141results about How to "Facilitate phase transition" patented technology

The invention discloses a phase-change energy-storage material nanocapsule and a preparation method thereof and particularly relates to a phase-change energy-storage material capsule using an inorganic material as a shell layer and a preparation method of the capsule. By dispersing an oil phase formed by mixing the phase-change energy-storage material and tetraethyl orthosilicate in an aqueous phase formed by water and ethanol in a shape of nanoscale droplets, carrying out hydrolysis-condensation reaction on tetraethyl orthosilicate in the presence of a basic catalyst, and forming a silicon oxide shell layer on the surface of each of oil phase droplet to coat the phase-change energy-storage material, thus obtaining the phase-change energy-storage material nanocapsule of which the particle size is less than 1mu m. The nanocapsule has the advantages of uniform particle size distribution, large surface area and high enthalpy of phase change. The preparation method is simple and feasible, is high in preparation yield and is conductive to prepration of the phase-change energy-storage material having high heat storage/release efficiency in a large scale.

The invention discloses a recipe and a preparation method of a high-voltage gradient zinc oxide resistance card. The recipe of the zinc oxide resistance card of the invention reasonably and preferably adopts the ingredients and the contents of the zinc oxide resistance card, the zinc oxide resistance card prepared by the recipe has the high-voltage gradient as high as 350 to 600v/mm, and at the same time, under the high-voltage gradient, the zinc oxide resistance card can maintain good nonlinear characteristic, electrical property and ageing-resistant characteristic to meet the miniaturization requirement of electronic components such as lightning protectors in practical application. In the preparation method of the zinc oxide resistance card of the invention, the accessory ingredients and trace ingredients in the zinc oxide resistance card have fine granularity, are matched, and are uniformly mixed, the impurity mixing quantity is reduced, at the same time, because the low-temperature heat-insulation process is added in the sintering process, the zinc oxide resistance card forms a stable crystal boundary structure which is favorable for improving the stability of the zinc oxide resistance card and the phase change of the bismuth oxide in the secondary heat treatment process, so the electrical property of the zinc oxide bismuth oxide can be improved.

The porous silicon nitride ceramic is prepared with C and CO2 in 75-95 wt%, silicon nitride 1-10 wt%, and sintering assistant 2-20 wt%. The C/CO2 weight ratio is 0.4-0.6; and the sintering assistant is at least one the metal oxides Y2O3, Al2O3 and MgO. The preparation process includes the following steps: ball milling the materials, drying and sieving to obtain mixture powder; pressure forming in mold; and sintering in a nitrogen atmosphere furnace through raising temperature at the rate of 600deg.c/hr to 1500deg.c, further raising temperature at the rate of 180deg.c/hr to 1700-1800deg.c, and maintaining at nitrogen pressure of 6-10 atm for 2-8 hr to obtain the sintered body. The porous silicon nitride ceramic may be used as base filter material for separating gas in high temperature and corrosive atmosphere, heat resisting material and reinforcing material in gas turbine, engine, space shuttle, etc.

This invention relates to a phase-transformation storage unit and its preparation method charactering in covering a lower electrode layer on the substrate, covering a heat insulation material layer with holes on the lower electrode layer, and the holes contain a hollow column heating electrode material structure conducting to the lower electrode, a heat insulation material layer covers the column heating electrode and contains holes matched to the heating electrode and an inverse phase-transformation material layer covered by a heat insulation material layer with holes is contained in the electrode holes and the holes of the insulation material layer, and the upper electrode material is filled in the holes of the heat insulation layer conducting to the phase-transformation material, which limits the phase-transformation material in the holes in the hollow post and the insulation material to keep the phase-transformation material to be transformed first at the environment high temperature and high pressure when electric pulse operates a storage unit.

Provided is a strongly correlated oxide field effect element demonstrating a phase transition and a switching function induced by electrical means. The strongly correlated oxide field effect element is a strongly correlated oxide field effect element 100 including a channel layer 2 constituted by a strongly correlated oxide film, a gate electrode 14, a gate insulating layer 31, a source electrode 42, and a drain electrode 43. The channel layer 2 includes an insulator-metal transition layer 22 of a strongly correlated oxide and a metallic state layer 21 of a strongly correlated oxide that are stacked on each other. The thickness t of the channel layer 2, the thickness t1 of the insulator-metal transition layer 22, and the thickness t2 of the metallic state layer 21 satisfy the following relationship with critical thicknesses t1c and t2c for respective metallic phases of the layers: t=t1+t2≧t1c>t2c, where t1<t1c and t2<t2c.

The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a 5182-0 aluminum alloy sheet preparation method for automobiles. Aluminum alloy raw materials are preparedfrom the components in percentage by mass: namely 0.01-0.08% of Si, 0.15-0.30% of Fe, 0.01-0.1% of Cu, 0.10-0.30% of Mn, 4.5-5.0% of Mg, less than or equal to 0.1% of Cr, less than or equal to 0.05%of Zn, less than or equal to 0.1% of Ti, less than or equal to 0.1% of Ni, less than or equal to 0.05% of a single impurity, less than or equal to 0.15% of total, and the balance of Al. Aluminum alloycoils cold rolled to intermediate pass in cold rolling process are annealed and insulated at 320 DEG C for 2 h, wherein the annealing process of finished aluminum alloy coils is passed in a single layer mode in a continuous air cushion annealing furnace, the coils are blown to suspend in the furnace through hot air, and the problems that most parts of the local deformation of aluminum alloy sheets are cracked during the stamping deformation due to the uneven inner grain structure of aluminum alloy sheets prepared by existing aluminum alloy sheet preparation process are solved.

The invention provides a biomorphic silicon carbide ceramic high-temperature photo-thermal storage material and a preparation method thereof. The heat storage material is prepared by compounding a biomorphic silicon carbide ceramic framework and chlorate. The biomorphic silicon carbide ceramic is a ceramic material generated by high-temperature reaction of molten silicon and a charcoal porous precursor, and silicon carbide ceramic frameworks with different porosities can be obtained by different wood precursors. The phase-change heat storage material is prepared by fully and uniformly mixing sodium chloride and potassium chloride in a ball mill and drying to obtain the sodium-potassium chloride eutectic salt. The biomorphic silicon carbide ceramic framework is coated with the phase changeheat storage material by adopting a vacuum impregnation method, so that pores of the ceramic framework are filled with the phase change material, thereby obtaining the biomorphic silicon carbide ceramic high-temperature photo-thermal storage material. The composite material prepared by the invention has the excellent characteristics of high thermal conductivity (116 W/mK), high spectral absorptionperformance (92%) and high heat storage density (453 kg/kJ), and is expected to promote the development of constructing a clean, low-carbon, efficient and safe energy system.

The invention provides a high strength thermoplastic polyurethane solid-solid phase change energy storage material and a preparation method thereof. The high strength thermoplastic polyurethane solid-solid phase change energy storage material is prepared from 30-42 parts by weight of polybutylene succinate diol, 43-52 parts by weight of polyethylene glycol, 12-23 parts by weight of isophorone diisocyanate, 5-12 parts by weight of hexamethylene diisocyanate, 3-8 parts by weight of a chain extender, 0.05-0.2 parts by weight of a catalyst and 0.01-0.1 parts by weight of modified nanometer silica particles. The number-average molecular weight of the polybutylene succinate diol is in a range of 7000-8500 and the number-average molecular weight of polyethylene glycol is in a range of 6000-8000. Ingredients of the phase change energy storage material produce synergism so that the phase change energy storage material has good mechanical properties, material tensile strength greater than 36MPa and a fracture percentage elongation greater than 921%. The preparation method has simple processes and a wide application range.

In aspects of the invention, a strongly correlated nonvolatile memory element is provided which exhibits phase transitions and nonvolatile switching functions through electrical means. In an aspect of the invention, a strongly correlated nonvolatile memory element is provided including, on a substrate, a channel layer, a gate electrode, a gate insulator, a source electrode, and a drain electrode. The channel layer includes a strongly correlated oxide thin film, and is formed of a perovskite type manganite which exhibits a charge-ordered phase or an orbital-ordered phase; the gate insulator is formed in contact with at least a portion of a surface or interface of the channel layer and is sandwiched between the channel layer and the gate electrode, and the source electrode and drain electrode are formed in contact with at least a portion of the channel layer.

The invention relates to a method for preparing a shape-stabilized phase change material by using acrylic fiber waste silks. The method comprises the following steps of: hydrolyzing the acrylic fiber waste silks into alkali liquid, obtaining an acrylic fiber hydrolysis product through ethanol precipitation, and then swelling and dissolving the acrylic fiber hydrolysis product; and mixing and reacting the acrylic fiber hydrolysis product and a mixture of polyethylene glycol, chain extender, catalyst and solvent to obtain a graft copolymer of the acrylic fiber hydrolysis product and the polyethylene glycol, wherein the graft copolymer has the solid-solid phase change characteristic. The shape-stabilized phase change material prepared by the method has the advantages of high heat enthalpy value, excellent thermal stability, simple preparation method, low cost, reclamation and recycle of the solvent and the like; and the method is a technique capable of realizing resource reutilization, energy conservation and environmental protection, and has broad market application space.

The invention relates to a sub-temperature carburizing heat treatment method for reducing heat treatment deformation of a thin-wall gear. The method comprises the following steps of S1, pre-sub-temperature normalizing; S2, slow speed shot blasting; S3, sub-temperature carburization, specifically, gradient heating is adopted to a sub-temperature carburizing temperature, a two-stage carburizing method is adopted in the sub-temperature carburizing process, the first stage is a strong carburizing stage, and the second stage is a diffusion stage; S4, gradient slow cooling quenching, specifically, firstly, gradient slow cooling is carried out on a carburized thin-wall gear forging to 840-860 DEG C, heat preservation is carried out for about 1h, then the slow cooling is continuously carried out to 815-825 DEG C, the heat preservation is carried out for about 1h, the carbon potential in the furnace is controlled to be 0.5-0.05%, and then quenching is carried out in a polyvinyl alcohol solution; and S5, low-temperature tempering. According to the method, the deformation degree of a gear workpiece can be greatly reduced, the production qualification rate can be obviously improved, meanwhile,crystal grains can be effectively refined, the hardness and strength of a gear can be improved, the service life of the gear can be obviously prolonged, and in addition, the refined crystal grains can obviously improve the carburizing speed, reduce the process time and reduce the energy consumption.

The invention discloses a rolling process of improving a 38CrMoAl steel rolling state structure. The rolling process is characterized by comprising the following steps of 38CrMoAl steel blank selection, steel blank heating, steel blank rough rolling, steel blank medium rolling, steel blank finish rolling and steel cooling. The rolling process of improving the 38CrMoAl steel rolling state structurehas the following advantages that a relatively low final rolling temperature is controlled, so that the surface temperature of a rolled piece is lower than a temperature of a core portion in the process, the steel core portion obtains a relatively large compressive stress in the rolling process, the structure uniformity is greatly improved, and crystal grains are further refined; the final rolling temperature is lowered to be close to the actual critical phase change point Ar3, a phase change from gamma to alpha is promoted, and a nucleation site of ferrite is increased, so that a structure morphology of a product is ferrite and pearlite structures in a balanced state; and the rolling process is green and environmentally friendly, does not pollute the environment, is capable of lowering the cost and increasing the benefit and particularly has important significance of controlling the online structure and the performance of medium-low carbon alloy structural steel.

The invention relates to high-carbon high-chromium martensitic stainless steel for a cutter and a preparation method thereof, and belongs to the technical field of materials. The high-carbon high-chromium martensitic stainless steel comprises the following chemical components of, in percentage by weight, 0.90%-1.20% of C, 14.0%-16.0% of Cr, 1.0%-2.0% of Co, 0.5%-1.5% of Mo, 0.20%-0.40% of V, 0.2%-0.6% of Mn, 0.001%-0.01% of La, less than 0.01% of P, less than 0.01% of S and the balance iron. The preparation method of the high-carbon high-chromium martensitic stainless steel comprises the following steps of burdening, smelting, casting molding, forging and hot working, cold working and heat treatment. According to the high-carbon high-chromium martensitic stainless steel for cutter and thepreparation method thereof, the rare earth element content in the material is optimized, primary carbide coarsening is inhibited, carbide uniform distribution is promoted, the heat treatment process is improved, the martensite content and the austenite content in a matrix are controlled, and the optimal matching of the strength and the toughness of the material is obtained.

The invention relates to a composite phase-change energy storage material and a preparation method thereof. The composite phase-change energy storage material is composed of the following components in percentage by mass: 80-95% of calcium chloride hexahydrate, 1.5-15% of phase separation inhibitor and 0-5% of nucleator. The preparation method of the composite phase-change energy storage material comprises the following steps: weighing equal mass of anhydrous calcium chloride and water, and stirring until the anhydrous calcium chloride is completely dissolved, thereby obtaining a first solution; adding the nucleator into the first solution, and stirring to obtain a second solution; and adding the phase separation inhibitor into the second solution, and stirring to obtain the liquid composite phase-change energy storage material. By using the calcium chloride hexahydrate as the phase-change material, the energy storage material has low degree of supercooling, can still keep the phase change complete after repeated circulations, has high energy storage rate, and is more suitable for practical application.

The invention relates to the technical field of lithium-sulfur battery conductive agents, and in particular relates to a lithium-sulfur battery conductive agent based on a nano transition metal phosphide/carbon composite material as well as a preparation method and application of the lithium-sulfur battery conductive agent. The conductive agent comprises a conductive agent body and nano transitionmetal phosphide particles growing on the conductive agent body in situ, and the conductive agent body is a conductive carbon material. According to the invention, the conductive nano transition metalphosphide is compounded on the conductive carbon material to form the lithium-sulfur battery conductive agent with a new structure; the conductive performance of the lithium-sulfur battery conductiveagent is superior to that of a traditional conductive agent, shuttling of polysulfide can be effectively prevented, and a certain catalytic effect is generated; due to the existence of the catalyticaction of the transition metal phosphide, the reaction time of converting soluble lithium polysulfide into a liquid state in the charging and discharging process can be effectively shortened, and nucleation of lithium polysulfide is accelerated; the charging and discharging rate of a positive electrode material is increased; the utilization rate of active substances of the positive electrode material is increased; and the specific capacity and the cycling stability of the lithium-sulfur battery are improved.

The invention discloses a 2.3 GPa strength grade Co-Ni-Cr-based alloy and a preparation method thereof. The alloy comprises the following components of, in percentage by mass, 42%-45% of Co, 30%-33% of Ni, 18%-21% of Cr, 0.8%-1.2% of W, 1.8%-2.2% of Mo, 0.3%-0.7% of V and 0.15%-0.3% of C. The preparation method of the alloy comprises the steps of casting, homogenization treatment, solution treatment, cold deformation treatment and aging heat treatment. The tensile strength of the alloy can reach 2.30 GPa or above, the alloy has certain plasticity, the preparation process is simple, and the alloy can be produced through conventional casting and cold and hot machining processes.

The invention relates to a rolling method capable of reducing an as-rolled hardness of 42CrMo steel. The rolling method comprises the following steps: (1) carrying out heating treatment on a blank of the 42CrMo steel; and (2) sequentially carrying out rough rolling, medium rolling and finish rolling on the treated blank of the 42CrMo steel to obtain the 42CrMo steel with a low as-rolled hardness. The rolling method capable of reducing the as-rolled hardness of the 42CrMo steel, which is disclosed by the invention, has the following beneficial effects: 1. a low finish rolling temperature is controlled, a high pressure stress on the core part of the steel is achieved during a rolling process, structure uniformity is greatly improved, and grains are further refined; and 2. the finish rolling temperature is lowered to be approximate to an actual critical phase change point (Ar3), thus phase change of the 42CrMo steel from phase gamma to phase alpha is promoted, finally an as-rolled structure is a balanced ferrite and pearlite structure, and then the as-rolled hardness is reduced to HB230-250 from HB300.

The invention relates to a tabular sodium bismuth titanate/polyvinylidene fluoride composite material and a preparation method thereof. The method comprises the following steps: step 1, calcining Na2CO3, Bi2O3, TiO2 and NaCl at 900-1100 DEG C for 2-8 h; step 2, removing Cl- in an obtained mixture A, drying and then grinding uniformly; step 3, adding an ethanol solution, then drying, adding dopamine hydrochloride and hydrochloric acid, reacting and then drying a product to obtain dopamine-coated tabular sodium bismuth titanate powder; step 4, adding the dopamine-coated tabular sodium bismuth titanate powder into a solution prepared from polyvinylidene fluoride, preparing a compound of the tabular sodium bismuth titanate powder and polyvinylidene fluoride through a tape casting method, and drying to obtain a compound A; step 5, drying the compound A and then quenching; the composite material is maintained at relatively high breakdown field strength, and has large energy density under thesame breakdown field strength compared with pure polyvinylidene fluoride.

The invention belongs to the technical field of steel, and particularly relates to cold forging gear steel and a preparation method thereof. The gear steel is prepared from the following chemical components in percentage by mass: 0.15%-0.25% of C, 0.05%-0.40% of Si, 0.30%-1.40% of Mn, 0-0.03% of P, 0-0.035% of S, 0.80%-1.50% of Cr, 0-0.05% of Ti, 0-0.045% of Al, 0-0.15% of Cu, 0-0.0150% of N and the balance Fe and inevitable impurities. The metallographic structure of the gear steel comprises austenite, and the grain size of the austenite is 6-7 grades. The gear steel meets gear performance, and has low hardness in a hot rolling state, and the problem of large cold deformation resistance of conventional gear steel is solved; through reduction of the contents of Si and Mn elements, and the cold deformation resistance of a gear steel blank is reduced, and meanwhile the problem of local coarse grains is solved.

The invention relates to high-performance low-carbon Mo-containing bainite steel and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps of adding Mo into smelting components of Fe-C-Mn-Si low-carbon steel, smelting in vacuum, casting into a steel billet, and rolling the steel billet into a plate; heating the rolled plate to 880-900 DEG C at the heating speed of 5-10 DEG C/s, and keeping the temperature for 10-20 minutes; cooling to 410-420 DEG C by water, cooling to 340-350 DEG C by air, and keeping the temperature for 30-40 minutes; cooling to room temperature by water to prepare the high-performance low-carbon Mo-containing bainite steel. The high-performance low-carbon Mo-containing bainite steel comprises the following chemical components: 0.15wt%-0.22wt% of C, 1.48wt%-1.55wt% of Si, 1.95wt%-2.04wt% of Mn, 0.14wt%-0.15wt% of Mo, less than 0.008wt% of P, less than 0.002wt% of S, less than 0.004wt% of N and the balance of Fe and inevitable impurities. The preparation method has the characteristics of low cost, short cycle and simple process; the prepared high-performance low-carbon Mo-containing bainite steel is excellent in comprehensive performance.

The invention discloses a preparation method of a two-dimensional porous hexagonal metal oxide nanosheet composite material and application of the composite material in a potassium ion battery, and belongs to the technical field of preparation of potassium ion battery composite negative electrode materials. Key points of the technical scheme of the method are as follows: MnO is taken as an examplefor explanation; a MnCO3 NHSs precursor is firstly prepared by utilizing a hydrothermal method; then, a hydrolysis method is used for obtaining a MnCO3@a-TiO2 NHSs intermediate product; then, calcination is performed in a weak reducing atmosphere to introduce oxygen vacancy defects into the nanometer crystals to finally prepare the MnO@a-TiO2-Vo NHSs composite material. The composite material prepared by the method shows excellent rate capability and cycle performance when being used as a negative electrode material of a potassium ion battery, so that the composite material has a relatively good application prospect in the potassium ion battery.