Thermal barrier coating ceramic material, method for producing the same and thermal barrier coating

Abstract

The present application relates to a kind of thermal barrier coating ceramic materials and its preparation method and thermal barrier coating.The thermal barrier coating ceramic material includes composite material, the composite material is the composite of lanthanum strontium manganate and yttria stabilized zirconia;Ce element is doped in the lanthanum strontium manganate. 3+ / Ce 4+ Ion, and lanthanum strontium manganate is formed into composite material with yttria stabilized zirconia, the electronic structure and optical performance of thermal barrier coating ceramic material under high temperature are optimized, its infrared radiation ability in 3 μm~5 μm in mid-infrared wave band under 700 DEG C is inhibited, thereby solving the problem that the substrate is overheated and lost due to high temperature infrared radiation heat transfer of traditional thermal barrier coating.

Description

Technical Field

[0001] This application belongs to the field of functional materials technology, specifically relating to a thermal barrier coated ceramic material, its preparation method, and the thermal barrier coating. Background Technology

[0002] Currently, to address the challenges of next-generation ultra-high thrust-to-weight ratio aero-engines and other related equipment operating in extreme high-temperature environments, a series of low-emissivity thermal barrier coating materials have been developed. When radiative heat transfer replaces convection as the primary heat transfer method, traditional high-emissivity coatings strongly absorb heat from the combustion gases and transfer it internally, leading to excessive metal substrate temperatures and overburdening the cooling system. Low-emissivity coatings, acting like a mirror, efficiently reflect rather than absorb radiant heat, reducing heat inflow and thus lowering substrate temperature and cooling air consumption to improve engine efficiency. Simultaneously, by reducing the coating surface temperature, they delay thermomechanical damage and extend coating life. This benefits engines by enabling higher operating temperatures and higher efficiency.

[0003] La 1-x Sr x MnO3 not only has low thermal conductivity, but also good high-temperature oxidation resistance, La 1-x Sr x MnO3 remains stable in complex atmospheres up to 1200℃, thus attracting widespread attention in high-temperature functional coatings. Currently, the most widely used material in the field of thermal barrier coatings is 8wt% yttrium-stabilized zirconium oxide (YSZ), which has become the industry's first choice due to its comprehensive advantages such as low thermal conductivity, high coefficient of thermal expansion, and high toughness. To further break through its performance limits, introducing a second phase to form a composite system has become an important research direction. Given the advantages of lanthanum-strontium manganate, its combination with yttrium-stabilized zirconium oxide is considered a highly promising strengthening pathway. CN103693956A discloses a YSZ-LSM composite thermal barrier coating material and its preparation method, which reduces the thermal conductivity of the thermal barrier coating material and improves its anti-sintering performance, but the composite thermal barrier coating has a high infrared emissivity.

[0004] In the process of rare-earth doping modification of thermal barrier coatings, the change in infrared emissivity mainly depends on the point defects introduced by the rare-earth doping elements and their unique electronic transition mechanisms. For example, Y... 3+ The oxygen vacancy scattering mechanism, Er 3+ The doping of these elements, such as the ff transition to enhance radiation, is mostly aimed at improving the emissivity of the material. However, there is still a lack of systematic research on the technical defects of thermal barrier coatings in high-temperature environments, such as overheating of the substrate and increased cooling load due to infrared radiation heat transfer.

[0005] Therefore, how to overcome the technical defects of existing thermal barrier coatings that cause substrate overheating and increased cooling load due to infrared radiation heat transfer in high-temperature environments has become an urgent problem to be solved. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides a thermal barrier coated ceramic material, its preparation method, and the thermal barrier coating, by introducing Ce at the La sites of lanthanum strontium manganate. 3+ / Ce 4+ Ions were used to form a composite material with lanthanum strontium manganate and yttrium-stabilized zirconium oxide, which optimized the electronic structure and optical properties of thermal barrier coating ceramic materials at high temperatures, reduced the surface temperature of the coating, delayed thermomechanical damage, and extended the coating life.

[0007] To achieve this objective, the following technical solution is adopted in this application: In a first aspect, this application provides a thermal barrier coating ceramic material, the thermal barrier coating ceramic material comprising a composite material, the composite material being a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The lanthanum-strontium manganate is doped with Ce.

[0008] This application introduces Ce at the La site of lanthanum-strontium manganate. 3+ / Ce 4+ By utilizing the variable valence characteristics and charge transfer absorption mechanism of Ce ions, the electronic structure and optical properties of thermal barrier coated ceramic materials at high temperatures are optimized, thereby suppressing the infrared radiation capability of thermal barrier coated ceramic materials in the 3μm~5μm mid-infrared band at 700℃.

[0009] In some embodiments, the chemical formula of the lanthanum-strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, where x is 0.1 to 0.7, for example, it can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6 or 0.7, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0010] In some embodiments, the mass percentage of lanthanum strontium manganate in the composite material is 1% to 90%, for example, it can be 1%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% or 90%, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable, preferably 10% to 20%.

[0011] In some embodiments, the yttrium oxide stabilized zirconium oxide contains 6% to 9% by mass, for example, 6%, 7%, 8% or 9%, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0012] Secondly, this application provides a method for preparing a thermal barrier coating ceramic material as described in the first aspect, wherein the preparation method is a solid-state synthesis method, and the solid-state synthesis method includes the following steps: (1) Weigh La2O3, SrCO3, MnO2, CeO2, Y2O3 and ZrO2 according to the stoichiometric ratio, mix the weighed raw materials with anhydrous ethanol, and then ball mill them together; (2) The slurry obtained after ball milling in step (1) is dried and sieved to obtain a mixed powder; (3) Press the mixed powder obtained in step (2) into a green body, and then perform cold isostatic pressing on the green body; (4) The green body obtained by cold isostatic pressing in step (3) is pre-sintered, cooled in the furnace after pre-sintering, and then ball-milled, dried and sieved to obtain the thermal barrier coating ceramic material.

[0013] In some embodiments, the mass ratio of material to balls in the ball milling mixture in step (1) is 1:2 to 1:5, for example, it can be 1:2, 1:3, 1:4 or 1:5, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0014] In some embodiments, the ball milling mixing speed is 400 rpm to 500 rpm, for example, 400 rpm, 450 rpm or 500 rpm, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0015] In some embodiments, the ball milling mixing time is 6h to 24h, for example, it can be 6h, 8h, 10h, 12h, 14h, 16h, 18h, 20h, 22h or 24h, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0016] In some embodiments, the pressure for pressing into a green blank in step (3) is 5MPa to 10MPa, for example, it can be 5MPa, 6MPa, 7MPa, 8MPa, 9MPa or 10MPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0017] In some embodiments, the pressure of the cold isostatic pressing is 200MPa to 250MPa, for example, it can be 200MPa, 210MPa, 220MPa, 230MPa, 240MPa or 250MPa, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0018] In some embodiments, the tablet press for pressing the green compact is a single-axis tablet press.

[0019] In some embodiments, the pre-sintering in step (4) includes a first stage of heating and a second stage of heating performed sequentially; The heating rate of the first stage is 5℃ / min~7℃ / min, and the final temperature is 1000℃~1100℃; The heating rate of the second stage is 2℃ / min to 4℃ / min, the final temperature is 1200℃ to 1300℃, and the holding time is 10h to 12h.

[0020] The heating rate of the first stage is 5℃ / min to 7℃ / min, for example, it can be 5℃ / min, 6℃ / min or 7℃ / min, but it is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0021] The final temperature of the first heating stage is 1000℃~1100℃, for example, it can be 1000℃, 1010℃, 1020℃, 1030℃, 1040℃, 1050℃, 1060℃, 1070℃, 1080℃, 1090℃ or 1100℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0022] The heating rate for the second stage is 2℃ / min to 4℃ / min, for example, it can be 2℃ / min, 3℃ / min or 4℃ / min, but it is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0023] The final temperature of the second heating stage is 1200℃~1300℃, for example, it can be 1200℃, 1210℃, 1220℃, 1230℃, 1240℃, 1250℃, 1260℃, 1270℃, 1280℃, 1290℃ or 1300℃, but is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0024] The holding time after reaching the final temperature in the second stage of heating is 10h~12h, for example, it can be 10h, 11h or 12h, but it is not limited to the listed values. Other unlisted values ​​within the range are also applicable.

[0025] In some embodiments, the pre-sintering is carried out in an oxygen-containing atmosphere, the gas used in the oxygen-containing atmosphere including air.

[0026] Thirdly, this application provides a thermal barrier coating, which includes the thermal barrier coating ceramic material described in the first aspect, or the thermal barrier coating ceramic material prepared by the preparation method described in the second aspect.

[0027] Fourthly, this application also provides the application of the thermal barrier coating described in the third aspect in the thermal protection of high-temperature components of aero-engines or gas turbines.

[0028] Compared with the prior art, this application has at least the following beneficial effects: (1) This application introduces Ce at the La site of lanthanum strontium manganate. 3+ / Ce 4+ By utilizing the variable valence characteristics and charge transfer absorption mechanism of Ce ions, the electronic structure and optical properties of thermal barrier coated ceramic materials at high temperatures are optimized, thereby suppressing the infrared radiation capability of thermal barrier coated ceramic materials in the 3μm~5μm mid-infrared band at 700℃.

[0029] (2) The thermal barrier coating ceramic material provided in this application has a stable structure under high temperature conditions. After 100 thermal cycles below 1200℃, there is no phase change or cracking. It has a longer thermal cycle life than the traditional yttrium-stabilized zirconia coating and is well compatible with existing thermal spraying processes, thus providing a more efficient thermal protection and thermal management solution for high-temperature components such as aero engines and gas turbines. Detailed Implementation

[0030] The technical solution of this application will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely to help understand this application and should not be regarded as specific limitations on this application.

[0031] The "range" disclosed in this application can be defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints. Any endpoint can be independently included or excluded, and they can be combined arbitrarily; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60~120 and 80~110 are listed for a specific parameter, it is expected that ranges of 60~110 and 80~120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are also listed, then the following ranges are all expected: 1~3, 1~4, 1~5, 2~3, 2~4, and 2~5. In this application, unless otherwise stated, the numerical range "a~b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0" and "5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer ≥2, it is equivalent to listing integers such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. For instance, when a parameter is described as an integer selected from "2~10", it is equivalent to listing the integers 2, 3, 4, 5, 6, 7, 8, 9, and 10.

[0032] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0033] The term "embodiment" as used in this application means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment or implementation of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0034] Those skilled in the art will understand that the order in which the steps are written in the methods of the various embodiments does not imply a strict execution order. The detailed execution order of each step should be determined by its function and possible internal logic. Unless otherwise specified, all steps of this application may be performed sequentially or randomly, but are preferably performed sequentially. For example, if the method includes steps (a) and (b), it means that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), meaning that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0035] In this application, open-ended technical features or solutions described with terms such as "comprising" do not exclude additional members beyond those listed unless otherwise specified. They can be considered as providing both closed-ended features or solutions comprised of the listed members and open-ended features or solutions that include additional members beyond the listed members. For example, if A includes a1, a2, and a3, it may also include other members or exclude additional members unless otherwise specified. This can be considered as providing both technical features or solutions where "A consists of a1, a2, and a3" or "A is selected from a1, a2, and a3," and technical features or solutions where "A includes not only a1, a2, and a3, but also other members."

[0036] In this application, unless otherwise specified, the features or solutions corresponding to "and / or" include any one of two or more of the related listed items, as well as any and all combinations of the related listed items. These arbitrary and all combinations include any two related listed items, any more related listed items, or a combination of all related listed items. For example, "A and / or B" represents a group consisting of A, B, and "a combination of A and B". "Containing A and / or B" can mean "containing A, containing B, and containing A and B", or "containing A, containing B, or containing A and B", and can be appropriately understood according to the context.

[0037] In this application, the terms "first aspect," "second aspect," "third aspect," "fourth aspect," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor should they be construed as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first," "second," "third," "fourth," etc., serve only as a non-exhaustive enumeration and should be understood not to constitute a closed limitation on quantity.

[0038] Example 1 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.5; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material includes the following steps: (1) Weigh La2O3, SrCO3, MnO2, CeO2, Y2O3 and ZrO2 according to the stoichiometric ratio, mix the weighed raw materials with anhydrous ethanol, and then ball mill them together; The mass ratio of material to balls in the ball mill was 1:2, the rotation speed was 450 rpm, and the time was 24 hours. (2) Transfer the slurry obtained after ball milling in step (1) to an oven and dry it at 80°C for 24 hours. Grind the dried powder thoroughly in a mortar and sieve it to obtain a mixed powder. (3) The mixed powder obtained in step (2) was pressed into a green body at 5 MPa using a uniaxial tablet press, and then the green body was subjected to cold isostatic pressing at 220 MPa. (4) The green body obtained by cold isostatic pressing in step (3) is pre-sintered, cooled in the furnace after pre-sintering, and then ball-milled, dried and sieved to obtain thermal barrier coated ceramic material. Pre-sintering is carried out in a muffle furnace: first, it is heated to 1000°C at a rate of 5°C / min, and then further heated to 1200°C at a rate of 2°C / min, and held at this temperature for 10 hours.

[0039] Example 2 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.1; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0040] Example 3 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.2; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0041] Example 4 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.3; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0042] Example 5 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.4; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0043] Example 6 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.6; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0044] Example 7 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.7; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0045] Example 8 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.5; The composite material contains 5% by mass of lanthanum strontium manganate. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0046] Example 9 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La0.8-x Ce x Sr 0.2 MnO3, x is 0.5; The composite material contains 10% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0047] Example 10 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.5; The composite material contains 20% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0048] Example 11 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.5; The mass percentage of lanthanum strontium manganate in the composite material is 25%. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0049] Example 12 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.5; The composite material contains 50% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0050] Example 13 This embodiment provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.5; The composite material contains 90% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this embodiment, the preparation method of the thermal barrier coating ceramic material is the same as that in Example 1.

[0051] Comparative Example 1 This comparative example provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8 Sr 0.2 MnO3; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 6%; In this comparative example, the preparation method of the thermal barrier coating ceramic material is the same as in Example 1, except that the addition of CeO2 is omitted.

[0052] Comparative Example 2 This comparative example provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8 Sr 0.2 MnO3; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 7%; In this comparative example, the preparation method of the thermal barrier coating ceramic material is the same as in Example 1, except that the addition of CeO2 is omitted.

[0053] Comparative Example 3 This comparative example provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8 Sr 0.2 MnO3; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this comparative example, the preparation method of the thermal barrier coating ceramic material is the same as in Example 1, except that the addition of CeO2 is omitted.

[0054] Comparative Example 4 This comparative example provides a thermal barrier coating ceramic material, which includes a composite material, wherein the composite material is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The chemical formula of the lanthanum strontium manganate is (La 0.8 Sr 0.2 MnO3; The composite material contains 15% lanthanum strontium manganate by mass. In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 9%; In this comparative example, the preparation method of the thermal barrier coating ceramic material is the same as in Example 1, except that the addition of CeO2 is omitted.

[0055] Comparative Example 5 This comparative example provides a thermal barrier coated ceramic material, wherein the thermal barrier coated ceramic material is only lanthanum strontium manganate; The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, x is 0.5; In this comparative example, the preparation method of the thermal barrier coating ceramic material is the same as in Example 1, except that the addition of Y2O3 and ZrO2 is omitted.

[0056] Comparative Example 6 This comparative example provides a thermal barrier coated ceramic material, wherein the thermal barrier coated ceramic material is yttrium oxide stabilized zirconium oxide; In the yttrium oxide-stabilized zirconium oxide, the mass percentage of yttrium oxide is 8%; In this comparative example, the preparation method of the thermal barrier coating ceramic material is the same as in Example 1, except that the addition of La2O3, SrCO3, MnO2 and CeO2 is omitted.

[0057] Test Example 1 The coating samples prepared according to the same process in Examples 1-13 and Comparative Examples 1-6 were subjected to infrared emissivity testing under the same conditions. The testing equipment was a Fourier transform infrared spectrometer (FTIR) equipped with an integrating sphere accessory, the testing temperature was 700℃, and the wavelength range was 3μm~5μm. The coating surface was subjected to standardized cleaning treatment before testing.

[0058] The performance test results of Examples 1-13 and Comparative Examples 1-6 are shown in Table 1.

[0059] Table 1 It should be noted that (La) 0.8-x Ce x Sr 0.2 The mass percentage of MnO3 in the composite material is m wt%, and the mass percentage of Y2O3 in yttrium oxide-stabilized zirconia is n wt%.

[0060] Based on the above test results, it can be seen that: (1) By comparing Comparative Examples 5 and 6, it can be seen that when Ce-doped lanthanum strontium manganate is used alone as a thermal barrier coating ceramic material, the infrared emissivity is 0.465; when yttrium-stabilized zirconium oxide is used alone as a thermal barrier coating ceramic material, the infrared emissivity of 8wt% Y2O3·ZrO2 at 700℃ is as high as 0.533, indicating that it has strong infrared radiation capability, which is not conducive to suppressing radiation heat transfer.

[0061] (2) As can be seen from Comparative Examples 1-4, this application has controlled the content of yttrium oxide in the yttrium oxide-stabilized zirconium oxide composite material of undoped Ce lanthanum strontium manganate and yttrium oxide-stabilized zirconium oxide. When the yttrium oxide content is 8%, La 0.8 Sr 0.2 MnO3-nY2O3·ZrO2 has a low infrared emissivity.

[0062] (3) As can be seen from Examples 1 and 8-13, this application has optimized the mass percentage content of lanthanum strontium manganate in the composite material of lanthanum strontium manganate and yttrium oxide-stabilized zirconium oxide. When the mass percentage content of lanthanum strontium manganate is in the range of 5% to 90%, when (La 0.8-x Ce x Sr 0.2 When the mass percentage of MnO3 in the composite material is 15%, the infrared emissivity is relatively low. However, when the mass percentage of lanthanum-strontium manganate is too low (e.g., 5%), the infrared emissivity increases; similarly, when the mass percentage of lanthanum-strontium manganate is too high (e.g., above 25%), the infrared emissivity also increases.

[0063] (4) By comparing Examples 1-7 with Comparative Example 3, it can be seen that this application, by performing Ce doping and controlling the Ce doping amount within the range of 0.1-0.7, (La 0.8-x Ce x Sr 0.2 The infrared emissivity of the MnO3-nY2O3·ZrO2 thermal barrier coated ceramic material is significantly reduced, reaching 0.291~0.331, with the lowest emissivity observed when the value was adjusted to 0.5 in Example 1. This indicates that the introduction of Ce at the La site of lanthanum strontium manganate... 3+ / Ce 4+ By utilizing the variable valence properties and charge transfer absorption mechanism of Ce ions, the infrared radiation capability of thermal barrier coated ceramic materials in the 3μm~5μm mid-infrared band at 700℃ can be effectively suppressed.

[0064] (5) By comparing Examples 1-7 and Comparative Example 6, it can be seen that the thermal barrier coating ceramic material obtained by combining Ce-doped lanthanum strontium manganate with yttrium oxide-stabilized zirconium oxide in this application can effectively suppress the radiation capability of the thermal barrier coating ceramic material in the 3μm-5μm mid-infrared band at 700℃. Compared with the single yttrium oxide-stabilized zirconium oxide system, (La 0.8-x Ce x Sr 0.2 The infrared emissivity of MnO3-nY2O3·ZrO2 thermal barrier coated ceramic materials is significantly reduced, reaching as low as 0.291.

[0065] In summary, this application introduces Ce into the La sites of lanthanum-strontium manganese salt by Ce doping modification. 3+ / Ce 4+ The lanthanum strontium manganate was combined with yttrium-stabilized zirconium oxide to form a composite material. By utilizing the variable valence characteristics and charge transfer absorption mechanism of Ce ions, the radiation capability of the thermal barrier coating ceramic material in the 3μm~5μm mid-infrared band at 700℃ was effectively suppressed, thus suppressing radiative heat flow at the source and meeting the cooling requirements.

[0066] The applicant declares that this application illustrates the thermal barrier coating ceramic material, its preparation method, and its application through the above embodiments, but this application is not limited to the above embodiments, that is, it does not mean that this application must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this application, equivalent substitutions of the raw materials of the product, addition of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this application.

[0067] The embodiments of this application have been described in detail above. However, this application is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this application, various simple modifications can be made to the technical solution of this application, and these simple modifications all fall within the protection scope of this application.

[0068] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A thermal barrier coating ceramic material, characterized in that, The thermal barrier coating ceramic material includes a composite material, which is a composite of lanthanum strontium manganate and yttrium oxide stabilized zirconium oxide; The lanthanum-strontium manganate is doped with Ce.

2. The thermal barrier coating ceramic material according to claim 1, characterized in that, The chemical formula of the lanthanum strontium manganate is (La 0.8-x Ce x Sr 0.2 MnO3, where x is 0.1~0.

7.

3. The thermal barrier coating ceramic material according to claim 1 or 2, characterized in that, In the composite material, the mass percentage of lanthanum strontium manganate is 1% to 90%.

4. The thermal barrier coating ceramic material according to any one of claims 1 to 3, characterized in that, In the composite material, the mass percentage of lanthanum strontium manganate is 10% to 20%.

5. The thermal barrier coating ceramic material according to any one of claims 1 to 4, characterized in that, In the yttrium-stabilized zirconium oxide, the mass percentage of yttrium oxide is 6% to 9%.

6. A method for preparing a thermal barrier coating ceramic material according to any one of claims 1 to 5, characterized in that, The preparation method is a solid-phase synthesis method, which includes the following steps: (1) Weigh La2O3, SrCO3, MnO2, CeO2, Y2O3 and ZrO2 according to the stoichiometric ratio, mix the weighed raw materials with anhydrous ethanol, and then ball mill them together; (2) The slurry obtained after ball milling in step (1) is dried and sieved to obtain a mixed powder; (3) Press the mixed powder obtained in step (2) into a green body, and then perform cold isostatic pressing on the green body; (4) The green body obtained by cold isostatic pressing in step (3) is pre-sintered, cooled in the furnace after pre-sintering, and then ball-milled, dried and sieved to obtain the thermal barrier coating ceramic material.

7. The preparation method according to claim 6, characterized in that, In step (1), the mass ratio of material to balls in the ball milling mixture is 1:2 to 1:5; And / or, the ball milling speed is 400 rpm to 500 rpm; And / or, the ball milling mixing time is 6h~24h.

8. The preparation method according to claim 6 or 7, characterized in that, The pressure for pressing the green body in step (3) is 5 MPa to 10 MPa; And / or, the pressure of the cold isostatic pressing is 200MPa~250MPa; And / or, the tablet press that compresses the green tablet is a single-shaft tablet press.

9. The preparation method according to any one of claims 6 to 8, characterized in that, The pre-sintering in step (4) includes a first stage of heating and a second stage of heating performed sequentially; The heating rate of the first stage is 5℃ / min~7℃ / min, and the final temperature is 1000℃~1100℃; The heating rate of the second stage is 2℃ / min~4℃ / min, the final temperature is 1200℃~1300℃, and the holding time is 10h~12h; And / or, the pre-sintering is carried out in an oxygen-containing atmosphere, the gas used in the oxygen-containing atmosphere including air.

10. A thermal barrier coating, characterized in that, The thermal barrier coating comprises the thermal barrier coating ceramic material according to any one of claims 1-5, or the thermal barrier coating ceramic material prepared by the preparation method according to any one of claims 6-9.

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