are optimized. These materials, which are based on nickel-based alloys, for example, are relative susceptible to corrosion, oxidation and / or erosion. Usual basic materials for turbine components, especially for turbine blades, are: CM 247, CMSX 4 and IN 738.

Stand der TechnikState of the art

Um die Lebensdauer der Turbinenbauteile zu erhöhen, kann deren Korrosionsbeständigkeit durch die Aufbringung einer Schutzbeschichtung der eingangs genannten Art verbessert werden. Bekannte Schutzbeschichtungen bestehen aus einem metallischen, kristallinen Werkstoff, der üblicherweise neben anderen chemischen Elementen hinreichende Gehalte an den Bestandteilen Aluminium und Chrom enthält. Dabei sorgt das Aluminium für den gewünschten Oxidationsschutz, da auf der außenliegenden Oberfläche der Schutzbeschichtung allmählich eine schützende Aluminiumoxidschicht aufwächst. Dabei unterstützt das Legierungselement Chrom die Ausbildung der schützenden Aluminiumoxidschicht. Die Lebensdauer einer solchen Schutzbeschichtung ist jedoch begrenzt, da die schützende Aluminiumoxidschicht permanent weiterwächst, wodurch der Schutzbeschichtung mehr und mehr Aluminium entzogen wird. Mit dem auf diese Weise abnehmenden Aluminiumgehalt der Schutzbeschichtung reduziert sich deren Festigkeit und somit auch deren Lebenszeit. Durch die Beschädigung der Schutzbeschichtung reduziert sich dann auch die Lebensdauer für das zu schützende Bauteil.To increase the lifespan of turbine components, their corrosion resistance by applying a protective coating to the above Kind of be improved. Known protective coatings consist of a metallic, crystalline material that is usually used alongside others sufficient chemical elements in the aluminum components and contains chrome. The aluminum provides the desired protection against oxidation, gradually on the outer surface of the protective coating a protective aluminum oxide layer grows up. The alloying element supports this Chrome the formation of the protective aluminum oxide layer. However, the life of such a protective coating is limited because the protective aluminum oxide layer continues to grow, causing the protective coating more and more aluminum is removed. With that way decreasing aluminum content of the protective coating reduces its strength and therefore their lifetime. By damaging the protective coating the lifespan for the item to be protected is also reduced Component.

Darstellung der ErfindungPresentation of the invention

Hier will die Erfindung Abhilfe schaffen. Die vorliegende Erfindung beschäftigt sich mit dem Problem, für eine Schutzbeschichtung der eingangs genannten Art eine Ausführungsform anzugeben, die eine erhöhte Lebenszeit aufweist.The invention seeks to remedy this. The present invention deals with deal with the problem for a protective coating of the type mentioned to specify an embodiment that has an increased lifetime.

Erfindungsgemäß wird dieses Problem dadurch gelöst, dass die Schutzbeschichtung eine einschichtige oder mehrschichtige Versiegelungsbeschichtung aus einem amorphen Werkstoff aufweist. According to the invention, this problem is solved in that the protective coating a single-layer or multi-layer sealing coating made of an amorphous material.

Die Erfindung beruht auf dem allgemeinen Gedanken, die vorteilhaften Eigenschaften einer amorphen Gefügestruktur bei Werkstoffen, die zum Schutz vor Korrosion und/oder Oxidation und/oder Erosion geeignet sind, zur Herstellung einer langlebigen Schutzbeschichtung auszunutzen. Amorphe Werkstoffe bzw. amorphe Gefügestrukturen zeichnen sich durch eine geringe Wärmeleitfähigkeit, geringe Diffusionsgeschwindigkeiten sowie hohe Härte und hohe thermische Stabilität aus. Die erfindungsgemäße Realisierung dieser Eigenschaften bei einem korrosionsbeständigen und/oder oxidationsbeständigen und/oder erosionsbeständigen Werkstoff führt zu einer Schutzbeschichtung mit erhöhter Lebenszeit.The invention is based on the general idea of the advantageous properties an amorphous structure in materials that protect against Corrosion and / or oxidation and / or erosion are suitable for manufacture a long-lasting protective coating. Amorphous materials or amorphous structures are characterized by a low thermal conductivity, low diffusion speeds as well as high hardness and high thermal Stability. The realization of these properties according to the invention in a corrosion-resistant and / or oxidation-resistant and / or erosion-resistant Material leads to a protective coating with a longer service life.

Die Erfindung nutzt dabei die Erkenntnis, dass die Schwachstellen einer herkömmlichen Schutzbeschichtung bzw. die Schwachstellen der Bauteiloberfläche bei den Korngrenzen liegen, bei denen benachbarte Kristalle einer kristallinen Gefügestruktur aneinander grenzen. In den Korngrenzen herrscht beispielsweise eine erhöhte Konzentration von Legierungsverunreinigungen, die in der Regel anfällig für Korrosion, Oxidation bzw. Erosion sind. Abgesehen von monokristallinen Strukturen weisen kristalline Werkstoffe an ihrer Außenseite stets eine Vielzahl dieser Korngrenzen auf, die den aggressiven Medien ausgesetzt sind. Im Unterschied dazu besitzt ein amorphes Gefüge keine Korngrenzen, wodurch lokale Konzentrationen von Verunreinigungen und somit Schwachstellen in der amorphen Versiegelungsbeschichtung vermieden werden. Die amorphe Gefügestruktur der Versiegelungsbeschichtung bietet den aggressiven Medien somit weniger Angriffsstellen und besitzt dadurch eine erhöhte Lebenszeit.The invention uses the knowledge that the weak points of a conventional Protective coating or the weak points of the component surface are at the grain boundaries at which neighboring crystals of a crystalline Border structure together. For example, there is in the grain boundaries an increased concentration of alloy impurities, as a rule are susceptible to corrosion, oxidation or erosion. Except for monocrystalline Structures always have a large number of crystalline materials on the outside of these grain boundaries that are exposed to the aggressive media. in the In contrast, an amorphous structure has no grain boundaries, which means local Concentrations of impurities and thus weak points in the amorphous sealing coating can be avoided. The amorphous structure the sealing coating thus offers the aggressive media fewer points of attack and therefore has an increased lifetime.

Desweiteren kann eine solche Versiegelungsbeschichtung mit einer hohen Qualität und Güte hergestellt werden, die insbesondere keine Löcher oder Lücken aufweist. Hierdurch kann eine Diffusion aggressiver Atome oder Moleküle in die Versiegelungsbeschichtung hinein bzw. durch die Versiegelungsbeschichtung hindurch verlangsamt werden. Im Unterschied zu einer natürlich wachsenden Aluminiumoxidschicht, bei der zwischen den sich ausbildenden Kristallen Lücken oder Löcher auftreten können, ergibt sich dadurch eine weitere Verbesserung der Schutzwirkung und somit der Lebenszeit der Schutzbeschichtung und letztlich des beschichteten Bauteils.Furthermore, such a sealing coating can be of high quality and goodness are produced, which in particular have no holes or gaps having. This can cause diffusion of aggressive atoms or molecules into the Sealing coating into or through the sealing coating be slowed down. Unlike a naturally growing one Aluminum oxide layer in which there are gaps between the crystals that form or holes can occur, this results in a further improvement in Protective effect and thus the lifetime of the protective coating and ultimately of the coated component.

Bei einer ersten Ausführungsform kann die Versiegelungsbeschichtung auf der Oberfläche des Bauteils angeordnet sein. Die langlebige Versiegelungsbeschichtung behindert den Transport aggressiver Moleküle oder Atome, z.B. Sauerstoff, zum Bauteil, so dass für das Bauteil eine hohe Lebenszeit gewährleistet werden kann.In a first embodiment, the sealing coating on the Be arranged surface of the component. The long-lasting sealing coating hinders the transport of aggressive molecules or atoms, e.g. Oxygen, to the component, so that a long service life is guaranteed for the component can be.

Bei einer zweiten Ausführungsform kann die Schutzbeschichtung zusätzlich zur Versiegelungsbeschichtung eine einschichtige oder mehrschichtige Bauteilbeschichtung aus einem kristallinen Werkstoff aufweisen, die auf der Oberfläche des Bauteils angeordnet ist, wobei die Versiegelungsbeschichtung dann auf der Bauteilbeschichtung angeordnet ist. Diese Bauteilbeschichtung kann beispielsweise aus einer herkömmlichen Schutzschicht mit einem kristallinen Werkstoff bestehen, z. B. aus einer Nickelbasislegierung. Wie eingangs erläutert, kann eine solche Bauteilbeschichtung zwar einen relativ hochwertigen Schutz vor Korrosion, Oxidation und Erosion bieten, besitzt jedoch aufgrund der freien Korngrenzen eine relativ kurze Lebenszeit. Durch die darauf aufgebrachte Versiegelungsbeschichtung sind die Korngrenzen dieser Bauteilbeschichtung vor einem direkten Angriff der aggressiven Medien geschützt, wodurch sich die Lebenszeit dieser Beschichtung deutlich erhöht.In a second embodiment, the protective coating can be in addition to Sealing coating a single-layer or multi-layer component coating Made from a crystalline material that is on the surface of the component is arranged, the sealing coating then on the Component coating is arranged. This component coating can, for example from a conventional protective layer with a crystalline material exist, e.g. B. made of a nickel-based alloy. As explained at the beginning, a such component coating does provide relatively high-quality protection against corrosion, Offer oxidation and erosion, however, due to the free grain boundaries a relatively short lifetime. Due to the sealing coating applied to it are the grain boundaries of this component coating before a direct one Attack protected by the aggressive media, thereby extending the lifetime of this Coating significantly increased.

Bei einer bevorzugten Weiterbildung kann die erfindungsgemäße Schutzbeschichtung zusätzlich eine einschichtige oder mehrschichtige Wärmedämmbeschichtung aufweisen, die auf der Versiegelungsbeschichtung angeordnet ist. Mit Hilfe einer solchen Wärmedämmbeschichtung kann die Temperaturbeaufschlagung der Versiegelungsschicht sowie des Bauteils und - soweit vorhanden - auch der (herkömmlichen) Bauteilbeschichtung reduziert werden. Beispielsweise können dadurch notwendige mechanische Eigenschaften des Grundwerkstoffs des Bauteils gewährleistet werden. Eine solche Wärmedämmbeschichtung kann beispielsweise aus stabilisiertem Zirkonoxid bestehen.In a preferred development, the protective coating according to the invention can additionally a single-layer or multi-layer thermal insulation coating have, which is arranged on the sealing coating. With With the help of such a thermal insulation coating, the temperature exposure the sealing layer as well as the component and - if available - also the (conventional) component coating can be reduced. For example thereby necessary mechanical properties of the base material of the Component are guaranteed. Such a thermal insulation coating can, for example consist of stabilized zirconium oxide.

Um eine hohe mechanische Stabilität für die amorphe Versiegelungsbeschichtung gewährleisten zu können, wird diese relativ dünn ausgebildet. Bevorzugt wird dabei eine dicke von weniger als 20 µm. Von besonderem Vorteil ist eine Versiegelungsbeschichtung mit einer Dicke von etwa 0,1 µm bis 10 µm.To ensure high mechanical stability for the amorphous sealing coating To be able to ensure this is made relatively thin. Prefers becomes a thickness of less than 20 µm. One is particularly advantageous Sealing coating with a thickness of approximately 0.1 µm to 10 µm.

In zweckmässiger Ausgestaltung wird die Versiegelungsbeschichtung auf einen einkristallinen oder gerichtet erstarrten Werkstoff aufgebracht.In an expedient embodiment, the sealing coating is applied to one single-crystal or directionally solidified material applied.

Weitere wichtige Merkmale und Vorteile der erfindungsgemäßen Schutzbeschichtung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the protective coating according to the invention result from the subclaims, from the drawings and from the associated description of the figures using the drawings.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigen, jeweils schematisch,

Fig. 1
eine Schnittansicht auf einen Bereich eines Bauteils, das mit einer Schutzbeschichtung nach der Erfindung ausgestattet ist, bei einer ersten Ausführungsform,
Fig. 2
eine Schnittansicht wie in Fig. 1, jedoch bei einer zweiten Ausführungsform,
Fig. 3
eine Schnittansicht wie in Fig. 1, jedoch bei einer dritten Ausführungsform, und
Fig. 4
eine Schnittansicht wie in Fig. 1, jedoch bei einer vierten Ausführungsform.
Preferred exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the description below. Each shows schematically
Fig. 1
2 shows a sectional view of a region of a component which is equipped with a protective coating according to the invention in a first embodiment,
Fig. 2
2 shows a sectional view as in FIG. 1, but in a second embodiment,
Fig. 3
a sectional view as in Fig. 1, but in a third embodiment, and
Fig. 4
a sectional view as in Fig. 1, but in a fourth embodiment.

Wege zur Ausführung der ErfindungWays of Carrying Out the Invention

Entsprechend den Figuren 1 bis 4 kann ein nur bereichsweise dargestelltes Bauteil 1, beispielsweise eine Turbinenschaufel, an seiner außenliegenden Oberfläche 2 mit einer erfindungsgemäßen Schutzbeschichtung 3 zum Schutz vor Korrosion und/oder Oxidation und/oder Erosion beschichtet sein. Diese Schutzbeschichtung 3 weist eine einschichtige oder mehrschichtige Versiegelungsbeschichtung 4 auf, die aus einem amorphen Werkstoff bzw. aus einem Werkstoff mit amorphem Gefüge besteht. Die amorphe Versiegelungsbeschichtung 4 kann aus einem amorphen Metall, aus einem amorphen Übergangsmetall, aus einer amorphen Metallegierung oder aus einer amorphen nichtmetallischen Verbindung oder aus Kombinationen dieser Materialien bestehen. Vorzugsweise besteht die Versiegelungsbeschichtung 4 aus einem aluminiumoxid-basierten oder siliziumcarbonnitrid-basierten Werkstoff oder aus einem yttriumoxid-haltigen oder ceroxid-haltigen Werkstoff. Zur Erzielung einer hohen Stabilität ist die Versiegelungsbeschichtung 4 vorzugsweise relativ dünn ausgebildet, d.h. ihre Erstreckung bzw. Dicke senkrecht zur Oberfläche 2 des Bauteils 1 ist relativ gering. Beispielsweise beträgt die Dicke der Versiegelungsbeschichtung 4 weniger als 20 µm. Von besonderem Vorteil ist für die Versiegelungsbeschichtung 4 eine Dicke von etwa 0,1 µm bis 10 µm.According to FIGS. 1 to 4, one that is only shown in regions Component 1, for example a turbine blade, on its outer surface 2 with a protective coating 3 according to the invention for protection against Corrosion and / or oxidation and / or erosion can be coated. This protective coating 3 has a single-layer or multi-layer sealing coating 4, which are made of an amorphous material or from a material with an amorphous structure. The amorphous sealing coating 4 can from an amorphous metal, from an amorphous transition metal, from one amorphous metal alloy or from an amorphous non-metallic compound or combinations of these materials. Preferably there is Sealing coating 4 made of an aluminum oxide-based or silicon carbon nitride-based Material or from a yttrium oxide-containing or cerium oxide-containing Material. The sealing coating is used to achieve high stability 4 is preferably made relatively thin, i.e. their extension or Thickness perpendicular to the surface 2 of the component 1 is relatively small. For example the thickness of the sealing coating 4 is less than 20 µm. Of special An advantage for the sealing coating 4 is a thickness of approximately 0.1 µm to 10 µm.

Es ist klar, dass für die Herstellung der amorphen Versiegelungsbeschichtung 4 ein Werkstoff verwendet wird, der an sich bereits eine hinreichende thermische Stabilität sowie ausreichend Korrosionsbeständigkeit und/oder Oxidationsbeständigkeit und/oder Erosionbeständigkeit aufweist. Die Schutzwirkung eines solchen Werkstoffes wird durch das vorgeschlagene amorphe Gefüge deutlich verbessert.It is clear that for the production of the amorphous sealing coating 4 a material is used that is in itself a sufficient thermal Stability as well as sufficient corrosion resistance and / or oxidation resistance and / or has erosion resistance. The protective effect of such Material is significantly improved by the proposed amorphous structure.

Gemäß Fig. 1 besteht die erfindungsgemäße Schutzbeschichtung 3 bei einer ersten Ausführungsform ausschließlich aus der Versiegelungsbeschichtung 4, die dementsprechend direkt auf der Oberfläche 2 des Bauteils 1 angeordnet ist. Die Versiegelungsbeschichtung 4, beispielsweise aus amorphen Aluminiumoxid oder aus amorphen Siliziumcarbonnitrid, kann beispielsweise durch ein physikalisches Dampfbeschichtungsverfahren ("PVD-Verfahren") oder durch ein chemisches Damfbeschichtungsverfahren ("CVD-Verfahren") auf das Bauteil 1 aufgebracht werden. Bevorzugt werden hier Laser-PVD-Verfahren bzw. Laser-CVD-Verfahren. Durch die Versiegelungsbeschichtung 4 wird somit der Werkstoff des Bauteils 1 vor einer Beaufschlagung mit aggressiven Medien effektiv geschützt, wodurch das Bauteil 1 eine erhöhte Standzeit erhält.1 there is the protective coating 3 according to the invention in a first Embodiment exclusively from the sealing coating 4, the is accordingly arranged directly on the surface 2 of the component 1. The Sealing coating 4, for example made of amorphous aluminum oxide or made of amorphous silicon carbon nitride, for example by a physical Steam coating process ("PVD process") or by a chemical Damf coating process ("CVD process") applied to component 1 become. Laser PVD processes or laser CVD processes are preferred here. Due to the sealing coating 4, the material of the Component 1 effectively protected against exposure to aggressive media, whereby the component 1 has an increased service life.

Gemäß Fig. 2 kann die erfindungsgemäße Schutzbeschichtung 3 bei einer zweiten Ausführungsform neben der Versiegelungsbeschichtung 4 eine Wärmedämmbeschichtung 5 aufweisen. Während die Versiegelungsbeschichtung 4 auf der Oberfläche 2 des Bauteils 1 angeordnet ist, befindet sich die Wärmedämmbeschichtung 5 auf der Versiegelungsbeschichtung 4. Die Wärmedämmbeschichtung 5 kann beispielsweise aus einem stabilisierten Zirkonoxid bestehen, das zweckmäßig durch Luftplasmaspritzen, Flammspritzen oder durch ein Elektronenstrahl-PVD-Verfahren einschichtig oder mehrschichtig aufgebracht wird. 2, the protective coating 3 according to the invention can be used in a second Embodiment in addition to the sealing coating 4, a thermal insulation coating 5 have. While the sealing coating 4 on is arranged on the surface 2 of the component 1, there is the thermal insulation coating 5 on the sealing coating 4. The thermal insulation coating 5 can consist, for example, of a stabilized zirconium oxide, conveniently by air plasma spraying, flame spraying or by an electron beam PVD process is applied in one or more layers.

Durch die Wärmedämmbeschichtung 5 kann die Temperatur der Versiegelungsbeschichtung 4 sowie des Bauteils 1 herabgesetzt werden, um beispielsweise bestimmte geforderte mechanische Eigenschaften, z.B. Stabilität, Steifigkeit, Dehnverhalten, der Versiegelungsschicht 4 bzw. des Bauteils 1 gewährleisten zu können.Due to the thermal insulation coating 5, the temperature of the sealing coating 4 and the component 1 can be reduced, for example certain required mechanical properties, e.g. Stability, rigidity, Stretch behavior, the sealing layer 4 and the component 1 ensure can.

Gemäß Fig. 3 kann die erfindungsgemäße Schutzbeschichtung 3 bei einer dritten Ausführungsform zusätzlich zur Versiegelungsbeschichtung 4 eine Bauteilbeschichtung 6 aufweisen, die beispielsweise nach Art einer herkömmlichen Schutzschicht aus einem kristallinen Werkstoff gebildet ist. Dabei ist die einschichtig oder mehrschichtig aufgebaute Bauteilbeschichtung 6 direkt auf der Oberfläche 2 des Bauteils 1 angeordnet, während die Versiegelungsbeschichtung 4 auf die Bauteilbeschichtung 6 aufgetragen ist. Bei dieser Ausführungsform schützt die Versiegelungsbeschichtung 4 die kristalline Bauteilbeschichtung 6 und insbesondere deren korrosionsempfindliche und/oder oxidationsempfindliche und/oder erosionsempfindliche Korngrenzen vor einer direkten Beaufschlagung mit den aggressiven Medien. Hierdurch erhöht sich die Lebensdauer der kristallinen Bauteilbeschichtung 6 und somit die Standzeit des Bauteils 1.3, the protective coating 3 according to the invention can be used for a third Embodiment in addition to the sealing coating 4, a component coating 6 have, for example in the manner of a conventional Protective layer is formed from a crystalline material. It is single-layered or multi-layer component coating 6 directly on the Surface 2 of component 1 arranged during the sealing coating 4 is applied to the component coating 6. In this embodiment the sealing coating 4 protects the crystalline component coating 6 and in particular their corrosion-sensitive and / or oxidation-sensitive and / or grain boundaries sensitive to erosion prior to direct exposure with the aggressive media. This increases the life of the crystalline Component coating 6 and thus the service life of component 1.

Gemäß Fig. 4 kann die erfindungsgemäße Schutzbeschichtung 3 bei einer vierten Ausführungsform neben der Versiegelungsbeschichtung 4 und der Bauteilbeschichtung 6 wieder eine Wärmedämmbeschichtung 5 aufweisen, wobei die kristalline Bauteilbeschichtung 6 auf der Oberfläche 2 des Bauteils 1, die amorphe Versiegelungsbeschichtung 4 auf der Bauteilbeschichtung 6 und die Wärmedämmbeschichtung 5 auf der Versiegelungsbeschichtung 4 angeordnet ist. Die Wärmedämmbeschichtung 5 kann somit die thermische Belastung der Versiegelungsbeschichtung 4, der Bauteilbeschichtung 6 und des Bauteils 1 reduzieren. 4, the protective coating 3 according to the invention can be used for a fourth Embodiment in addition to the sealing coating 4 and the component coating 6 again have a thermal insulation coating 5, the crystalline Component coating 6 on the surface 2 of component 1, the amorphous Sealing coating 4 on the component coating 6 and the thermal insulation coating 5 is arranged on the sealing coating 4. The Thermal insulation coating 5 can thus the thermal load on the sealing coating 4, reduce component coating 6 and component 1.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Bauteilcomponent
22
Oberfläche von 1Surface of 1
33
Schutzbeschichtungprotective coating
44
Versiegelungsbeschichtungseal coat
55
Wärmedämmbeschichtungthermal barrier coating
66
Bauteilbeschichtungcomponent coating

Claims (11)

Schutzbeschichtung für ein thermisch belastetes Bauteil (1), insbesondere Turbinenbauteil, zum Schutz vor Korrosion und/oder Oxidation und/oder Erosion, wobei die Schutzbeschichtung (3) eine einschichtige oder mehrschichtige Versiegelungsbeschichtung (4) aus einem amorphen Werkstoff aufweist.Protective coating for a thermally stressed component (1), in particular Turbine component, for protection against corrosion and / or oxidation and / or erosion, wherein the protective coating (3) is a single-layer or multi-layer sealing coating (4) made of an amorphous material. Schutzbeschichtung nach Anspruch 1,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) aus einem amorphen Metall oder aus einem amorphen Übergangsmetall oder aus einer amorphen Metallegierung oder aus einer nichtmetallischen Verbindung oder aus Kombinationen dieser Materialien besteht.Protective coating according to claim 1,
characterized in that the sealing coating (4) consists of an amorphous metal or an amorphous transition metal or an amorphous metal alloy or a non-metallic compound or combinations of these materials. Schutzbeschichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) auf der Oberfläche (2) des Bauteils (1) angeordnet ist.Protective coating according to claim 1 or 2,
characterized in that the sealing coating (4) is arranged on the surface (2) of the component (1). Schutzbeschichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass die Schutzbeschichtung (3) eine einschichtige oder mehrschichtige Bauteilbeschichtung (6) aus einem kristallinen Werkstoff aufweist, die auf der Oberfläche (2) des Bauteils (1) angeordnet ist, wobei die Versiegelungsbeschichtung (4) auf der Bauteilbeschichtung (6) angeordnet ist. Protective coating according to claim 1 or 2,
characterized in that the protective coating (3) has a single-layer or multi-layer component coating (6) made of a crystalline material, which is arranged on the surface (2) of the component (1), the sealing coating (4) on the component coating (6) is arranged. Schutzbeschichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass die Schutzbeschichtung (3) eine einschichtige oder mehrschichtige Wärmedämmbeschichtung (5) aufweist, die auf der Versiegelungsbeschichtung (4) angeordnet ist.Protective coating according to one of claims 1 to 4,
characterized in that the protective coating (3) has a single-layer or multi-layer thermal insulation coating (5) which is arranged on the sealing coating (4). Schutzbeschichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) relativ dünn ist.Protective coating according to one of claims 1 to 5,
characterized in that the sealing coating (4) is relatively thin. Schutzbeschichtung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) weniger als 20 µm dick ist.Protective coating according to one of claims 1 to 6,
characterized in that the sealing coating (4) is less than 20 µm thick. Schutzbeschichtung nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) etwa 0,1 µm bis 10 µm dick ist.Protective coating according to one of claims 1 to 7,
characterized in that the sealing coating (4) is about 0.1 µm to 10 µm thick. Schutzbeschichtung nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) aus einem oxid-basierten Werkstoff besteht.Protective coating according to one of claims 1 to 8,
characterized in that the sealing coating (4) consists of an oxide-based material. Schutzbeschichtung nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) aus einem aluminiumoxid-basierten oder siliziumcarbonnitrid-basierten Werkstoff oder aus einem yttriumoxid-haltigen oder ceroxid-haltigen Werkstoff besteht.Protective coating according to one of claims 1 to 9,
characterized in that the sealing coating (4) consists of an aluminum oxide-based or silicon carbon nitride-based material or of a yttrium oxide-containing or cerium oxide-containing material. Schutzbeschichtung nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet, dass die Versiegelungsbeschichtung (4) direkt auf einen einkristallinen oder gerichtet erstarrten Werkstoff aufgebracht ist.Protective coating according to one of claims 1 to 10,
characterized in that the sealing coating (4) is applied directly to a single-crystalline or directionally solidified material.
EP01129065A 2000-12-23 2001-12-07 Protective coating for an article used at high temperatures, particularly turbine components Withdrawn EP1217095A1 (en)

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DE10065207 2000-12-23
DE10065207 2000-12-23

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US20020132131A1 (en) 2002-09-19
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