Preparation method and application of high near-infrared reflectivity high-entropy yttrium-zirconate-based thermal insulation coating powder

Abstract

The present application relates to high-entropy yttrium zirconate-based powder technical field, specifically relates to a kind of high near-infrared reflectivity high-entropy yttrium zirconate-based heat insulation coating powder and its preparation method and application.Preparation method includes: yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt are mixed, and material is obtained;Material, zirconium salt and citric acid monohydrate are mixed, and mixed material is obtained;Mixed material is crushed to paste, after drying treatment, it is crushed, and calcination is carried out, after cooling, high near-infrared reflectivity high-entropy yttrium zirconate-based powder is obtained.The present application is successfully prepared by using low-temperature solid phase method high near-infrared reflectivity high-entropy yttrium zirconate-based powder, not only overcome the shortcomings that raw material mixing is long time-consuming and difficult to realize uniform mixing of high-temperature solid phase method, also solve the problem that preparation process is complex, and poor product uniformity is easily caused by coprecipitation method, and the problems of long production cycle, high cost of sol-gel method, long synthesis cycle, limited yield and higher requirements for equipment performance of hydrothermal method.

Description

Technical Field

[0001] This invention relates to the field of high-entropy yttrium zirconate-based powder technology, specifically to a high-near-infrared reflectance high-entropy yttrium zirconate-based heat-insulating coating powder, its preparation method, and its application. Background Technology

[0002] Titanium alloys are among the most difficult industrial metals to precision cast. This is because titanium alloys have high chemical reactivity and can react chemically with almost all refractory materials in the molten state, leading to a decrease in melt quality. Therefore, applying heat-insulating coatings to the lining, mold, and core surfaces of titanium alloy casting furnaces can improve their surface refractoriness, chemical stability, and resistance to metal erosion, while also providing the following functions: (1) protecting the furnace lining, metal mold, and core; (2) facilitating casting demolding; (3) improving the surface quality of castings; (4) improving casting forming; and (5) controlling the heat transfer rate at the mold wall interface.

[0003] At temperatures above 1200℃, heat transfer is primarily radiative. Thermal radiation at high temperatures is mainly concentrated in the short-wave infrared region. Therefore, powders with excellent near-infrared reflectivity can be used as functional fillers in thermal insulation coatings. The application of these coatings in high-temperature furnace linings, molds, and core surfaces shows promising potential.

[0004] Zirconate materials possess excellent properties such as high melting point, good thermal stability, and low thermal conductivity, making them widely used in thermal barrier coatings, high-temperature catalyst supports, information detection, fluorescent materials, and photocatalytic materials. High-entropy materials, due to their unique crystal structure and variable chemical composition, exhibit a broad range of compositional and performance control options, as well as various special effects not found in single-principal materials. Among these, four core effects are the thermodynamic high-entropy effect, the structural lattice distortion effect, the kinetic hysteresis diffusion effect, and the performance "cocktail" effect. The combined effect of these factors gives them superior properties that distinguish them from traditional single-principal materials.

[0005] Currently, the main methods for preparing high-entropy yttrium zirconate-based powders include high-temperature solid-state methods, co-precipitation methods, sol-gel methods, and hydrothermal methods. However, each of these methods has its own limitations. High-temperature solid-state methods are time-consuming because it is difficult to ensure uniform mixing of raw materials (usually using ball milling, which takes more than 3 hours). The co-precipitation method has a relatively complex preparation process; if the ion concentration in the solvent is too high or the precipitant is added too quickly, it can easily lead to excessively high local concentrations, resulting in poor product uniformity. The sol-gel method has a long production cycle, requires long aging treatment, and has a high overall cost. As for the hydrothermal method, its synthesis cycle is long, the yield is limited, and it has high requirements for equipment performance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a high-near-infrared reflectance high-entropy yttrium zirconate-based thermal insulation coating powder, its preparation method, and its applications. The invention involves mixing yttrium salt, lanthanum salt, cerium salt, europium salt, and samarium salt to obtain a material; mixing the material, zirconium salt, and citric acid monohydrate to obtain a mixture; pulverizing the mixture into a paste and drying it to obtain a high-entropy yttrium zirconate-based powder precursor; and pulverizing and calcining the high-entropy yttrium zirconate-based powder precursor to obtain high-near-infrared reflectance high-entropy yttrium zirconate-based powder. This invention employs a low-temperature solid-state method, which not only overcomes the drawbacks of the high-temperature solid-state method, such as long mixing time and difficulty in achieving uniform mixing, but also solves the problems of complex preparation processes and poor product uniformity in the co-precipitation method, as well as the long production cycle and high cost of the sol-gel method, and the long synthesis cycle, limited yield, and high equipment performance requirements of the hydrothermal method.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] The first objective of this invention is to provide a method for preparing a high-near-infrared reflectance, high-entropy yttrium zirconate-based thermal insulation coating powder, comprising the following steps:

[0009] S1. Yttrium salt, lanthanum salt, cerium salt, europium salt, and samarium salt are mixed to obtain the material; wherein, Y 3+ :La 3+ Ce 3+ Eu 3+ Sm 3+ The molar ratio is 1:1:1:1:1; in high-entropy materials, at least one lattice contains four or more elements in equal or approximately equal molar ratios, meaning that no single element dominates the system. Therefore, the five metal salts are mixed in equal molar ratios of metal cations.

[0010] S2. Mix the material, zirconium salt, and citric acid monohydrate to obtain a mixture; wherein, the material, Zr 4+ The molar ratio of yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt to zirconium salt is 1:1:1 to 2. The metal nitrates are weighed and mixed according to the stoichiometric ratio of A2B2O7. The first five metal cations occupy the A site together, and the zirconium ion occupies the B site. That is, the total molar amount of yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt is 1:1 with the molar ratio of zirconium salt.

[0011] S3. The mixture is pulverized into a paste. During the pulverization process, some metal ions combine with the carboxyl groups in citric acid monohydrate to form metal carboxylate complexes; some metal ions construct metal oxide network structures through bridging. After drying, the free water in the metal carboxylate complexes evaporates and escapes, forming a loose and porous structure, thus obtaining a high-entropy yttrium zirconate-based powder precursor.

[0012] S4. After pulverizing the high-entropy yttrium zirconate-based powder precursor, it is calcined. During the calcination process, the water of crystallization and physically adsorbed water in the high-entropy yttrium zirconate-based powder precursor are removed; the metal carboxylate complex undergoes oxidative decomposition, citric acid undergoes oxidative combustion, and the remaining metal oxides undergo solid-phase reactions to form Y. 3+ La 3+ Ce 3+ Eu 3+ 、Sm 3+ A uniformly distributed yttrium zirconate-based solid solution, upon cooling, yields high-entropy yttrium zirconate-based powder with high near-infrared reflectance.

[0013] Preferably, the yttrium salt, lanthanum salt, cerium salt, europium salt, samarium salt, and zirconium salt are hydrated yttrium salts, lanthanum salts, cerium salts, europium salts, samarium salts, and zirconium salts containing anions.

[0014] Preferably, the anions in yttrium salts, lanthanum salts, cerium salts, europium salts, samarium salts, and zirconium salts are each independently selected from nitrate or carbonate ions; metal salts such as chloride or hypochlorite are not acceptable.

[0015] Preferably, the calcination conditions are: heating at 3℃ / min to 5℃ / min to 1000℃ to 1200℃ and holding at that temperature for 3h to 5h.

[0016] Preferably, the conditions for grinding the mixture are: manual grinding for 20 to 45 minutes at room temperature.

[0017] Preferably, the particle size of the pulverized mixture is less than 74 μm. If the particle size is too large, the mixing will be uneven, the contact area between yttrium salt, lanthanum salt, cerium salt, europium salt, samarium salt, zirconium salt and citric acid monohydrate will be too small, and the reactivity will be reduced.

[0018] Preferably, the high-entropy yttrium zirconate-based powder precursor is ground to a particle size of less than 74 μm. If the particle size is too large, it will lead to uneven mixing, insufficient contact, and reduced reactivity.

[0019] Preferably, the drying conditions are: drying at 100℃~110℃ to constant weight; wherein, if the temperature is too low or the time is too short, the moisture in the high-entropy yttrium zirconate powder precursor cannot be fully evaporated and escaped, resulting in a loose and porous high-entropy yttrium zirconate powder precursor, which reduces the reactivity of the high near-infrared reflectance high-entropy yttrium zirconate powder; while if the temperature is too high, it will cause the decomposition of citric acid monohydrate, affecting the structure of the high-entropy yttrium zirconate powder precursor.

[0020] The second objective of this invention is to provide a high-near-infrared reflectance, high-entropy yttrium zirconate-based thermal insulation coating powder prepared by the above-described method.

[0021] Preferably, the high near-infrared reflectance high-entropy yttrium zirconate-based powder has a defective fluorite phase crystal form.

[0022] The third objective of this invention is to provide the application of the above-mentioned high near-infrared reflectance, high-entropy yttrium zirconate-based thermal insulation coating powder in the preparation of thermal insulation coatings.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. This invention provides a method for preparing high near-infrared reflectance, high-entropy yttrium zirconate-based heat-insulating coating powder, comprising mixing yttrium salt, lanthanum salt, cerium salt, europium salt, and samarium salt to obtain the material; wherein, Y... 3+ :La 3+ Ce 3+ Eu 3+ Sm 3+ The molar ratio is 1:1:1:1:1; the material, zirconium salt, and citric acid monohydrate are mixed to obtain a mixture; wherein, the material, Zr 4+ The molar ratio of citric acid monohydrate to citric acid is 1:1:1-2. The mixture is pulverized into a paste. During the pulverization process, some metal ions combine with the carboxyl groups in citric acid monohydrate through coordination bonds to form metal carboxylate complexes. These complexes have low bond energy and are easily broken. Simultaneously, the gaps between the metal carboxylate complexes are relatively large, facilitating diffusion. Some metal ions construct a metal oxide network structure through bridging. After drying, the free water in the metal carboxylate complexes evaporates, forming a loose and porous structure, yielding a high-entropy yttrium zirconate-based powder precursor. The high-entropy yttrium zirconate-based powder precursor is pulverized and calcined. During calcination, the water of crystallization and physically adsorbed water in the high-entropy yttrium zirconate-based powder precursor are removed. The metal carboxylate complexes undergo oxidative decomposition, citric acid oxidizes and burns, and the remaining metal oxides undergo a solid-phase reaction to form Y. 3+ La 3+ Ce 3+ Eu 3+ 、Sm 3+ A uniformly distributed yttrium zirconate-based solid solution, upon cooling, yields high-entropy yttrium zirconate-based powder with high near-infrared reflectance.

[0025] Compared with the currently used high-temperature solid-phase reaction method and solid-phase precipitation method, the present invention adopts a low-temperature solid-phase method, which not only overcomes the disadvantages of the high-temperature solid-phase method, such as long raw material mixing time and difficulty in achieving uniform mixing, but also solves the problems of complex preparation process and poor product uniformity of co-precipitation method, as well as the problems of long production cycle and high cost of sol-gel method, and long synthesis cycle (generally more than 24 hours) and limited output of hydrothermal method and high requirements for equipment performance.

[0026] 2. The high near-infrared reflectivity high-entropy yttrium zirconate-based powder prepared by this invention has a phase composition that is basically a single defective fluorite phase. This single defective fluorite phase enables the high near-infrared reflectivity high-entropy yttrium zirconate-based powder to exhibit high near-infrared reflectivity. Furthermore, lattice defects in the defective fluorite phase, such as oxygen vacancies, can enhance the near-infrared reflectivity of the high near-infrared reflectivity high-entropy yttrium zirconate-based powder by influencing electron transitions and scattering processes. Simultaneously, the presence of oxygen vacancies also disrupts the originally regular lattice structure, causing phonons and electrons to be scattered during propagation, thereby significantly reducing the thermal conductivity of the high near-infrared reflectivity high-entropy yttrium zirconate-based powder.

[0027] Furthermore, the high near-infrared reflectance high-entropy yttrium zirconate-based thermal insulation coating powder prepared by this invention has high purity and high near-infrared reflectance, with an average near-infrared reflectance of 89%.

[0028] The high near-infrared reflectance high-entropy yttrium zirconate-based thermal insulation coating powder prepared by this invention has small particle size, uniform distribution, and high sintering activity.

[0029] 3. The preparation method of the present invention has the characteristics of simple process, low equipment requirements, short production cycle and can be used for industrial production. Attached Figure Description

[0030] Figure 1 The image shows the X-ray diffraction pattern of the high near-infrared reflectance, high-entropy yttrium zirconate-based powder prepared in Example 1.

[0031] Figure 2 The image shows the near-infrared reflectance of the high-entropy yttrium zirconate-based powder with high near-infrared reflectance prepared in Example 1.

[0032] Figure 3 This is a TEM image of the high near-infrared reflectance, high-entropy yttrium zirconate-based powder prepared in Example 1. Detailed Implementation

[0033] The technical solution of the present invention will be clearly and completely described below with reference to the data in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that the technical terms used in this invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of this invention. Unless otherwise specified, all raw materials, reagents, instruments and equipment used in the following embodiments of this invention can be purchased on the market or prepared by existing methods.

[0035] Among them, the purity of yttrium nitrate hexahydrate is ≥99%, and the particle size of yttrium nitrate hexahydrate is ≤74μm; the purity of lanthanum nitrate hexahydrate is ≥99%, and the particle size of lanthanum nitrate hexahydrate is ≤74μm; the purity of cerium nitrate hexahydrate is ≥99%, and the particle size of cerium nitrate hexahydrate is ≤74μm; the purity of samarium nitrate hexahydrate is ≥99%, and the particle size of samarium nitrate hexahydrate is ≤74μm; the purity of europium nitrate pentahydrate is ≥99%, and the particle size of europium nitrate pentahydrate is ≤74μm; the purity of zirconium nitrate pentahydrate is ≥99%, and the particle size of zirconium nitrate pentahydrate is ≤74μm; and the purity of citric acid monohydrate is ≥99%, and the particle size of citric acid monohydrate is ≤74μm.

[0036] In existing technologies, methods for preparing high-entropy yttrium zirconate-based powders mainly include high-temperature solid-state methods, co-precipitation methods, sol-gel methods, and hydrothermal methods. However, each of these methods has its own limitations. High-temperature solid-state methods not only have a long mixing time for raw materials but also make it difficult to achieve uniform mixing. The co-precipitation method has a relatively complex preparation process; if the ion concentration in the solvent is too high or the precipitant is added too quickly, it can easily lead to excessively high local concentrations, resulting in poor product uniformity. The sol-gel method has a long production cycle, requires a long aging process, and has a high overall cost. As for the hydrothermal method, its synthesis cycle is long, the yield is limited, and it has high requirements for equipment performance.

[0037] To address the shortcomings of the existing technology, this invention provides a method for mixing yttrium salt, lanthanum salt, cerium salt, europium salt, and samarium salt to obtain a material; wherein, Y... 3+ :La 3+ Ce 3+ Eu 3+ Sm 3+ The molar ratio is 1:1:1:1:1; the material, zirconium salt, and citric acid monohydrate are mixed to obtain a mixture; wherein, the material, Zr 4+ The molar ratio of yttrium zirconate to citric acid monohydrate is 1:1:1-2. The mixture is pulverized into a paste. During pulverization, some metal ions combine with the carboxyl groups in citric acid monohydrate to form metal carboxylate complexes; other metal ions construct a metal oxide network structure through bridging. After drying, the free water in the metal carboxylate complex evaporates, forming a loose and porous structure, yielding a high-entropy yttrium zirconate-based powder precursor. The high-entropy yttrium zirconate-based powder precursor is pulverized and calcined. During calcination, the water of crystallization and physically adsorbed water in the high-entropy yttrium zirconate-based powder precursor are removed. The metal carboxylate complex undergoes oxidative decomposition, citric acid oxidizes and burns, and the remaining metal oxides undergo a solid-phase reaction to form Y2. 3+ La 3+ Ce 3+ Eu 3+ 、Sm 3+A uniformly distributed yttrium zirconate-based solid solution, upon cooling, yields high-entropy yttrium zirconate-based powder with high near-infrared reflectance.

[0038] Compared with the currently used high-temperature solid-phase reaction method and solid-phase precipitation method, the present invention adopts a low-temperature solid-phase method, which not only overcomes the disadvantages of the high-temperature solid-phase method, such as long raw material mixing time and difficulty in achieving uniform mixing, but also solves the problems of complex preparation process and poor product uniformity caused by co-precipitation method, as well as the problems of long production cycle and high cost of sol-gel method, long synthesis cycle and limited output of hydrothermal method and high requirements for equipment performance.

[0039] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below with reference to specific embodiments.

[0040] Example 1

[0041] A method for preparing high near-infrared reflectance high-entropy yttrium zirconate-based powder includes the following steps:

[0042] S1. Mix yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate, cerium nitrate hexahydrate, europium nitrate pentahydrate and samarium nitrate hexahydrate in a molar ratio of 1:1:1:1:1, then mix hydrated nitrate, zirconium nitrate pentahydrate and citric acid monohydrate in a molar ratio of 1:1:2 to obtain a mixture.

[0043] S2. Grind the mixture at room temperature for 30 minutes until it becomes a paste, and then dry it at 100°C for 12 hours to obtain a high-entropy yttrium zirconate-based powder precursor.

[0044] S3. After grinding the high-entropy yttrium zirconate-based powder precursor for 11 min, it was placed in an alumina crucible. The alumina crucible was then placed in a muffle furnace and heated to 1050℃ at a rate of 4℃ / min. The temperature was held for 4 h, cooled with the furnace, and then removed from the furnace to obtain high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[0045] Example 2

[0046] A method for preparing yttrium zirconate powder with high near-infrared reflectance includes the following steps:

[0047] S1. Mix yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate, cerium nitrate hexahydrate, europium nitrate pentahydrate and samarium nitrate hexahydrate in a molar ratio of 1:1:1:1:1, then mix hydrated nitrate, zirconium nitrate pentahydrate and citric acid monohydrate in a molar ratio of 1:1:2 to obtain a mixture.

[0048] S2. Grind the mixture at room temperature for 45 minutes to form a paste, and then dry it at 110°C for 2 hours to obtain the yttrium zirconate-based powder precursor.

[0049] S3. After grinding the high-entropy yttrium zirconate-based powder precursor for 13 min, it was placed in an alumina crucible. Then, the alumina crucible was placed in a muffle furnace and heated to 1150℃ at a rate of 3℃ / min, held for 3 h, cooled with the furnace, and removed from the furnace to obtain high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[0050] Example 3

[0051] A method for preparing high near-infrared reflectance high-entropy yttrium zirconate-based powder includes the following steps:

[0052] S1. Mix yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate, cerium nitrate hexahydrate, europium nitrate pentahydrate and samarium nitrate hexahydrate in a molar ratio of 1:1:1:1:1, then mix hydrated nitrate, zirconium nitrate pentahydrate and citric acid monohydrate in a molar ratio of 1:1:2 to obtain a mixture.

[0053] S2. Grind the mixture at room temperature for 20 minutes until it becomes a paste, and then dry it at 100°C for 8 hours to obtain a high-entropy yttrium zirconate-based powder precursor.

[0054] S3. After grinding the high-entropy yttrium zirconate-based powder precursor for 10 min, it was placed in an alumina crucible. Then, the alumina crucible was placed in a muffle furnace and heated to 1200℃ at a rate of 5℃ / min. It was held for 5 h and cooled with the furnace. The powder was then removed from the furnace to obtain high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[0055] Example 4

[0056] A method for preparing high near-infrared reflectance high-entropy yttrium zirconate-based powder includes the following steps:

[0057] S1. Mix yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate, cerium nitrate hexahydrate, europium nitrate pentahydrate and samarium nitrate hexahydrate in a molar ratio of 1:1:1:1:1, and then mix hydrated nitrate, zirconium nitrate pentahydrate and citric acid monohydrate in a molar ratio of 1:1:1 to obtain a mixture.

[0058] S2. Grind the mixture at room temperature for 30 minutes until it becomes a paste, and then dry it at 110°C for 4 hours to obtain a high-entropy yttrium zirconate-based powder precursor.

[0059] S3. After grinding the high-entropy yttrium zirconate-based powder precursor for 15 min, it was placed in an alumina crucible. Then, the alumina crucible was placed in a muffle furnace and heated to 1200℃ at a rate of 3℃ / min, held for 3 h, cooled with the furnace, and removed from the furnace to obtain high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[0060] observe Figure 1It was found that the high near-infrared reflectance high-entropy yttrium zirconate-based powder prepared in Example 1 of the present invention has a crystal form consisting entirely of defective fluorite phase, indicating that the high near-infrared reflectance high-entropy yttrium zirconate-based powder prepared in the present invention has high purity.

[0061] observe Figure 2 The results show that the high near-infrared reflectance high-entropy yttrium zirconate-based powder prepared in Example 1 of the present invention has a near-infrared reflectance of up to 97% and an average value of 89%, indicating that the high near-infrared reflectance high-entropy yttrium zirconate-based powder prepared in the present invention has high near-infrared reflectance.

[0062] observe Figure 3 It is found that the high near-infrared reflectance high-entropy yttrium zirconate-based powder obtained in Example 1 of the present invention has uniform and complete grain growth, small particle size, and uniform particle size distribution of 10nm to 50nm.

[0063] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range, as well as any value between the two endpoints, can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this invention.

Claims

1. A preparation method of high near-infrared reflectivity high-entropy yttrium zirconate-based thermal barrier coating powder, characterized by, The method comprises the following steps: Mixing yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt to obtain a material; wherein the molar ratio of Y 3+ : La 3+ : Ce 3+ : Eu 3+ : Sm 3+ is 1:1:1:1:

1. Mixing the material, the zirconium salt and the monohydrate citric acid to obtain a mixture; wherein the molar ratio of the material, the zirconium salt and the monohydrate citric acid is 1:1:1~2. 4+ 1:1:1~2. The mixture is crushed into a paste, and in the crushing process, part of the metal ions are combined with the carboxyl groups in the monohydrate citric acid to form metal carboxylate complexes; part of the metal ions construct a metal oxide network structure through a bridging mode, and after drying treatment, the free water in the metal carboxylate complexes evaporates and escapes, forming a loose and porous structure, thereby obtaining a high-entropy yttrium zirconate-based powder precursor; After the high-entropy yttrium zirconate-based powder precursor is crushed, calcination is performed, during which the crystallization water and the physical adsorption water in the high-entropy yttrium zirconate-based powder precursor are removed; the metal carboxylate complex is oxidized and decomposed, the citric acid is oxidized and combusted, and a solid-phase reaction occurs between the remaining metal oxides to form a Y 3+ , La 3+ , Ce 3+ , Eu 3+ , Sm 3+ uniformly distributed yttrium zirconate-based solid solution, and after cooling, a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity is obtained. The acid radical ions in the yttrium salt, lanthanum salt, cerium salt, europium salt, samarium salt and zirconium salt are independently selected from nitrate or carbonate.

2. The method for preparing high near-infrared reflectance, high-entropy yttrium zirconate-based heat-insulating coating powder according to claim 1, characterized in that, The calcination condition is: 1000-1200℃ for 3-5h.

3. The method for preparing high near-infrared reflectance, high-entropy yttrium zirconate-based heat-insulating coating powder according to claim 1, characterized in that, The crushing condition of the mixture is: manual grinding at room temperature for 20-45min.

4. The method for preparing high near-infrared reflectance, high-entropy yttrium zirconate-based heat-insulating coating powder according to claim 1, characterized in that, The drying treatment condition is: drying at a constant weight at 100-110℃.

5. A high-entropy yttrium zirconate-based heat-insulating coating powder with high near-infrared reflectivity, which is prepared by the preparation method in any one of claims 1-4. 6.The high near-infrared reflectivity high-entropy yttrium-zirconate-based thermal barrier coating powder according to claim 5, characterized in that, The crystal form of the high-entropy yttrium zirconate-based powder is a defective fluorite phase.

7. Application of the high-entropy yttrium zirconate-based heat-insulating coating powder with high near-infrared reflectivity in claim 5 in the preparation of a heat-insulating coating.

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