Oxidation-resistant coating, method for manufacturing oxidation-resistant coating, combustor components, and combustor

Abstract

The present invention provides an oxidation-resistant coating capable of providing high oxidation resistance to metal components over a wide temperature range, as well as a combustor component and a combustor having the oxidation-resistant coating. [Solution] An oxidation-resistant coating 1 is provided either in direct contact with the surface of a substrate 2 used at temperatures between 200°C and 900°C, or via an intermediate layer 3. The substrate 2 is a metal component containing a first metal. The oxidation-resistant coating 1 is a metal film containing a second metal different from the first metal. At the above temperatures, the standard Gibbs free energy of formation of the oxide of the second metal is higher than the standard Gibbs free energy of formation of the oxide of the first metal.

Description

Technical Field

[0001] Embodiments of the present invention relate to an oxidation-resistant coating, a method for manufacturing the oxidation-resistant coating, a combustor part, and a combustor.

Background Art

[0002] Towards achieving carbon neutrality, the development of devices such as combustors, burners, and turbines using hydrogen fuel is underway. Since the combustion of hydrogen fuel reaches a high temperature of, for example, 3000°C or higher, as a material for members exposed to the combustion environment, it is a candidate to use a metal with high thermal conductivity while cooling it. Specifically, copper or a copper alloy, etc. are candidates for the above metal.

[0003] The metal exposed to the combustion environment is preferably cooled sufficiently in consideration of the temperature at which creep deformation or softening occurs. If it is a copper alloy, it is cooled to a temperature of, for example, higher than 200°C and lower than or equal to 500°C. However, at a temperature higher than 200°C and lower than or equal to 500°C, oxidation of the metal is a concern.

[0004] On the other hand, in order to impart oxidation resistance to the metal, it is useful to apply an oxidation-resistant coating to the surface of the metal. Conventional oxidation-resistant coatings can be formed using surface treatment methods such as aluminum (Al) pack or chromium (Cr) pack. Metal members of devices such as gas turbines and jet engines used in a high-temperature environment can obtain oxidation resistance by forming an Al coating or a Cr coating on the surface using an Al pack or a Cr pack. When these coatings are exposed to an environment containing an oxidizing atmosphere at a high temperature exceeding 900°C, a stable protective oxide film such as aluminum oxide (alumina) is formed on the surface to prevent oxidation of the metal member.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] As mentioned above, conventional oxidation-resistant coatings form a stable protective oxide film when exposed to environments containing an oxidizing atmosphere at temperatures exceeding 900°C (high-temperature environments), thereby suppressing oxidation of metal components. However, for example, metal components used while being cooled to temperatures between 200°C and 900°C in the vicinity of a high-temperature environment cannot form the above protective oxide film on their surface, making it difficult to suppress oxidation.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide an oxidation-resistant coating that can impart high oxidation resistance to metal members over a wide temperature range, as well as a combustor component and a combustor having said oxidation-resistant coating. [Means for solving the problem]

[0008] One embodiment is an oxidation-resistant coating provided in direct contact with the surface of a substrate used at temperatures greater than 200°C but less than 800°C. The substrate is a metal component containing a first metal. The oxidation-resistant coating is a metal film containing a second metal different from the first metal. At the above temperatures, the standard Gibbs free energy of formation of the oxide of the second metal is higher than the standard Gibbs free energy of formation of the oxide of the first metal.

[0009] Another embodiment is an oxidation-resistant coating provided on the surface of a substrate used at temperatures between 200°C and 900°C, with an intermediate layer in between. The substrate is a metal component containing a first metal. The oxidation-resistant coating is a metal film containing a second metal different from the first metal. At the above temperatures, the standard Gibbs free energy of formation of the oxide of the second metal is higher than the standard Gibbs free energy of formation of the oxide of the first metal. [Effects of the Invention]

[0010] According to the present invention, high oxidation resistance can be imparted to metal components over a wide temperature range. [Brief explanation of the drawing]

[0011] [Figure 1] This is a schematic diagram showing the first structural example of an oxidation-resistant coating. [Figure 2] This is an Ellingham diagram showing the standard formation energies of metal oxides. [Figure 3] This is a schematic diagram illustrating an example of a manufacturing method for oxidation-resistant coatings. [Figure 4] This is a schematic diagram showing a second structural example of an oxidation-resistant coating. [Figure 5] This is a schematic diagram showing a third structural example of an oxidation-resistant coating. [Figure 6] This is a schematic diagram showing an example of the structure of a combustor with an oxidation-resistant coating. [Modes for carrying out the invention]

[0012] The embodiments will be described below with reference to the drawings. In each of the embodiments shown below, substantially identical components are denoted by the same reference numerals, and their descriptions may be partially omitted. The drawings are schematic, and the relationship between thickness and planar dimensions, the ratio of the thickness of each part, etc., may differ from those in reality.

[0013] (First structural example of an oxidation-resistant coating) Figure 1 is a schematic diagram showing a first structural example of an oxidation-resistant coating. Figure 1 shows article 10, which comprises a coating 1 and a substrate 2. An example of article 10 is a combustor component used in an oxidizing atmosphere exceeding 2000°C.

[0014] Coating 1 is an oxidation-resistant coating that imparts oxidation resistance to the substrate 2. Coating 1 is provided on the surface of the substrate 2. FIG. 1 shows an example where Coating 1 is provided in direct contact with the surface of the substrate 2, but it is not limited thereto, and Coating 1 may be provided via at least one layer on the surface of the substrate 2. Coating 1 may cover the surface of the substrate 2.

[0015] The substrate 2 is, for example, used at a temperature above 200 °C, further above 300 °C, and below 900 °C, further below 800 °C, for example, 600 °C or below. The substrate 2 is, for example, used in an oxidizing atmosphere. The oxidizing atmosphere is, for example, an atmosphere containing oxygen. When the oxidizing atmosphere exceeds 900 °C, the substrate 2 may be used at the above temperature while being cooled.

[0016] The substrate 2 is a metal member containing a first metal. The first metal is not particularly limited, but is preferably, for example, copper (Cu) or a copper alloy. The substrate 2 is preferably a metal member formed from copper or a copper alloy having high thermal conductivity and excellent availability. The metal member may contain at least one metal element selected from chromium (Cr) and zirconium (Zr). The metal member is preferably, for example, chromium zirconium copper. The metal member may contain unavoidable impurities. The thickness of the substrate 2 is, for example, 1 μm or more and 100 μm or less, preferably 3 μm or more and 50 μm or less.

[0017] At temperatures below 900 °C, as described above, a protective oxide film cannot be formed, and it is difficult to suppress the oxidation of the metal member. Further, at temperatures below 200 °C, the surface of the metal member does not oxidize in the first place even when exposed to an oxidizing atmosphere, so an oxidation-resistant coating is not necessary.

[0018] In contrast, the oxidation-resistant coating of the embodiment can impart high oxidation resistance in a temperature range exceeding 200°C and not exceeding 900°C. Coating 1 is a metal film containing a second metal that is different from the first metal and is more thermodynamically stable than the first metal. The fact that the second metal is more thermodynamically stable than the first metal means that at the temperature of the substrate 2, the standard Gibbs energy of formation (second standard Gibbs energy of formation) of the oxide of the second metal is higher than the standard Gibbs energy of formation (first standard Gibbs energy of formation) of the oxide of the first metal. The surface of Coating 1 may be exposed so as to be, for example, exposed to an oxidizing atmosphere.

[0019] The second metal is, for example, silver (Ag), platinum (Pt), or gold (Au). The metal film may be formed from a metal or alloy containing at least one metal element selected from the group consisting of silver, platinum, and gold. The metal film may contain inevitable impurities. It is preferable that the metal film is not an oxide film. Also, it is preferable that no oxide film is formed on the exposed surface of the metal film. [[ID=;5]]<;

[0020] FIG. 2 is an Ellingham diagram showing the standard formation energy of metal oxides, and shows the change in the standard Gibbs energy of formation per mole of oxygen ΔG 0 (kJmol -1 ) and the relationship with the ambient temperature (K) of the reaction. FIG. 2 shows a thick line 11, a dashed-dotted line 12, and a broken line 13. The thick line 11 shows the change in the standard Gibbs energy of formation of silver oxide (Ag2O). The dashed-dotted line 12 shows the change in the standard Gibbs energy of formation of copper(II) oxide (CuO). The broken line 13 shows the change in the standard Gibbs energy of formation of copper(I) oxide (Cu2O). The formation reactions of Ag2O, CuO, and Cu2O are represented by the following chemical reaction formulas (1) to (3), respectively. 4Ag + O2 → 2Ag2O (1) 2Cu + O2 → 2CuO (2) 4Cu + O2 → 2Cu2O (3)

[0021] Comparing the standard Gibbs free energy of formation of copper oxide (a first metal) and silver oxide (a second metal) at temperatures between 200°C and 900°C, for example, it can be seen that silver oxide is less likely to form than copper oxide and is thermodynamically more stable. Thus, by using a second metal in coating 1 whose oxide standard Gibbs free energy is higher than that of the first metal oxide within the operating temperature range of article 10, an oxidation-resistant coating can be provided that offers high oxidation resistance over a wide temperature range.

[0022] The thickness of coating 1 is, for example, 1 μm to 100 μm, preferably 3 μm to 50 μm. Coating 1 may be thinner than the substrate 2. By making the thickness of coating 1 3 μm to 50 μm, coating peeling during deformation due to internal pressure, system stress, and thermal stress can be suppressed, and the thermal gradient between the substrate 2 and coating 1 can be suppressed.

[0023] Coating 1 and substrate 2 may undergo thermal expansion in high-temperature environments such as the oxidizing atmosphere described above. If the difference in thermal expansion between coating 1 and substrate 2 is large, there is a concern that coating 1 may peel off from substrate 2. Therefore, it is preferable that coating 1 and substrate 2 be composed of materials with similar coefficients of linear expansion within the operating temperature range of article 10. For example, within the operating temperature range of article 10 (e.g., a temperature range of over 200°C and up to 900°C), it is preferable that the coefficient of linear expansion of coating 1 (first coefficient of linear expansion) is 0.7 to 1.5 times, more preferably 0.8 to 1.2 times, and more preferably 0.9 to 1.1 times, the coefficient of linear expansion of substrate 2 (second coefficient of linear expansion).

[0024] Article 10 may have a mixed region between the coating 1 and the substrate 2 that includes the metal elements constituting the coating 1 and the metal elements constituting the substrate 2. The mixed region may be formed by the diffusion of the metal elements constituting the substrate 2 into the coating 1 or by the diffusion of the metal elements constituting the coating 1 into the substrate 2.

[0025] (Example of a method for manufacturing an oxidation-resistant coating) Coating 1 can be formed by forming a metal film on the surface of an object such as a substrate 2 using surface treatment methods such as electroless plating, thermal spraying, cold spraying, vapor deposition, or cladding. Figure 3 is a schematic diagram illustrating an example of a method for manufacturing an oxidation-resistant coating. Here, as an example, we will describe an example in which coating 1 is formed by forming a silver film on the surface of a copper substrate 2 using electroplating.

[0026] First, as a pretreatment step, oil and dirt are removed from the surface of the object (in this case, the surface of the copper component) using an alkaline degreasing solution or organic solvent. Pretreatment can be performed using acid cleaning or water washing. Next, in the plating process, a silver cyanide bath is used, with the copper component as the cathode and pure silver as the anode, connected to the DC power supply unit 24. The current density is 0.5~2.5A / dm². 2 By applying the process at a temperature of 20-35°C for 30-60 minutes, a silver film with a thickness of several tens of micrometers can be formed.

[0027] Plating is performed after masking is applied to areas other than the surface to be plated. As shown in Figure 3, if the base material 2 is a metal cylinder 21 and the surface to be coated 1 (the surface to be plated) is the inner circumferential surface of the metal cylinder 21, the plating process may be carried out by placing the plating solution 22 and electrodes 23 inside the hollow of the metal cylinder 21.

[0028] The electroplating solution may be a thiosulfate bath with silver thiosulfate and sodium sulfate, an amine bath with silver ammine complex, sodium sulfate and copper sulfate, a cyanide-free chloride bath with silver chloride and hydrochloric acid, or a sulfuric acid bath with silver sulfate and sulfuric acid, and is not particularly limited.

[0029] The formation conditions for coating 1, such as current density, temperature, and time, can be adjusted as appropriate to change the thickness and density of coating 1, and the above method is just one example. After the plating process, the plating solution is removed by washing with water. The above is a description of an example of a method for manufacturing an oxidation-resistant coating.

[0030] (Second structural example of oxidation-resistant coating) Figure 4 is a schematic diagram showing a second structural example of an oxidation-resistant coating. Figure 4 shows article 10. Article 10 comprises a coating 1, a substrate 2, and an intermediate layer 3.

[0031] The intermediate layer 3 is provided between the coating 1 and the substrate 2. The intermediate layer 3 is provided to prevent the coating 1 and the substrate 2 from delaminating due to the difference in thermal expansion within the operating temperature range of the article 10.

[0032] If the coefficients of linear expansion differ between the coating 1 and the substrate 2 within the operating temperature range of article 10, it is preferable that the coefficient of linear expansion of the intermediate layer 3 (third coefficient of linear expansion) within the operating temperature range of article 10 is a value between the coefficient of linear expansion of the coating 1 and the coefficient of linear expansion of the substrate 2. The intermediate layer 3 can effectively buffer the deformation differences of each layer due to thermal expansion. The intermediate layer 3 contains, for example, nickel. It is preferable that the intermediate layer 3 is a metal film made of, for example, a metal or alloy containing nickel. Further descriptions of article 10, coating 1 and substrate 2 can be appropriately referenced from the description of the first structural example of the oxidation-resistant coating.

[0033] As described above, in the second structural example, by forming an intermediate layer 3 between the coating 1 and the substrate 2, peeling of the coating 1 from the substrate 2 can be suppressed.

[0034] (Third structural example of oxidation-resistant coating) Figure 5 is a schematic diagram showing a third structural example of an oxidation-resistant coating. Figure 5 shows article 10. Article 10 has a coating 1, a substrate 2, and an uneven interface 5.

[0035] The uneven interface 5 is provided between the coating 1 and the substrate 2. Figure 5 shows an example in which the uneven interface 5 is formed at the interface between the coating 1 and the substrate 2, but is not limited to this, and the uneven interface 5 may be formed between the substrate 2 and the intermediate layer 3, or between the coating 1 and the intermediate layer 3. Furthermore, the uneven interface 5 may be formed between the substrate 2 and the intermediate layer 3, and between the coating 1 and the intermediate layer 3, respectively.

[0036] The uneven interface 5 can be formed, for example, by processing the surface of the substrate 2 or the surface of the intermediate layer 3 before forming the coating 1. Surface processing can be carried out, for example, by blasting or peening. Further descriptions of the article 10, coating 1 and substrate 2 can be appropriately referenced from the description of the first structural example of the oxidation-resistant coating.

[0037] As described above, in the third structural example, by forming an uneven interface 5 between the coating 1 and the substrate 2, the contact area between the coating 1 and the substrate 2, the contact area between the coating 1 and the intermediate layer 3, and the contact area between the substrate 2 and the intermediate layer 3 can be increased compared to the case without the uneven interface 5. Furthermore, by forming an uneven interface 5 at the interface between the coating 1 and the substrate 2, the force required to peel off the coating 1 does not propagate linearly to the surface of the substrate 2, but rather the energy is dispersed, thereby improving the adhesion between the coating 1 and the substrate 2. Therefore, peeling of the coating 1 and the intermediate layer 3 from the substrate 2 can be effectively suppressed.

[0038] (Example of a combustor structure using an oxidation-resistant coating) Figure 6 is a schematic diagram showing an example of the structure of a combustor with an oxidation-resistant coating. Figure 6 shows a combustor 30. The combustor 30 is installed, for example, upstream of a turbine.

[0039] The combustor 30 includes an oxidation-resistant coating 31, a combustor inner cylinder 32, a combustor outer cylinder 33 provided around the combustor inner cylinder 32, a cooling passage 34 formed between the combustor inner cylinder 32 and the combustor outer cylinder 33, a gas inlet IN, and a gas outlet OUT. The oxidation-resistant coating 31 corresponds to the combustion coating 1 and is provided, for example, on the inner surface of the combustor inner cylinder 32. The combustor inner cylinder 32 is one of the combustor components and corresponds to the base material 2. Therefore, the descriptions of coating 1 and base material 2 in the first to third structural examples above can be appropriately applied to the descriptions of the oxidation-resistant coating 31 and the combustor inner cylinder 32.

[0040] The combustor 30 mixes hydrogen gas and oxygen gas supplied from the gas inlet IN and burns them inside the combustor inner cylinder 32 to generate high-temperature, high-pressure water vapor, which is discharged from the gas outlet OUT. Hydrogen gas can be supplied, for example, from a hydrogen supply channel 35 connected to the gas inlet IN via the gas inlet IN. Oxygen gas can be supplied, for example, from an oxygen supply channel 36 connected to the gas inlet IN via the gas inlet IN via the gas inlet IN. Water vapor can be discharged to the water vapor discharge channel 37 via the gas outlet OUT.

[0041] Combustion creates an oxidizing atmosphere inside the combustor inner cylinder 32. The temperature of the flame 38 due to combustion is about 3000°C, but the combustor inner cylinder 32, which is a metal component exposed to the combustion environment, is cooled to the combustor inner cylinder 32's durable temperature range. The durable temperature is determined based on the temperature at which creep deformation or softening occurs in the material. For example, if the durable temperature of copper is, for example, 500°C, then the copper component during operation is used in a temperature range of over 200°C and up to 500°C. It is preferable that the combustor inner cylinder 32 be cooled to a temperature of, for example, over 200°C and up to 900°C, and even further, over 300°C and below 800°C, for example, up to 600°C, in the presence of an oxidizing atmosphere of 3000°C or higher.

[0042] For metal components exposed to the combustion environment to be sufficiently cooled to their durable temperature, it is preferable to cool the metal components from the outside to their durable temperature using a cooling fluid, which is a liquid or gas, flowing through the cooling passage 34, and for the metal components to have high thermal conductivity. If the thermal conductivity is low, a large thermal gradient will occur between the surface exposed to the combustion environment and the cooling surface. Therefore, it is preferable that the thermal conductivity of the combustor inner cylinder 32 is greater than or equal to the thermal conductivity of the oxidation-resistant coating 31, and more preferably higher than the oxidation-resistant coating 31. For example, it is preferable that the metal components used in the article 10 and the combustor inner cylinder 32 have a thermal conductivity of 200 W / m·K or more at 25°C. By forming the oxidation-resistant coating 31 using a metal with high thermal conductivity, the cooling passage 34 can uniformly cool the surface of the oxidation-resistant coating 31 to its exposed surface.

[0043] As described above, the oxidation-resistant coating of the embodiment can be applied to a combustor. However, the application of the oxidation-resistant coating is not limited to the combustor. Furthermore, the first to third structural examples of the oxidation-resistant coating can be applied to the oxidation-resistant coating 31 of the combustor shown in Figure 6. [Examples]

[0044] To demonstrate that the oxidation-resistant coating of the embodiment possesses excellent oxidation resistance, a high-temperature oxidation test was conducted. The test involved preparing multiple samples in which the coating was formed using silver and the substrate was formed using chromium-zirconium copper or oxygen-free copper. Some samples had a nickel layer formed as an intermediate layer between the coating and the substrate. Additionally, some samples were prepared by forming a chromium coating or an aluminum coating instead of a silver coating.

[0045] The silver coating was formed using the electroplating method described above. The intermediate nickel layer was formed using a watt bath with a current density of 2-5 A / dm². 2 The material was formed by electroplating at a temperature of 50-60°C for approximately 30 minutes to 1 hour.

[0046] The chrome and aluminum coatings were formed by plating or diffusion penetration treatment.

[0047] High-temperature oxidation tests were performed using 20 × 10 × 3 mm strip-shaped test specimens made of oxygen-free copper or chromium zirconium copper as the substrate. Twelve strip-shaped test specimens (sample members 1 to 12) were prepared to conduct high-temperature oxidation tests under each condition. The materials, coating materials, and intermediate layer materials constituting each sample member are shown in Table 1. The oxidation temperature is also shown. Sample members 1 to 6 are examples, and 7 to 12 are comparative examples.

[0048] The samples were subjected to an oxidation test at 600°C or 800°C for 100 hours in an atmospheric environment (oxygen concentration of approximately 20%). After the test, the cross-section of the sample was observed under an optical microscope at 200x magnification. If a new layer, such as scale, with a thickness of 20 μm or more was formed between the substrate, coating, or intermediate layer, oxidation was determined. The results are shown in the "Presence or Absence of Oxidation" column of Table 1.

[0049] For samples in which oxidation was not observed, the cross-section of the sample was observed under an optical microscope at 200x magnification. If a gap was observed between the substrate and the coating, it was determined that delamination had occurred. The results are shown in the "Coating Delamination" column of Table 1.

[0050] Sample members that did not oxidize and whose coating was "not peeling" or "partially peeled" were judged as passing, while oxidized sample members or those whose coating was "peeled" were judged as failing. The results are shown in the "Pass / Fail" column of Table 1. ○ indicates passing, and × indicates failing. "Partial peeling" refers to a state in which there is a gap only in a part of the observed cross-section between the substrate and the coating. "Peeling" refers to a state in which the gap extends throughout the entire area between the substrate and the coating in the observed cross-section.

[0051] Sample members 1 and 7 allow for a comparison of the effects of the presence or absence of silver coating, and it can be concluded that the silver coating prevented oxidation and provided oxidation resistance to the chromium zirconium copper substrate.

[0052] Sample members 1, 8, and 9 allow for a comparison of the effects of a silver coating, which is thermodynamically more stable than the substrate, and a chromium or aluminum coating, which are thermodynamically less stable. It can be concluded that the thermodynamically stable metal coatings imparted oxidation resistance to the substrate.

[0053] Furthermore, by comparing the effects of the presence or absence of an intermediate layer in sample members 1 and 2, it can be determined that forming an intermediate layer between the substrate and the coating prevented the peeling of the coating.

[0054] The effects of silver coating on sample members 4 and 11 can be compared, and it can be concluded that the silver coating prevented oxidation and provided oxidation resistance to the oxygen-free copper substrate.

[0055] Furthermore, by comparing the effects of the presence or absence of an intermediate layer in sample members 4 and 5, it can be determined that coating peeling could be prevented by providing nickel, which has excellent adhesion between the oxygen-free copper substrate and the silver coating material, as an intermediate layer.

[0056] Sample members 3 and 10 allow for a comparison of the effects of the presence or absence of an intermediate layer on a chromium zirconium copper substrate, particularly at a high temperature of 800°C. Similarly, sample members 6 and 12 allow for a comparison of the effects of the presence or absence of an intermediate layer on an oxygen-free copper substrate. In oxidation tests of chromium zirconium copper or oxygen-free copper at 800°C, the coating peeled off in sample members 10 and 12, which lacked an intermediate layer. This is thought to be due to a large difference in thermal expansion between the substrate and the coating at high temperatures. On the other hand, no peeling of the coating was observed in sample members 3 and 6, which had an intermediate layer. Therefore, it is preferable to provide an intermediate layer when forming a coating in a high-temperature environment where peeling due to differences in thermal expansion is a concern.

[0057] [Table 1]

[0058] Although several embodiments of the present invention have been described above, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0059] 1...Coating, 2...Substrate, 5...Uneven interface, 10...Article, 11...Thick line, 12...Dotted line, 13...Broken line, 21...Metal cylinder, 22...Plating solution, 23...Electrode, 24...DC power supply, 30...Combustor, 31...Oxidation-resistant coating, 32...Inner cylinder of combustor, 33...Outer cylinder of combustor, 34...Cooling passage, 35...Hydrogen supply passage, 36...Oxygen supply passage, 37...Water vapor exhaust passage, 38...Flame, IN...Gas inlet, OUT...Gas outlet.

Claims

1. An oxidation-resistant coating applied in direct contact with the surface of a substrate used at temperatures exceeding 200°C but less than 800°C, The substrate is a metal member containing a first metal, The oxidation-resistant coating is a metal film containing a second metal different from the first metal, At the aforementioned temperature, the standard Gibbs free energy of formation of the oxide of the second metal is higher than the standard Gibbs free energy of formation of the oxide of the first metal. Oxidation-resistant coating.

2. An oxidation-resistant coating provided on the surface of a substrate used at temperatures exceeding 200°C and below 900°C, via an intermediate layer, The substrate is a metal member containing a first metal, The oxidation-resistant coating is a metal film containing a second metal different from the first metal, At the aforementioned temperature, the standard Gibbs free energy of formation of the oxide of the second metal is higher than the standard Gibbs free energy of formation of the oxide of the first metal. Oxidation-resistant coating.

3. The aforementioned metal member has a thermal conductivity of 200 W / m·K or more at 25°C. The oxidation-resistant coating according to claim 1 or claim 2.

4. The first metal is copper or a copper alloy. The oxidation-resistant coating according to claim 1 or claim 2.

5. The second metal is a metal or alloy containing at least one metallic element selected from the group consisting of silver, platinum, and gold. The oxidation-resistant coating according to claim 1 or claim 2.

6. The aforementioned metal member is made of copper or a copper alloy. The aforementioned metal film is made of a metal or alloy containing at least one metallic element selected from the group consisting of silver, platinum, and gold. The oxidation-resistant coating according to claim 1 or claim 2.

7. The aforementioned intermediate layer contains nickel, The oxidation-resistant coating according to claim 2.

8. The substrate has an uneven interface between it and the oxidation-resistant coating. The oxidation-resistant coating according to claim 1.

9. An uneven interface is provided between the intermediate layer and the oxidation-resistant coating or between the intermediate layer and the substrate. The oxidation-resistant coating according to claim 2.

10. The aforementioned substrate is used in an oxidizing atmosphere. If the oxidizing atmosphere exceeds 900°C, the substrate is used at the temperature while being cooled. The oxidation-resistant coating according to claim 1 or claim 2.

11. A method for producing an oxidation-resistant coating according to claim 1 or claim 2, The oxidation-resistant coating is formed by forming the metal film using plating, thermal spraying, cold spraying, cladding, or vapor deposition. A method for manufacturing oxidation-resistant coatings.

12. The oxidation-resistant coating according to claim 1 or claim 2, The aforementioned substrate, A combustion chamber component that is equipped with the following.

13. The oxidation-resistant coating according to claim 1 or claim 2, The aforementioned substrate, A combustion device equipped with the following:

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