8 results about "Dendrite (metal)" patented technology

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 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.

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 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.