72 results about "Ternary eutectic" patented technology

The invention discloses a controllable preparation method for the eutectic phase size of a medium-aluminum type zinc-aluminum-magnesium coating, which comprises the following steps of: preparing the following components in percentage by weight: 0.01 to 0.08 percent of C, less than or equal to 0.03 percent of Si, 0.15 to 0.26 percent of Mn, 0.15 to 0.26 percent of P, less than or equal to 0.01 percent of S, 0.02 to 0.06 percent of Als, less than or equal to 0.3 percent of Ti and the balance of Al; the base material is subjected to annealing treatment, zinc plating treatment and post-plating treatment after multiple working procedures, and the plating layer with the ternary eutectic structure morphology is obtained. Through optimization of base material components, the galvanizing process and the cooling process, accurate control over the eutectic phase size in the plating layer is achieved, and therefore the corrosion resistance, the adhesive force and the uniformity of the plating layer are improved.

The invention discloses a low-viscosity ternary eutectic solvent as well as a preparation method and application thereof, and belongs to the technical field of CO2 absorbents. The low-viscosity ternary eutectic solvent is composed of polyamine hydrochloride, steric hindrance amine and organic alcohol, the polyamine hydrochloride has multiple active amino groups and is used for guaranteeing the high CO2 absorption rate and absorption load of the ternary eutectic solvent, the steric hindrance amine can inhibit formation of a hydrogen bond network due to the unique steric hindrance structure, and the high CO2 absorption rate and absorption load of the ternary eutectic solvent are improved. The organic alcohol can be used as a viscosity regulating agent, active hydroxyl of the organic alcohol can promote proton transfer in a CO2 desorption reaction, and the CO2 desorption efficiency is enhanced. The ternary eutectic solvent provided by the invention can still maintain a low-viscosity homogeneous liquid state after absorbing CO2, can effectively reduce the reduction of mass transfer efficiency caused by high viscosity, influence on contact with a target compound, heat transfer efficiency and the like, and solves the ubiquitous problems of overhigh viscosity and insufficient regeneration efficiency of the existing DESs system.

The invention discloses a method for synergistically extracting flavonoid compounds in epimedium wushanense by combining a ternary eutectic solvent with in-situ ultrasound, which is characterized in that choline bitartrate-urea-glycerol (Chb: Ure: Gly) is used as the ternary eutectic solvent, and the flavonoid compounds in epimedium wushanense are synergistically extracted by the in-situ ultrasound. The method is high in extraction speed and good in repeatability, solvent consumption can be reduced, operation steps are simplified, and efficiency is improved.

A Zn—Al—Mg-based hot-dip plated steel sheet includes a hot-dip plated layer formed on a surface of a steel sheet, in which the hot-dip plated layer contains, as an average composition, Al: 5 to 22 mass % and Mg: 1.0 to 10 mass %, with a remainder including Zn and impurities, and in a case where a 5 mm square cross section parallel to a surface of the hot-dip plated layer is exposed at any position of a 3t / 4 position, a t / 2 position, and a t / 4 position from the surface with a thickness of the hot-dip plated layer represented by t, a ratio (B / A (%)) of an area fraction B of a [Zn phase] to a total area fraction A of a [Zn phase] and an [Al / MgZn2 / Zn ternary eutectic structure] of a plating microstructure in at least one cross section is 20% or more.

The application discloses a kind of preparation methods of multi-component photocuring composite ceramic, by adding tetraethyl orthosilicate in multi-component ceramic powder, obtain modified ceramic powder, then it is mixed with photosensitive resin prepolymer, dispersing agent, diluent, photo initiator uniformly, subsequently sequentially through DLP photocuring 3D printing, debinding, sintering after obtaining composite ceramic.The application utilizes the hydrolysis condensation characteristics of tetraethyl orthosilicate, makes it react on the surface of different ceramic powder, uniformly coats silica layer, can improve the phenomenon of curing uneven caused by the difference of refractive index, absorbance and reaction sensitivity of powder;The layer has low refractive index, can also solve the problem of insufficient curing depth of non-oxide ceramic.In addition, during sintering, the silica layer forms Y-Ce-Si-O ternary eutectic system with CeO2 and Y2O3, reduces the initial temperature of liquid phase, further promotes sintering densification, provides a feasible scheme for composite ceramic, high-entropy ceramic 3D printing.

A hot-dip plated steel sheet includes a hot-dip plated layer formed on a steel sheet. An absolute value of a difference in an area fraction of a first region between a pattern portion and a non-pattern portion is 30% or more. A cross section parallel to a surface is exposed at any position of 3t / 4 position, t / 2 position, or t / 4 position from the surface of the hot-dip plated layer, virtual lattice lines are drawn on each of the cross sections, a region in which a proportion of an area fraction B of a [Zn phase] to a total area fraction A of the [Zn phase] and an [Al / MgZn2 / Zn ternary eutectic structure] is 20% or more in each of a plurality of regions partitioned by the lattice lines is defined as the first region, and a region in which the proportion is less than 20% is defined as the second region.

The invention discloses a preparation method of a melon-phase single crystal carbon nitride photocatalyst for visible light driven full water decomposition, and belongs to the technical field of photocatalytic material preparation. The preparation method comprises the following steps: firstly preparing prepolymerized melon phase carbon nitride, then reacting the prepolymerized melon phase carbon nitride with ternary eutectic point molten salt to synthesize partially deaminated melon phase carbon nitride, and then carrying out heat treatment on the partially deaminated melon phase carbon nitride under a vacuum condition, thereby synthesizing the single crystal melon with a triclinic crystal phase for the first time. The process is simple, the cost is low, the material is non-toxic and harmless, the actual production requirement is met, the obtained melon-phase single crystal carbon nitride can prolong the exciton diffusion length by means of high crystallinity, it can be ensured that the charge migration distance is smaller than the exciton diffusion length, and therefore bulk phase recombination is effectively inhibited, and therefore the melon-phase single crystal carbon nitride is used for visible light driven photocatalytic full decomposition of water for hydrogen production, and the hydrogen production efficiency is improved. The efficiency can be improved by nearly two orders of magnitude, and the method has great application potential.

The invention discloses a preparation method of a transition metal ion doped eutectic crystal, and relates to the technical field of eutectic crystals. Doping the transition metal ions into the eutectic crystal for growth; wherein the transition metal ions are chromium ions or cobalt ions, and the eutectic crystal body is a binary eutectic crystal body Al2O3-Y3Al5O12 or a ternary eutectic crystal body Al2O3-Y3Al5O12-ZrO2; transition metal ion chromium or cobalt is doped in Al2O3-Y3Al5O12 or Al2O3-Y3Al5O12-ZrO2 to respectively form red and blue colored eutectic crystals, and the color gradient from light red and blue color to dark red and blue color is formed by regulating and controlling the ion concentration of chromium or cobalt.

The invention relates to a high-strength heat-resistant aluminum alloy and a preparation method and application thereof, and belongs to the technical field of alloy preparation, and the preparation method comprises the following steps: S1, smelting: putting raw materials containing an aluminum element, a cerium element, a nickel element, a zirconium element and a calcium element into a smelting furnace, heating and melting, and uniformly stirring to obtain an alloy melt; s2, refining and degassing: adding a refining agent into the alloy melt, uniformly stirring, and then refining for multiple times to obtain an aluminum melt; s3, standing and slagging-off are conducted, specifically, a fluxing medium is evenly placed on the surface of the aluminum melt, slagging-off is conducted, and the pure aluminum melt is obtained; s4, pouring the test bar: pouring the pure aluminum melt through a mold; the alloy room temperature strength and high temperature resistance are well matched through a multi-element eutectic phase, and the Al-Ce-Ni series alloy of a ternary eutectic structure composed of alpha-Al, Al-Ce (Ca) and Al-Ni phases is prepared.

The invention discloses a composite molten salt system and an adsorption method for efficiently adsorbing SO2 and CO2 gas in the oxidation process of nuclear-grade cation exchange resin, and belongs to the field of high-temperature heat treatment of solid wastes. According to the method, magnesium oxide is added on the basis of a ternary eutectic carbonate system, absorption of the molten salt to SO2 and CO2 generated in the nuclear-grade cation exchange resin molten salt oxidation treatment process is enhanced, pollution of sulfur-containing gas can be reduced, and carbon emission in the reaction process can also be reduced. The added magnesium oxide can react with CO2 and SO2 in a chemical adsorption manner to generate MgCO3 and MgSO4. MgO is added, so that the alkalinity of the system can be increased, and further oxidation of the resin is promoted. In conclusion, due to the addition of MgO, the content of gas products generated by complete oxidation of C and S elements in the tail gas is reduced while effective oxidation of the waste resin is realized.

The invention provides preparation of a ternary organic eutectic and application of the ternary organic eutectic in photocatalysis. The molecular formula of the ternary organic eutectic crystal P-TS-TC is (Pyrene) 0.1 (TSB) 0.9 (TCNB), Pyrene is pyrene, TSB is trans-1, 2-stilbene, and TCNB is 1, 2, 4, 5-benzene tetraacetonitrile. The preparation method of the P-TS-TC comprises the following steps: dissolving pyrene, TSB and TCNB in an acetonitrile solvent, and naturally volatilizing the acetonitrile solvent to obtain the orange-yellow P-TS-TC single crystal. The ternary eutectic prepared by the invention has a charge transfer state (CT state), so that the light absorption range of the ternary eutectic has obvious red shift compared with three monomer molecules pyrene, TSB and TCNB. And meanwhile, the energy levels of the three monomer molecules are arranged in a gradient manner, so that hole transfer in P-TS-TC can be effectively promoted, and the CT state delocalization in the eutectic can be regulated and controlled. Compared with binary organic eutectic crystals P-TC and TS-TC, the ternary organic eutectic crystal P-TS-TC prepared by the preparation method disclosed by the invention has longer carrier life and higher photocatalytic water splitting hydrogen production performance.

The application belongs to the technical field of hydrometallurgy, and particularly relates to a ternary eutectic solvent and application thereof in separating lithium and transition metals in a lithium battery leaching solution. The ternary eutectic solvent is obtained by mixing propylcaine, lauric acid and tributyl phosphate according to a molar ratio of 1:1.5:(0.5-2). The method for separating lithium and valuable metals in waste ternary lithium batteries by using the ternary eutectic solvent comprises the following steps: (1) taking the ternary eutectic solvent as an organic phase, adding the lithium battery leaching solution into the organic phase for extraction, and centrifuging to separate phases, so as to obtain a nickel-cobalt-manganese loaded organic phase and a lithium-containing raffinate; and (2) adding a stripping agent into the nickel-cobalt-manganese loaded organic phase for back extraction, and centrifuging to separate phases, so as to obtain a nickel-cobalt-manganese stripping solution and a regenerated organic phase. The separation method has excellent selective extraction effect.

The invention discloses a ternary eutectic electrolyte for a zinc ion battery as well as a preparation method and application of the ternary eutectic electrolyte, and belongs to the technical field of zinc ion batteries. The electrolyte is composed of zinc perchlorate hydrate, acetamide and dimethyl sulfoxide according to a specific molar ratio, and the preparation method comprises the steps that the zinc perchlorate hydrate and the acetamide are mixed and stirred to form transparent liquid, then the dimethyl sulfoxide is added, stirring continues to be conducted, and the uniform and transparent eutectic electrolyte is formed. Through the ternary eutectic system design, the zinc ion coordination environment is effectively regulated and controlled, the obtained electrolyte is low in viscosity and high in ionic conductivity, when the electrolyte is applied to a zinc ion battery, zinc dendrite growth and side reaction can be remarkably inhibited, the cycle life of a Zn | | Zn symmetric battery under 1 mA cm <-2 > exceeds 3800 hours, the capacity retention rate of a Zn | | PANI total battery after 500 cycles under 0.5 A g <-1 > reaches 99.8%, and the capacity retention rate of the Zn | | PANI total battery under 0.5 A g <-1 > reaches 99.8%. And the cycle stability and the service life of the battery are greatly improved.

The invention discloses a preparation method of deep-eutectic solvent-based nano lignocellulose composite aerogel, and belongs to the technical field of biomass nano cellulose aerogel preparation. Lignin and nanocellulose components are separated from peanut shells by utilizing a ternary eutectic solvent, the eutectic solvent is combined as a component of the aerogel, and chitosan and polyvinyl alcohol are added, so that the composite aerogel with excellent performance is prepared. The preparation method is simple, the mechanical performance and the structural performance of the composite aerogel are remarkably improved on the basis that the eutectic solvent is combined with the nanocellulose and / or the lignin to serve as components of the aerogel, and a basis is provided for application of the aerogel in various fields due to the excellent performance of the aerogel. Meanwhile, the used deep-eutectic solvent is green and environment-friendly, the nano lignocellulose also meets the standard of green chemical production, and a new thought is provided for high-value utilization of the deep-eutectic solvent nano lignocellulose and preparation of a multifunctional gel material.

The application discloses a ternary eutectic solvent, a hybrid self-lubricating material, a polymer self-lubricating composite material and a preparation method thereof. The raw materials of the ternary eutectic solvent include choline chloride, oxalic acid dihydrate and 1-hexadecyl-3-methyl imidazole bromide; wherein the amount of choline chloride is 25-30 parts, the amount of oxalic acid dihydrate is 35-40 parts, and the amount of 1-hexadecyl-3-methyl imidazole bromide is 0.5-1.0 parts in terms of the weight fraction ratio. The application initiatively synchronously pretreats lignocellulose and two-dimensional materials by using ternary DES (choline chloride / oxalic acid dihydrate / ionic liquid crystal), solves the core problems of poor dispersibility of lignocellulose and agglomeration of two-dimensional materials from the source by using the interfacial activity of ionic liquid and the deconstruction ability of DES, and realizes efficient activation of biomass raw materials.

This invention relates to a method for preparing maleic acid, belonging to the field of organic chemistry. The method includes the following steps: mixing choline chloride, propylene glycol, and malonic acid to obtain a eutectic solvent; adding furfural and a titanium-silicon molecular sieve catalyst to the eutectic solvent under a microwave-ultrasound composite field atmosphere, followed by the dropwise addition of an oxidant to carry out a catalytic oxidation reaction, thereby obtaining maleic acid. Compared with existing technologies, this invention, for the first time, constructs a reaction system using a ternary eutectic solvent of choline chloride-propylene glycol-malonic acid and a titanium-silicon molecular sieve catalyst, while simultaneously enhancing the mass and heat transfer processes within the reaction system through the application of an externally applied microwave-ultrasound composite field of appropriate power, thereby improving the yield of the target product, maleic acid, and overcoming the shortcomings of existing technologies such as low product yield, providing a new technical means for the preparation of maleic acid.

A hot-dipped galvanized steel sheet of the present invention includes: a base steel sheet; a Zn—Mg—Al based plating layer provided on at least one surface of the base steel sheet and including, in wt %, with respect to components other than iron (Fe) diffused from the base steel sheet, 5.1 to 25% of Al and 4.0-10% of Mg, and the remainder of Zn and other inevitable impurities; and an interfacial alloy layer having a Fe—Al—Zn composition formed between the base steel sheet and the plating layer, wherein the interfacial alloy layer has a thickness of 0.5-2 μm and has a dendritic form, the Zn—Mg—Al based plating layer has a Zn—Al—MgZn2 ternary eutectic structure, a Zn—MgZn2 binary eutectic structure, and a structure including one or more of an Al single-phase structure having solid-solubilized Zn and a Zn single-phase structure, and agglomerated Al is included in a MgZn2 structure.

The invention discloses a method for improving the obdurability of a Zn-2. 7Mg alloy by using an aluminum element, and the problem that the toughness of the Zn-2. 7Mg alloy is relatively low is solved by adding Al particles in the smelting process of the Zn-2. 7Mg alloy. And the Al content is controlled to be 3% or below, the alloy melting point is low, the melt viscosity is moderate, and the die-casting alloy requirement can be met. By adding the Al element, solid solution strengthening can be generated, the plasticity and toughness of the alloy can be improved, grains can be refined, segregation of Mg can be reduced, and therefore the uniformity of the alloy is improved. In the smelting process, the aluminum element and the magnesium element are added at a proper time, the oxidation burning loss of zinc and magnesium can be reduced, more ternary eutectic structures and a small amount of aluminum phases are obtained in the zinc alloy, and therefore the obdurability of the alloy is improved. Along with the increase of the addition amount of the aluminum element, the primary zinc phase in the zinc alloy is continuously reduced and refined, and the ternary eutectic and the aluminum phase are gradually increased, so that the strength, plasticity and toughness of the die-cast zinc-magnesium alloy can be remarkably improved.

Provided is a Zn-Al-Mg-Si-based plated steel sheet which has excellent chemical conversion treatability, suppressed swelling under a coating film, and corrosion resistance to a dissimilar metal joint. A Zn-Al-Mg-Si plated steel sheet according to the present invention has a base steel sheet and a plating layer formed on at least one surface of the base steel sheet, and is characterized in that the plating layer has a Zn-Al-MgZn2 ternary eutectic structure and a composition containing, in mass%, 0.50-3.00% of Mg, 0.10-3.00% of Al, 0.010-0.20% of Si, and 0.30% or less of Fe, with the remainder being Zn and unavoidable impurities, and in that the plating layer has a Zn-Al-Mg-Si ternary eutectic structure. In a backscattered electron image having a magnification of 5000 times obtained using a scanning electron microscope at an acceleration voltage of 7.0 kV, in a ternary eutectic structure, needle-like Mg2Si alloy phases are present in a number density of less than 100,000 / mm2, and needle-like Mg2Si alloy phases are present in a number density of at least 500 / mm2 when the same operation is performed at an acceleration voltage of 15.0 kV, and the number density of the needle-like Mg2Si alloy phases is less than 100,000 / mm2 when the same operation is performed at an acceleration voltage of 15.0 kV, and the number density of the needle-like Mg2Si alloy phases is less than 100,000 / mm2. The number density of the needle-like SiO2 oxide phases is more than 100000 / mm < 2 >.

The application relates to a preparation method of a niobium titanium oxide / liquid metal composite negative electrode material and application of the niobium titanium oxide / liquid metal composite negative electrode material in a low-temperature lithium ion battery, and belongs to the field of secondary batteries. The method is as follows: TiNb2O7 microspheres are synthesized, SnO2 is deposited on the surface of the TiNb2O7 by adopting an atomic layer deposition technology and taking SnCl4 and H2O as precursors, and TNO@Sn material is obtained through hydrogen reduction; TNO@Sn powder, Super P and PVDF are uniformly mixed in a solvent to prepare a slurry, the slurry is coated on a copper foil current collector, and an electrode sheet is obtained through rolling; Ga-In-Sn ternary eutectic liquid metal is prepared, the liquid metal is uniformly sprayed on the surface of the electrode sheet in an Ar atmosphere glove box, the Ga-In-Sn liquid metal / TiNb2O7 composite negative electrode is prepared in a "cold welding" mode, the interface bonding force between the liquid metal and the active particles is enhanced through an alloying reaction, the composite process temperature is reduced, and the damage of high temperature to the material is avoided. Meanwhile, the flowability, self-healing and high conductivity of the liquid metal compensate for and enhance the ion / electron transmission deficiency of the TiNb2O7 composite electrode at low temperature, and high safety is ensured.

The invention provides a silicon-based brazing filler metal and a connecting method of SiC and SiCf / SiC, and relates to the technical field of welding, and the silicon-based brazing filler metal comprises the following components in percentage by mole: 2.3%-8.3% of Ti, 2.3%-8.3% of Zr, 2.3%-8.3% of Hf and the balance of Si. The silicon-based brazing filler metal is ternary eutectic silicon-based brazing filler metal composed of titanium (Ti), zirconium (Zr), hafnium (Hf) and silicon (Si) in a specific proportion, and the silicon-based brazing filler metal is located in a Si-rich near-eutectic interval by controlling the total mole fraction of metal elements in the silicon-based brazing filler metal. The silicon-based brazing filler metal provided by the invention is used for connecting silicon carbide and a silicon carbide fiber reinforced silicon carbide ceramic-based composite material, and a welding joint with relatively high strength can be obtained.

The application discloses a method for preparing nanocellulose by treating bamboo shoot shell through a eutectic solvent, and comprises the following steps: S1, configuration of the eutectic solvent: after uniformly mixing a first component, a second component and a third component, the mixture is heated and stirred to obtain a ternary eutectic solvent; S2, configuration of a cosolvent: after uniformly mixing benzyl tripropyl ammonium hydroxide, 1'3-bishydroxymethyl urea and water, the mixture is heated and stirred to obtain the cosolvent; S3, preparation of nanocellulose: after mixing pretreated bamboo shoot shell, the ternary eutectic solvent and the cosolvent, the mixture is heated and stirred, after the reaction is completed, the mixture is washed with water, filtered, dried, and the obtained crude cellulose is configured into a suspension, and then ultrasonic treatment, high-pressure homogenization and freeze-drying are carried out to obtain nanocellulose. The nanocellulose obtained through the method has a high yield (88.36%), a high proportion of cellulose (90.19%) and a size of 58.78 nm.

The application relates to the field of batteries and discloses a solid-state electrolyte precursor and a lithium metal battery. The solid-state electrolyte precursor is characterized in that the solid-state electrolyte precursor comprises a ternary eutectic solvent, an ether monomer, a fluorine ether diluent and a lithium salt; the ternary eutectic solvent comprises lithium bistrifluoromethylsulfonylimide, a Lewis acid and a Lewis base; and the molar ratio of the lithium bistrifluoromethylsulfonylimide and the Lewis acid is 1:0.01-5. The solid-state electrolyte precursor contains a specific ternary eutectic solvent, a lithium metal battery containing a deep eutectic solid-state electrolyte obtained by in-situ polymerization of the solid-state electrolyte precursor has good interface stability, the generation of lithium dendrites is inhibited, the lithium metal cycle stability is high, and the safety performance is more excellent.

The invention discloses a signal connector and a preparation method thereof, and the signal connector comprises a contact substrate which is provided with a micropore structure with a high length-width ratio; the Fe-Ga-Cu ternary eutectic nano-magnetic layer is arranged on the surface of the contact substrate and is used for generating mechanical vibration and generating an acoustic signal under the excitation of an external alternating magnetic field; and the noble metal plating layer is arranged on the surface of the Fe-Ga-Cu ternary eutectic nano-magnetic layer and is used for ensuring the conductivity and contact reliability of signal transmission. According to the invention, non-destructive in-situ detection and accurate control of the thickness distribution of the noble metal layer in the micropore structure with a high length-width ratio are realized, the technical problem that the thickness of the noble metal layer in the micropore is not uniform and is difficult to detect in the traditional preparation process is solved, and the reliability and the service life of the signal connector are remarkably improved.

The application provides a biomass-based composite heterostructure hydrogen evolution catalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalytic decomposition hydrogen evolution catalysts. Biomass cellulose is prepared by treating biomass as raw material through a ternary eutectic solvent, cobalt is loaded on carbon cloth, a three-dimensional network Co@NCNT / CC carrier is prepared by combining microwave calcination, and the biomass-based composite heterostructure hydrogen evolution catalyst is prepared by preparing cobalt molybdate, and then carrying out a hydrothermal reaction on the cobalt molybdate, thiourea and the carrier. The catalyst takes Co@NCNT / CC as a three-dimensional carrier, grows petal-shaped CoS2@MoS2 heterojunction on the surface, and forms an efficient charge transport channel through Mo-S-Co bonds. The catalyst has excellent catalytic activity, reaction kinetics, structural stability and acid-base tolerance, the process is green and sustainable, and is suitable for industrial application of water electrolysis hydrogen production.

This plated steel material is a plated steel material including: a steel material; and a plating layer disposed on a surface of the steel material, wherein the plating layer has a predetermined average chemical composition, in a cross section of the plating layer perpendicular to the surface of the steel material, a microstructure observed with a scanning electron microscope includes, in terms of area fraction, a MgZn2 phase: 10% or more and 50% or less, a total of an Al phase, an Al—Zn phase, and a Zn—Al phase: 15% or more and 75% or less, a [ternary eutectic structure of Al / MgZn2 / Zn]: 0% or more and 65% or less, and the remainder: 0% or more and 5.0% or less, and an area ratio (([Al]+[Zn—Al]) / [Al—Zn]) of a total of the Al phase and the Zn—Al phase to the Al—Zn phase is 0.8 or more.

The invention discloses a double-rare-earth-doped magnesium-based hydrogen storage alloy and a preparation method thereof, relates to the technical field of hydrogen storage alloys, and solves the problems that an existing magnesium-based hydrogen storage material is limited in hydrogen storage capacity and slow in hydrogen absorption and dehydrogenation rate. The alloy comprises 68.8-91 wt.% of Mg, 5-15 wt.% of Ni, 2-8 wt.% of Y, 2-8 wt.% of Eu, and the balance of Fe and unavoidable impurities. The material is composed of an alpha-Mg phase, an LPSO phase, a Mg2Ni phase and a Mg17Eu2 phase, wherein Mg2Ni, Mg17Eu2 and part of alpha-Mg form a ternary eutectic structure. The magnesium ingot, the magnesium-nickel alloy, the magnesium-yttrium alloy and the magnesium-europium alloy are placed in a smelting crucible, protective atmosphere is introduced, and the melt is heated to 700-750 DEG C and stirred to be melted; and cooling to 680-700 DEG C, casting to obtain an alloy ingot, and crushing to obtain alloy powder. The method can be used in hydrogen energy storage and transportation, fuel cells, new energy automobiles, distributed energy systems, aerospace and other hydrogen energy related fields needing efficient hydrogen storage.

The plated steel material is a plated steel material having a steel material and a plated layer, the average chemical composition of the plated layer containing Al: 0.2% to less than 4.0%, Mg: more than 4.0% to less than 12.5%, Ca: 0.15% to less than 3.00%, Zn: 65% or more, and impurities, the metal structure in any of the perpendicular sections (thickness direction) of the plated layer contains, in terms of area fraction, MgZn2 phase: 10 to 40%, Al-Zn phase: 0 to 15%, Al phase (Zn < 10%) phase: 0 to 5%, CaZn 13 phase: 1.0 to 15%, and the total of the [Al / MgZn2 / Zn ternary eutectic structure] and the [MgZn2 / Zn binary eutectic structure]: 30% or more.

The application provides a method for extracting piperine in piper longum, comprising the following steps: defatting the crushed piper longum to obtain defatted piper longum powder, mixing the defatted piper longum powder with a ternary eutectic solvent, performing ultrasonic extraction, filtering and centrifuging to obtain supernatant, performing multiple extraction on the supernatant, combining the extraction liquid to obtain a piperine extraction liquid, wherein the ternary eutectic solvent comprises choline chloride-lactic acid-ethylene glycol or choline chloride-lactic acid-1,2-propanediol. The application combines the optimal eutectic solvent system screened out with the ultrasonic extraction technology, and the extraction rate of piperine in piper longum is measured to be as high as 9.42%, which provides a new idea for efficient extraction of piperine in piper longum and high-value conversion of piper longum resources.

The invention discloses a middle layer for Al-rich magnesium alloy welding. The middle layer comprises an aluminum layer and silver layers distributed on the two sides of the aluminum layer. The invention further discloses a welding method of the Al-rich magnesium alloy, which comprises the following steps of: placing the middle layer between two Al-rich magnesium alloys, pressing, and carrying out TLP welding. The intermediate layer forms an Mg-Al-Ag ternary eutectic system through element mutual diffusion of an Ag-Al interface, the problem that a brittle Mg17Al12 phase is easily generated by a single Al layer is avoided, the defect that a joint is discontinuous due to liquid phase loss of a single Ag layer is also overcome, and the strength of a welded joint is improved; and moreover, the temperature field is regulated and controlled by stages through a double-temperature process, so that the sufficiency of interface reaction is ensured, excessive loss of a liquid phase is inhibited, a uniform and continuous Mg-Al eutectic framework structure is formed in a joint solidification area, and the strength of a welded joint is further improved.