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

Abstract

The invention relates to the technical field of high-entropy yttrium zirconate-based powder, in particular to high-near-infrared-reflectivity high-entropy yttrium zirconate-based thermal insulation coating powder as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt to obtain a material; mixing the material, zircon salt and citric acid monohydrate to obtain a mixture; and crushing the mixture into paste, drying, crushing, calcining, and cooling to obtain the high-near-infrared-reflectivity high-entropy yttrium zirconate-based powder. The yttrium zirconate-based powder with high near-infrared reflectivity and high entropy is successfully prepared by adopting a low-temperature solid-phase method, so that the defects that raw materials are relatively long in mixing time and difficult to uniformly mix in a high-temperature solid-phase method are overcome, and the problems that a co-precipitation method is complicated in preparation process and is easy to cause poor product uniformity are solved; the problems that a sol-gel method is long in production period and high in cost, and a hydrothermal method is long in synthesis period, limited in yield and high in equipment performance requirement are solved.

Description

Technical Field

[0001] The invention relates to the technical field of high-entropy yttrium zirconate-based powders, and in particular to high-near-infrared reflectivity high-entropy yttrium zirconate-based thermal insulation coating powder, and a preparation method and application thereof. Background Art

[0002] Titanium alloy is one of the most difficult industrial metals to precision cast. Because titanium alloy has high chemical activity, it can react chemically with almost all refractory materials in the molten state, causing the melt quality to deteriorate. Therefore, coating the surface of the titanium alloy melting furnace lining, mold and core with thermal insulation coating can improve its surface refractoriness, chemical stability, metal erosion resistance and other properties and has the following functions: (1) protect the furnace lining, metal mold and core; (2) facilitate demolding of castings; (3) improve the surface quality of castings; (4) improve the molding of castings; (5) control the heat transfer rate of the mold wall interface.

[0003] At high temperatures above 1200℃, the heat transfer mechanism is mainly radiation heat transfer. Thermal radiation at high temperatures is mainly concentrated in the infrared short-wave region. Therefore, powders with good near-infrared reflection properties can be used in thermal insulation coatings as functional fillers. Thermal insulation coatings are used in high-temperature furnace linings, molds, and core surfaces, and their prospects are promising.

[0004] Zirconate materials have excellent properties such as high melting point, good thermal stability and low thermal conductivity. They are widely used in thermal barrier coatings, high temperature resistant catalyst carriers, information detection, fluorescent materials and photocatalytic materials. Due to their unique crystal structure and variable chemical composition, high entropy materials have a wide range of components, performance regulation space and various special effects that single principal component materials do not have. Among them, the four core effects are the high entropy effect in thermodynamics, the lattice distortion effect in structure, the hysteresis diffusion effect in kinetics and the "cocktail" effect in performance. Under the joint action of these effects, it has excellent performance that is different from traditional single principal component materials.

[0005] At present, the methods for preparing high-entropy yttrium zirconate-based powders mainly include high-temperature solid-phase method, coprecipitation method, sol-gel method and hydrothermal method. However, each of these methods has different limitations. The high-temperature solid-phase method is difficult to ensure uniform mixing of the raw materials, so the raw material mixing process takes a long time (usually ball milling is used, and the ball milling time exceeds 3h); the preparation process of the coprecipitation method is relatively complicated. If the ion concentration in the solvent is too high or the precipitant is added too quickly, it is easy to cause excessive local concentration, resulting in poor product uniformity; the sol-gel method has a long production cycle, requires a long aging treatment, and the overall cost is high; as for the hydrothermal method, its synthesis cycle is long, the output is limited, and the performance requirements of the equipment are high. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder and its preparation method and application. The present invention mixes yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt to obtain a material; the material, zirconium salt and monohydrated citric acid are mixed to obtain a mixture; the mixture is crushed into a paste, and a high entropy yttrium zirconate-based powder precursor is obtained after drying; the high entropy yttrium zirconate-based powder precursor is crushed and calcined to obtain a high near-infrared reflectivity high entropy yttrium zirconate-based powder. The present invention adopts a low-temperature solid phase method, which not only overcomes the shortcomings of the high-temperature solid phase method that the raw material mixing takes a long time and is difficult to achieve uniform mixing, but also solves the problems of the complex preparation process of the coprecipitation method, which is easy to cause poor product uniformity, as well as the long production cycle and high cost of the sol-gel method, the long synthesis cycle of the hydrothermal method, the limited output and the high requirements for equipment performance.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The first object of the present invention is to provide a method for preparing a high near-infrared reflectivity 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 a material; wherein Y 3+ :La 3+ :Ce 3+ :Eu 3+ :Sm 3+ The molar ratio of is 1:1:1:1:1:1; the high entropy material has at least one lattice point containing four or more elements in equal or approximately equal molar ratios, that is, no single element dominates the system, so the five metal salts are mixed in equal molar ratios of metal cations.

[0010] S2, mixing 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 the molar ratio of zirconium salt is 1:1:1-2; the metal nitrates are weighed and mixed according to the stoichiometric ratio of A2B2O7, the first five metal cations jointly occupy the A position, and the zirconium ion occupies the B position, that is, the molar ratio of the total molar amount of yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt to the molar ratio of zirconium salt is 1:1.

[0011] S3. The mixture is crushed into a paste. During the crushing process, a portion of the metal ions combine with the carboxyl group in monohydrated citric acid to form a metal carboxylate complex; a portion of the metal ions construct a metal oxide network structure through a bridging mode. After drying, the free water in the metal carboxylate complex evaporates to form a loose and porous structure, thereby obtaining a high-entropy yttrium zirconate-based powder precursor.

[0012] S4. After the high entropy yttrium zirconate-based powder precursor is crushed, it is calcined. During the calcination process, the crystal water and physically adsorbed water in the high entropy yttrium zirconate-based powder precursor are removed; the metal carboxylate complex is oxidized and decomposed, and the citric acid is oxidized and burned, and the remaining metal oxides undergo a solid phase reaction to form Y 3+ ,La 3+ 、Ce 3+ 、Eu 3+ 、Sm 3+ The uniformly distributed yttrium zirconate-based solid solution is cooled to obtain a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

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

[0014] Preferably, 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, but not metal salts such as chloride or hypochlorite.

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

[0016] Preferably, the mixed material is crushed under the following conditions: manually grinding for 20 min to 45 min at room temperature.

[0017] Preferably, the particle size of the mixture after crushing is less than 74 μm. Too large a particle size will lead to uneven mixing, too small a contact area between the yttrium salt, lanthanum salt, cerium salt, europium salt, samarium salt, zirconium salt and citric acid monohydrate, and reduced reaction activity.

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

[0019] Preferably, the drying conditions are: drying at 100°C to 110°C to constant weight; wherein, if the temperature is too low or the time is too short, the moisture in the high-entropy yttrium zirconate-based powder precursor cannot fully evaporate and escape, forming a loose and porous high-entropy yttrium zirconate-based powder precursor, which reduces the reaction activity of the high near-infrared reflectivity high-entropy yttrium zirconate-based powder; and if the temperature is too high, the monohydrated citric acid will decompose, affecting the structure of the high-entropy yttrium zirconate-based powder precursor.

[0020] The second object of the present invention is to provide a high near-infrared reflectivity and high entropy yttrium zirconate-based thermal insulation coating powder prepared by the above preparation method.

[0021] Preferably, the crystal form of the high near-infrared reflectivity and high entropy yttrium zirconate-based powder is a defective fluorite phase.

[0022] The third object of the present invention is to provide the use of the above-mentioned high near-infrared reflectivity and high entropy yttrium zirconate-based thermal insulation coating powder in the preparation of thermal insulation coating.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention provides a method for preparing a high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder, wherein yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt are mixed to obtain a material; wherein Y 3+ :La 3+ :Ce 3+ :Eu 3+ :Sm 3+ The molar ratio of the material, the zirconium salt and the monohydrated citric acid is 1:1:1:1:1; the material, the zirconium salt and the monohydrated citric acid are mixed to obtain a mixture; wherein the material, the Zr 4+ The molar ratio of citric acid monohydrate to citric acid monohydrate is 1:1:1-2; the mixture is crushed into a paste, during the crushing process, a part of the metal ions are combined with the carboxyl group in the citric acid monohydrate by coordination bonds to form a metal carboxylate complex, which has a small bond energy and is easy to break. At the same time, the gaps between the metal carboxylate complexes are large and easy to diffuse; a part of the metal ions construct a metal oxide network structure through a bridging mode, and after drying, the free water in the metal carboxylate complex evaporates and escapes to form a loose and porous structure, thereby obtaining a high-entropy yttrium zirconate-based powder precursor; after crushing the high-entropy yttrium zirconate-based powder precursor, calcining is performed, and during the calcination process, the crystal water and physically adsorbed water in the high-entropy yttrium zirconate-based powder precursor are removed; the metal carboxylate complex undergoes oxidative decomposition, the citric acid is oxidatively burned, and the remaining metal oxides undergo a solid phase reaction to form Y 3+ ,La 3+ 、Ce 3+ 、Eu 3+ 、Sm 3+ The uniformly distributed yttrium zirconate-based solid solution is cooled to obtain a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[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 shortcomings of the high-temperature solid-phase method that the raw material mixing takes a long time and is difficult to achieve uniform mixing, but also solves the problems of the co-precipitation method having a complicated preparation process and easily causing poor product uniformity, as well as the sol-gel method having a long production cycle and high cost, and the hydrothermal method having a long synthesis cycle (generally greater than 24 hours), limited output and high requirements on equipment performance.

[0026] 2. The high near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared by the present invention has a physical phase composition of a single defective fluorite phase. This single defective fluorite phase enables the high near-infrared reflectivity and high entropy yttrium zirconate-based powder to exhibit a higher near-infrared reflection ability. In addition, the lattice defects in the defective fluorite phase, such as oxygen vacancies. In the high near-infrared reflectivity and high entropy yttrium zirconate-based powder, oxygen vacancies can improve its near-infrared reflection ability by affecting the transition and scattering process of electrons. At the same time, the presence of oxygen vacancies will also break the original regular lattice structure, causing phonons and electrons to be scattered during the propagation process, thereby significantly reducing the thermal conductivity of the high near-infrared reflectivity and high entropy yttrium zirconate-based powder.

[0027] In addition, the high near-infrared reflectivity and high entropy yttrium zirconate-based thermal insulation coating powder prepared by the present invention has high purity and high near-infrared reflectivity, and the average near-infrared reflectivity reaches 89%.

[0028] The high near-infrared reflectivity and high entropy yttrium zirconate-based thermal insulation coating powder prepared by the present 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the X-ray diffraction pattern of the high near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared in Example 1.

[0031] Figure 2 This is a near-infrared reflectivity graph of the high near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared in Example 1.

[0032] Figure 3 This is a TEM image of the high near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared in Example 1. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be clearly and completely described below in combination with the data in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the professional terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention. Unless otherwise specifically stated, the various raw materials, reagents, instruments and equipment used in the following embodiments of the present invention can be purchased from 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; the purity of citric acid monohydrate is ≥99%, and the particle size of citric acid monohydrate is ≤74μm.

[0036] In the prior art, the methods for preparing high-entropy yttrium zirconate-based powders mainly include high-temperature solid-phase method, coprecipitation method, sol-gel method and hydrothermal method. However, each of these methods has different limitations. The high-temperature solid-phase method not only takes a long time to mix the raw materials, but also makes it difficult to achieve uniform mixing of the raw materials; the preparation process of the coprecipitation method is relatively complicated. If the ion concentration in the solvent is too high or the precipitant is added too quickly, it is easy to cause excessive local concentration, resulting in poor product uniformity; the sol-gel method has a long production cycle, requires a long aging treatment, and has a high overall cost; as for the hydrothermal method, its synthesis cycle is long, the output is limited, and the performance requirements of the equipment are high.

[0037] In view of the defects of the above-mentioned prior art, the present invention provides a material obtained by mixing yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt; wherein Y 3+ :La 3+ :Ce 3+ :Eu 3+ :Sm 3+ The molar ratio of the material, the zirconium salt and the monohydrated citric acid is 1:1:1:1:1; the material, the zirconium salt and the monohydrated citric acid are mixed to obtain a mixture; wherein the material, the Zr 4+ The molar ratio of citric acid monohydrate to citric acid monohydrate is 1:1:1-2; the mixture is crushed into a paste, during the crushing process, a part of the metal ions combine with the carboxyl group in citric acid monohydrate to form a metal carboxylate complex; a part of the metal ions construct a metal oxide network structure through a bridging mode, and after drying, the free water in the metal carboxylate complex evaporates and escapes to form a loose porous structure, thereby obtaining a high-entropy yttrium zirconate-based powder precursor; after the high-entropy yttrium zirconate-based powder precursor is crushed, it is calcined, during the calcination process, the crystal water and physically adsorbed water in the high-entropy yttrium zirconate-based powder precursor are removed; the metal carboxylate complex undergoes oxidative decomposition, the citric acid is oxidatively burned, and the remaining metal oxides undergo a solid phase reaction to form Y 3+ ,La 3+ 、Ce 3+ 、Eu 3+ 、Sm 3+The uniformly distributed yttrium zirconate-based solid solution is cooled to obtain a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[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 shortcomings of the high-temperature solid-phase method that the raw material mixing takes a long time and is difficult to achieve uniform mixing, but also solves the problems of the co-precipitation method having a complex preparation process and easily causing poor product uniformity, as well as the sol-gel method having a long production cycle and high cost, and the hydrothermal method having a long synthesis cycle, limited output and high requirements on equipment performance.

[0039] In order to enable those skilled in the art to more clearly understand the technical solution of the present invention, the technical solution of the present invention will be described in detail below in conjunction with specific embodiments.

[0040] Example 1

[0041] A method for preparing a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity comprises the following steps:

[0042] S1. Yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate, cerium nitrate hexahydrate, europium nitrate pentahydrate and samarium nitrate hexahydrate are mixed in a molar ratio of 1:1:1:1:1, and then hydrated nitrate, zirconium nitrate pentahydrate and citric acid monohydrate are mixed 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. Grind the high entropy yttrium zirconate-based powder precursor for 11 minutes and put it into a corundum crucible; then place the corundum crucible in a muffle furnace, heat it to 1050°C at a rate of 4°C / min, keep it warm for 4 hours, cool it with the furnace, and take it out of the furnace to obtain a 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 reflectivity comprises the following steps:

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

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

[0049] S3. Grind the high entropy yttrium zirconate-based powder precursor for 13 minutes and put it into a corundum crucible; then place the corundum crucible in a muffle furnace, heat it to 1150°C at a rate of 3°C / min, keep it warm for 3 hours, cool it with the furnace, and take it out of the furnace to obtain a high entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[0050] Example 3

[0051] A method for preparing a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity comprises the following steps:

[0052] S1. Yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate, cerium nitrate hexahydrate, europium nitrate pentahydrate and samarium nitrate hexahydrate are mixed in a molar ratio of 1:1:1:1:1, and then hydrated nitrate, zirconium nitrate pentahydrate and citric acid monohydrate are mixed 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. Grind the high entropy yttrium zirconate-based powder precursor for 10 minutes and put it into a corundum crucible; then place the corundum crucible in a muffle furnace, heat it to 1200°C at a rate of 5°C / min, keep it warm for 5 hours, cool it with the furnace, and take it out of the furnace to obtain a high entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[0055] Example 4

[0056] A method for preparing a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity comprises the following steps:

[0057] S1. Yttrium nitrate hexahydrate, lanthanum nitrate hexahydrate, cerium nitrate hexahydrate, europium nitrate pentahydrate and samarium nitrate hexahydrate are mixed in a molar ratio of 1:1:1:1:1, and then hydrated nitrate, zirconium nitrate pentahydrate and citric acid monohydrate are mixed 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. Grind the high entropy yttrium zirconate-based powder precursor for 15 minutes and put it into a corundum crucible; then place the corundum crucible in a muffle furnace, heat it to 1200°C at a rate of 3°C / min, keep it warm for 3 hours, cool it with the furnace, and take it out of the furnace to obtain a high entropy yttrium zirconate-based powder with high near-infrared reflectivity.

[0060] observe Figure 1It was concluded that the crystal form of the high near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared in Example 1 of the present invention was all defective fluorite phase, indicating that the high near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared in the present invention had high purity.

[0061] observe Figure 2 It was found that the near-infrared reflectivity of the high near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared in Example 1 of the present invention was as high as 97%, and the average value was 89%, indicating that the near-infrared reflectivity and high entropy yttrium zirconate-based powder prepared in the present invention was high.

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

[0063] It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as those in the embodiment, in order to avoid redundancy, the present invention describes a preferred embodiment. Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the attached claims are intended to be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

Claims

1. A method for preparing a high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder, characterized in that: The steps include: Yttrium salt, lanthanum salt, cerium salt, europium salt and samarium salt are mixed 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 with citric acid monohydrate is 1:1:1-2; The mixed material is crushed into a paste. During the crushing process, a part of the metal ions combines with the carboxyl group in monohydrated citric acid to form a metal carboxylate complex; a part of the metal ions constructs a metal oxide network structure through a bridging mode. After drying, the free water in the metal carboxylate complex evaporates and escapes to form a loose porous structure, thereby obtaining a high-entropy yttrium zirconate-based powder precursor; The high entropy yttrium zirconate-based powder precursor is crushed and calcined. During the calcination process, the crystal water and physically adsorbed water in the high entropy yttrium zirconate-based powder precursor are removed; the metal carboxylate complex undergoes oxidative decomposition, the citric acid is oxidatively burned, and the remaining metal oxides undergo solid-phase reaction to form Y 3+ ,La 3+ 、Ce 3+ 、Eu 3+ 、Sm 3+ The uniformly distributed yttrium zirconate-based solid solution is cooled to obtain a high-entropy yttrium zirconate-based powder with high near-infrared reflectivity.

2. The method for preparing the high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder according to claim 1, characterized in that: The yttrium salt, lanthanum salt, cerium salt, europium salt, samarium salt and zirconium salt are hydrated yttrium salt, lanthanum salt, cerium salt, europium salt, samarium salt and zirconium salt containing acid ions.

3. The method for preparing the high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder according to claim 2, characterized in that: The acid ions in the yttrium salt, lanthanum salt, cerium salt, europium salt, samarium salt and zirconium salt are independently selected from nitrate or carbonate.

4. The method for preparing the high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder according to claim 1, characterized in that: The calcination conditions are: keeping warm at 1000℃~1200℃ for 3h~5h.

5. The method for preparing the high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder according to claim 1, characterized in that: The conditions for crushing the mixture are: manual grinding for 20 minutes to 45 minutes at room temperature.

6. The method for preparing the high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder according to claim 1, characterized in that: The drying conditions are: drying at 100°C to 110°C to constant weight.

7. A high near-infrared reflectivity and high entropy yttrium zirconate-based thermal insulation coating powder prepared by the preparation method according to any one of claims 1 to 6.

8. The high near-infrared reflectivity high entropy yttrium zirconate-based thermal insulation coating powder according to claim 7, characterized in that: The crystal form of high near-infrared reflectivity and high entropy yttrium zirconate-based powder is defective fluorite phase.

9. Use of the high near-infrared reflectivity and high entropy yttrium zirconate-based thermal insulation coating powder according to claim 7 in the preparation of thermal insulation coating.

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