16 results about "Dendrite (metal)" patented technology

The invention relates to the technical field of metal casting, and discloses a smelting and casting method of a high-toughness regenerated aluminum alloy, which comprises the following steps: measuring the iron content of a regenerated aluminum melt, regulating and controlling the manganese-iron ratio, heating the melt to 750-790 DEG C, and carrying out overheating treatment to eliminate a hereditary core; cooling to 630-645 DEG C, applying a mechanical shear flow field with the average shear rate not lower than 60s <-1 > in the interval, stripping a diffusion boundary layer on the surface of the iron-rich phase crystal nucleus by utilizing fluid drag force, breaking dendritic crystals, and separating out in a polyhedral or spherical manner; according to the method, through active intervention of a critical shear flow field, the problem of needle-like growth of an iron-rich phase caused by solute diffusion blocking in a traditional technology is solved, in-situ generation of the harmless iron-rich phase in the high-iron-content secondary aluminum is achieved, the obdurability of a die casting is improved, and dependence on the purity of raw materials is reduced.

The application discloses a carbon carrier material for relieving sodium dendrite growth, rich in micropores and closed pore structure, and a preparation method and application thereof, and belongs to the technical field of low-dimensional material energy storage devices. The preparation method comprises the following steps: SO1, cross-linking reaction of a phenol source, a cross-linking catalyst and a formaldehyde solution; SO2, obtaining an impurity-containing sample through a high-temperature carbonization reaction; and SO3, adding the impurity-containing sample into a solvent for soaking, suction filtration, washing and drying to obtain the carbon carrier material. The carbon carrier material prepared by the application is uniformly distributed, the selection and pore size of the pores are adjustable, can effectively provide rich sodium-philic sites for inducing uniform deposition of sodium, and can inhibit the dendrite growth of a sodium metal battery in a cycle process; the pores serve as three-dimensional Na + Transmission channels are beneficial to forming a good ion migration path, reducing the current density of a local material, reducing the possibility of forming dendrites, and improving the safety and service life of the energy storage device.

This invention provides a zinc foil surface treatment method for inhibiting dendrite growth, comprising: immersing a zinc foil with ultrasonically cleaned surface in an acidic mixture to obtain a zinc foil with a preferred zinc (002) crystal facet under acid etching; immersing the zinc foil with the preferred zinc (002) crystal facet in a mercaptosilane coupling agent solution, and through hydrolysis, forming a nanostructured zinc-silane composite layer on the zinc foil surface; and drying the zinc foil with the zinc-silane composite layer to obtain a zinc foil that can inhibit dendrite growth. The zinc foil surface treatment method for inhibiting dendrite growth described in this invention can generate a zinc-silane composite layer and zinc with (002) crystal facet orientation on the zinc foil surface. This composite layer has a strong zinc ion adsorption capacity, which can improve ion kinetics, promote uniform zinc plating and peeling, and the preferred (002) crystal facet can induce parallel growth of zinc metal and resist electrolyte corrosion, thereby effectively inhibiting zinc dendrites and stabilizing the electrode / electrolyte interface.

The application discloses a preparation method of dendrite-free gel electrolyte and application thereof, and comprises the following steps: synthesizing a porphyrin-based covalent organic framework (PPCOF); preparing a gel precursor solution; and preparing an in-situ polymerized PMMA-based gel electrolyte. The electrolyte has the characteristics of simple preparation method, cheap and easily available raw materials, good electrode interface contact (in-situ polymerization), and the like, and can solve the problems of poor PMMA-based GPE electrode contact, low lithium ion transference number and easy growth of lithium dendrites, thereby providing guidance for the development of dendrite-free solid-state lithium metal batteries.

The disclosed concept relates to lithium-ion and lithium-metal batteries including methods of preparing a multi-component alloy (MCA) system having a body-centered cubic (bcc) crystal structure as a negative electrode and current collector, where the lithium-ion or lithium-metal battery is dendritic-free throughout the charging and discharging process of the battery. The MCA system includes an alloy composition of (i) 40 at% iron, 40 at% aluminum or gallium, and 20 at% magnesium, or (ii) 10 at% iron, 40 at% aluminum or gallium, and 50 at% magnesium, or (iii) 50 at% iron, 40 at% aluminum or gallium, and 10 at% magnesium.

The application provides a method for calculating stress of nitride dendrites under forced convection in a steel liquid solidification process, and relates to the technical field of metal solidification. The composition of the steel grade and the involved thermodynamic and kinetic parameters and complex F-H boundary conditions are collected. The free boundary condition is added to the right side along the x direction velocity, and the stress growth model of Fe-C-M-N quaternary alloy steel in the flow field is established by coupling D2Q9 and cellular automaton model. Finally, the visual processing module is used to analyze the shape, size and flow field distribution of the nitride dendrites during solidification. The application optimizes the solidification technology, predicts the stress analysis of the nitride dendrites under forced convection, and provides theoretical guidance for improving the quality of the casting blank.

The invention relates to the technical field of precious metal purification, and discloses an automatic control method and system for a precious metal purification process. The method comprises the following steps: constructing a quadrant acoustic monitoring coordinate system to obtain a real-time acoustic energy vector, establishing an acoustic energy entropy increase coordinate system, defining an entropy increase polygon, and executing a multi-stage judgment mechanism to output an entropy increase directivity report; starting an optical information conversion mechanism to generate an optical shadow map, converting the optical shadow map into a resistance value distribution map by using a photoresistor array, and executing a gating gain modulation rule to output a local suppression field instruction; and formulating a directional intervention strategy based on the report, constructing a resonance cooperative shielding mechanism, and realizing dendritic crystal removal through a reverse current pulse and sine cleaning pulse sequence. According to the method, the problems of local dendritic crystal risk perception lag and extensive intervention in electrolytic refining are solved, self-organization growth of dendritic crystals is effectively blocked through acousto-optic fusion monitoring and grading synergistic inhibition, and the product purity and the process stability are remarkably improved.

The invention discloses an intelligent method for rapidly measuring dendritic crystal thickness and lamellar spacing in a metal material, and the method comprises the steps: carrying out the preprocessing of a neodymium iron boron rapid hardening sheet, obtaining a flat and smooth cross section, collecting a BSE image through a scanning electron microscope, and marking the dendritic crystal thickness and dendritic crystal lamellas, and obtaining a training data set; an image segmentation network U-Net is built, training is carried out by using the training set, evaluation is carried out by combining the verification set, and a feature recognition extraction model is obtained; based on the structural characteristics of dendritic crystal lamellas, a measurement algorithm of the dendritic crystal thickness and the lamellar spacing is constructed by combining various methods; and acquiring a back scattering electron image of a sample to be measured, inputting the back scattering electron image into the feature recognition extraction model to obtain a binarization segmentation result, and outputting a quantization result of the dendritic crystal thickness and the lamellar spacing through a constructed measurement algorithm. According to the method, machine learning, image processing and mathematical statistics technologies are combined, rapid characterization of the thickness, the spacing and the distribution of the branch wafer layer in the metal material is realized, and the method has the characteristics of accuracy, automation and rapidness.

The present application relates to a kind of high corrosion resistance high-aluminum zinc-aluminum magnesium silicon coating steel plate and its manufacturing method, in coating, in the multi-component phase of aluminum-zinc dendrite gap, according to the total area occupied by aluminum-zinc dendrite gap: MgZn2 intermetallic compound accounts for 10%~20%, Mg2Si intermetallic compound accounts for 2%~5%, Zn-Al-Mg ternary eutectic structure accounts for more than 60%.The present application aims to improve the surface and edge corrosion resistance of high-aluminum zinc-aluminum magnesium silicon coating steel plate.By component optimization and process parameter setting, form reasonable coating organization and form, further improve the corrosion resistance of coating.

The application relates to the technical field of alloy materials, in particular to a corrosion-resistant and impact-resistant alloy material and a processing technology thereof. The Y-La-Ce ternary rare earth is used for synergistic modification, alloy bath deep deoxidization and desulfurization and high-efficiency purification of grain boundary impurities are realized, and the segregation of harmful elements such as S, P and O at the grain boundary is significantly reduced. The application also adopts a whole-process process synergistic regulation and control of high-temperature rolling, grading aging and low-temperature stress relief. The high-temperature rolling can crush the as-cast dendrite, eliminate the loose shrinkage and realize the densification of the structure. The grading aging can accurately control the size and distribution of the nano precipitated phase, balance the strength and toughness and stabilize the grain boundary structure. The low-temperature stress relief annealing can completely release the residual stress generated in the rolling and aging processes, avoid the cracking in subsequent processing and service deformation, guarantee the size stability and structure uniformity of the material, has strong process compatibility, can be directly adapted to the existing metallurgical production line, realizes the stable mass production of large-size plates and bars, and is high in production efficiency and controllable in cost.

The disclosed concept relates to lithium-ion and lithium metal batteries comprising methods of preparing multi-component alloy (MCA) systems with body-centered cubic (bcc) crystal structures as anodes and current collectors, wherein the lithium-ion or lithium metal battery is dendrite free throughout the charge and discharge processes of the battery. The MCA systems include the following alloy compositions: (i) 40 atom % iron, 40 atom % aluminum or gallium, and 20 atom % magnesium, or (ii) 10 atom % iron, 40 atom % aluminum or gallium, and 50 atom % magnesium, or (iii) 50 atom % iron, 40 atom % aluminum or gallium, and 10 atom % magnesium.

The invention discloses a nano lanthanum oxide modified Inconel 625 nickel-based superalloy and a preparation method thereof, and belongs to the technical field of metal additive manufacturing and superalloy materials.La2O3 particles with the particle size being 30-50 nm and Inconel 625 alloy powder with the particle size being 53-105 [mu] m are evenly dispersed through a ball-milling powder mixing technology, and then the nano lanthanum oxide modified Inconel 625 nickel-based superalloy is prepared through laser directional energy deposition forming; wherein the addition amount of La2O3 particles is 0.3 wt.%-0.9 wt.%, and the addition of a proper amount of La2O3 can promote grain refinement of a gamma-Ni matrix in the solidification process, relieve segregation of Nb / Mo among dendritic crystals and remarkably reduce formation of Laves phases and MC carbides, so that a microscopic structure is more uniform, the tensile strength and the ductility are both superior to those of a control sample without addition of La2O3, and synergistic improvement of strength and toughness is achieved. The method has the advantages of being small in addition amount, simple in process and remarkable in performance improvement, and a new technical approach is provided for structure regulation and performance optimization of the nickel-based high-temperature alloy in the field of additive manufacturing.

3D-printed metal objects with large-size cubic crystal structures are produced by controlling the infill distance and molten pool depth. A molten pool is moved within a first powder layer along a first scan pattern to create a first patterned layer. The scan pattern has parallel scan lines spaced apart by an infill distance along an infill direction perpendicular to the scan lines. As the molten pool cools, dendrites grow in their dendrite growth direction. This infill distance promotes dendrite growth in directions orthogonal to the scan lines and suppresses dendrite growth in directions with a directional component opposite to the infill direction. A second patterned layer is created by moving the molten pool within a powder layer on top of the first patterned layer. The pool depth suppresses dendrite growth in the first patterned layer at an angle of less than 45 degrees relative to the top surface of the molten pool.

The application belongs to the technical field of single crystal alloy preparation, and particularly relates to a method for ultrasonic-assisted preparation of single crystal alloy. The application introduces an ultrasonic-induced sound field and flow field in a directional solidification process, effectively controls the solute boundary layer thickness near a solidification interface, successfully realizes controllable conversion of high-temperature alloy from cellular crystal to steady-state dendrite under columnar crystal conditions, and significantly refines dendrite primary arm spacing. The application breaks through the limitation of traditional directional solidification on solidification structure size, provides a new technical path for preparation of high-performance high-temperature alloy, and comprehensively improves the application performance of metal materials.

The application provides a preparation method of TC4 alloy and relates to the field of metallurgy. The preparation method comprises the following steps: ingredients are prepared according to the Ti-6Al-4V ratio, the ingredients are uniformly mixed, and then the ingredients are pressed into electrode blocks, vacuum plasma welding is performed, and a consumable electrode is obtained; after furnace centering, first, second and third vacuum arc melting is sequentially performed, and a TC4 alloy ingot is obtained after cooling; the first vacuum arc melting and the second vacuum arc melting perform arc starting stage control and stable melting stage control, and the third vacuum arc melting performs arc stage control, stable melting stage control and hot sealing stage control. The preparation method of the TC4 alloy provided by the application controls the stable melting pool morphology in the stable melting stage, reduces the melting pool depth, provides good conditions for the solidification of the ingot, ensures the smooth operation of the melting pool in the melting stage and the hot sealing stage, makes the liquid phase temperature and the composition uniform, reduces the dendrite spacing, and improves the uniformity of the ingot.

The application discloses a method for improving slab segregation, and belongs to the technical field of continuous casting. The method comprises the following steps: performing dynamic pressing on a slab with the mass fraction of Ni being greater than or equal to 3%, wherein the pressing amount is 0.5-3 mm when the slab is in the interval of fs=1.0-1.1. According to the method, dynamic light pressing is performed on the slab of high-nickel steel in the interval of fs=1.0-1.1 during continuous casting, and the pressing amount is controlled to be 0.5-3 mm, so that the molten metal of the slab can be fully pressed into the peripheral dendrites near the position of one fourth and three fourths, solute redistribution is realized, shrinkage holes are pressed together, the segregation and porosity problems of the slab of high-nickel steel near the position of one fourth and three fourths are reduced, and the internal quality of the slab of high-nickel steel is improved.