WO2025108596A1 - Two-layer ceramic coating system - Google Patents

Two-layer ceramic coating system Download PDF

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Publication number
WO2025108596A1
WO2025108596A1 PCT/EP2024/074873 EP2024074873W WO2025108596A1 WO 2025108596 A1 WO2025108596 A1 WO 2025108596A1 EP 2024074873 W EP2024074873 W EP 2024074873W WO 2025108596 A1 WO2025108596 A1 WO 2025108596A1
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oxide
layer
ceramic
ytterbium
yttrium
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French (fr)
Inventor
Arturo Flores Renteria
Gregoire Witz
Anirudha Vaidya
Atin SHARMA
Dimitrios Zois
Neil Hitchman
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Siemens Energy Global GmbH and Co KG
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Siemens Energy Global GmbH and Co KG
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • 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
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • C23C28/3215—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer at least one MCrAlX layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B18/00—Layered products essentially comprising ceramics, e.g. refractory products
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
    • C04B35/486—Fine ceramics
    • C04B35/488—Composites
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62222—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining ceramic coatings
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    • 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
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
    • C23C28/3455—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer with a refractory ceramic layer, e.g. refractory metal oxide, ZrO2, rare earth oxides or a thermal barrier system comprising at least one refractory oxide layer
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
    • C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
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    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
    • C04B2235/3246—Stabilised zirconias, e.g. YSZ or cerium stabilised zirconia
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    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/30—Composition of layers of ceramic laminates or of ceramic or metallic articles to be joined by heating, e.g. Si substrates
    • C04B2237/32—Ceramic
    • C04B2237/34—Oxidic
    • C04B2237/345—Refractory metal oxides
    • C04B2237/348—Zirconia, hafnia, zirconates or hafnates
    • 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
    • C23C28/042—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 including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
    • 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
    • C23C28/044—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 coatings specially adapted for cutting tools or wear applications

Definitions

  • Ceramics generally exhibit high temperature stability and are therefore often used as ceramic coatings on high-temperature components, such as in turbines, in particular in gas turbines .
  • the ceramic as a coating on a substrate, which is often a metallic substrate.
  • Metallic bonding layers on the substrate such as those based on NiCoCrAlY, but also ceramic bonding layers or TGO are known .
  • a two-layer coating system consisting of two ceramic layers is also often used.
  • the aim is therefore to improve the thermal insulation properties and service life of two layer-ceramic layer system.
  • Ceramic layers based on zirconium oxide with stabilizers are known, whereby fully stabilized zirconium oxide is often used here due to its better thermal stability.
  • the aim of the idea is to use fully stabilized zirconium oxide with improved, in particular thermal stability, as well as good adhesion to a ceramic sublayer.
  • a ceramic layer 10 is applied to a metallic substrate, preferably using nickel- or cobalt-based superalloys as substrate 4, a metallic bonding layer 7 is present, which forms aluminum oxide (TGO, not shown) .
  • a ceramic top layer 13 can be applied by EB-PVD, plasma spraying (APS, . . . ) , HVOF . . . and preferably has a columnar structure or a segmented structure (DVC) .
  • the porosity of the ceramic top layer 13 is lower than 10%.
  • the ceramic top layer 13 preferably has a layer thickness of 100pm to 1000pm.
  • a ceramic lower layer 10 is also present, but its layer thickness is at least 20% thinner than that of the ceramic top layer 13, which together with the ceramic top layer 13 form the ceramic layer system.
  • a ceramic lower layer 10 can be applied by EB-PVD, plasma spraying (APS, . . . ) , HVOF ... .
  • the porosity of the ceramic lower layer 10 is lower than 10% or not higher than the porosity of the top layer 13. All the following amounts are given in % by weight.
  • the ceramic bottom layer 10 comprises tetragonal zirconium oxide with ytterbium oxide as a stabilizer.
  • the following amounts are used: 11.5% to 13.5% ytterbium oxide. Particularly preferably, 12.5% ytterbium oxide is used. Equally preferably, only ytterbium oxide is used as a stabilizer. Some minor oxide impurities may be present.
  • a ceramic top layer 13 with a cubic structure of zirconium oxide (FSZ) is applied to the ceramic bottom layer 10.
  • the cubic zirconium oxide preferably has a yttrium oxide stabilized zirconium oxide (YSZ) : the proportion of yttrium oxide being 18.0% to 22.0%, in particular 20.0%.
  • YSZ yttrium oxide stabilized zirconium oxide
  • Yttrium oxide represents the largest proportion in comparison to the other two stabilizers.
  • the following proportions are preferably used in each case: 9.0% - 11.0% yttrium oxide, 4.5% - 6.5% ytterbium oxide and 4.0% - 6.0% gadolinium oxide. Particularly preferred are in each case 9.5% - 10.0% yttrium oxide, 5.2% - 6.0% ytterbium oxide and 4.8% - 5.6% gadolinium oxide. Preferably, only these stabilizers yttrium oxide, ytterbium oxide and gadolinium oxide are used. Some minor oxide impurities may be present.
  • the fully stabilized zirconium oxide (FSZ) is preferably also stabilized with 14.0% to 16.0% ytterbium oxide (Yb 2 O 3 ) in particular with 14.5% to 15.5% ytterbium oxide (Yb 2 O 3 ) and stabilized with 4.0% to 6.0% yttrium oxide (Y 2 O 3 ) and optionally hafnium oxide and/or aluminum oxide.
  • the ceramic material preferably comprises 4.5% to 5.5% yttrium oxide (Y 2 O 3 ) .
  • the ceramic material preferably optionally comprises: Hafnium oxide (HfO 2 ) with 0.2% to 4.0%, in particular 0.5% to 2.5% hafnium oxide (HfO 2 ) .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Structural Engineering (AREA)
  • Composite Materials (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention relates to a layer system (1) comprising at least (in % by weight): a metallic substrate (4), optionally a metallic bonding layer (7) on the substrate (4) and a ceramic bottom layer (10) of partially stabilized, tetragonal zirconium oxide, with ytterbium oxide as stabilizer and a ceramic top layer (13) of fully stabilized cubic zirconium oxide on the ceramic bottom layer (10) wherein the proportion of stabilizers is between 17.5% and 25.5%.

Description

Two-layer ceramic coating system
The invention relates to a two-layer ceramic coating system.
Ceramics generally exhibit high temperature stability and are therefore often used as ceramic coatings on high-temperature components, such as in turbines, in particular in gas turbines .
Important in this type of application is the use of the ceramic as a coating on a substrate, which is often a metallic substrate.
Metallic bonding layers on the substrate, such as those based on NiCoCrAlY, but also ceramic bonding layers or TGO are known .
A two-layer coating system consisting of two ceramic layers is also often used.
Fully stabilized ceramic zirconium oxide layers with 20YSZ are state of the art, but need to be improved in terms of bonding to a ceramic sublayer.
The aim is therefore to improve the thermal insulation properties and service life of two layer-ceramic layer system.
It is therefore the task of the invention to solve the above- mentioned problem.
The problem is solved by a layer system according to claim 1
Ceramic layers based on zirconium oxide with stabilizers are known, whereby fully stabilized zirconium oxide is often used here due to its better thermal stability. However, the aim of the idea is to use fully stabilized zirconium oxide with improved, in particular thermal stability, as well as good adhesion to a ceramic sublayer.
The figure schematically shows an example of the invention.
The figure and the description are only examples of the invention .
In a layer system 1, a ceramic layer 10 is applied to a metallic substrate, preferably using nickel- or cobalt-based superalloys as substrate 4, a metallic bonding layer 7 is present, which forms aluminum oxide (TGO, not shown) .
The metallic bonding layer 7 is preferably also an aluminide, platinum aluminide or a NiCoCrAlY-X alloy as a base, optionally with x = Ta, Re, Fe and/or Si.
A ceramic top layer 13 can be applied by EB-PVD, plasma spraying (APS, . . . ) , HVOF . . . and preferably has a columnar structure or a segmented structure (DVC) .
Preferably the porosity of the ceramic top layer 13 is lower than 10%.
The ceramic top layer 13 preferably has a layer thickness of 100pm to 1000pm.
A ceramic lower layer 10 is also present, but its layer thickness is at least 20% thinner than that of the ceramic top layer 13, which together with the ceramic top layer 13 form the ceramic layer system.
A ceramic lower layer 10 can be applied by EB-PVD, plasma spraying (APS, . . . ) , HVOF ... .
Preferably the porosity of the ceramic lower layer 10 is lower than 10% or not higher than the porosity of the top layer 13. All the following amounts are given in % by weight.
The ceramic bottom layer 10 comprises tetragonal zirconium oxide with ytterbium oxide as a stabilizer.
The following amounts are used: 11.5% to 13.5% ytterbium oxide. Particularly preferably, 12.5% ytterbium oxide is used. Equally preferably, only ytterbium oxide is used as a stabilizer. Some minor oxide impurities may be present.
A ceramic top layer 13 with a cubic structure of zirconium oxide (FSZ) is applied to the ceramic bottom layer 10.
The cubic zirconium oxide preferably has a yttrium oxide stabilized zirconium oxide (YSZ) : the proportion of yttrium oxide being 18.0% to 22.0%, in particular 20.0%. Preferably, only yttrium oxide is used as a stabilizer. Some minor oxide impurities may be present.
It is also possible to use cubic zirconium oxide with stabilizers of yttrium oxide, ytterbium oxide and gadolinium oxide :
Yttrium oxide represents the largest proportion in comparison to the other two stabilizers.
Preferably, only these stabilizers are used.
The following proportions are preferably used in each case: 9.0% - 11.0% yttrium oxide, 4.5% - 6.5% ytterbium oxide and 4.0% - 6.0% gadolinium oxide. Particularly preferred are in each case 9.5% - 10.0% yttrium oxide, 5.2% - 6.0% ytterbium oxide and 4.8% - 5.6% gadolinium oxide. Preferably, only these stabilizers yttrium oxide, ytterbium oxide and gadolinium oxide are used. Some minor oxide impurities may be present. The fully stabilized zirconium oxide (FSZ) is preferably also stabilized with 14.0% to 16.0% ytterbium oxide (Yb2O3) in particular with 14.5% to 15.5% ytterbium oxide (Yb2O3) and stabilized with 4.0% to 6.0% yttrium oxide (Y2O3) and optionally hafnium oxide and/or aluminum oxide.
The ceramic material preferably comprises 4.5% to 5.5% yttrium oxide (Y2O3) .
The ceramic material preferably optionally comprises: Hafnium oxide (HfO2) with 0.2% to 4.0%, in particular 0.5% to 2.5% hafnium oxide (HfO2) .
Example for underlayer 10:
12.4% Yb2O3 - ZrO2 examples for top layer 13 in combination with the example above :
20.1% Y2O3 - ZrO2 or
15.0% Yb2O3 / 4.9% Y2O3 - ZrO2 or
10.0% Y2O3 / 5.5% Yb2O3 / 5.3% Gd2O3 - ZrO2 for which good properties were achieved.

Claims

1. Layer system (1) comprising at least (in % by weight) a metallic substrate (4) , optionally a metallic bonding layer (7) on the substrate (4) and a ceramic underlayer (10) of partially stabilized, tetragonal zirconium oxide, with ytterbium oxide as stabilizer, preferably 11.5% - 13.5% ytterbium oxide, particularly preferably 12.5% ytterbium oxide, and a ceramic top layer (13) of fully stabilized cubic zirconium oxide on the ceramic bottom layer (10) , wherein the proportion of stabilizers of the ceramic top layer (13) is between 17.5% and 26.0%.
2. Layer system according to claim 1, in which only ytterbium oxide is used as a stabilizer for the ceramic sublayer (10) .
3. Layer system according to one or both of claims 1 or 2, in which the ceramic top layer (13) comprises (in % by weight) yttrium oxide stabilized zirconium oxide, wherein the proportion of yttrium oxide is 18.0 wt . % to 22.0 wt . % , in particular 20.0% by weight, in particular only yttrium oxide is used.
4. Layer system according to one or both of claims 1 or 2, in which the ceramic top layer (13) comprises (in % by weight) zirconium oxide, wherein stabilizers of yttrium oxide, ytterbium oxide and gadolinium oxide are present, wherein preferably the following proportions are given: 9.0% - 11.0% yttrium oxide, 4.5% - 6.5% ytterbium oxide and 4.0% - 6.0% gadolinium oxide, preferably 9.75% - 10.0% yttrium oxide, preferably 5.2% to 6.0% ytterbium oxide and preferably 4.8% - 5.6% gadolinium oxide are present in each case, in particular only these three stabilizers yttrium oxide, ytterbium oxide and gadolinium oxide are used.
5. Layer system according to one or both of claims 1 or 2, wherein the ceramic top layer (13) comprises zirconium oxide , wherein stabilizers (in % by weight) of yttrium oxide and ytterbium oxide are present, wherein preferably the following proportions are given: ytterbium oxide (Yb2O3) with 14.0% to 16.0%, in particular with 14.5% to 15.5% ytterbium oxide as well as with 4.0% to 6.0% yttrium oxide and optionally hafnium oxide and/or aluminum oxide.
6. Layer system according to claim 5, in which the ceramic top layer (13) comprises zirconium oxide (in % by weight) , wherein stabilizers of yttrium oxide and ytterbium oxide are present, wherein the following proportions are given: 15% ytterbium oxide, 4.5% to 5.5% yttrium oxide, optionally hafnium oxide with 0.2% to 4.0%, in particular 0.5% to 2.5% hafnium oxide.
7. Layer system according to one or more of claims 1, 2, 3, 4 , 5 or 6 , comprising a metallic adhesion promoter layer (7) between the ceramic underlayer (10) and the metallic substrate (4) , in particular directly on the substrate (4) , wherein the adhesion promoter layer (7) comprises an alloy of the type NiCoCrAlY-X,
X is optionally and selected from the group: Ta, Re and/or Si, in particular NiCoCrAlY or NiCoCrAlY-Ta .
8. Layer system according to one or more of the claims 1, 2, 3, 4, 5, 6 or 7, in which the ceramic sublayer (10) under the ceramic layer (13) is at least 20% thinner.
PCT/EP2024/074873 2023-11-20 2024-09-05 Two-layer ceramic coating system Pending WO2025108596A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6887595B1 (en) * 2003-12-30 2005-05-03 General Electric Company Thermal barrier coatings having lower layer for improved adherence to bond coat
US20220041510A1 (en) * 2018-12-17 2022-02-10 Siemens Energy Global GmbH & Co. KG Ceramic material, layer and layer system
WO2022174996A1 (en) * 2021-02-18 2022-08-25 Siemens Energy Global GmbH & Co. KG Ceramic material, powder and layer system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6887595B1 (en) * 2003-12-30 2005-05-03 General Electric Company Thermal barrier coatings having lower layer for improved adherence to bond coat
US20220041510A1 (en) * 2018-12-17 2022-02-10 Siemens Energy Global GmbH & Co. KG Ceramic material, layer and layer system
WO2022174996A1 (en) * 2021-02-18 2022-08-25 Siemens Energy Global GmbH & Co. KG Ceramic material, powder and layer system

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