148 results about "Phase transition temperature" patented technology

The invention discloses a method for predicting phase change temperature of a selective laser melted NiTi alloy based on machine learning, which relates to the technical field of metal material performance prediction, and comprises the following steps: step S1: collecting an initial feature data set of an SLM-NiTi alloy from experiments and literature related to the SLM-NiTi alloy, step S2: performing data preprocessing on the initial feature data set; performing feature screening on a standard feature data set to form a key feature data set; step S3: randomly dividing the key feature data set into a training set and a test set, using a variety of machine learning algorithms, using the screened key features as input features of the model, and using the phase change temperature feature set of the SLM-NiTi alloy as a target feature, constructing multiple SLM-NiTi alloy phase change prediction models, and training them on the training set; step S4: predicting the test set after the training is completed, and obtaining the optimal SLM-NiTi alloy phase change prediction model.

The invention discloses a composite thermochromic window with a dual-band dynamic regulation and control function. The composite thermochromic window comprises a first transparent substrate, a tungsten-doped vanadium dioxide film, a second transparent substrate and a hydrogel layer. The tungsten-doped vanadium dioxide film is deposited on the upper surface of the first transparent substrate, and the phase transition temperature is 25-32 DEG C; the hydrogel layer is thermo-sensitive poly (N-isopropylacrylamide) and is encapsulated between the two transparent substrates, and the low critical phase transition temperature is 32 + / -2 DEG C. When the temperature is lower than 25 DEG C, the infrared transmittance of the tungsten-doped vanadium dioxide film is larger than or equal to 75%, and the visible light scattering rate of the hydrogel layer is smaller than or equal to 10%; when the temperature is higher than 32 DEG C, the near-infrared transmittance of the tungsten-doped vanadium dioxide film is reduced to the minimum value, and the visible light scattering rate of the hydrogel layer is increased to 35% or above. Compared with the prior art, the system and the method have the advantages that dual-band dynamic regulation and control of visible light and near-infrared light are achieved, the indoor photo-thermal environment can be automatically regulated according to the environment temperature, and the building energy utilization efficiency is improved.

The invention relates to the technical field of oil and gas reservoir exploitation equipment, in particular to a compression type metal packer which is used for solving the problem that a high-temperature and high-pressure deep well rubber cylinder serving as a sealing element cannot meet operation requirements, and the compression type metal packer comprises a first connector and a second connector which are connected to the upper end and the lower end of a central pipe; a sealing mechanism is arranged in the middle of the central pipe and comprises a metal sealing cylinder, a sealing ring and a sealing ring; the upper sealing cone sleeves the central pipe and is arranged at the upper part of the metal sealing cylinder; the lower sealing cone sleeves the central pipe and is arranged at the lower part of the metal sealing cylinder; the metal sealing cylinder is made of nickel-titanium-based superelastic alloy; the metal sealing cylinder is made of nickel-titanium-based superelastic alloy, annealing treatment is conducted at the temperature of 650 DEG C, thermal circulation and mechanical training are conducted at the temperature above the phase change temperature, the stable mechanical performance is obtained, the ideal deformation rate can be obtained under the small load effect, the setting force and the unsetting force are reduced, and the metal sealing cylinder is suitable for high-temperature and high-pressure deep well operation.

The invention belongs to the field of functional nano materials, and relates to a method for large-scale preparation of monoclinic phase vanadium dioxide nano powder, a heat insulation film and application of the heat insulation film, and large-scale preparation of the monoclinic phase vanadium dioxide nano powder is successfully achieved by combining a coprecipitation method with low-temperature calcination. The obtained product has excellent size uniformity (the average particle size is 65 + / -10 nm) and an adjustable phase change characteristic (61-68 DEG C). The polymer-based composite film prepared based on the nano powder shows excellent optical performance, and the method has the advantages of mild reaction conditions (less than or equal to 600 DEG C), controllable product morphology and phase transition temperature and the like, and provides a reliable solution for industrial production of nano functional materials for intelligent windows.

The invention relates to the technical field of computational material science, in particular to a high-entropy ceramic phase change strengthened silver-based electric contact material component screening method, which comprises the following steps of: firstly, based on first principle calculation and Monte Carlo molecular dynamics simulation, combining experimental data correction, and screening out a (MgCoNiCuZn) O component proportion of which the phase change temperature is close to a silver melting point and the single-phase enthalpy value is high; secondly, dynamically simulating wetting behaviors of liquid silver and O with different component proportions (MgCoNiCuZn) through molecular dynamics, and selecting a component proportion with the best wettability with the liquid silver in combination with phase boundary energy calculation and wetting angle experimental verification; and finally, preparing a sample based on spark plasma sintering, actually measuring a wetting angle by using a seat drop method, and feeding back and correcting simulation parameters to form closed-loop optimization. The method is suitable for wettability collaborative optimization screening of a rare earth element doped high-entropy oxide system and liquid metal, proper components can be efficiently and accurately screened out, and the performance of the silver-based electric contact material is improved.

The invention discloses a method for increasing the phase transition temperature of Al2O3 aerogel through grain boundary pinning and nano-structure strengthening, which comprises the following steps: co-hydrolyzing an aluminum source, yttrium salt, a silicon source and magnesium salt to form sol through the coordination of double mechanisms of grain boundary pinning and nano-domain isolation, and carrying out gradient heating aging, mixed medium supercritical drying and two-stage sintering to obtain the phase transition temperature of the Al2O3 aerogel. The gamma-alpha phase transition temperature of the Al2O3 aerogel is greater than or equal to 1300 DEG C. The specific surface area of the aerogel after heat treatment at 1300 DEG C is larger than 100 m / g, the process cost is controllable, and the aerogel is suitable for industrial production and can be applied to extreme environments such as a spacecraft thermal protection system and a high-temperature industrial furnace lining.

The invention provides an SEBS (Styrene-Ethylene-Butylene-Styrene)-based liquid crystal elastomer and a preparation method thereof, and belongs to the field of synthesis and application of thermally-induced reversible deformation liquid crystal polymers. The liquid crystal elastomer is a low-degree cross-linked polymer network prepared from an ethylene-ethylene / butylene-styrene block copolymer SEBS and a double-end sulfydryl main chain type liquid crystal oligomer through photo-cross-linking curing, and a two-step secondary cross-linking mode is adopted. The material is prepared through a two-step method of PS segment physical structural domain pre-crosslinking and thiol-ene click reaction photo-crosslinking, and has bidirectional reversible deformation capability. By controlling the content of the liquid crystal units and the crosslinking and curing degree, the phase transition temperature and reversible deformation capability of the polymer material are regulated and controlled; a new thought and a new method are provided for preparing an intelligent flexible driver material with a novel function; on the basis of the liquid crystal polymer network, the SBS and SEBS materials can be developed towards high performance and intelligence.

The invention relates to a coated doped vanadium dioxide film and a preparation method and application thereof. The preparation method comprises the following steps: preparing a precursor vanadium solution by taking a first vanadium source and a first reducing agent as raw materials; adding a first film-forming agent and a doping agent, fully reacting, and performing aging treatment to obtain a doped precursor liquid; preparing a dispersion liquid from the M-phase VO2 nano-powder, adding a coating material precursor into the dispersion liquid, and reacting to prepare VO2 core-shell nano-powder; and uniformly mixing the VO2 core-shell nano powder and the doped precursor liquid to obtain a VO2-based coating, and carrying out coating film forming, drying and annealing treatment to obtain the coated doped vanadium dioxide film. According to the invention, through doping modification, the film has high transmittance, the phase change temperature is reduced, the core-shell structure effectively enhances the weather resistance of the material, under the combined action of doping and modification, the performance of the obtained film is effectively improved, and the film can be applied to thermochromic intelligent energy-saving windows and is long in service life.

The invention discloses an anionic surfactant and a preparation method and application thereof.The anionic surfactant has a double-wedge-shaped molecular structure, alkaline earth metal benzene sulfonate serves as a polar hydrophilic wedge tip, a long-chain alkoxy flexible chain segment serves as a hydrophobic wedge group, the surface tension of water can be remarkably reduced in an aqueous solution, and the anionic surfactant has excellent emulsifying capacity. The molecular structure is based on alkaline earth metal benzene sulfonate and has good thermotropic and lyotropic liquid crystallinity, the liquid crystal phase temperature range of the molecular structure exceeds 140 DEG C, and the phase transition temperature and the mesogenic state temperature range can be controlled by adjusting the number of carbon atoms of an alkoxy substituent. When in a mesogenic state, the molecules can form a supramolecular columnar phase through self-assembly aggregation, and the columnar structure can form a transmission channel with ion recognition in the column center direction. By utilizing the characteristic, a novel bionic ion selective conduction membrane can be constructed, and the biomimetic ion selective conduction membrane has wide application potential in the aspects of preparation of ion selective electrodes and chemical sensors and the like.

The invention belongs to the technical field of infrared radiation materials, and particularly relates to an infrared radiation material and a preparation method and application thereof. The infrared radiation material comprises a base material layer, a metal layer, an ink layer and a polymer protection layer which are sequentially stacked, the ink layer comprises modified vanadium dioxide; the modified vanadium dioxide is obtained by modifying vanadium oxydichloride by adopting a metal compound. According to the invention, the multi-layer metal layer with high infrared reflection and low infrared radiance is used as the bottom layer, and the multi-layer metal layer shows strong reflection and low absorption effects in mid-infrared and far-infrared bands; infrared rays can penetrate through the ink layer and are reflected on the surface of the metal layer to be less absorbed, the modified vanadium dioxide is added into the ink layer, the phase change temperature can be greatly reduced through doping modification of a metal material in the vanadium dioxide, the phase change is reduced to the room temperature or below, and then the infrared radiance is obviously reduced. And all the layers act together to obtain the infrared radiation material with lower infrared radiance.

The invention discloses a multi-element eutectic molten salt eutectic component and melting point rapid prediction method, which comprises the following steps: S1, based on binary phase equilibrium data, using a Wilson model to obtain binary interaction parameters of corresponding components, and constructing a binary system database including binary system melting point, phase change enthalpy, molar ratio, biased Gibbs fusion energy and interaction parameters; and S2, based on the binary interaction parameters obtained in the step S1, calculating the eutectic components and the melting point of the multi-component molten salt by using a thermodynamic principle and a Newton-Raphson method in combination with the thermophysical property data of the single-component molten salt. According to the multi-element eutectic molten salt eutectic component and melting point rapid prediction method, the multi-element molten salt system eutectic component and the phase transition temperature can be calculated through binary molten salt system data, the dual advantages of being high in prediction speed and high in prediction precision are achieved, and the method has great significance in reducing experiment combinations, shortening experiment time and rapidly screening available formulas.

The invention discloses a semiconductor film material suitable for the field of intelligent energy conservation and a preparation method thereof. According to the TiO2 / WxV1-xO2 / ZrO2 multilayer film system provided by the invention, the phase transition temperature of the WxV1-xO2 functional layer film is adjusted by doping VO2 with W < 6 + > ions, the crystallization quality of the WxV1-xO2 functional layer film is improved by adopting TiO2 as a seed layer, and the optical performance of the multilayer film is regulated and controlled by adopting ZrO2 as an anti-reflection layer. The multi-layer thin film system provided by the invention has a metal-semiconductor conversion characteristic, the phase change temperature can be as low as 37 DEG C, the light modulation capability in a wavelength range of 300-2500nm can reach 11.9%, and meanwhile, the visible light transmittance at room temperature can be kept at 40% or above. In addition, the multilayer film system has the advantages of being easy to prepare, low in manufacturing cost, high in environmental stability and suitable for large-scale production.

The invention discloses a double-phase-change temperature self-response thermal diode and a preparation method thereof, and belongs to the technical field of phase change thermal diode manufacturing. The thermal diode solves the problems that an existing thermal diode is complex in structure, high in direction dependence, weak in thermal rectification effect and the like. The phase change material comprises a supporting framework, a first heat conduction layer and a second heat conduction layer are arranged at the two opposite ends of the supporting framework respectively, a PNIPAM hydrogel phase change layer and a heat insulation functional layer are sequentially arranged in the supporting framework from the first heat conduction layer to the second heat conduction layer, and the heat insulation functional layer is provided with a steam channel; phase change of a water medium is induced through phase change of the PNIPAM hydrogel phase change layer, and heat flow generated by phase change of the water medium flows through the steam channel to achieve one-way heat transfer. Compared with the technical defects of complex preparation process, obvious structural direction dependence and response delay in the prior art, the preparation method has the advantages of simple and time-saving preparation process, weak direction dependence, high self-response speed and strong thermal rectification effect.

The invention belongs to the technical field of titanium alloy processing, and particularly relates to a preparation method of a titanium-copper alloy plate. According to the method, high-quality sponge titanium and high-purity electrolytic copper serve as raw materials, a Ti-5Cu alloy plate ingot is formed at a time through an EB electron beam cold bed melting process, volatilization and burning loss of a low-melting-point alloy element Cu are reduced by introducing pure argon or helium protective atmosphere with a certain pressure into a furnace chamber, gas impurities and low-melting-point impurities in the alloy are removed according to the partial pressure principle, and the high-quality sponge titanium and the high-purity electrolytic copper are obtained. The electrode preparation process is omitted, and the production process is simplified. By utilizing the advantages that the Ti-5Cu alloy is small in deformation resistance and good in plasticity when being rolled in a beta-phase region, the Ti-5Cu alloy is rolled in the beta-phase region above the phase transition temperature, it is guaranteed that the deformation amount of the alloy in the beta-phase region reaches 40-90%, and it is avoided that when machining of the beta-phase region is finished, thick grains are reserved in metal, and the mechanical property of the plate is reduced; and a uniform fine grain structure or a basket structure and relatively high mechanical properties can be obtained.

The invention discloses a TPE-based temperature-sensitive dendronized fluorescent molecule as well as a preparation method and application thereof, relates to the field of intelligent biosensors, and provides an innovative technical scheme of connecting a hydrophilic ether chain and hydrophobic tetraphenylethylene (TPE) based on an ester bond. By utilizing the stability and reaction activity of ester bond balance, stable connection of a hydrophilic ether chain and hydrophobic TPE is ensured, and meanwhile, molecules can regulate and control the reaction under specific conditions. According to the present invention, through the flexibility of ester bond synthesis and the accurate design of the molecular structure, the regulation of key parameters such as the hydrophilic ether chain length, the TPE substituent group and the like is achieved, the novel TPE-based temperature-sensitive dendronized fluorescent molecule is constructed, and the molecule can obtain different phase change temperatures and fluorescence intensities through the regulation of the substitution degree of the dendronized alkoxy ether element so as to provide the novel TPE-based temperature-sensitive dendronized fluorescent molecule, and the aggregation behavior of the molecules can be regulated and controlled through the temperature. Further, through a co-assembly effect, a more stable aggregate is formed, the amplification of an AIE effect is realized, and the environmental adaptability of a drug carrier is improved.

The invention discloses a natural convection-containing solid-liquid phase change prediction method based on LBM and physical information neural network fusion, and belongs to the field of solid-liquid phase change simulation. The problem that an effective scheme capable of reliably and accurately predicting the natural convection-containing solid-liquid phase change process is lacked at present is solved. The method comprises the following steps: constructing a fusion model of an LBM and a physical information neural network, wherein the model comprises a sub-network module and a macroscopic quantity calculation module; constructing a total loss function of the model, wherein the total loss function comprises data loss, equation constraint loss, initial condition loss and boundary condition loss; optimizing network parameters based on a self-adaptive training strategy of the residual error; and inputting a to-be-predicted space-time position coordinate, outputting a distribution function through the trained fusion model, deriving through a macroscopic quantity calculation module to obtain a temperature field, a velocity field and liquid content distribution, and determining a space-time evolution process of the phase change interface based on a mapping relationship between the temperature and the phase change temperature. The method is used in the fields of material processing and energy storage.

Intelligent control of solar transmission through windows promises to reduce energy consumption for thermal comfort in buildings. However, the ability of current smart windows to regulate solar gain based on tunable extinction of phase-change materials is not optimum. A thin-film thermochromic device based on tunable light scattering of hydrogel microparticles of prescribed diameters is reported. In the study, poly (N-isopropylacrylamide)-2-Aminoethylmethacrylate hydrochloride (pNIPAm-AEMA) microparticles are synthesized, with low phase transition temperature ˜32° C. Notably, the average size of pNIPAm-AEMA particles can vary from 1388 nm at 25° C. to 546 nm at 35° C., leading to unprecedented infrared transmittance modulation of 75.6%, in agreement with the numerical simulation based on Mie theory. A high luminous transmittance of 87.2% is accomplished. The pNIPAm-AEMA device demonstrates tunable scattering with excellent stability and scalability, which may find application in a broader field of light management beyond energy-saving smart windows.

The present invention provides a method for calculating the solidification thermodynamics of a multi-component system of alloy steel, and relates to the technical field of steel continuous casting. The method first calculates the pseudo-binary phase diagram of solute elements at different contents of multi-alloy steel, obtains a δ / γ phase transition temperature data set, establishes a δ / γ phase transition temperature Bp neural network prediction model, and trains the Bp neural network prediction model; and optimizes the liquidus temperature solution formula, and then couples the Bp neural network prediction model and the liquidus temperature solution formula to the Ueshima model to obtain the Bp-Ueshima model; establishes the relationship between different cooling rates and secondary branch arm spacing during solidification; and then realizes the calculation of the phase change characteristic temperature and solute microsegregation of multi-alloy steel according to the Bp-Ueshima model. The method uses the Bp neural network prediction model and the optimized liquidus temperature solution formula as a criterion to judge whether the δ, γ, and L phase transitions occur, which is more in line with the actual solidification process of steel.

The present invention discloses a method for inducing self-assembly of poly(phenylacetylene) into films by photoirradiation cross-linking polymerization reaction. Two phenylacetylene monomers containing dendrimeric alkoxy ether units and acrylate functional groups are used. Based on the two phenylacetylene monomers, a dendritic phenylacetylene copolymer is prepared by metal-catalyzed copolymerization reaction. The copolymer has a radial amphiphilic structure and temperature-sensitive characteristics. When its aqueous solution is heated above the phase transition temperature, dehydration aggregation occurs to form film-like assemblies. A photoinitiator is added to the copolymer aqueous solution, and under the condition of ultraviolet light irradiation above the phase transition temperature of the copolymer, the polymer further undergoes cross-linking and self-assembly to directly obtain a thin film. The thin film has excellent temperature responsiveness, and its thickness can be regulated by the copolymer concentration, copolymerization ratio, and irradiation time. The invention provides a new way to prepare thin film materials, with short reaction time, simple steps, and the prepared intelligent thin films having good prospects in aspects such as material separation and molecular selective permeation.

The present application relates to a kind of X80 pipeline electric arc additive manufacturing method and system based on thermal-mechanical coupling regulation mechanism, the method includes: first, the continuous cooling transformation curve of X80 steel is determined to determine phase transition temperature interval;Thermal-mechanical coupling finite element model containing mobile heat source and mobile force source is constructed and calibrated;On this basis, process prediction model is established, and the mapping relationship between process parameter and temperature field, stress field is obtained;Optimization algorithm is used in simulation space to carry out reverse optimization, and the optimal thermal-mechanical coupling process parameter combination is obtained;Finally, in actual repair process, deposit layer temperature is monitored in real time by infrared temperature measurement, when temperature falls into phase transition temperature interval and approaches optimal impact intervention temperature, drive with welding ultrasonic impact device to execute mechanical impact.The present application can significantly reduce residual tensile stress and improve the degree of grain refinement.

This invention discloses a room-temperature phase pyroelectric material and its preparation method, relating to the field of pyroelectric material technology, with the chemical formula C4H. 14 N₂OPbCl₄ is prepared as follows: 2-Dimethylaminoethylamine is cooled and stirred in an ice-water bath, then hydrogen peroxide solution is added dropwise while stirring. After the reaction, the resulting reaction solution is vacuum dried to obtain the nitrogen oxide of 2-dimethylaminoethylamine. The nitrogen oxide of 2-dimethylaminoethylamine and lead chloride are added to a concentrated hydrochloric acid solution, heated in an oil bath, and stirred to obtain a pyroelectric material. The pyroelectric material of this invention has a perovskite structure and undergoes a reversible phase transition reaction at a phase transition temperature of 27°C. During the phase transition, a current is generated at the polar axis of the crystal. The phase transition temperature at room temperature allows the pyroelectric material to operate within a relatively stable temperature range, providing reliable energy collection performance and showing great application value in waste heat utilization, self-sustaining systems, and other fields.

The invention belongs to the technical field of shape memory alloys, and particularly relates to a shape memory alloy with excellent high-temperature oxidation resistance and a preparation method and application thereof. According to the provided shape memory alloy, a compact Al2O3 oxide layer and / or high-adhesion chemical bonding can be generated, when Al and Si are added at the same time, tiny pores and grain boundary gaps of the Al2O3 oxide layer are filled with glassy state or fine crystalline state SiO2, and a continuous chemical protection layer of matrix-Ti (Hf)-O-Si-O-Al-Al2O3 is formed through bonding, so that the high-temperature oxidation resistance of the shape memory alloy is obviously improved; hf with a high melting point and a large atomic radius and the use amount of Al and Si can be further regulated and controlled, so that the shape memory alloy has excellent high-temperature oxidation resistance, austenite phase transformation temperature and plasticity comprehensive performance; therefore, the technical problem that an existing Ni-Ti-Hf shape memory alloy is low in high-temperature oxidation resistance is solved.

The application discloses a kind of W-VO2-based middle far infrared spaceflight thermal control multilayer film and its preparation and application method.The film includes aluminium substrate, inorganic medium layer, W-VO2 functional layer and protective layer in turn from bottom to top.The medium layer is used to constitute interference cavity;W-VO2 functional layer is deposited using magnetron sputtering method and is annealed, realizes phase change crystallization and the dynamic control of infrared emissivity;Protective layer is used to protect functional layer from environmental oxidation and mechanical damage, while the influence on infrared performance is limited.By adjusting the proportion of W element doping and the thickness of each layer, the phase transition temperature can be adjusted in the range of 15~68℃, and the emissivity modulation rate of 2~25μm wave band is 0.5-0.7, the visible reflectivity is 0.55-0.65.No obvious oxidation occurs after being placed in air for two weeks.The film has simple structure, controllable preparation process and stable performance, and is suitable for spacecraft cabin, battery panel, optical load and other aspects.

The invention provides a liquid crystal elastomer fiber, a preparation method thereof and an intelligent fabric, and relates to the technical field of liquid crystal elastomer fibers.The liquid crystal elastomer fiber is prepared from a liquid crystal monomer RM257, a chain extender bis (3-mercaptopropionic acid) ethylene glycol, a cross-linking agent triallyl isocyanurate, an antioxidant, a photoinitiator and a catalyst according to a specific proportion, the liquid crystal monomer RM257 provides an acrylate group, the chain extender provides a thiol group, the cross-linking agent provides vinyl, and the proportion of the acrylate group, the thiol group and the vinyl is regulated by regulating the proportion of the liquid crystal monomer, the chain extender and the cross-linking agent, so that the phase transition temperature of the prepared liquid crystal elastomer prepolymer is influenced, and the phase transition temperature of the prepared liquid crystal elastomer prepolymer is reduced. And finally obtaining the liquid crystal elastomer fiber with lower driving temperature. The driving temperature of the intelligent fabric is low, and the intelligent fabric is suitable for the human body surface.

This invention provides a difluoroterminated alkenyl liquid crystal compound, its preparation method, and its application. The difluoroterminated alkenyl liquid crystal compound has the structure shown in the general formula P. The alkenyl-terminated liquid crystal compound of this invention has a large response speed, a large refractive index, a clearing point, and a wide phase transition temperature. Its synthesis method has a high yield, simple post-processing, and is suitable for industrial production.

The invention provides an aerosol generating device which is provided with at least two atomizers, the first atomizer is used for atomizing a first solution, the first solution is provided with a first solvent system, the second atomizer is used for atomizing a second solution, and the second solution is provided with a second solvent system. The first solvent system is different from the second solvent system, and the heating atomization temperature T1 of the first atomizer, the phase change temperature B1 of the first solution, the heating atomization temperature T2 of the second atomizer and the phase change temperature B2 of the second solution meet the following relation: (T1-B1)-(T2-B2) > 0 DEG C. By adopting the scheme, the two atomizers can be respectively controlled to generate aerosols with different particle sizes, and the particle size control accuracy of the aerosols is improved.

A kind of porosity controllable additive manufacturing method of nickel-manganese-tin-cobalt alloy and application of the obtained product.The present application belongs to the field of solid refrigeration.The present application aims at the intrinsic brittleness of nickel-manganese-tin-based alloy,which is difficult to be processed into complex-shaped parts by traditional casting and numerical control processing,limiting its application.Meanwhile,aiming at the problem that the existing additive manufacturing method is easy to produce residual stress and element segregation,which affects the structural integrity and magnetic heat performance of the alloy.The present application uses water-based binder to carry out layer-by-layer spray forming of alloy powder,then adds deoxidizer and manganese powder,and carries out high-temperature sintering under vacuum condition to obtain nickel-manganese-tin-cobalt alloy with controllable porosity.The method of the present application effectively avoids the oxidation of the sample,so that the sample maintains good magnetic-structural characteristics,and obtains nickel-manganese-tin-based alloy with specific porosity,phase transition temperature interval near room temperature,and magnetic heat performance comparable to that prepared by traditional method,which shows broad application prospects in the field of magnetic refrigeration and other fields.

The invention provides a constant-temperature battery, application and an implantable medical device, and relates to the technical field of medical devices. The constant-temperature battery is characterized in that a temperature-sensitive hydrogel layer is grown on the surface of a battery shell in situ, temperature-sensitive hydrogel of the temperature-sensitive hydrogel layer has biocompatibility, and the phase change temperature is 36-39 DEG C. The temperature-sensitive hydrogel with biocompatibility and the phase change temperature of 36-39 DEG C grows on the surface of the battery shell in situ, when the temperature of the battery exceeds the phase change temperature, the hydrogel absorbs heat in a phase change mode, and when the temperature of the battery is lower than the phase change temperature, the hydrogel releases heat in a phase change mode, so that the overall constant temperature is maintained, and the service life of the battery is prolonged. When the battery is used as a power supply of an implantable medical facility, the battery can adapt to the temperature of a human body, does not cause overheating of peripheral tissues, can also adapt to actual use environment adjustment requirements, and can be widely applied to the field of implantable medical instruments.

The invention relates to the use of a structure for passive thermoregulation. The structure is formed of a material having a phase transition temperature TC, and the phase transition may be an insulator to metal phase transition, or an insulator to semi-metal phase transition. The thermal emissivity ε of the structure at a wavelength λ is greater at a temperature exceeding TC than at a temperature below Tc. The structure has a characteristic length Lc, and the surface area:volume ratio of the structure is greater than 10 / Lc.

A method for measuring phase transition temperature using electrical conductivity, comprising: preparing a graph of change in conductivity of molten salts according to temperature, and performing at l