48 results about "Pyrochlore" patented technology

The invention discloses a pyrochlore structure high-entropy ceramic solidified body material as well as a preparation method and application thereof, and belongs to the technical field of nuclear waste solidification. The preparation method of the high-entropy ceramic solidified body material with the pyrochlore structure comprises the following steps: weighing raw material powder of La2O3, Nd2O3, Sm2O3, Gd2O3, Eu2O3 and ZrO2 according to the proportion in (La0. 2Nd0. 2Sm0. 2Gd0. 2Eu0. 2) 2Zr2O7; the weighed raw material powder is subjected to ball milling treatment, and ball-milled powder is obtained; under the inert gas atmosphere, the ball-milled powder is subjected to heat treatment, and heat-treated powder is obtained; and carrying out spark plasma sintering on the heat treatment powder to obtain the pyrochlore structure high-entropy ceramic solidified body material. The powder is treated by using a heat treatment technology, so that the powder is homogenized, a pyrochlore phase is formed, grain growth is more favorably inhibited, a fine grain structure is obtained, and the irradiation stability and the mechanical property of the pyrochlore material are improved.

A multilayer ceramic electronic device includes an element body 10 including a multilayer portion in which a plurality of dielectric layers 11 and a plurality of internal electrode layers 12 are stacked, wherein at least one of the plurality of dielectric layers 11 includes a pyrochlore phase 50.

The present disclosure provides a ceramic material for a thermal barrier coating and a manufacturing method thereof. A chemical composition of the ceramic material is LaYbZrCeO7. The ceramic material is manufactured by doping LaO1.5, YbO1.5 and CeO2 into ZrO2. A mole ratio of LaO1.5, YbO1.5, CeO2 and ZrO2 is 1:1:1:1. The manufactured ceramic material is in a composite phase structure mainly including a pyrochlore phase and a fluorite phase. The ceramic material according to the present disclosure can effectively inhibit corrosion penetration of molten CMAS in a high temperature environment, which reduces or avoids ceramic cracking and peeling. This better maintains microstructural integrity of the ceramic surface, thereby extending service life of ceramics.

[Problem] To provide a bismuth-ruthenium-oxygen type pyrochlore oxide powder in which the particle size distribution is controlled so as to be advantageous for improving dispersibility in a liquid medium and the intermingling of impurity phases is remarkably reduced. [Solution] A pyrochlore oxide powder that is a powder that has a crystal structure of a bismuth-ruthenium-oxygen type pyrochlore oxide and is composed of particles containing bismuth and ruthenium or containing bismuth, ruthenium, and manganese as metal elements, wherein the cumulative 50% particle diameter D50 in a volume-based particle size distribution determined using a laser diffraction scattering method is 3.0 μm or smaller, and a bismuth-containing phase different from the crystal structure of the pyrochlore oxide is not detected in an X-ray diffraction pattern.

The invention relates to the technical field of thermal barrier coating materials, in particular to an unequal-ratio Ce doped pyrochlore and fluorite double-phase high-entropy rare earth zirconate thermal barrier coating material and a preparation method thereof. The chemical composition formula of the thermal barrier coating material provided by the invention is (La < 0.2 > Ce < 0.1 > Sm < 0.1 > Dy < 0.2 > Yb < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >, (La < 0.2 > Sm < 0.2 > Yb < 0.2 > Sc < 0.2 > Y < 0.1 > Ce < 0.1 >) < 2 > Zr < 2 > O < 7 >, and (La < 0.2 > Ce < 0.1 > Nd < 0.1 > Yb < 0.2 > Lu < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >. The thermal expansion performance of the prepared coating material is obviously improved under the conditions that the low thermal conductivity, the high mechanical property and the high sintering resistance are met at the same time, and therefore the high-entropy rare earth zirconate thermal barrier coating material of the Ce-containing double-phase structure is promoted, and it is guaranteed that the material is practically applied to the field of thermal barrier coating materials.

A method for producing a pyrochlore-type oxide containing a plurality of cations including alkali metal cations in the components, the method comprising: a mixing step (S10, S20) in which a plurality of raw materials each containing a plurality of cations are mixed; and a heating step (S11, S21) in which a mixture containing a plurality of raw materials is heated by a liquid phase method at a predetermined temperature, thereby producing a composite oxide having a corundum structure, the composition of which contains at least an alkali metal cation.

The present application relates to the field of new materials, and aims to provide a preparation method of high-entropy pyrochlore type catalytic material with diatom shell morphology.The method comprises the following steps: immersing diatomite in a mixed solvent of triethanolamine and alcohol, adding a plurality of metal precursor solutions and L-lysine and ascorbic acid, uniformly mixing, then adding hydrogen peroxide and NaOH in sequence;after hydrothermal reaction, adding gluconic acid, and performing hydrothermal reaction again;burning the solid product to obtain the catalytic material.The present application adjusts the metal ion complexes in the precursor solution to make the dissociation degrees of the metal ions similar, so that the metal ions with large electronegativity difference have good cooperativity in the subsequent nucleation and crystallization process, thereby improving the uniformity of the final product and reducing the formation temperature of the pyrochlore phase;the formation temperature of the pyrochlore is reduced through secondary hydrothermal reconstruction crystallization;therefore, the present application can save the production cost of the catalytic material compared with the prior art.

The application discloses a kind of high oxygen storage cerium zirconium solid solution materials and preparation method, belong to rare earth catalytic material technical field, the method includes the following steps: precursor preparation, ultrasonic dispersion, double gradient precipitation, ultrasonic aging, solid-liquid separation, three-stage calcination and cooling with furnace.The application avoids coarse grain and uneven particle size distribution through the synergistic effect of double gradient precipitation and ultrasonic aging, so that the material is not easy to occur grain abnormal growth and structure collapse in long-term high temperature service.At the same time, the gradient calcination process controls the crystal densification and lattice reconstruction by steps, reduces the separation of fluorite phase and pyrochlore phase which is easy to occur in traditional low temperature single-stage calcination, maintains the stable crystal phase structure, ensures that the material can still retain sufficient active surface and pore structure under high temperature, thermal shock alternating working condition, significantly improves the oxygen storage capacity and long-term durability of catalyst carrier.

This application provides an integrated temperature-sensitive thermal barrier protection A2B2O7 ceramic material, its preparation method, and its application, which possesses A... 2‑ a The B2O7:aX material has a general structural formula and a crystal structure that is defective fluorite, pyrochlore, or a mixed two-phase structure. Doping with two or more types of luminescent ions allows for temperature measurement based on the fluorescence intensity ratio of non-thermally coupled energy levels, overcoming the limitations of relative sensitivity in traditional thermally coupled energy level temperature measurement. It utilizes the anti-thermal quenching or low-thermal quenching effects of the luminescent ions to extend the upper limit of temperature measurement, and the different temperature response characteristics of different luminescent ions enhance relative sensitivity. This material can be directly used to prepare a dual-function integrated coating for temperature sensing and thermal barrier protection, eliminating the difficulties of externally mounted sensors, avoiding damage to the coating integrity, and simplifying the complex layout of functional layers. It achieves the integration of thermal barrier protection and high-temperature sensing functions, providing a forward-looking solution for the safety assurance and condition monitoring of components operating in extreme high-temperature environments such as aero-engines and gas turbines.

The application discloses a thermal spraying flame heat recovery and recycling device based on emissivity regulation, and aims at solving the problems of serious flame heat dissipation, low energy utilization rate and insufficient melting of high melting point powder in the existing plasma thermal spraying process. The thermal spraying flame heat recovery and recycling device is provided with a heat recovery cover at the outlet end of a plasma thermal spraying device, the heat recovery cover is a high-temperature-resistant shell, the high-temperature-resistant shell is internally provided with a hollow cavity, the hollow cavity forms a vacuum heat insulation interlayer, the inner surface of the cover of the high-temperature-resistant shell is provided with a high-emissivity coating, the high-emissivity coating is a perovskite coating, a spinel coating or a pyrochlore / defect fluorite coating, the outer surface of the cover of the high-temperature-resistant shell is provided with a low-emissivity coating, and the low-emissivity coating is a metal-doped ZnO coating. The thermal spraying flame heat recovery and recycling device can not only significantly improve the energy utilization rate of the thermal spraying flame, but also improve the coating quality and service protection performance.

A method for producing a solid electrolyte having a pyrochlore-type crystal structure containing alkali metals, lanthanides, at least one specific element from transition elements, group 13 elements, group 14 elements, or group 15 elements, and halogen elements, comprising a mixing step (S11, S14, S21) for mixing a plurality of raw materials for the solid electrolyte to produce a raw material mixture, and a firing step (S12, S15, S22) for heating and firing the raw material mixture at a predetermined temperature. The raw materials include alkali metal compounds, lanthanide compounds, and specific element compounds. When the specific surface area of ​​the alkali metal compound is S1, the specific surface area of ​​the specific element compound is S2, and the specific surface area of ​​the lanthanide compound is S3, the relationships S1 / S2≦50 and S3 / S2≧0.01 exist.

An object of the present invention is to provide an oxygen absorbing and releasing material and a manufacturing method thereof which improve oxygen absorbing and releasing capacity at low temperatures and ensure heat resistance. The oxygen absorbing and releasing material of the present invention contains ceria-zirconia-based composite oxide containing ceria (CeO2) and zirconia (ZrO2), the ceria-zirconia-based composite oxide containing praseodymium (Pr) or neodymium (Nd) as an additive element, at least a part of the ceria-zirconia-based composite oxide having at least one ordered phase of a kappa phase and a pyrochlore phase, 40% to 100% of primary particles having a particle diameter of 0.4 μm to 1.5 μm existing on a basis of the number of particles, an X-ray diffraction pattern being obtained by X-ray diffraction using CuKα after heating at a temperature condition of 1100°C for 5 hours in the atmosphere, an I(14 / 29) value calculated from the X-ray diffraction pattern being 0.015 or more, and an I(28 / 29) value being 0.08 or less.

This invention discloses a Ga-Mn dual-doped pyrochlore-type La₂Zr₂O₇ low-temperature ceramic electrolyte and a fuel cell. The low-temperature ceramic electrolyte has a single-phase pyrochlore structure and the chemical formula La. 2‑ x Ga x Zr 2‑x Mn x O 7‑δ Where 0.2≤x≤0.6; Ga is Ga 3+ The form replaces part of the La bit, Mn with Mn 2+ / Mn 3+ / Mn 4+ By substituting some Zr sites, co-doping induces oxygen vacancy enrichment and modulates local charge distribution, thereby promoting oxide ion transport. The optimized composition of this invention, La... 1.6 Ga 0.4 Zr 1.6 Mn 0.4 O 7‑δ The ionic conductivity reaches 0.28 S·cm at 550 °C. ‑1 The activation energy was reduced to 0.678 eV; a single cell constructed using this electrolyte achieved 1171 mW·cm⁻¹ at 550 °C. ‑2 The peak power density is reduced to 0.37 Ω; the present invention realizes rapid oxide ion transport of La2Zr2O7-based electrolyte under medium and low temperature conditions, which can be used in high-performance solid oxide fuel cells.

A component for use in a plasma processing chamber system is provided. A component body has a plasma facing surface. The plasma facing surface comprises a pyrochlore, comprising at least one of zirconium and hafnium and at least one of lanthanum (La), samarium (Sm), yttrium (Y), erbium (Er), cerium (Ce), gadolinium (Gd), ytterbium (Yb), and neodymium (Nd).

This method for producing a pyrochlore-type oxide is provided with: a mixing step (S30) in which a composite oxide containing at least cations other than alkali metal cations is mixed with an alkali metal compound containing alkali metal cations; and a firing step (S40) for generating a pyrochlore-type oxide by heating the mixture containing the composite oxide and the alkali metal compound at a predetermined temperature. When the composite oxide contains alkali metal cations, the composition ratio of the alkali metal cations in the composite oxide is smaller than the composition ratio of the alkali metal cations in the alkali metal compound. The mixture contains an alkali metal compound in excess of the stoichiometric ratio with respect to the pyrochlore-type oxide. In the firing step, the alkali metal compound is liquefied by heating at a predetermined temperature.

An yttrium-containing structure comprises: (a) a substrate layer comprising a metal alloy, a ceramic material, a ceramic composite, or a combination thereof; (b) a bond-coat layer disposed on the substrate layer, or on an optional interlayer that is on the substrate layer, wherein the bond-coat layer comprises yttrium and a noble metal selected from the group consisting of platinum, iridium, rhenium, ruthenium, rhodium, osmium, and / or palladium; (c) a thermally grown oxide layer disposed on the bond-coat layer, wherein the thermally grown oxide layer comprises yttrium oxide; and (d) optionally, a top-coat layer disposed on the thermally grown oxide layer, wherein the top-coat layer comprises a metal oxide, a metal pyrochlore, or a metal silicate. Yttrium may be replaced with lutetium, in which the bond-coat layer comprises lutetium and a noble metal (e.g., Pt or Ir). A mixture of yttrium and lutetium may also be employed.

A composition comprising a rare earth-doped zirconium / hafnium oxide is provided that has a defect-fluorite structure or a pyrochlore structure. The rare earth-doped zirconium / hafnium oxide has a formula: (Ln1aLn2aLn3aLn4aLn5b)2M2O7 where each of Ln1, Ln2, Ln3, Ln4, and Ln5 is a different rare earth element such that Ln1 and M have a first atomic radius ratio that is 1.35 to 1.45, Ln2 and M have a second atomic radius ratio that is 1.35 to 1.45, Ln3 and M have a third atomic radius ratio that is 1.46 to 1.78, and Ln4 and M have a fourth radius ratio that is 1.46 to 1.78; a is 0.2 or 0.25; b is 0.2 when a is 0.2, and b is 0 when a is 0.25; and M is Zr, Hf, or a mixture thereof. Methods of forming a coating that includes this composition, along with the resulting coated components, are also provided.

Provided is a method for manufacturing a pyrochlore-type solid electrolyte containing: a plurality of cations including metal cations; a halogen element; and a defect structure. The method includes: a mixing step (S16) for preparing a mixed starting material obtained by mixing a precursor of the solid electrolyte or a raw material of a precursor and a halogen-containing starting material containing a halogen element; and a firing step (S17) for firing the mixed starting material. In the firing step, the halogen element is volatilized from the solid electrolyte at a halogen volatilization rate Vout, and the halogen element is supplied into a firing atmosphere of the solid electrolyte at a halogen supply rate Vin. In the firing step, if Dp is the median particle diameter of the solid electrolyte, the mixed starting material is fired under an atmosphere having a relationship of Vin / (Vout x Dp) ≥ 0.015.

A method for producing a solid electrolyte that has a pyrochlore-type crystal structure and contains an alkali metal, a lanthanoid, at least one specific element selected from transition elements, group 13 elements, group 14 elements, and group 15 elements, and a halogen element, the method comprising: mixing steps (S11, S14, S21) for mixing a plurality of raw materials of the solid electrolyte to produce a raw material mixture; and firing steps (S12, S15, S22) for heating the raw material mixture at a prescribed temperature to fire the mixture. The raw materials include an alkali metal compound, a lanthanoid compound, and a specific element compound. When S1 is defined as the specific surface area of the alkali metal compound, S2 is defined as the specific surface area of the specific element compound, and S3 is defined as the specific surface area of the lanthanoid compound, the relationships S1 / S2 ≤ 50 and S3 / S2 ≥ 0.01 hold true.

The invention relates to an online curing method for dry post-treatment of radioactive fission products. According to the method, a molten salt method is adopted, a precipitator and a curing raw material are added, the rare earth fission product in the radioactive waste salt is converted into a pyrochlore curing body, and curing treatment of the fission product is directly achieved in the molten salt. By selecting the specific curing raw materials, the curing reaction can be carried out at low temperature, so that the problem of environmental pollution caused by high-temperature reaction is avoided, and the problem that waste salt cannot be recycled due to volatilization of fused salt caused by high temperature is avoided; in addition, the pyrochlore solidified body synthesized on the basis of the specific solidified raw materials also has excellent leaching resistance, and is beneficial to long-term safe disposal of radioactive wastes. According to the online curing method disclosed by the invention, the existing curing process flow is simplified, the environmental pollution is reduced, the resource utilization rate is improved, the cured body with excellent leaching resistance is prepared, and technical support is provided for industrial application of a spent fuel dry post-treatment technology.

The invention discloses a high-entropy rare earth cerate ceramic coating for shielding neutrons and X-rays and a preparation method of the high-entropy rare earth cerate ceramic coating, and belongs to the technical field of radiation protection materials. The general formula of the chemical composition of the coating is (Sm < 0.2 > Gd < 0.2 > Er < 0.2 > Tm < 0.2 > Yb < 0.2 >) 2Ce2O7, and the coating has an A2B2O7 type pyrochlore or defective fluorite structure. A site is formed by atomic-scale mixing of five rare earth elements including Sm, Gd, Er, Tm and Yb, the molar content of each element is 5%-35%, and neutron and X-ray shielding functions are synergistically exerted through high-entropy design; and B site is Ce element. The preparation method comprises the following steps: proportioning corresponding oxides in proportion, performing ball milling, performing high-temperature sintering to synthesize high-entropy ceramic powder, performing spray drying granulation, and performing deposition on the surface of a matrix treated by the NiCoCrAlY bonding layer by adopting an atmospheric plasma spraying technology to form the coating. Atomic-scale uniform distribution of multiple functional elements is achieved through high entropy, a shielding blind area of a traditional composite material is eliminated, and the coating has the advantages of efficient cooperative shielding, excellent anti-radiation stability and environment friendliness and is suitable for radiation protection in the fields of aerospace, nuclear energy, medical treatment and the like.

A solid electrolyte for a secondary battery includes a core phase having a particle shape and a shell phase covering at least a part of the core phase. The shell phase consists of one or more phases. A constituent material of the core phase includes a pyrochlore solid electrolyte represented by a composition formula of Aa2−αAb(1+α) / 3B2O7−βXβ, where Aa is an alkali metal, Ab is a lanthanoid, B is a cationic metal, and X is an anion that is substitutable with O. A constituent material of the shell phase includes a material having a chemical composition including Li and different from a chemical composition of the pyrochlore solid electrolyte, and having a melting point lower than a melting point of the pyrochlore solid electrolyte.

The present disclosure provides an oxygen storage / release material that has achieved both the improved oxygen storage / release capacity at low temperature and heat tolerance, which comprises a ceria-zirconia-based composite oxide, wherein the ceria-zirconia-based composite oxide further comprises praseodymium (Pr) or neodymium (Nd), and has, in at least a part thereof, at least one ordered phase of κ phase and a pyrochlore phase, a proportion of primary particles having particle diameters of 0.4 μm to 1.5 μm is 40% to 100% on a particle number basis, and, when heated for 5 hours in the air at 1,100° C., I(14 / 29) value is 0.015 or more and I(28 / 29) value is 0.08 or less. The present disclosure also relates to a method for producing such oxygen storage / release material.

The invention relates to a wide temperature range infrared radiation zirconate ceramic based on entropy driving, the average infrared emissivity of the zirconate ceramic in a wide temperature range of 25-1600 DEG C and at a wave band of 0.78-16 [mu] m is greater than 0.90, the chemical formula of the zirconate ceramic is A2 (Zr1-x Bx) 2O7, the A site is formed by combining five or more principal element metal elements according to an equal molar ratio, the metal elements are selected from La, Pr, Sm, Nd, Mg, Ca, Cr, Mn, Co, Cu, Fe and Ni, and the sum of the molar ratios of the metal elements is equal to 1. The combination of the A-site metal elements at least comprises La, Pr elements and a transition metal element; the element B is selected from one of Mn, Co, Cu, Fe and Ni, x is the molar percentage of the element B in the (B + Zr) site, and x is more than 0 and less than 0.5; the fluorite-pyrochlore alloy has a defective fluorite or pyrochlore structure, and the space group is Fm-3m or Fd-3m. Meanwhile, the invention also discloses a preparation method of the zirconate ceramic. The stability of the microstructure is driven through entropy, the performance decline is fundamentally inhibited, and the performance reliability and the long-term effect under the high-temperature thermal cycle condition are ensured.

Coating components having a layer with a composition comprising a rare earth-doped zirconium / hafnium oxide are provided. The rare earth-doped zirconium / hafnium oxide has a formula: (Ln1aLn2aLn3aLn4aLn5b)2M2O7 where each of Ln1, Ln2, Ln3, Ln4, and Ln5 is a different rare earth element such that Ln1 and M have a first atomic radius ratio that is 1.35 to 1.45, Ln2 and M have a second atomic radius ratio that is 1.35 to 1.45, Ln3 and M have a third atomic radius ratio that is 1.46 to 1.78, and Ln4 and M have a fourth radius ratio that is 1.46 to 1.78; a is 0.2 or 0.25; b is 0.2 when a is 0.2, and b is 0 when a is 0.25; and M is Zr, Hf, or a mixture thereof. Methods of forming a coating that includes this composition, along with the resulting coated components, are also provided.

The invention relates to a high-entropy oxide ceramic without rare earth cations at A site. The chemical general formula of the high-entropy oxide ceramic is A2B2O7, wherein the A site is a combination of at least five elements of Mg, Ca, Sr, Cr, Mn, Fe, Co, Ni, Cu and Zn, and the molar ratio of the elements is greater than 10%; b site is one of Zr and Ce; the high-entropy oxide ceramic has one of a defective fluorite structure, a pyrochlore structure and a monoclinic phase structure and belongs to a cubic crystal system or a monoclinic system, and a space group is one of Fm-3m, Fd-3m and C2 / m. Meanwhile, the invention also discloses a preparation method of the high-entropy oxide ceramic. Through unique crystal structure diversity and performance regulation and control possibility brought by non-rare earth element combination, the infrared emissivity of the obtained high-entropy ceramic at the normal temperature of 0.78-25 [mu] m broadband is larger than 0.92, the infrared emissivity at the high temperature of 800 DEG C of 1-5 [mu] m waveband is larger than 0.90, and the high-entropy ceramic has potential application in the field of infrared radiation.

The invention provides a maximum infrared active optical phonon frequency quantitative prediction method and model, and the model comprises the steps: 1, obtaining a lattice structure of a sample material, and deducing intrinsic physical parameters of the sample material based on the crystal structure as model input data; determining a chemical bond type mu and a proportionality coefficient F mu of the dominant highest-frequency infrared active optical phonon mode through space group symmetry analysis; 2, calculating through DFPT to obtain vDFPT of a to-be-detected sample material system, and determining conditional constants k0 and alpha of the to-be-detected sample material system through MCMC fitting; 3, outputting the highest infrared active optical phonon frequency through a formula; according to the method, the multi-chemical bond coupling effect, the bond valence and the lattice structure are fully considered, the influence of temperature and element doping is further considered in detail, the prediction precision is remarkably improved, and the method is suitable for infrared optical performance optimization, infrared cut-off absorption edge design and high-throughput screening of multi-element oxide systems such as perovskite, pyrochlore and spinel.

The invention discloses a preparation method of a calcium defect type pyrochlore ceramic solidified body, which comprises the following steps: adding raw materials CaCO3, CeO2 and TiO2 into absolute ethyl alcohol, carrying out wet grinding uniformly, then carrying out tabletting forming, high-temperature sintering, crushing and grinding, carrying out tabletting again, and continuing high-temperature sintering; and repeatedly grinding, tabletting and sintering for multiple times, taking out the sample after the last sintering, and placing the sample in the air for cooling, thereby obtaining the product. The pressure of 5 to 50 Mpa is adopted for tabletting, and the sintering temperature is 1000 to 1800 DEG C. According to the preparation method, by designing Ca defect components, generation of impure phases is reduced, and a crystalline phase is mainly a pyrochlore phase. In conclusion, the method can be used for treating actinide nuclides and rare earth nuclides in the high-radioactivity waste, and is a novel solidification method.

The invention relates to the technical field of thermal barrier coating materials, and discloses an anti-sintering pyrochlore and fluorite double-phase high-entropy rare earth zirconate thermal barrier coating material and a preparation method thereof. The chemical composition of the thermal barrier coating material is (La < 0.2 > Sm < 0.2 > Dy < 0.2 > Yb < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >, (La < 0.2 > Sm < 0.2 > Yb < 0.2 > Sc < 0.2 > Y < 0.2 >) < 2 > Zr < 2 > O < 7 >, and (La < 0.2 > Nd < 0.2 > Yb < 0.2 > Lu < 0.2 > Sc < 0.2 >) < 2 > Zr < 2 > O < 7 >. The preparation method comprises the following steps: S1, preparing a solution according to a molecular formula; s2, performing reverse coprecipitation on the solution obtained in the step S1 to prepare a material; and S3, pre-sintering the material obtained in the step S2, and sintering for the second time to obtain the high-entropy rare earth zirconate thermal barrier coating material. The grain size and the grain growth speed of the pyrochlore and fluorite double-phase high-entropy rare earth zirconate designed by adopting the method are obviously reduced, and the sintering resistance is better.

This invention discloses a fluorite-pyrochlore dual-phase high-entropy oxide ceramic powder and its preparation method, relating to the field of high-performance ceramic technology. The preparation process is as follows: (1) Weigh out ZrO2, HfO2, and Pr6O in equal atomic percentages. 11 (1) Place the La2O3 and Sm2O3 powders in a crucible and calcine them in a muffle furnace to remove moisture and impurities; (2) Calcine the ZrO2, HfO2, and Pr6O3 powders after calcination. 11 (2) Powders of La2O3 and Sm2O3 were ball-milled and mixed. After ball milling, the powders were dried and ground in a drying oven to obtain high-entropy ceramic oxide precursor powder. (3) The high-entropy ceramic oxide precursor powder was placed in a muffle furnace and heat-treated in an air atmosphere. After cooling and grinding, high-entropy oxide ceramic powder with a fluorite-pyrochlore dual-phase structure was obtained. The chemical formula of the dual-phase high-entropy ceramic powder material prepared by this invention is (Zr,Hf,Pr,La,Sm)O 2‑δ It has a fluorite-pyrochlore two-phase structure, with low thermal conductivity and high coefficient of thermal expansion, and good thermal conductivity.