36results about How to "Prevent structural collapse" patented technology

The invention belongs to the technical field of sodium ion batteries, and discloses a sodium ion battery non-aqueous electrolyte and a sodium ion battery. The non-aqueous electrolyte of the sodium-ion battery comprises a non-aqueous organic solvent, electrolyte sodium salt and an additive, wherein the additive comprises a conventional additive and an acid anhydride substance with a structure as shown in a formula (I) and / or a formula (II). The acid anhydride additives with the structures shown in the formula (I) and the formula (II) in the electrolyte can form passive films on a positive-negative electrode interface, metal ion dissolution is inhibited, negative electrode active sites are covered, structural collapse caused by dissolution of metal ions in a positive electrode material is effectively avoided, catalytic reduction reaction of a solvent on the negative electrode interface is avoided, and the service life of the electrolyte is prolonged. Therefore, the dynamic performance and thermodynamic performance of the sodium-ion battery are improved, and the cycle performance, high-temperature performance and calendar life of the sodium-ion battery are improved.

The invention relates to the technical field of thermal insulation coatings, and discloses a preparation process of a nanopore aerogel thermal insulation coating, which comprises the following steps: S1, preparing materials: 10-15 parts of modified silicon dioxide aerogel, 2-8 parts of deionized water, 3-6 parts of absolute ethyl alcohol, 8-12 parts of a catalyst, 5-7 parts of an n-hexane solvent, 2-6 parts of a dispersing agent and 2-4 parts of a defoaming agent. According to the preparation method, structural collapse of the silicon dioxide aerogel in the application process can be avoided, the heat insulation and heat preservation performance and mechanical performance of the aerogel heat insulation and heat preservation coating are remarkably improved, the heat insulation and heat preservation performance and mechanical performance of the aerogel heat insulation and heat preservation coating can be further improved, and the adhesion capacity of the coating is further improved.

The invention provides a ZSM-12 molecular sieve with a hollow structure and a preparation method thereof, the crystal form is a ZSM-12 molecular sieve structure, the ZSM-12 molecular sieve structure is characterized as a single crystal particle crystal with a hollow structure through a transmission electron microscope, the center part of the crystal is hollow, and the hollow structure is presented. The preparation method comprises the following steps: firstly, contacting a ZSM-12 molecular sieve with water vapor for treatment, then washing, separating and drying to obtain a material, uniformly mixing the material with inorganic alkali, an aluminum source, a silicon source and water for reaction, and finally washing, separating, drying and roasting to obtain the ZSM-12 molecular sieve. The invention provides a brand-new method for synthesizing the ZSM-12 molecular sieve with the hollow structure, the problem that the ZSM-12 molecular sieve with the hollow structure cannot be obtained by an existing method for synthesizing and preparing hollow zeolite in the field is solved, and the preparation method provided by the invention is simple in process route and suitable for large-scale industrial production.

The invention provides an anti-falling device of a steel net rack and the anti-falling steel net rack. The steel net rack comprises a supporting column and a net rack body, a steel net rack support is installed on the top of the supporting column, the net rack body comprises a support ball joint and a net rack rod piece connected with the support ball joint, and the net rack body is welded to the steel net rack support through the support ball joint. The column hoop piece is fixed on a column body at the top of the supporting column in a sleeving manner; the support ball joint box is arranged on the support ball joint in a sleeving mode, and meanwhile the support ball joint box is arranged on the multiple net rack rod pieces of the support ball joint in a sleeving mode; one end of the high-strength pull rope is fixedly connected with the column hoop piece, and the other end of the high-strength pull rope is fixedly connected with the support ball joint box; when the steel net rack support is separated from the supporting column, the high-strength pull rope pulls the net rack body through the support ball joint box to prevent the net rack body from falling. The risk that the steel grid frame falls to hurt people can be avoided, the structural safety of the steel grid frame structure under accidental factors is guaranteed, and personnel and property safety is guaranteed.

The invention provides a preparation method for compounding a HE-Fe3Se4 / Se heterojunction on Mxene as a high-performance sodium ion battery anode material. The preparation method specifically comprises the following steps: step 1, synthesizing a high-entropy Prussian blue composite MXene material; and 2, synthesizing the HE-Fe3Se4 / Se / MXene anode material by adopting the high-entropy Prussian blue composite MXene material.

The invention discloses a preparation method of a sodium ion battery layered positive electrode material synthesized based on an MOF high-entropy strategy, and belongs to the field of electrochemistry, the method comprises the following steps: preparing a precursor based on a metal-organic framework, the precursor comprising Ni-MOFs and Ni / Mn-MOFs; the precursor is mixed with Na2CO3, MnO2, CuO, Fe2O3, TiO2 and MgO, and a mixed precursor is obtained; and carrying out high-temperature calcination on the mixed precursor to obtain the sodium-ion battery layered positive electrode material. According to the invention, the problem of structural collapse of the MOF material in circulation is solved, and the electrochemical performance and structural stability of the material are enhanced.

This invention discloses a structured compression method that guarantees the fidelity of knowledge objects, comprising: writing the original memorized text into an independent read-only storage area; extracting typified knowledge objects and marking their evidence intervals in the original text; recording the precise character intervals of detected behavioral constraints and setting compression lock flags; calculating the irreplaceability score of each knowledge object, routing according to the score and knowledge type, and performing hierarchical differentiated compression; reconstructing the original text based on the read-only storage area and evidence intervals, performing decompression on the compressed knowledge objects, calculating the F1 score of the decompressed text and the original text, performing implication detection on the behavioral constraints, and reverting to the previous version if a preset threshold is not reached; in multi-round cascaded compression, forcibly passing through knowledge objects whose immutable markers are true. The structured compression method of this invention guarantees the complete preservation of behavioral constraints, verifiable fallback of facts, and no distortion of the program step structure.

The invention relates to the technical field of electrocatalysis, in particular to an oxygen / sulfur heterostructure oxygen evolution electrocatalyst and a preparation method and application thereof. Based on an in-situ oxidation strategy, a CuFeO layer is generated on the surface of CuFeS, and the CuFeS-coated CuFeO high-performance oxygen evolution electrocatalyst with a heterostructure is obtained. By constructing a sulfide-oxide heterojunction, a built-in electric field can be formed at an interface to promote charge separation and transfer, so that the electrocatalytic activity is remarkably improved. And on the other hand, the CuFeO layer on the outer layer serves as an armor, and the problem of oxidation of the surface of CuFeS is solved. The electro-catalytic performance and the long-term stability are obviously improved.

This invention discloses Ni2Fe(SO4) 0.5 (OH)6(H2O) 3.85 This paper discusses / NF catalysts, their preparation methods, and applications, belonging to the field of catalyst synthesis technology. Using large-size nickel foam as a substrate, Ni₂Fe(SO₄) is directly prepared through one-step in-situ microwave-driven growth. 0.5 (OH)6(H2O) 3.85 The nanosheet array eliminates the need for subsequent loading or additional processing, simplifying the process and enhancing the bond between the catalyst and the substrate. This catalyst exhibits excellent performance in hydrogen production via water electrolysis, particularly in seawater electrolysis.

This invention discloses a bulk acoustic wave (BAW) device and its fabrication method. The BAW device includes: a substrate with a first groove on one side; a blocking layer located on the sidewall of the first groove and covering the entire sidewall of the first groove; a support structure located within the first groove; and a piezoelectric stacked structure located on one side of the substrate, specifically on the side of the support structure furthest from the substrate. This invention solves the problems of insufficient mechanical stability, susceptibility to external stress, and poor heat dissipation of traditional BAW devices.

Provided is a thermal barrier for a secondary battery, the thermal barrier including: a metal housing having an internal space; the cooling thermal insulation material is arranged in the metal shell; a metal support accommodating the metal housing; and an encapsulation pocket surrounding the metal support, where the metal support includes a first plate and a second plate, and the metal housing is accommodated between the first plate and the second plate.

The invention relates to a lightweight anti-radiation nanometer heat insulation material and a preparation method thereof. The method comprises the following steps: preparing a nanometer oxide dispersion liquid; uniformly mixing the oxide dispersion liquid and an adsorbent through high-speed shear stirring and ultrasonic treatment to obtain a mixed solution; placing the solution in a closed container for high-temperature hydrothermal reaction to obtain a semi-solid gel block; fully mixing the semi-solid gel block, the hydrophobic silicon carbide nano powder, the chopped fibers and the glass powder, and mechanically stirring to form mixed slurry; then extrusion forming is conducted through a mold, the steps of aftertreatment, aging and drying are conducted, and finally the graded heat treatment process is conducted to prepare the light anti-radiation nanometer heat insulation material. According to the preparation method, the light anti-radiation nano thermal insulation material with good temperature resistance and low density can be obtained.

A preparation method of an A-site doped Prussian blue sodium ion battery positive electrode material belongs to the field of new energy batteries, and the specific scheme comprises the following steps: step 1, adding Prussian blue prepared by a traditional process into an A'solution, stirring for 5-20 hours, and filtering to obtain a Prussian blue solution A '; wherein the A'solution comprises one or a combination of more of alkaline earth metal ions, transition metal ions and main group metal ions; and 2, after stirring is finished, centrifuging, collecting Prussian blue, washing and carrying out vacuum drying to obtain the A-site doped Prussian blue sodium ion battery positive electrode material. The invention relates to a method for partially replacing A-site ions with metal ions A'through cation exchange in a liquid phase environment to achieve an A-site doping effect. In the charging and discharging process, the metal ion A'is not separated and can be used as a support column in a Prussian blue lattice channel, so that the structure collapse in the Na < + > deintercalation process is prevented, and the long cycle performance of the sodium ion battery is improved.

The invention relates to catalysis and heat insulation multifunctional aerogel and a preparation method thereof. The method comprises the following steps: preparing nano oxide dispersion liquid; uniformly mixing the oxide dispersion liquid and an adsorbent through high-speed shear stirring and ultrasonic treatment to obtain a mixed solution; placing the solution in a closed container for high-temperature hydrothermal reaction to obtain a semi-solid gel block; and fully mixing the semi-solid gel block, hydrophobic titanium dioxide (rutile) nano powder, chopped fibers and glass powder, and mechanically stirring to form a new semi-solid gel block. Pressing and forming through a mold, carrying out the steps of post-treatment, aging and drying, and finally carrying out a graded heat treatment process to prepare the multifunctional aerogel with catalysis and heat insulation functions. According to the preparation method, the multifunctional aerogel material with good temperature resistance, infrared radiation resistance and low density can be obtained.

The present application relates to the technical field of target material preparation, and provides a ceramic evaporation target material and a preparation method thereof and a photovoltaic cell, including: pre-pressing a mixed ceramic powder into a plurality of green bodies with different densities; stacking the green bodies in the order of decreasing density from the middle to the two ends to obtain a composite green body; subjecting the composite green body to a bidirectional pressing treatment to obtain a superimposed green body; and subjecting the superimposed green body to high-temperature sintering to obtain a ceramic target material. The present application stacks the green bodies in the order of decreasing density from the middle to the two ends, so that the density of the middle part of the composite green body is greater than that of the two ends, and compensates for the density difference caused by the pressure applied to the middle part of the composite green body due to the bidirectional pressing being smaller than that of the two ends, so that the density distribution of the superimposed green body is uniform, so that the ceramic evaporation target material has uniform density and good thermal conductivity. Moreover, the target green body connection surface formed by the superposition of multiple green bodies can block the longitudinal transmission of target material cracks and prevent heat from being transmitted longitudinally to the center of the target material during the coating process, thereby preventing the target material structure from collapsing or powder splashing.

The invention discloses high-reliability solid propellant 3D printing curing equipment. The high-reliability solid propellant 3D printing curing equipment comprises a solid propellant 3D printing nozzle structure, an ultraviolet lamp and a printing platform; the high-reliability solid propellant 3D printing nozzle structure comprises a plunger, a charging barrel, a rubber sealing gasket, a nozzle and a nozzle light shield. When solid propellant printing is carried out, the plunger extrudes solid propellant slurry in the charging barrel to be extruded out of the nozzle, the photocuring equipment irradiates the printed slurry to carry out photocuring shaping, and the light shield is installed at the joint of the nozzle, so that the solid propellant is prevented from being cured near a discharging hole of the nozzle to form blockage. The method is wide in application scene, and the solid propellant can be uniformly, efficiently and stably cured and formed.

The present application relates to the technical field of thermal insulation coating, and proposes a nano-porous aerogel thermal insulation coating and a preparation method thereof, and a raw material of the nano-porous aerogel thermal insulation coating, which comprises the following components in parts by weight: modified silica aerogel 10-25 parts, epoxy acrylate resin 40-55 parts, sodium polyacrylate 5-8 parts, dispersing agent 1-1.5 parts, and defoaming agent 0.5-1 part; the modified silica aerogel is boron oxide modified silica aerogel. Through the above technical solution, the problem of poor thermal insulation performance and mechanical properties of the aerogel thermal insulation coating in the prior art is solved.

The application discloses a perovskite solar cell based on inhibition of boundary layer defects and a preparation method thereof, and belongs to the technical field of perovskite solar cells. The disclosed method comprises the following steps: S1, sequentially preparing a hole transport layer and a perovskite light absorption layer on a conductive substrate; then applying a boundary layer repair solution to the surface of the perovskite light absorption layer to form a boundary layer repair wet film; the boundary layer repair solution is obtained by dissolving 5-chloro tryptamine hydrochloride in a solvent; S2, annealing the boundary layer repair wet film to make 5-chloro tryptamine hydrochloride chemically react with the perovskite surface interface, thereby forming a boundary modification layer at the surface interface of the perovskite light absorption layer; and S3, sequentially preparing an electron transport layer and a back electrode to obtain the perovskite solar cell based on inhibition of boundary layer defects. The technical problem that the existing method is difficult to fundamentally inhibit the boundary layer defects and improve the long-term stability of the perovskite solar cell is solved.

The invention relates to magnetic and heat-insulating multifunctional aerogel and a preparation method thereof. The method comprises the following steps: preparing nano oxide dispersion liquid; uniformly mixing the oxide dispersion liquid and an adsorbent through high-speed shear stirring and ultrasonic treatment to obtain a mixed solution; placing the solution in a closed container for high-temperature hydrothermal reaction to obtain a semi-solid gel block; fully mixing the semi-solid gel block, the hydrophobic magnetic nano powder, the chopped fibers and the glass powder, and mechanically stirring to form a new semi-solid gel block. And then carrying out compression molding through a mold, carrying out post-treatment, aging and drying steps, and finally carrying out a graded heat treatment process to prepare the magnetic and heat-insulating multifunctional aerogel. According to the preparation method, the magnetic multifunctional nanowire aerogel material with good temperature resistance, infrared radiation resistance and low density can be obtained.

The invention relates to the technical field of catalyst preparation, in particular to a preparation method of an In2O3-based finger-shaped photocatalyst, which comprises the following steps: step 1, adding a certain amount of indium source and terephthalic acid into a reactor, then adding N, N-dimethylformamide (DMF), and stirring to completely dissolve the solid to obtain a solution A; 2, the solution A obtained in the step 1 is placed in an oil bath pan for oil bath heating, after the reaction is finished, cooling, filtering, washing and drying are conducted, and solid powder can be obtained; compared with the prior art, the preparation method has the advantages that a solvothermal synthesis technology is utilized, the microstructure of In2O3 is finely regulated and controlled, a unique finger appearance is formed, then iridium monatomic is accurately supported through a wet chemical method, and the density and electron transfer efficiency of photocatalytic active sites are remarkably improved. The obtained catalyst shows excellent gamma-lactam photocatalytic conversion capability under visible light irradiation, and the conversion rate is up to 95% or above.

The application belongs to the technical field of electrocatalytic material preparation, and discloses a method for preparing a cobalt tungstate electrode based on gas-phase replacement, an electrode and application. 3 A seed layer is formed on the surface of the conductive substrate; then the conductive substrate is placed in a hydrothermal reaction solution containing tungstate, and a hydrothermal reaction is performed; after cleaning and drying, annealing treatment is performed, so that a WO3 nanosheet array is obtained on the conductive substrate; then the conductive substrate and a volatile cobalt source are placed in a protective atmosphere and under negative pressure to perform a gas-phase cation replacement reaction, so that a cobalt tungstate multistage nanostructure electrode is obtained. The application utilizes the characteristics of gas-phase reaction, and on the basis of inheriting the two-dimensional array structure of the precursor, a hierarchical rough morphology is constructed in situ; the prepared cobalt tungstate multistage nanostructure electrode exhibits excellent catalytic activity in the electrocatalytic oxygen evolution reaction in an alkaline medium, the process is simple and the parameters are controllable, and the application has good application prospect.

The application relates to a polyionic liquid binder suitable for vulcanized polyacrylonitrile and a preparation method and application thereof, which is obtained by carrying out an alkylation reaction and a polymerization reaction on bromo-n-butane and 1-vinylimidazole, and then carrying out an anion exchange reaction on lithium bis(trifluoromethylsulfonyl) imide and sodium anthraquinone-2-sulfonate. The polyionic liquid binder can anchor polysulfide on the polymer chain through the electrostatic interaction between the lone pair electrons in the molecular chain and the polysulfide, effectively inhibits the shuttle effect, contains a quinoid structure which can act as a redox medium to accelerate the electron transfer process and improve the interface kinetic performance of the SPAN positive electrode, has excellent bonding performance and mechanical strength, can significantly improve the structural integrity and electronic conduction continuity of the electrode in the cycle process, and prolongs the cycle life of the electrode. The obtained binder can be widely applied to SPAN-based positive electrodes of lithium ion batteries and provides effective technical support for solving key problems such as volume expansion and poor conductivity of SPAN materials.

The invention discloses a gradient in-situ doped gradient lithium-rich positive electrode material and a preparation method, and relates to the field of lithium ion battery positive electrode materials. The general formula is xLi2MnO3. 1-xLi (TM, M) O2, where 0 lt; xlt; tM is one or two of Mn and Ni, and TM at least comprises Ni; the internal Mn concentration is reduced in a gradient mode from the center to the surface layer, and the Ni concentration is increased in a gradient mode from the center to the surface layer. The material comprises a doping element M, the doping element M is selected from at least one of Al, Mg, Ti, Nb, Ta, Mo, W, Zr and Co, and the ratio of the molar weight of the doping element M to the total molar weight of Ni and Mn ranges from 1: 2000 to 1: 100; and spatial distribution: the distribution of the doping element M in the particles is changed in a positive or / and negative gradient manner. And the charge transfer impedance is reduced and the diffusion rate of lithium ions is improved due to the nickel-rich surface layer and gradient-change doping distribution.

The invention belongs to the technical field of sodium-ion batteries, and discloses a sodium-ion battery non-aqueous electrolyte containing sodium sulfonate and a sodium-ion battery. The non-aqueous electrolyte of the sodium-ion battery comprises a non-aqueous organic solvent, electrolyte sodium salt and additives, wherein the additives comprise a conventional additive and a sodium sulfonate additive with a structure as shown in a formula (I); in the imgabs0 #, R is selected from alkyl, alkenyl, alkynyl and halides thereof, aromatic hydrocarbon, fluoroalkyl, trimethylsilyl, ethyoxyl, cyano and sodium ions. According to the electrolyte, the sodium sulfonate additive with the structure shown in the formula (I) and other additives act together, so that the dynamic performance and thermodynamic performance of the sodium-ion battery are better improved, the cycle performance and high-temperature performance of the sodium-ion battery are improved, and the calendar life of the sodium-ion battery is prolonged.

The application provides an organ chip multilayer cell tissue structure, which comprises an upper layer of a multilayer structure, a middle layer of the multilayer structure and a lower layer of the multilayer structure; the middle layer of the multilayer structure is a self-supporting biological hydrogel support without a supporting film, and cells in the middle layer of the multilayer structure are mixed in the biological hydrogel support; the upper layer of the multilayer structure and the lower layer of the multilayer structure respectively culture different cells and directly contact upper and lower surfaces of the biological hydrogel support. The application truly reproduces a sandwich type multilayer structure of "cell-matrix-cell", avoids problems such as incomplete establishment of cell polarity, imperfect barrier function and distorted signal transmission between cells, and the like; the multilayer cell tissue structure cultured by using the biological hydrogel support avoids interlayer peeling between different layers and structure collapse; and the permeability of the middle layer matrix is convenient to adjust.

The invention discloses a sodium ion battery composite negative electrode material which is formed by compounding a soft carbon material and a hard carbon material according to a certain proportion, a precursor of the soft carbon material is an organic matter which is high in phenolic resin carbon content and easy to carbonize, a precursor of the hard carbon material is a high-molecular polymer, the high-molecular polymer is polyacrylonitrile, and the high-molecular polymer is silicon dioxide. The invention relates to the technical field of electrochemical energy storage. According to the sodium ion battery composite negative electrode material and the battery, the soft carbon material has relatively large carbon layer size and relatively wide interlayer spacing and shows excellent conductivity, the hard carbon material has a compact carbon layer structure and stable chemical properties and is excellent in cycle performance, and by adjusting the ratio of the soft carbon to the hard carbon, the cycle performance of the sodium ion battery is improved. The comprehensive performance of the composite material can be optimized, the conductivity of the composite material is remarkably improved by adding the soft carbon material, rapid transmission of electrons in the negative electrode material is promoted, and the stable structure of the hard carbon material provides good support for the composite material.

This invention relates to the field of catalyst technology, specifically to a method for preparing and applying a modified metal sulfide catalyst for the co-conversion of acidic natural gas. The preparation method includes: S1. Dissolving ammonium molybdate tetrahydrate in a modified solvent and stirring until completely dissolved to obtain a transparent and homogeneous solution; S2. Adding 2-3 parts of a modified support precursor to the solution and transferring it to an autoclave for reaction for 22-24 hours; S3. Centrifuging the solution and washing the precipitate 2-3 times with deionized water and anhydrous ethanol, respectively, followed by drying and grinding to obtain the modified metal sulfide catalyst. This invention utilizes concentrated light technology to synergistically apply light and heat energy to the reaction system, achieving high-efficiency conversion at a lower temperature (450-550℃) and atmospheric pressure compared to traditional thermocatalysis, significantly reducing energy consumption. It is the first catalyst designed for CH4. 4 and H 2 A metal sulfide composite catalyst system for S-concentrated photocatalytic co-conversion converts two harmful / low-value gases into high-value CS in one step. 2 and clean H 2 This has enabled "waste treatment" and resource recycling.

The invention discloses an anti-static wafer PVCWafer protective film and a preparation method thereof, and belongs to the technical field of PVC thin films, hydroxyl on a polyborosiloxane molecular chain and silicon hydroxyl on the surface of modified nickel composite hollow carbon fiber are condensed, polyborosiloxane / hollow carbon fiber is used as rigid filler and can be uniformly dispersed in a polyvinyl chloride matrix, and the reason is that the rigid filler can be uniformly dispersed in the polyvinyl chloride matrix, so that the anti-static wafer PVCWafer protective film is prepared. Polyborosiloxane molecules contain a large number of silicon-oxygen bonds and boron-oxygen bonds, the groups have high polarity, compatibility with polyvinyl chloride can be improved, organosiloxane chain segments of polyborosiloxane have certain flexibility, the organosiloxane chain segments can serve as flexible buffer layers, rigidity difference between polyborosiloxane / hollow carbon fibers and polyvinyl chloride is relieved, and therefore the service life of the hollow carbon fibers is prolonged. The interface stress concentration is reduced, and the compatibility of the two is further improved.

The invention belongs to the technical field of sodium ion batteries, and discloses a sodium sulfate salt-containing sodium ion battery non-aqueous electrolyte and a sodium ion battery. The sodium-sulfate-salt-containing sodium ion battery non-aqueous electrolyte comprises a non-aqueous organic solvent, an electrolyte sodium salt and an additive, wherein the additive comprises a conventional additive and a sodium sulfate salt additive with a structure as shown in a formula (I). The sodium sulfate additive in the electrolyte can form a passive film on a positive and negative electrode interface, inhibit dissolution of metal ions, cover negative electrode active sites, effectively avoid structure collapse caused by dissolution of the metal ions in a positive electrode material, avoid catalytic reduction reaction of a solvent on the negative electrode interface, and improve the service life of the electrolyte. Therefore, the dynamic performance and thermodynamic performance of the sodium-ion battery are better improved, and the cycle performance, high-temperature performance and calendar life of the sodium-ion battery are improved.

The invention relates to the technical field of target material preparation, and provides a ceramic evaporation target material, a preparation method thereof and a photovoltaic cell, and the preparation method comprises the following steps: pre-pressing mixed ceramic powder into a plurality of green bodies with different densities; the blanks are stacked according to the sequence that the density is decreased progressively from the middle to the two ends, and a composite blank is obtained; carrying out two-way pressing treatment on the composite green body to obtain a laminated biscuit; and carrying out high-temperature sintering on the laminated biscuit to obtain the ceramic target material. The blanks are stacked according to the sequence that the densities are gradually reduced from the middle to the two ends, so that the density of the middle part of the composite blank is larger than that of the two ends, the density difference caused by the fact that the pressure applied to the middle part of the composite blank is smaller than that of the two ends in bidirectional pressing is compensated, and the density distribution of the stacked biscuits is uniform; therefore, the ceramic evaporation target material is uniform in density and good in heat conduction performance. And a target blank connecting surface formed by laminating a plurality of blank bodies can block the longitudinal transfer of cracks of the target material and prevent the longitudinal transfer of heat to the center of the target material in the coating process, so that the collapse of the target material structure or the splashing of powder is prevented.