889 results about "Ceramic particle" patented technology

An electrode structure for a solid-state or semi-solid-state battery is provided in which NCM electrode particles coated with an interphase layer and a nitrogen-containing carbon layer are disposed. [Solution] The NCM electrode particles comprise NCM (nickel-cobalt-manganese oxide) particles (15), primary particles (30) that coat the outer surfaces of the NCM particles, an interphase layer (16) that includes a glass phase layer (241) and a plurality of ceramic particles (242), and a nitrogen-containing carbon layer (35) that coats the exterior of the primary particles. Nitrogen-doped carbon molecules in the nitrogen-containing carbon layer aid in the conduction of electrons and lithium ions, modifying the electrical potential of the NCM particles. The nitrogen-containing carbon layer is formed by coating the surfaces of the primary particles with a nitrogen-containing polymer material and calcining the material in an inert atmosphere. Conjugated bonds are formed between the carbon and nitrogen, modifying the energy band structure, reducing the energy required for electrons to transition to the conduction band, and improving overall electronic conductivity.

The invention discloses a regulation and control method and a preparation method of in-situ ceramic particles of a copper-based composite material. The method comprises the following steps: weighing according to a reaction equation and a reaction molar ratio; the molar ratio coefficient is changed, trace alloy is added, and the size and morphology of in-situ particles are regulated and controlled; the copper-based pre-dispersed in-situ ceramic intermediate alloy reinforcer is prepared through powder mixing, cold pressing and sintering; crushing the reinforcer, remelting, stirring and casting; and after the cast alloy is subjected to heat treatment, the high-performance in-situ particle reinforced copper-based composite material is prepared. According to the obtained in-situ ceramic intermediate alloy reinforcer, pre-dispersion of ceramic particles in a copper matrix can be achieved, and good combination of the particles and the matrix is achieved by adding the copper-based pre-dispersion in-situ ceramic intermediate alloy reinforcer into a molten matrix alloy; interface pores caused by sharp corners, surface pollution and the like of the heterogeneous particles in an external addition method are avoided, and the strengthening effect of the heterogeneous particles is weakened.

The invention discloses a high-content fly ash unfired water permeable brick and a preparation method thereof, and relates to the technical field of building materials, the unfired water permeable brick comprises the following raw materials by weight: 55-75 parts of fly ash, 20-35 parts of aggregate, 8-15 parts of a composite cementing material, 0.5-2 parts of toughening fiber, 1-3 parts of a pore regulator, 0.1-0.5 part of a surfactant, and 10-18 parts of water. Wherein the aggregate is 1-3mm waste ceramic particles and 2-5mm building recycled aggregate (1: 1-1: 2); and the rest components have specific proportions, specifications and modification requirements. According to the invention, 55-75 parts of F-type II-grade or higher high-content fly ash is matched with the waste ceramic particles and the pretreated building recycled aggregate to serve as the composite aggregate, solid waste is digested, natural resource dependence is reduced, and the method conforms to the direction of green building materials; by means of a modified composite fiber and composite gel system, the pressure resistance is larger than or equal to 25 MPa, the fracture resistance is larger than or equal to 3.5 MPa, the water permeability is larger than or equal to 1.5 * 10 cm / s, the freeze-thaw loss is smaller than or equal to 3.5%, and the grinding pit is smaller than or equal to 30 mm; through graded mixing, bidirectional pressurization and segmented maintenance, the porosity is kept to be 15%-25%, the percent of pass is increased, and the cost is reduced.

The invention discloses an underground mine goaf filling body strengthening and subsequent mining joining method, and relates to the technical field of mine mining. Comprising the following steps of intelligent filling body construction and reinforcement, multi-source fusion intelligent monitoring and digital twinning construction, data-driven subsequent mining dynamic intelligent decision making and energy regulation and control, targeted restoration and collaborative ecological reconstruction. The intelligent filling body is made of the shape memory polymer fibers and the nanometer piezoelectric ceramic particles, the layering process is combined to improve the strength and real-time state feedback, the safety and durability of the filling body are remarkably improved, the high-fidelity digital twinborn model is constructed in a fused mode, intelligent decision making and active wave absorbing regulation are linked, and the stability of the filling body is improved. The subsequent mining efficiency can be effectively improved, the damage risk of the filling body can be effectively reduced, in addition, the damage area is accurately positioned through the unmanned aerial vehicle, directional grouting repair is conducted, heavy metal is solidified through microorganisms, solid waste is recycled, the resource utilization rate in the mining process is increased, and the environmental burden is reduced.

The invention relates to the technical field of nuclear fusion surface plasma W materials, in particular to nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder, a composite material and a preparation method of the nano rare earth oxide ceramic-Ti microalloy composite reinforced W powder. The composite powder is of a nearly spherical core-shell hierarchical structure, and the particle size is 30-50 nm; according to the composite powder, refractory metal W serves as a matrix, nano rare earth oxide ceramic particles are evenly dispersed in matrix W crystal grains, Ti mainly forms an enrichment area on the surface of the matrix or a matrix / rare earth oxide interface in a simple substance or oxide mode, the phase interface structure is effectively improved, W crystal boundary migration and dislocation motion are hindered, W crystal grains are remarkably refined, and the composite powder is prepared. Part and W form semi-coherence, fine grain and interface strengthening and toughening are achieved, and a brand new thought and a technical method are provided for synergistically improving the strength and toughness of the W composite material. The composite powder is subjected to organic reduction synthesis and low-temperature reinforced sintering to prepare the composite material, the tensile strength at the room temperature reaches 500-610 MPa, and the ductility is 5%-8%.

The invention relates to a composite diaphragm, a preparation method thereof and a battery. The composite diaphragm comprises a base membrane, a first functional layer arranged on at least one side surface of the base membrane in the thickness direction, and a second functional layer arranged on one side surface, far away from the base membrane, of the first functional layer, the first functional layer comprises ceramic particles and a high-temperature-resistant polymer; the thermal decomposition temperature of the high-temperature-resistant polymer is higher than that of the base membrane and lower than the melting point of the ceramic particles; the second functional layer comprises a functional additive, and the functional additive comprises a polyether polymer; the contact angle between the second functional layer and the electrolyte is smaller than or equal to 50 degrees. Therefore, through the synergistic effect of the first functional layer and the second functional layer, the thermal stability of the composite diaphragm and the wettability of the composite diaphragm to electrolyte are improved at the same time.

The invention belongs to the technical field of battery manufacturing, and particularly discloses a diaphragm with a gradient structure and a preparation method of the diaphragm. The diaphragm with the gradient structure comprises a diaphragm base membrane and a coating layer, the coating layer comprises ceramic coatings with different particle size ranges, and the two faces of the diaphragm base membrane are coated with ceramic particles A with the particle size D50 smaller than or equal to 100 nm and ceramic particles B with the particle size of 200-400 nm respectively. According to the diaphragm with the gradient structure, the porosity on the side close to the positive electrode is small, the porosity on the side close to the negative electrode is large, and therefore a smoother lithium ion transmission channel can be formed on the negative electrode side of the diaphragm, and the requirement for high lithium ion flux is met.

The invention relates to the technical field of lithium battery diaphragms, and provides ceramic affinity type lithium battery diaphragm organic coating slurry and a preparation method and application thereof.The ceramic affinity type lithium battery diaphragm organic coating slurry is prepared from, by weight, 10-12 parts of deionized water, 1-3 parts of ceramic microcapsule particles, 0.1-0.3 part of hydroxymethyl cellulose lithium and 0.5-1 part of solid electrolyte; core materials of the ceramic microcapsule particles are ceramic particles, and wall materials of the ceramic microcapsule particles are organic polymers; the preparation method of the ceramic microcapsule particles comprises the following steps: S1, dispersing deionized water, ceramic particles and a dispersing agent, uniformly stirring, introducing nitrogen, sequentially adding a lithium salt, a coating agent and a pore forming agent, then adding PVDF powder and PMMA powder, and mixing to obtain a pre-agglomerated solution; and S2, carrying out spray drying granulation on the pre-agglomerated liquid to obtain the ceramic microcapsule particles. According to the technical scheme, the problems of insufficient heat resistance and safety of the lithium battery diaphragm in related technologies are solved.

The invention relates to the technical field of wood, in particular to a multilayer structure insulation laminated wood manufacturing process which comprises the following steps: pretreatment: selecting birch fiber sheets with the thickness of 0.2-0.4 mm, and degreasing, cleaning and drying the birch fiber sheets; flame retardant treatment, wherein the surfaces of the pretreated birch fiber sheets are coated with a flame retardant solvent for 1-3 times through spraying equipment; and preparing impregnation liquid. According to the invention, epoxy resin is further crosslinked with residual hydroxyl of isocyanate resin through ring-opening reaction of epoxy groups to form a three-dimensional interpenetrating network structure, pores of wood fibers are effectively sealed, and an internal ion migration path is blocked, so that the insulativity is improved; meanwhile, the surface activity of the ceramic particles in the functional additive is enhanced after plasma treatment, stronger interface bonding is formed between the ceramic particles and the resin matrix, microcracks and holes at the interface are reduced, the breakdown risk caused by local electric field concentration is avoided, and the insulation effect is enhanced.

The invention provides an online monitoring and early warning method for the wear state of a steel-based ceramic lining plate, and the method aims at the steel-based ceramic lining plate formed by compounding a metal matrix and inlaid ceramic particles, and comprises the steps: collecting multi-source monitoring signals which at least comprise a distance signal, an acoustic emission signal and equipment operation condition parameters; based on the multi-source monitoring signals, processing is carried out through a wear analysis model embedded with physical constraints, so that a decoupling evaluation result is output; the physical constraint is used for representing the coupling relationship between the wear state of the metal matrix and the protection effect of the ceramic particles; based on the evaluation result, predicting the evolution trend of the biphase wear coupling of the lining plate, and identifying the chain failure risk that the wear acceleration of the metal matrix is triggered by the failure of the ceramic particles; and integrating the grade and the evolution trend of the linkage failure risk to obtain a graded early warning signal, and generating a maintenance decision suggestion. According to the method provided by the invention, biphase wear is evaluated through real-time online decoupling, linkage risks are predicted, and graded early warning is realized.

The invention provides a gradient nano composite high-entropy alloy coating system with a self-monitoring function and a preparation method, and relates to the technical field of material surface engineering.The system comprises a functional gradient coating module used for achieving gradient dispersion distribution of nano ceramic particles on the curved surface of a shield hob so as to form a gradient nano composite high-entropy alloy coating; the fiber bragg grating sensing module is used for collecting strain data of the shield hob through a fiber bragg grating sensor integrated on the shield hob; the surface thermal image monitoring module is used for collecting temperature data and image data of the surface of the shield hob through an infrared thermal imager; and the self-adaptive repairing module is used for determining repairing parameters of the shield hob and generating a repairing instruction, so that self-adaptive repairing is carried out on the shield hob through preset repairing equipment according to the repairing instruction. According to the invention, the sensor network is successfully integrated in the gradient coating, and integrated fusion of structural health monitoring and protection functions is realized.

The invention discloses a preparation method of a foamed thermal-insulation ceramic decorative plate in the technical field of building decorative materials. The method comprises the following steps: carrying out ball milling, spray drying, granulating and ageing on raw materials such as ceramic waste and kaolin; mixing and dispersing the aerogel-hydrogel gradient core-shell structure composite modified material and ceramic particles, and sieving to obtain composite powder; compounding sodium bicarbonate and azodicarbonamide with a foaming agent, mixing the foaming agent with the composite powder, and adding a surfactant and a dispersing agent to adjust the viscosity so as to prepare expandable ceramic slurry; the slurry is injected into a mold and coated with low-temperature glaze, and stepped heating sintering is conducted through a tunnel kiln and comprises the steps of preheating glue discharging, primary foaming, secondary sintering, gradient cooling and the like. The thermal insulation performance, the mechanical strength, the weather resistance and the decoration performance are synergistically improved, and the product is low in heat conductivity coefficient, high in compressive strength, excellent in ultraviolet aging resistance, firm in decoration layer combination and suitable for building outer walls and other scenes.

The invention belongs to the technical field of composite material manufacturing, and discloses a structural battery integrated composite board and a forming method and application thereof. According to the composite board, carbon fiber reinforced materials are adopted as positive and negative electrodes, glass fiber materials are adopted as a diaphragm and an insulating layer, epoxy resin-based solid-state structure electrolyte is adopted as a bonding packaging medium, and a curing agent, ionic liquid, electrolyte lithium salt, nano ceramic particles and other auxiliaries of specific types and proportions are introduced into epoxy resin; the multifunctional modification of the resin matrix is realized. And meanwhile, doping and surface grafting modification are performed on the electrode material, so that the energy density and the mechanical strength of the battery are improved. And further constructing a low-temperature formed metal or carbon-based circuit layer on the outer surface of the structural battery to form an integrated complex comprising the circuit board, the structural battery and the bearing structure. The composite board satisfies dielectric insulation and reliability, realizes integrated energy supply and signal processing, and is widely applied to weight and volume sensitive fields such as aerospace and new energy automobiles.

The invention relates to color cosmetic compositions including, in a physiologically acceptable medium, flattened, porous ceramic particles and at least one coloring agent, as well as to methods and kits including such compositions in container(s) or in application.

The invention relates to cosmetic compositions including, in a physiologically acceptable medium, flattened, porous ceramic particles, as well as to methods and kits including such emulsion compositions in container(s) or in application.

The invention discloses a super-hydrophobic heat insulation / radiation refrigeration integrated fabric and a preparation method thereof.The method comprises the steps that firstly, a heat insulation layer is constructed on a base fabric through electrostatic spraying, specifically, PU and SCA are dissolved in DMF, SiO2 aerogel is added to form spraying liquid, a three-dimensional network structure is formed between aerogel and fibers through the synergistic cross-linking effect of SCA and PU, the aerogel is firmly anchored, and the heat insulation layer is formed; the adhesive force and the washability of the coating are improved. PVDF-HFP and ZrO2 nano-particles are blended and spun to form a composite structure with nano-fibers wrapping ceramic particles, particle aggregation is avoided, and the radiation refrigeration and heat insulation performance of PVDF-HFP and ZrO2 nano-particles are synergistically exerted. Finally, a substrate-heat insulation-refrigeration three-dimensional composite structure is formed through hot pressing treatment, chemical bonding of all the layers is achieved through SCA, the fabric has the characteristics of high strength, abrasion resistance, hydrophobicity, heat insulation and radiation refrigeration, and the problem that durability and comfort of a traditional material are difficult to achieve at the same time is solved.

The invention belongs to a thermal interface material of electronic equipment, and particularly relates to a thermal interface material with high thermal conductivity and electric conductivity as well as a preparation method and application thereof. The thermal interface material with high thermal conductivity and electric conductivity comprises graphene films and oriented carbon fiber / silica gel composite layers which are alternately stacked, in the thermal interface material with high thermal conductivity and electric conductivity, the graphene films are neatly arranged in the vertical direction. The carbon fibers are also directionally arranged in the vertical direction and are almost parallel to the graphene film, and part of the carbon fibers are in direct contact with the graphene film; the raw materials of the carbon fiber / silica gel composite layer comprise a silica gel matrix, carbon fibers and ceramic micro powder. The graphene film has a core heat conduction function, and the oriented carbon fiber not only shares transmission work of part of heat, but also converges the heat to a graphene film trunk. The ceramic particles form a bridging structure in the interface area to reduce interface thermal resistance. Direction deflection and scattering loss in heat flow transfer are reduced to the maximum extent, and the problem of'heat conduction island 'of a traditional composite material is solved through the synergistic effect of multi-scale paths; the heat-conducting property and the mechanical property of the material are synergistically improved.

The invention relates to the technical field of electronic packaging and welding, and particularly discloses Ag-Cu-Ti-based composite brazing filler metal and a preparation method and application thereof. The composite material comprises the following components in percentage by weight: 87%-96.5% of Ag-Cu28 alloy powder, 3%-8% of TiH2 and 0.5%-5% of a reinforcing phase, and the reinforcing phase is Ag-coated titanide or ceramic particles. According to the method, the comprehensive welding performance of the brazing filler metal is improved by adopting a method of coating the reinforcing phase with Ag, and meanwhile, the negative influence caused by adding the reinforcing phase is overcome. Aggregation of reinforced phase particles can be reduced through Ag coating, uniform distribution of the reinforced phase fine particles in the brazing filler metal is achieved, and generation of large brittle phases is greatly reduced. And meanwhile, the fluidity of the brazing filler metal is enhanced, the joint filling capacity of the brazing filler metal is improved, and the welding voidage of a connector is effectively reduced. In addition, the Ag coating can avoid the reaction between the reinforcing phase and the Ti element, and the influence of the reinforcing phase on the melting point of the brazing filler metal is reduced.

The invention relates to a TiC-SiC reinforced 304 stainless steel composite coating based on high-speed laser cladding and a preparation method of the TiC-SiC reinforced 304 stainless steel composite coating. The composite coating with 304 stainless steel as a metal matrix phase and TiC and SiC as ceramic reinforced phases is prepared on the surface of a steel matrix by adopting a high-speed laser cladding technology. In the cladding process, the TiC ceramic particles keep stable in structure, the SiC ceramic particles are subjected to controllable partial decomposition, the Si element released through decomposition forms a Si enrichment area on the interface of the ceramic particles and the metal matrix, and the C element released through decomposition reacts with the metal matrix to generate a carbide phase. Therefore, the composite coating which is compact in structure and good in interface bonding is obtained and is suitable for surface protection of steel components serving under the working condition of coupling abrasion and corrosion.

The invention discloses a high-reliability packaging quality assessment method and system based on multi-source process data, and relates to the technical field of quality assessment, and the method achieves the online sensing of the orientation consistency of casting ceramic particles through the nondestructive scanning of an unsintered green tape by adopting a terahertz spectrum. Material waste and procedure interruption caused by destructive detection are avoided; secondly, the cutting edge morphology is synchronously collected in the scribing process, geometric feature quantification is carried out, the recognition of the edge breakage state is improved from subjective qualitative judgment to objective quantitative characterization, and the detection consistency and precision are remarkably improved; the frequency spectrum coding data reflecting the internal quality and the shape coding data reflecting the external defects are associated point by point, and a two-dimensional mapping relation of the internal process parameters and the external processing results is constructed, so that whether the cutting edge breakage is derived from potential abnormity in a tape casting stage or not can be accurately traced; and a data closed loop is provided for backtracking optimization of process parameters.

The invention relates to the technical field of casting, and discloses a gas turbine blade casting method which comprises the following steps: preparing a composite surface coating containing zircon powder, silicon carbide particles, alumina micro powder, a silicon-aluminum composite sol binder and a xanthan gum stabilizer; a double-layer gradient coating structure with the inner layer rich in silicon carbide and the outer layer rich in aluminum oxide is formed on the surface of the wax mold through a step-by-step coating technology; and a gas turbine blade casting is obtained through shell preparation, sintering and high-temperature alloy pouring. Through the synergistic effect of a double-phase ceramic particle system, the gradient sintering characteristic of the silicon-aluminum composite sol and the suspension stabilization effect of xanthan gum, the problems that in a traditional coating system, surface layer sintering is uneven, particles are layered and settled, and a sol system is unstable are solved, the surface roughness Ra of a casting is smaller than or equal to 2.5 micrometers, the size precision is improved by 30% or above, and the casting quality is improved. The service life of the coating is prolonged to more than 7 days.

The application discloses a ZTA ceramic particle preform, preparation and application of realizing metallurgical interface combination between ZTA and high manganese steel matrix. The application adopts a ball milling process to prepare a slurry from high manganese steel powder, Zr-Fe powder, ZTA micro powder and ethanol, soaks ZTA particles in the slurry, takes out and dries and sinter, obtains ZTA particles with a single layer of coating, soaks the ZTA particles in high manganese steel powder slurry again, obtains ZTA particles with two layers of coating, obtains ZTA ceramic preform through pressureless sintering, realizes solidification of the double coating layers, and the ZTA ceramic porous preform can effectively promote high manganese steel melt infiltration and prevent the preform from collapsing under thermal shock during casting. Through the bridge effect of the FeZr-ZTA-high manganese steel powder double coating layers, a metallurgical combination interface is formed between the ZTA and the high manganese steel matrix, so that the prepared ZTA ceramic particle reinforced high manganese steel composite material has excellent three-body wear resistance.

The invention discloses ceramic particle reinforced medium-entropy alloy powder with large density difference as well as a preparation method and application thereof. The composite powder consists of 3-5wt% of B4C powder and the balance of CoCrNi alloy powder. The average particle size of the B4C powder is less than 0.5 mu m, and the average particle size of the CoCrNi alloy powder is 80-150 mu m; b4C powder and CoCrNi alloy powder are mixed through an acoustic resonance mixing technology, and the surface of the CoCrNi alloy powder is coated with nanometer B4C powder. According to the method, the surface of CoCrNi alloy powder is evenly coated with small-particle-size B4C powder through the acoustic resonance mixing technology to prepare the CoCrNi-B4C composite powder, the optimal balance of strength and toughness is achieved, uniform powder feeding cladding is achieved, the surface of a to-be-cladded plate is cladded with the composite powder subsequently through rectangular light spot laser equipment, and therefore the composite powder is obtained. The large-area crack-free laser cladding high-hardness CoCrNi-B4C composite coating is obtained, the cladding efficiency is greatly improved, and the hardness of the coating exceeds 400 HV.

The application discloses a kind of high-stability two-phase colloidal ceramic ink material and preparation method and application thereof, the two-phase colloidal ceramic ink material is composed of ceramic colloidal suspension, polymer colloidal suspension, additive, the ceramic colloidal suspension is composed of ceramic, solvent, dispersing agent, binder;The polymer colloidal suspension is composed of water, surfactant, rheological modifier, colloidal stabilizer.The two-phase colloidal ceramic ink material provided in the application, ceramic powder colloidal suspension and polymer colloid two phases mutually adsorb and combine, and by surfactant adjust the wetting of polymer colloid on the surface of ceramic particle and the thickness and area of adsorption layer, form the micro colloidal structure of ceramic particle wrapped by polymer colloid and have excellent stability, can be stably stored at normal temperature for 3 months and above without the change of rheological property, and can be consistently formed process condition stable printing after 3 months.

To provide a sensor element and a gas sensor that prevents detachment due to the ingress of water into a feeder connected to an electrode and facing a communication hole to communicate with the outside, a gas sensor element (100) comprises: a pair of electrodes (104a, 106a); and a pair of feeders (104b, 106b) each connected to the pair of electrodes, wherein one (104b) of the pair of feeders is an internal feeder arranged within the sensor, and part of one of the pair of feeders faces a communication hole (105a, 106a, 107a, 109a, 111a) provided in the sensor element to communicate with an outside; the internal feed is designed to contain precious metal particles (104M) of one or more types selected from the group Pt, Pd, Rh and Au, ceramic particles (104S) and pores (104V);a porosity of the internal feed is greater than 0% and 11% or less; and a proportion RA of the total area of ​​large diameter pores, each with a cross-sectional area of ​​5 µm; 2 or more, in relation to a total pore area in a cross-section of the internal supply, which is 8% or more.

The application provides a preparation method of laser additive manufacturing crack-free Ni3Al-based high-temperature alloy, comprising the following steps: (1) uniformly mixing micron-sized Ni3Al-based high-temperature alloy powder and nano Hf ceramic particles, so that the nano Hf ceramic particles are uniformly wrapped on the surface of the micron-sized Ni3Al-based high-temperature alloy powder, to obtain a composite powder; (2) drying the composite powder; (3) layer-by-layer melt forming the composite powder by using a laser directional deposition device, to obtain the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy. The application also provides the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy prepared by the method. The preparation method of the laser additive manufacturing crack-free Ni3Al-based high-temperature alloy can prepare the crack-free Ni3Al-based high-temperature alloy by the laser additive manufacturing method, and is simple in preparation and low in cost.

The application discloses a kind of high-temperature-resistant impact-resistant heat-absorbing heat-insulating composite ceramic brick and its preparation method and application, the ceramic composite brick includes heat-insulating layer and heat-absorbing layer;The main component of the heat-insulating layer is vacuum nanometer heat-insulating ceramic particles and alloy metal particles containing one or more of tungsten, cobalt, molybdenum or vanadium elements;The main component of the heat-absorbing layer is 3N grade and above high-purity alumina and black pigment;The components of the heat-insulating layer and the heat-absorbing layer are filled in the same mold in sections, and then are pressed to form a composite.The heat-insulating layer not only has excellent heat-insulating performance, but also has good toughness and impact resistance;The heat-absorbing layer can quickly absorb heat and accumulate heat, the temperature rising speed in the furnace is increased by more than 30%, the set temperature is quickly reached, the heat-insulating performance is increased by more than 2 times, and has good practical value and important energy-saving and environmental protection social value.

The invention discloses a phase-change radiation refrigeration coating which is prepared by the following steps: dispersing nano aluminum oxide particles in phase-change paraffin in advance to form a high-thermal-conductivity and high-radiation composite phase-change material, and encapsulating the high-thermal-conductivity and high-radiation composite phase-change material in a porous ceramic skeleton through vacuum infusion to obtain composite phase-change ceramic particles; then, the composite phase-change ceramic particles are dispersed in polyol resin containing aluminum oxide microspheres, the aluminum oxide microspheres accurately block pores in the surface of the porous ceramic through particle size matching, paraffin leakage is prevented, and the aluminum oxide microspheres serve as heat conduction channels and radiation units at the same time, so that it is guaranteed that the finally prepared coating integrates phase-change temperature control, efficient heat conduction and radiation refrigeration; the high sunlight reflectivity (94%-98%) and the high atmospheric window infrared emissivity (92%-96%) are achieved, and the thermal response rate and the leakproof performance are remarkably improved.

The application discloses a kind of water-based ceramic slurry adhesives for ceramic-coated polyolefin separators, and relates to the technical field of polyolefin separators.The adhesives prepared by the preparation method provided by the application can promote the uniform dispersion of inorganic ceramic particles in the ceramic slurry, and the excellent adhesion of the adhesives can firmly bond the inorganic ceramic particles to the separators, preventing the phenomenon of powder falling during production, transportation and use, thereby ensuring the improvement effect of the thermal stability of the inorganic ceramic particles on the separators.

The invention discloses a gradient strengthening preparation method of a cast high-entropy alloy composite material based on a laser cladding preform, and belongs to the technical field of metal matrix composite material preparation. The method comprises the following steps: firstly, preparing composite powder of a high-entropy alloy and a nano ceramic reinforced phase by combining plasma-assisted ball milling with a pulse electromagnetic field; then constructing a prefabricated body with a gradient pore structure by adopting an intelligent regulation and control laser cladding technology; the prefabricated body and a congruent-component high-entropy alloy cast ingot are innovatively metallurgically bonded through a vacuum gradient infiltration process, and a large-size overall composite material is prepared; and finally, forming a gradient nanostructure on the surface layer of the material through ultrasonic-assisted laser surface reconstruction and small-deformation gradient heat treatment. According to the method, the technical problems that reinforcing phases are uneven in distribution, the interface bonding strength is low, and large-size components are difficult to prepare are successfully solved, the prepared composite material has the excellent gradient performance that the surface hardness is larger than or equal to 12 GPa, and the core hardness is larger than or equal to 8 GPa, ceramic particles are evenly distributed in a three-dimensional network shape, the 800-DEG C high-temperature oxidation resistance is improved by 30% or above compared with a traditional high-entropy alloy, and the composite material is suitable for large-size components. The method is particularly suitable for manufacturing high-performance key components in the fields of aerospace, national defense and military industry and the like.