30 results about "Salt ceramic" patented technology

The invention relates to the technical field of thermal barrier coatings for gas turbines or aero-engines, and particularly discloses an ultra-thick and strong-bonding double-ceramic-layer thermal barrier coating and a preparation method thereof.The thermal barrier coating is composed of an MCrAlY bonding layer, a YSZ ceramic layer bottom layer and a high-entropy rare earth zirconate ceramic layer surface layer; the MCrAlY bonding layer is prepared through atmospheric plasma or hypersonic flame spraying, YSZ and high-entropy rare earth zirconate spherical powder serve as spraying raw materials, and the thermal barrier coating is prepared through an axial powder feeding high-energy plasma spraying system. The thermal barrier coating has the characteristics of super thickness (the coating thickness is 600-1200 microns), high bonding strength (gt; 19 MPa) and the like.

This invention discloses high-entropy rare-earth silicate ceramic nanopowders, their preparation methods, and applications. The preparation method of the high-entropy rare-earth silicate ceramic nanopowders of this invention includes the following steps: 1) dissolving rare-earth oxide powder in an acid solution to prepare a rare-earth salt solution, then adding urea and silica powder and performing a gelation reaction to obtain a gel; 2) igniting the gel for combustion synthesis, grinding, and obtaining a precursor powder; 3) calcining the precursor powder to obtain the high-entropy rare-earth silicate ceramic nanopowders. The high-entropy rare-earth silicate ceramic nanopowders of this invention possess excellent characteristics such as fine particle size, uniform elemental distribution, large component space, and absence of impurities. Furthermore, its preparation method has advantages such as fast synthesis speed, simple equipment, simple and controllable process, and low industrialization cost, making it suitable for application in hot-end components of aerospace engines and possessing very broad application prospects.

The application relates to a high-entropy rare earth hafnate ceramic coating material and a preparation method thereof, and belongs to the technical field of high-entropy materials. The phase composition of the coating material is (Y 0.2 Yb 0.2 Ho 0.2 Er 0.2 Tm 0.2 )2Hf2O7, which is a single-phase defect fluorite structure; the raw material powder is fully and uniformly mixed through wet ball milling, and then the raw material powder mixture is alloyed through a solid-phase sintering process to prepare the single-phase coating material, wherein the high-entropy rare earth hafnate ceramic element is uniformly distributed, the thermophysical performance is excellent, the high-temperature phase is stable, the coating material has low thermal conductivity and high thermal expansion coefficient, and has a wide application scene in the field of key high-end equipment thermal protection coating.

The present application relates to a kind of high radiation resistance of control rod for stack entropy rare earth zirconate ceramic material and its preparation method and application, belong to nuclear reactor neutron absorption rod material technical field.The control rod ceramic material provided by the present application is prepared by using europium oxide, dysprosium oxide, thulium oxide and zirconium oxide as raw materials, according to certain proportion, after ball milling, calcination, green body forming and green body sintering process, and then processing to obtain the middle entropy rare earth zirconate ceramic material that can be applied to control rod.The rare earth zirconate ceramic material has excellent radiation resistance, large neutron absorption cross section and low reactivity value loss, and has high density, excellent thermal conductivity and low thermal expansion coefficient, and shows good application prospect in the field of control rod materials.

The application discloses high-entropy rare earth silicate ceramic nano powder and a preparation method and application thereof. The preparation method of the high-entropy rare earth silicate ceramic nano powder comprises the following steps: 1) dissolving rare earth oxide powder in an acid solution to prepare a rare earth salt solution; 2) mixing the rare earth salt solution and a sodium silicate solution, adding ammonia water to perform chemical co-precipitation, then performing standing and aging, and then taking the precipitate to perform drying to obtain a precursor powder; and 3) placing the precursor powder under the condition that the temperature is 1100 DEG C to 1200 DEG C to perform calcination. The high-entropy rare earth silicate ceramic nano powder has excellent characteristics such as small particle size, uniform element distribution, large component space and no impurity phase, and the preparation method has the advantages of low synthesis temperature, simple equipment, simple and controllable process, low industrialization cost and the like, is suitable for being used on a hot end part of an aerospace engine and has a very wide application prospect.

The present application relates to a kind of lithium-rich aluminates ceramic coating high-speed coating method, it is related to new energy materials field, by step 1, preparation liquid precursor;Step 2, the heating and delivery of liquid precursor;Step 3, laser-assisted chemical vapor deposition generates lithium-rich aluminates ceramic coating;Preparation obtains lithium-rich aluminates ceramic coating.The present application is prepared by the pretreatment of raw material precursor, increases laser and vacuum-assisted deposition, and prepares lithium-rich aluminates ceramic coating (single-phase Li5AlO4 film), and deposition rate reaches 6mm / h, is conducive to scale production.

The present application relates to a kind of passive radiation cooling multi-host element rare earth cerate ceramic material based on, the chemical formula of this multi-host element rare earth cerate ceramic material is A2Ce2O7, wherein A site is at least 2 kinds of elements in La, Pr, Gd, Lu, and the content of each element is between 25~50%;And have defect fluorite or pyrochlore structure, belong to the system of vertical crystal, Fm-3m space group or Fd-3m space group.The present application combines high infrared radiation performance and heat protection performance, obtains the rare earth cerate ceramic with passive radiation cooling heat dissipation performance, and by improving the infrared radiation performance of material surface, the infrared emissivity of 0.78~2.5 μm band is >0.90, the infrared emissivity of 2.5~16 μm band is >0.90, to maximize the heat radiation heat dissipation effect.The obtained multi-host element rare earth cerate ceramic material has potential application in the field of radiation heat management such as large energy equipment, aero-engine, gas turbine, electronic device, power station boiler.

This invention discloses a high-entropy rare-earth silicate ceramic powder and its preparation method. A flocculent precipitate is obtained through in-situ chemical co-precipitation via both forward titration (adding ammonium carbonate solution to a precursor solution) and reverse titration (adding the precursor solution to an ammonium carbonate solution). This precipitate is then repeatedly washed, dried, and calcined at high temperature to prepare a monoclinic high-entropy silicate powder. This invention arbitrarily selects five trivalent lanthanide rare-earth elements with different ionic radii and dissolves them into the high-entropy rare-earth silicate lattice, thereby significantly increasing the configurational entropy and lattice distortion of the sample, enhancing the phase structure stability, and resulting in a resonant frequency temperature coefficient closer to 0 ppm / ℃. The bulk sample of the high-entropy rare-earth silicate ceramic powder, after pressing and sintering, has a relative permittivity of 9.82~10.31, which meets the requirements for microwave dielectric ceramics in millimeter-scale communication.

The invention provides a Ba-doped rare earth chromate ceramic material with high infrared emissivity and a preparation method of the Ba-doped rare earth chromate ceramic material, and belongs to the technical field of thermal barrier coating ceramic materials. The chemical general formula of the Ba-doped rare earth chromate ceramic material with high infrared emissivity is RE1-xBaxCrO3, x is more than or equal to 0.01 and less than or equal to 0.1, and RE is one of La, Nd and Sm. The grain size of the Ba-doped rare earth chromate ceramic material with high infrared emissivity is 0.5-10 [mu] m, the porosity is 0-10%, and the average emissivity of the Ba-doped rare earth chromate ceramic material at the infrared band of 200-2000 nm is not lower than 90%. The preparation method is a solid-phase reaction method. The Ba-doped rare earth chromate ceramic material with high infrared emissivity prepared by the invention has flexible and adjustable infrared emissivity, and the infrared emissivity can be adjusted by changing the doping amount of the Ba element. A solid-phase reaction method adopted for preparing the Ba-doped rare earth chromate ceramic material with high infrared emissivity is low in raw material cost, simple in process and low in equipment requirement.

The application discloses a preparation method of a rare earth silicate ceramic, and particularly relates to the following steps: S1, mixing raw material powder of a rare earth microcrystalline glass block, wet ball milling to obtain a mixed slurry, drying the mixed slurry to obtain mixed powder, heating the mixed powder, and performing high-temperature holding treatment to obtain a rare earth microcrystalline glass block; S2, wet ball milling the rare earth microcrystalline glass block to obtain a slurry, drying the slurry, and sieving to obtain rare earth microcrystalline glass powder; S3, mixing the rare earth microcrystalline glass powder and rare earth oxides, wet ball milling to obtain a rare earth silicate ceramic slurry, drying the slurry, and pressing into a rare earth silicate ceramic block; and performing high-temperature holding treatment after heating to obtain a rare earth silicate ceramic. Compared with the prior art, the application firstly proposes to use rare earth oxides and rare earth microcrystalline glass to prepare the rare earth silicate ceramic, and provides a new idea for the preparation of the rare earth silicate ceramic and the conversion of the rare earth microcrystalline glass into a ceramic.

The invention relates to a light photovoltaic module backboard flame-retardant coating and a preparation method thereof. Raw materials of the coating comprise the following components: aliphatic polyurethane acrylate, a phosphoric acid modified methacrylic acid oligomer, an intumescent flame retardant, polysiloxane, polysilazane, methyl phenyl silicone resin, MQ resin, hollow titanium dioxide, hollow ceramic microspheres, a silicate ceramic agglutinant, a curing agent, an ultraviolet light absorber, a leveling wetting agent, an antioxidant and a solvent. The components of the flame-retardant coating form a plurality of synergistic effects such as expansion-ceramic synergy, phosphorus-silicon synergy and silicon-silicon synergy, so that the coating realizes efficient flame retardance, high carbonization residue, high heat insulation and excellent mechanical properties.

The application relates to the technical field of ceramic materials, in particular to a preparation method and application of a rare earth cerate high-entropy ceramic material; and a preparation method of a rare earth cerate ceramic material, which comprises the following steps: S1, adding mixed rare earth oxides into deionized water to obtain a mixed solution; S2, adding zirconium sulfate into deionized water to obtain a zirconium sulfate solution; S3, adding the zirconium sulfate solution into the mixed solution, and then adding tetrabutyl titanate to obtain a reaction solution; S4, adding citric acid and ethylene glycol into the reaction solution to obtain a sol solution, and evaporating to obtain a wet gel; and S5, drying and crushing the wet gel, and sintering to obtain a ceramic material. The ceramic material utilizes the synergistic effect of multiple elements, produces obvious lattice distortion effect, and realizes the balance between thermal expansion and stability through the combination of multiple rare earth elements, so that the ceramic material has low thermal conductivity and good high-temperature stability.

This invention discloses a non-equimolar ratio high-entropy rare-earth zirconate ceramic and its composition design and preparation method. Based on the CMAS corrosion response behavior of single rare-earth zirconate ceramics, rare-earth elements are classified into interface stabilizers for forming a dense interfacial reaction layer and crystal resists for enhancing lattice stability. The ratio of these two elements is then directionally controlled to design a non-equimolar ratio high-entropy rare-earth zirconate ceramic material, chemically represented as (RE1...). a RE2 b 2Zr₂O₇. During preparation, rare earth oxides and zirconium oxide powder are weighed according to stoichiometric ratios, and then sequentially ball-milled, calcined, granulated, cold-pressed, and sintered to obtain a dense ceramic material. This invention overcomes the blind spots of traditional equimolar ratio design. The non-equimolar ratio high-entropy rare earth zirconate ceramic material designed and prepared exhibits significantly better CMAS corrosion resistance than existing equimolar ratio high-entropy rare earth zirconate ceramic systems, and has broad application prospects in the field of thermal barrier coatings.

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.

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.

The application relates to the technical field of new materials, in particular to a preparation method and application of a rare earth molybdate ceramic material synthesized by a molten salt method. x MoO (3x+6) / 2 The application relates to the technical field of new materials, in particular to a preparation method and application of a rare earth molybdate ceramic material synthesized by a molten salt method. The method has the advantages of low reaction temperature, simple process, short synthesis time, low impurity residue, no pollution, low cost and the like, and can also synthesize a rare earth molybdate material doped with a luminescent rare earth ion; the luminescent performance of the material is further improved compared with that of a pure rare earth molybdate; and the material prepared by the method can be applied to the fields of environment-friendly dyes, ferroelectric materials, microwave ceramic materials, catalytic materials, luminescent materials or solid oxide fuel cells.

The application discloses a preparation method of a Nd-doped uncooled infrared detector and a nickelate ceramic for magnetic sensitivity, and relates to the technical field of functional ceramic preparation.The application comprises the following stages: solution preparation, wet gel process, dry gel process, calcination process, powder pressing process and secondary calcination process.The application uses a sol-gel method to prepare a series of nickelate ceramic target materials with high density, good crystallization quality, short preparation period and excellent performance, and the nickelate ceramic target materials have the application conditions of uncooled and low noise, the characteristics of high sensitivity and low room temperature resistivity without toxicity and pollution, and can be used as candidate materials of uncooled infrared detectors and magnetic sensitive devices with higher possibility of military and high-end devices.

The application discloses a kind of high flow oxide eutectic high-entropy ceramic powder and preparation method thereof, belong to ceramic material field.The application includes: (1) preparation multi-main element solid solution single-phase high-entropy rare earth aluminate ceramic powder;(2) preparation oxide eutectic high-entropy ceramic sample;(3) preparation oxide eutectic high-entropy ceramic powder.The application successfully prepares oxide eutectic high-entropy ceramic powder, utilizes the excellent flowability of the prepared oxide eutectic high-entropy ceramic powder, so that it maintains high flowability without agglomeration when used as raw material for laser additive manufacturing technology, thereby ensuring the uniformity and stability of the material sprayed by laser nozzle, ensuring the smooth progress of laser additive manufacturing processing.

The application discloses a high-entropy rare earth silicate ceramic powder and a preparation method and application thereof. The preparation method of the high-entropy rare earth silicate ceramic powder comprises the following steps: 1) mixing rare earth oxide powder, SiO2 powder, LiCl and KCl and grinding to obtain a mixed powder; and 2) calcining the mixed powder under the condition that the temperature is 700 DEG C to 900 DEG C, and then performing water washing and drying to obtain the high-entropy rare earth silicate ceramic powder. The high-entropy rare earth silicate ceramic powder has the excellent characteristics of high purity, small particle size, uniform element distribution and large component space, and the preparation method has the advantages of short preparation period, low synthesis temperature, small energy consumption and high efficiency, is suitable for being used on a hot end part of an aerospace engine and has a very wide application prospect.

This invention discloses a rare-earth zirconate ceramic fiber and its preparation method, belonging to the field of rare-earth zirconate ceramic fiber preparation technology. The invention involves thoroughly dissolving and uniformly mixing water, binder, zirconium salt, rare-earth salt, lower alcohol, and N,N-dimethylformamide to form a transparent precursor spinning solution, followed by air-blown spinning combined with thermotropic crystallization to prepare fibers. The rare-earth zirconate ceramic fibers of this invention have a diameter of 200–500 nm and possess a pyrochlore or defective fluorite-like structure. This structure contains certain microscopic defects, which effectively reduce the mean free path of phonons, thereby reducing the rate at which heat energy passes through the material and lowering the thermal conductivity. This allows the material to exhibit excellent thermal insulation performance in high-temperature applications, while also possessing a certain degree of elasticity.

The application belongs to the field of zirconate ceramic materials, and particularly relates to a rare earth zirconate ceramic and a preparation method thereof. 1‑x Yb x ) 2+y Zr 2‑y‑ z Hf z O 7‑0.5y , wherein 0

The invention discloses high-temperature crack-inhibiting corrosion-inhibiting composite ceramic powder for an environmental barrier coating. The composite ceramic powder takes nano MAX-phase ceramic powder and nano silicate ceramic powder as raw materials; the invention also discloses a preparation method of the composite ceramic powder. The preparation method comprises the following steps: step 1, mixing; step 2, mechanical ball milling; step 3, spray granulation; 4, high-temperature solid-phase sintering is conducted, the high-temperature crack-inhibiting corrosion-inhibiting composite ceramic powder for the environmental barrier coating is obtained, and the invention further discloses application of the composite ceramic powder to the environmental barrier coating. According to the invention, by introducing the nano MAX-phase ceramic powder, the problem that the silicate ceramic layer is easy to crack under a high-temperature condition, so that an environment corrosion medium permeates into the coating and the whole coating is peeled off and loses efficacy is solved, and the nano MAX-phase ceramic powder with a proper thermal expansion coefficient is adapted to the silicate ceramic surface layer; and the crack-inhibiting, seepage-proofing and corrosion-inhibiting capabilities of the environmental barrier coating under a high-temperature service condition are realized.

Disclosed are composite materials comprising a porous, carbonated, calcium silicate ceramic having a microstructure comprising interconnected open pores; where the calcium silicate surface defining the pores is partially or completely coated with an amorphous silica layer, and the silica coating comprises an overlayer of calcium carbonate crystals; where the silica coating and calcium carbonate overlayer form a network that interconnects throughout the ceramic microstructure, but do not completely occlude the pores. Also disclosed are methods of forming such composite materials.

This invention discloses a lithium-induced phase change tantalate ceramic material, its preparation method, and its applications. The material has the structural formula ZnTa₂O₆ and / or (Li₂O₆). 0.5 Zn 0.5 TaO3; the ZnTa2O6 is a tetragonal phase P42 / mnm structure, (Li 0.5 Zn 0.5 TaO3 has a trigonal R3c structure. This material is obtained by thoroughly mixing raw materials including ZnO, Ta2O5, and Li2CO3, placing them in a corundum crucible, and then sintering. This material uses ZnTa2O6 as a substrate and Li... + Under the influence of Li, by controlling Li + The addition of certain amounts of Li induces a phase transition within the ceramic material, allowing it to be used to prepare multifunctional piezoelectric ceramic materials, such as fluorescent materials. + With the increase of [unclear], the tantalate ceramic matrix in the fluorescent material gradually transforms from o-ZTO (cubic ZnTa₂O₆) to pure t-ZTO (tetragonal ZnTa₂O₆) and finally to pure LZTO (triclinic ZnTa₂O₆). 0.5 Zn 0.5 (TaO3), thereby significantly improving the internal quantum efficiency and luminescence thermal stability of fluorescent materials.

This invention discloses a method for preparing a desalination ceramic composite membrane, belonging to the field of separation membrane material technology. The method includes: preparing a polymer-containing sol solution, coating it onto the surface of a ceramic microfiltration support, and heat-treating it to form an ultrafiltration transition layer; preparing a desalination ultrathin layer sol solution containing a polymer and a crosslinking agent, adjusting the pH value, and coating it onto the surface of the ultrafiltration transition layer; and undergoing gelation, curing, and ultraviolet / electron beam irradiation post-treatment to obtain the desalination ceramic composite membrane. This invention employs a three-stage composite structure, combining polymer modification, crosslinking regulation, and irradiation post-treatment, to solve the technical problems of existing organic membranes being unable to withstand harsh operating conditions and traditional ceramic membranes being unable to efficiently desalinate. The prepared composite membrane has a desalination layer thickness of 10–1000 nm, a molecular weight cutoff of 50–1000 Da, an inorganic salt desalination rate of 10–99%, and a pure water flux of 0.2–20 LMH·bar. It can operate stably for a long time under harsh conditions such as high temperature, strong acid, and strong alkali. The process is simple, energy consumption is low, and it can be mass-produced. It is suitable for scenarios such as brackish water desalination and industrial wastewater treatment, and has significant application value.

The application discloses a 600 DEG C high-temperature-resistant water-based environment-friendly coating with a bottom surface integrated and capable of replacing Dacromet and a preparation method thereof, and relates to the technical field of coatings. The coating is prepared by compounding a zinc-aluminum-silicate ceramicized anti-corrosion heat-resistant component, a water-based inorganic-organic hybrid heat-resistant film-forming resin, high-temperature-resistant sheet-shaped shielding fillers and a chromium-free corrosion inhibitor. The zinc-aluminum-silicate component cooperates with a rare earth cerium salt and phytic acid to build a chromium-free passivation layer, and forms a ceramicized interface layer and a hydrophilic anchoring layer through boehmite sol, a silane coupling agent and a phosphate dispersant, so as to improve the powder stability, corrosion resistance and high-temperature performance. The sheet-shaped zinc powder, aluminum powder and silicate skeleton jointly build a dense shielding structure, cooperate with the hybrid heat-resistant resin and the sheet-shaped fillers, realize excellent adhesion, salt spray resistance and 600 DEG C high-temperature-resistant non-cracking performance, and the coating is water-based, environment-friendly, chromium-free and low in VOC, and can meet the long-term anti-corrosion and high-temperature protection requirements of metal components.

This invention belongs to the field of surface thermal protection coating technology, and relates to a thermal barrier / high emissivity dual ceramic coating with adjustable thickness and its preparation method. The coating has a multi-layered structure, comprising, from the inside out, a metal bonding layer, a thermal barrier ceramic layer, and a high emissivity layer. The metal bonding layer is a NiCrAlY alloy bonding layer or a CoNiCrAlY alloy bonding layer. The ceramic layer is a multi-principal rare earth zirconate (RE2Zr2O7, RE=La / Nd / Sm / Eu / Gd) ceramic layer with low thermal conductivity. The high emissivity layer is a Sr-doped lanthanum ferrite layer. The dual ceramic coating of this invention has a gradient structure design, which can effectively alleviate the thermal mismatch stress caused by the difference in thermal expansion coefficients between the materials in each layer. Combining the high emissivity material, the low thermal conductivity material, and the metal bonding layer can reduce the heat conduction of high-temperature airflow to the substrate while enhancing the thermal radiation of the coating surface, greatly reducing the thermal load on the substrate.

This invention provides a method for preparing high-density, high-entropy rare-earth hafnium salt ceramics by arc remelting, belonging to the technical field of special ceramics. According to the target chemical formula (Dy... a Ho b Er c Yb d Lu e The method involves preparing a mixture of HfO2 powder and specific elemental proportions, ensuring that the molar amount of hafnium in the added HfO2 powder is less than the total molar amount of hafnium required for the target chemical formula. After pre-sintering the mixed powder into a porous framework, the framework is vacuum arc-melted under a protective atmosphere using metallic hafnium as the arc igniter. The melting of the metallic hafnium replenishes the missing hafnium in the mixture, thus precisely achieving the target composition. Multiple ingot remeltings are followed by annealing in an oxygen-containing atmosphere to compensate for oxygen vacancies and stabilize the phase structure. This method, through non-equimolar proportions of rare earth elements at the A-site and control of the closed-loop composition of hafnium, combined with arc remelting and re-oxidation annealing, can efficiently prepare high-density, high-entropy rare earth hafnium salt ceramics with a stable defective fluorite structure. It exhibits significant advantages in thermal conductivity control and irradiation defect containment.

The application provides a method for preparing high-density high-entropy rare earth hafnate ceramics by electric arc remelting, and belongs to the technical field of special ceramics. a Ho b Er c Yb d Lu e )2Hf2O7 and a specific element proportion range is prepared, and the molar amount of hafnium in the added HfO2 powder is less than the total molar amount of hafnium required by the target chemical formula; after the mixed powder is pre-sintered into a porous framework, the framework is subjected to vacuum electric arc melting under a protective atmosphere with hafnium as an arc starting body, and the missing hafnium in the preparation is supplemented after the hafnium is melted, so that the target composition is accurately realized; after multiple ingot turning remelting, oxygen vacancy compensation and phase structure stabilization are realized through oxygen-containing atmosphere annealing. Through non-equal molar ratio of A-site rare earth elements and closed-loop composition control of hafnium, combined with electric arc remelting and reoxygenation annealing, the method can efficiently prepare high-density high-entropy rare earth hafnate ceramics with stable defect-fluorite structure, and has significant advantages in thermal conductivity control and accommodation of radiation defects.

The invention belongs to the technical field of thermal barrier coating materials, and particularly relates to a multi-ion doped rare earth hafnate ceramic material with high thermal radiation absorption performance under a selected wave band as well as a preparation method, a design method and application of the multi-ion doped rare earth hafnate ceramic material. The multi-ion doped rare earth hafnate ceramic material with excellent thermal radiation absorption performance in a wide temperature range is successfully prepared through a solid-phase sintering process. The design of the material is based on a crystal field theory, a multi-energy-level synergistic transition system is constructed by introducing various rare earth ions, and the absorption capacity of the material to infrared thermal radiation photons under an adjustable wave band is effectively enhanced. Doped ions form a specific energy level structure in hafnate crystal lattices, so that the electron transition probability and the free carrier concentration are remarkably improved, and the intrinsic photon absorption performance of the material in a high-temperature selectable wave band is synergistically improved.