EP4781005A1 - Bilayer thermal barrier coating - Google Patents

Bilayer thermal barrier coating

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Publication number
EP4781005A1
EP4781005A1 EP24769362.5A EP24769362A EP4781005A1 EP 4781005 A1 EP4781005 A1 EP 4781005A1 EP 24769362 A EP24769362 A EP 24769362A EP 4781005 A1 EP4781005 A1 EP 4781005A1
Authority
EP
European Patent Office
Prior art keywords
ceramic
top layer
zro2
bottom layer
zro
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.)
Pending
Application number
EP24769362.5A
Other languages
German (de)
French (fr)
Inventor
Arturo Flores Renteria
Stefan Werner Kiliani
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 Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP4781005A1 publication Critical patent/EP4781005A1/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—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
    • C23C28/042—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
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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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    • C04B35/48—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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    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
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    • C—CHEMISTRY; METALLURGY
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    • 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
    • C23C28/048—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 with layers graded in composition or physical properties
    • 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
    • F01D5/284—Selection of ceramic materials
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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
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • 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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    • C04B2235/32—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

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Abstract

The invention relates to a two layered TBC system (1) comprising a metallic substrate (4), a ceramic bottom layer (10) on the metallic substrate (4), which is made of either PSZ, or (2 – 10)wt% Yb2O3 + (2 – 10)wt% Y2O3 / ZrO2 or (2 – 10)wt% Er2O3 + (2 – 10)wt% Y2O3 / ZrO2 or (2 – 10)wt% (Yb2O3 + Er2O3) + (2 – 10)wt% Y2O3/ ZrO2 and a ceramic top layer (13) on the ceramic bottom layer (10), wherein the ceramic top layer (13) is made of either (2 – 50)wt% (Yb2O3 + Y2O3) / ZrO2 or (2 – 50)wt% (Er2O3 + Y2O3) / ZrO2 or (2 – 50)wt% (Yb2O3 + Er2O3 + Y2O3) / ZrO2.

Description

2023PF12243 1 Bilayer TBC The invention relates to a bilayer TBC with different amounts of stabilizers. Thermal barrier coatings (TBC) are designed to fulfill the demanding working conditions of first stage components of high-efficient gas turbines. It is known that one method to enhance the efficiency of these engines is the increase of Turbine Inlet Temperature (TIT), which represents an increment of the temperature of these deposited on the surface of the turbine airfoils and the walls of the combustor. Often Yttrium stabilized Zirconia (YSZ) is used. But there is a certain instability of the standard 8YSZ coating, which is of a PSZ type (PSZ = Partially stabilized Zirconia) to remain stable at extreme high temperatures and to remain stable for a long period of time. There are also known limitations of the standard 8YSZ - TBCs, like the phase transfor- mation at T > 1473K. Thus, the use of a bilayer TBC with a top layer of a chemical composition capable to with- stand the phase transformation and to remain stable for a long period of time at extreme high temperatures is needed. It is known that other TBC`s are using a 20YSZ (= FSZ, Fully Stabilized Zirconia), or a Ta2O5 containing TBC to solve this issue. EP 944746 B1 discloses Gadolinium Zirconate as TBC and EP 1707653 B1 the same ma- terial with YSZ as ceramic adhesion layer. It is therefore the aim of the invention to solve this problem. The problem is solved by a bilayer TBC according to claim 1. In the subclaims further advantages are listed which can be combined arbitrarily with each other to yield further advantages. The figure shows one example of a bilayer TBC. 2023PF12243 2 The figure and the description are only embodiments of the invention. The use of a stabilizer such as Y2O3 and/or Er2O3 and / or Yb2O3 containing YSZ coating shows enhanced manufacturability and thermo-mechanical performance of the TBC sys- tem. This material shows enhanced E-Modulus and coefficient of thermal expansion than the 48YSZ and also 20YSZ. The proposed chemical compositions enhances the melting behavior of the powder parti- cles, improving the manufacture robustness of the coatings which lead to an extended pro- cess window. A higher cohesion of the particles ends up in an improved performance of the coating in all, high and low thermally loaded regions of the coated components. Fur- thermore, an high amount of heavy rare earth (RE) elements leads to a reduction in the thermal conductivity of the top layer of a ceramic coating system. The figure shows a bilayer TBC 15 with a ceramic bottom layer 10 and a ceramic top layer 13. The whole component 1 has a substrate 4 which is preferably a nickel based superalloy. Between the substrate 4 and the bilayer TBC 15 there is metallic bond coat 7 which also improves oxidation resistance, such as NiCoCrAlY-X (X=Ta, Si oder Hf) and especially no Rhenium (Re) or no Ruthenium (Ru). It is proposed the use of following bilayer TBC System 15. For the ceramic bottom layer 10 there are four options: Option BA: P-YSZ, especially 8wt% Y2O3 – ZrO2 Option BB: (2 – 10)wt% Yb2O3 / (2 – 10)wt% Y2O3 / ZrO2 Option BC: (2 – 10)wt% Er2O3 / (2 – 10)wt% Y2O3 / ZrO2 Option BD: (2 – 10)wt% ( Yb2O3 + Er2O3 ) / (2 – 10) wt% Y2O3 / ZrO2. For the ceramic top layer 13 there are three options: Option TA: (2 – 50)wt% (Yb2O3 + Y2O3) / ZrO2 Option TB: (2 – 50)wt% (Er2O3 + Y2O3) / ZrO2 Option TC: (2 – 50)wt% (Yb2O3 + Er2O3 + Y2O3) / ZrO2, 2023PF12243 3 wherein the amount of at least one stabilizer of the ceramic top layer 13 is different by at least 5%, especially by at least 10%, compared to the same of stabilizer of the ceramic bot- tom layer 10 or vice versa, e.g. if the amount of Yb2O3 is 8,0wt% in the ceramic top layer 13, the amount of Yb2O3 is at least 8,4% or maximum 7,6% in the ceramic bottom layer. Preferably the total amount of stabilizers of the ceramic top layer 13 is at least 5%, espe- cially at least 10% higher than the total amount of stabilizers in the ceramic bottom layer 10. Preferably the ceramic top layer 13 is a FSZ. Hafnia HfO2 can also be used as stabilizer in addition to Ytterbia or Erbia, that will mean: It is proposed the use of a following bilayer TBC System 15. For the ceramic bottom layer 10 there are 4 options: Option BA: P-YSZ, especially 8 wt% Y2O3 – ZrO2 Option BB: (2 – 10)wt% Yb2O3 / (2 – 10)wt% Y2O3 / (0.1 – 2)wt% HfO2 / ZrO2 Option BC: (2 – 10)wt% Er2O3 / (2 – 10)wt% Y2O3 / (0.1 – 2)wt% HfO2 / ZrO2 Option BD: (2 – 10)wt% (Yb2O3 + Er2O3) / (2 – 10)wt% Y2O3 / (0.1 – 2)wt% HfO2 / ZrO2 For the ceramic top layer 13 there are 3 options: Option TA: (2 – 50)wt% (Yb2O3 + Y2O3 + HfO2) / ZrO2 Option TB: (2 – 50)wt% (Er2O3 + Y2O3 + HfO2) / ZrO2 Option TC: (2 – 50)wt% (Yb2O3 + Er2O3 + Y2O3 + HfO2) / ZrO2, wherein the amount of at least one stabilizer of the ceramic top layer 13 is different by at least 5%, especially by at least 10%. compared to the same of stabilizer of bottom layer 10 or vice versa. Preferably the total amount of stabilizers of the ceramic top layer 13 is at least 5%, espe- cially at least 10% higher than the total amount of stabilizers in the bottom layer 10. Preferably the ceramic top layer 13 is a FSZ. 2023PF12243 4 Preferably the amount of HfO2 is between 0,2Gew.% to 1,8wt% Hafnia (HfO2), very especially between 0,2Gew.% to 1,6Gew.% Hafnia (HfO2). Alumina Al2O3 can also be used as fracture toughener in addition; that will mean: It is proposed the use of a following bilayer TBC System 15. For the ceramic bottom layer 10 there are four options: Option BA: P-YSZ, especially 8 wt% Y2O3 – ZrO2 Option BB: (2 – 10)wt% Yb2O3 / (2 – 10)wt% Y2O3 / (0.2 – 3)wt% Al2O3 / ZrO2 Option BC: (2 – 10)wt% Er2O3 / 2 – 10) wt% Y2O3 / (0.2 – 3)wt% Al2O3 / ZrO2 Option BD: (2 – 10)wt% (Yb2O3 + Er2O3) / (2 – 10) wt% Y2O3 / (0.2 – 3)wt% Al2O3 / ZrO2 For the ceramic top layer 13 there are also three options: Option TA: (2 – 50)wt% (Yb2O3 + Y2O3 + Al2O3)/ ZrO2 Option TB: (2 – 50)wt% (Er2O3 + Y2O3 + Al2O3) / ZrO2 Option TC: (2 – 50)wt% (Yb2O3 + Er2O3 + Y2O3 + Al2O3 ) / ZrO2, wherein the amount of at least one stabilizer of the ceramic top layer 13 is different by at least 5%, especially by at least 10% compared to the same of stabilizer of the ceramic bot- tom layer 10 or vice versa. Preferably the total amount of stabilizers of the ceramic top layer 13 is at least 5%, espe- cially at least 10%, higher than the total amount of stabilizers in the ceramic bottom layer 10. Preferably the ceramic top layer 13 is a FSZ. Preferably the amount of Al2O3 is between 0,2wt% to 1,5wt% Al2O3, very especially between 0,2wt% to 1,2wt% Al2O3. Another advantage is reached by using Alumina Al2O3 in amount of >1,7wt% bis 3,0wt% Alumina (Al2O3), especially > 2,0wt% bis 2,5wt% Alumina (Al2O3). 2023PF12243 5 The advantages of adding Alumina Al2O3 or Hafnia HfO2 can be combined. For the ceramic bottom layer 10 there are four options: (in wt%): Option BA: P-YSZ, especially 8 wt% Y2O3 – ZrO2 Option BB: (2 – 10)wt% Yb2O3 / (2 – 10)wt% Y2O3 / (0.2% - 3%) Al2O3 + (0.2% - 2wt%) HfO2 / ZrO2 Option BC: (2 – 10)wt% Er2O3 / 2 – 10) wt% Y2O3 / (0.2% - 3%) Al2O3 + (0.2% - 2wt%) HfO2 / ZrO2 Option BD: (2 – 10)wt% (Yb2O3 + Er2O3) / (2 – 10) wt% Y2O3 / (0.2% - 3%) Al2O3 + (0.2% - 2wt%) HfO2 / ZrO2 For the ceramic top layer 13 there are three options. Option TA: (2 – 50)wt% (Yb2O3 + Y2O3 + Al2O3 + HfO2 ) ZrO2 Option TB: (2 – 50)wt% (Er2O3 + Y2O3 + Al2O3 + HfO2 ) ZrO2 Option TC: (2 – 50)wt% (Yb2O3 + Er2O3 + Y2O3 + Al2O3 + HfO2 ) / ZrO2, wherein the amount of at least one stabilizer of the top layer 13 is different by at least 5%, especially by at least 10%, compared to the same of stabilizer of ceramic bottom layer 10 or vice versa, e.g. if the amount of Y2O3 is 6,0wt% in the top layer 13, the amount of Y2O3 is at least 6,3% or maximum 5,7% in the ceramic bottom layer 10. Preferably the total amount of stabilizers of the ceramic top layer 13 is at least 5%, espe- cially at least 10%, higher than the total amount of stabilizers in the ceramic bottom layer 10. Preferably the ceramic top layer is a FSZ. Preferably the bottom layer 10 is partially stabilized Zirconia (PSZ) to adapt the differ- ences in thermal expension. Therefore, possible combinations are possible (just the constituents): for option BB of the ceramic bottom layer 10 and option TA of the top layer 13 Yb2O3 / Y2O3 / Al2O3 / HfO2 / ZrO2 Yb2O3 / Y2O3 / Al2O3 / ZrO2 Yb2O3 / Y2O3 / HfO2 / ZrO2 2023PF12243 6 Yb2O3 / Y2O3 / ZrO2 ; for option BC of the ceramic bottom layer 10 and option TB of the top layer 13 Er2O3 / Y2O3 / ZrO2 Er2O3 / Y2O3 / HfO2 / ZrO2 Er2O3 / Y2O3 / Al2O3 / ZrO2 Er2O3 / Y2O3 / Al2O3 / HfO2 / ZrO2 ; for option BD of the ceramic bottom layer 10 and option TC of the top layer 13 Yb2O3 / Er2O3 / Y2O3 / Al2O3 / ZrO2 Yb2O3 / Er2O3 / Y2O3 / HfO2 / ZrO2 Yb2O3 / Er2O3 / Y2O3 / Al2O3 / HfO2 / ZrO2 Yb2O3 / Er2O3 / Y2O3 / ZrO2. Preferably Zirconia ZrO2 is balancing the compositions of the ceramic layers (10, 13) ex- cept some unavoidable impurities of the examples given above. The ceramic top layer 15 have a preferred thickness of max.1000µm and can preferably be manufactured with Plasma Spraying, HVOF, Physical Vapor Deposition (PVD) tech- nologies or other coating methods. As substrate 4 a nickel or cobalt based superalloy is used for a substate. On top on this metallic substrate a bond coat 7 of NiCoCrAl – X (X=Y, Re, Ta, Si and/or Hf) is preferably applied. Preferably a NiCoCrAlYTa composition is used. Good results were yielded with ^ Ceramic bottom layer 10: Y2O3 / ZrO2 and ceramic top layer 13: Yb2O3 / Y2O3 / Al2O3 / HfO2 / ZrO2 ^ Ceramic bottom layer 10: Yb2O3 / Y2O3 / ZrO2 and ceramic top layer 13: Yb2O3 / Y2O3 / Al2O3 / HfO2 / ZrO2 2023PF12243 7 ^ Ceramic bottom layer10: Yb2O3 / Y2O3 / HfO2 / ZrO2 and ceramic top layer 13: Yb2O3 / Y2O3 / Al2O3 / HfO2 / ZrO2. Favorable examples (EX) (in wt%) of stabilizers (ST) in the ceramic bottom layer 10 are given in following table ST/EX 1 2 3 4 5 6 7 Y2O3 7,7 7,5 5,2 2,2 6,3 8.9 4,2 Yb2O3 2,0 2,0 3,0 - - 1,5 5,5 Er203 - - - 7,7 3,0 8,0 4,0 Hf02 - - 0,3 1,6 1,2 1,4 0,8 Al2O3 - - 2,8 2,3 2,5 1,5 1,2 . Favorable examples (EX) (in wt%) of stabilizes in the ceramic top layer 13 are given in following table ST/EX 1 2 3 4 5 6 7 Y2O3 8,2 8,6 7,7 6,9 9,0 5,7 8,2 Yb2O3 10,2 15,0 20 7,0 17 30 14 Er203 - - - 11 8,3 2,2 21 Hf02 - - 0,5 1,9 1,5 1,7 1.2 Al2O3 - - 3,0 2,8 0,5 1,2 1,8

Claims

2023PF12243 8 Patentansprüche / Patent claims 1. Two layered TBC system (1), comprising a metallic substrate (4), especially comprising a nickel base or cobalt based superalloy, a ceramic bottom layer (10) on the metallic substrate (4), which is made of either PSZ, especially 8 wt% Y2O3 – ZrO2 or (2 – 10)wt% Yb2O3 + (2 – 10)wt% Y2O3 / ZrO2 or (2 – 10)wt% Er2O3 + (2 – 10)wt% Y2O3 / ZrO2 or (2 – 10)wt% (Yb2O3 + Er2O3) + (2 – 10)wt% Y2O3/ ZrO2 and a ceramic top layer (13) on the ceramic bottom layer (13) wherein the ceramic top layer (13) is made of either (2 – 50)wt% (Yb2O3 + Y2O3) / ZrO2 or (2 – 50)wt% (Er2O3 + Y2O3) / ZrO2 or (2 – 50)wt% (Yb2O3 + Er2O3 + Y2O3) / ZrO2. 2. Two layered TBC system according to claim 1, wherein a NiCoCrAlX (X=Y, Ta, Si, Ta, Re) is applied on the metallic substrate (4), especially a NiCoCrAlYTa coating. 3. Two layered TBC system according to claim 1 or 2, wherein in addition to Ytterbia and/or Erbia the ceramic bottom layer (10) or the ceramic top layer (13) 2023PF12243 9 comprises between 0,2Gew.% to 1,8wt% Hafnia (HfO2), especially between 0,2Gew.% to 1,6Gew.% Hafnia (HfO2). 4. Two layered TBC system according to any of the claims 1, 2 or 3, wherein in addition to Ytterbia and/or Erbia the ceramic bottom layer (10) or the ceramic top layer (13) comprises between 0,2wt% to 1,5wt% Al2O3, very especially between 0,2wt% to 1,2wt% Al2O3. 5. Two layered TBC system according to any of the claims 1, 2, 3 or 4, wherein in addition to Ytterbia and/or Erbia the ceramic bottom layer (10) or the ceramic top layer (13) comprises > 1,7wt% bis 3,0wt% Alumina (Al2O3), especially > 2,0wt% bis 2,5wt% Alumina (Al2O3). 6. Two layered TBC system according to any of the claims 1, 2, 3, 4 or 5, wherein the amount of at least one stabilizer of the ceramic top layer (13) is differ- ent by at least 5%, especially different by at least 10%, compared to the same stabilizer of the ceramic bottom layer (10) or vice versa. 7. Two layered TBC system according to any of the claims 1, 2, 3, 4, 5 or 6, wherein the ceramic top layer (15) is a fully stabilized Zirconia (FSZ). 8. Two layered TBC system according to any of the claims 1, 2, 3, 4, 5, 6 or 7, wherein the total amount of stabilizers of the ceramic top layer (13) is at least 5%, especially at least 10% higher, than the total amount of stabilizers in the ceramic bottom layer (10). 9. Two layered TBC system according to any of the claims 1, 2, 3, 4, 5, 6, 7 or 8, wherein the ceramic bottom layer (10) is a partially stabilized Zirconia (PSZ). 2023PF12243 10 10. Two layered TBC system according to any of the claims 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the amount of Zirconia is balancing the composition of the ceramic layers (10, 13) except some unavoidable impurities.
EP24769362.5A 2023-10-30 2024-09-12 Bilayer thermal barrier coating Pending EP4781005A1 (en)

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