55 results about "Dendrite (metal)" patented technology

Disclosed herein are various methods of forming copper-based conductive structures on integrated circuit devices by performing a copper deposition process to fill the trench or via with copper, which can be performed by fill, plating or electroless deposition. Copper clearing of copper overburden is performed using CMP to stop on an existing liner. Copper in the trenches or vias is recessed by controlled etch. An Nblok cap layer is deposited to cap the trenches or vias so that copper is not exposed to ILD. Nblok overburden and adjacent liner is then removed by CMP. Nblok cap layer is then deposited. The proposed approach is an alternative CMP integration scheme that will eliminate the exposure of copper to ILD during CMP, will prevent any dendrite formation, can be used for all metal layers in BEOL stack, and can be utilized for multiple layers, as necessary, whenever copper CMP is desired.

The invention provides a composite material of metal zinc foil and zinc- affinity crystal nucleuses and a preparation method and application thereof. The preparation of the composite material includesthe steps that metal salt solution is prepared as deposition solution, the metal zinc foil is placed in the deposition solution, and the composite material is obtained after in-situ chemical deposition. The volume of the zinc-affinity crystal nucleuses is smaller, thin crystal nucleuses can evenly cover the surfaces of the zinc foil, the unique structure can effectively inhibit zinc dendrite, furthermore, due to the fact that the thickness of the crystal nucleuses covering the surfaces of the zinc foil is comparatively thin, the zinc electrode reaction surface area is further maintained at alarge extent, so that the adverse impact on zinc negative electrode materials by modification can be prevented, and the circulating performance of a battery can be improved greatly.

The invention belongs to the technical field of metal materials, and particularly relates to a preparation method of a high-strength and high-toughness CrCoNi medium-entropy alloy homogeneous fine-grain thin plate. The preparation method comprises the five steps of vacuum smelting, alloy ingot annealing, hammer cogging and drawing-out and high-temperature back-and-forth rolling forming. Accordingto hammer cogging and drawing-out, upsetting and drawing-out forging treatment is carried out on an annealed alloy cast ingot to prepare a plate blank; and the upsetting rate is 50-200 mm/s, and the drawing-out forging ratio is 2-10. According to the method, hammer cogging and drawing-out treatment is carried out after annealing, a large number of dendrites in an as-cast structure can be completely broken through severe plastic deformation in a short time, a fine and uniform grain structure is obtained, and metallurgical defects such as pores and looseness are reduced; and a high-temperature back-and-forth rolling process method is adopted, the grain size and the structure are refined, the strength, plasticity and toughness of materials are improved, and the anisotropy problem of an CrCoNimedium-entropy alloy is obviously reduced.

A method for inhibiting zinc dendritic crystal growth by using a polydopamine film comprises the steps: a zinc foil is soaked in a dopamine solution, and a polydopamine film layer is formed on the surface of zinc by adjusting the concentration of dopamine, the pH value of the solution, the polymerization time and the reaction temperature; the dopamine-modified zinc foil is used as the negative electrode of the secondary battery, and structural characterization after charge-discharge circulation shows that the surface of the electrode is smooth, and no obvious dendritic crystal is generated; and the polydopamine has strong metallophilicity, a stable protective layer is formed on the surface of the zinc foil, and the deposition of zinc is limited in a limited space, so that the growth of zinc dendrites is effectively inhibited, and the cycle life of the zinc negative electrode is prolonged. The method disclosed by the invention is simple in process, easy in reaction condition control, environment-friendly and beneficial to performance optimization and practical application of the zinc negative electrode.

The invention discloses application of a metal dendritic crystal inhibition additive, an electrolyte containing the same and a battery. The dendritic crystal inhibition additive provided by the invention is used as an additive of an electrolyte of a metal-based battery. The additive comprises a compound with an electrophilic group in a molecular structure or capable of dissociating organic cationsin the electrolyte. The metal-based battery containing the metal dendritic crystal inhibiting additive is provided, in the charging process of the battery, electrophilic groups in the additive or organic cations dissociated after being dissolved in electrolyte can be adsorbed on the small bulges on the surface of a metal negative electrode under the action of electrostatic force, and metal ions are prevented from being deposited on the small bulges, so that the growth of dendrites is inhibited, the service life of the battery is prolonged, and the coulombic efficiency of the battery is improved.

The invention discloses a dendrite-free alloy negative electrode with a solid-liquid phase conversion mechanism and a preparation method of the dendrite-free alloy negative electrode. The dendrite-free alloy negative electrode comprises liquid alloy and a three-dimensional skeleton which is compatible with the liquid alloy and has a porous structure. The three-dimensional skeleton with a porous structure is used as a carrier of the liquid alloy and a supporting body of the electrode. The pores of the three-dimensional skeleton with a porous structure are filled with the liquid alloy, and the liquid alloy is in full contact with the three-dimensional skeleton with a porous structure, so that the alloy negative electrode with solid-liquid phase conversion is formed. By designing the alloy negative electrode with a solid-liquid phase conversion mechanism, the phase conversion process from a solid phase to a liquid phase and then to the solid phase can be realized in the charge-discharge process, so that the problem of lithium dendrites in the cycle process of a secondary alkali metal battery is solved, and the cycle stability and safety of the battery are improved.

The invention discloses a method for reducing metal dendrites in manganese electrodeposition, which comprises a direct-current power supply, a circuit system, electrodes and an electrolytic bath. A circuit is added to a manganese metal electrolysis device, the amplitude and frequency of electrochemical oscillation in the manganese metal electrolysis process can be effectively reduced, the chaos state of an electrolysis system is weakened, the current density is homogenized, and therefore generation of cathode metal dendrites is restrained.

The invention discloses a simulation method for predicting the solidification process of a vacuum consumable melting cast ingot, and relates to the technical field of vacuum consumable arc melting. The simulation method comprises the following steps: establishing a mathematical model related to an electromagnetic field and a flow field, carrying out mesh generation on a geometric model, adopting an Eulerian-Eulerian method, setting three phases: molten metal, equiaxed dendrites and columnar crystals, and obtaining related material attributes; setting relevant boundary conditions and relevant dynamic grid parameters, and simulating flowing and solidification of molten metal in the vacuum consumable arc melting process and distribution of an electromagnetic field and a solidification structure. According to the method, the rising process of the molten pool and the solidification process of the cast ingot in the vacuum self-consuming arc melting process are simulated, the flowing form of the molten metal in the solidification process is obtained, the capacity of predicting macrosegregation of the cast ingot is achieved, and the method plays an important guiding role in optimizing the vacuum self-consuming arc melting process to obtain the cast ingot with uniform components; and the method is of great significance to actual production.

The invention discloses a Laves phase eutectic alloy with high strength, high hardness and high thermal stability and a preparation method of the Laves phase eutectic alloy. The preparation method comprises the following steps that 1, high-purity metal raw materials are polished and cleaned, and proportioning is conducted according to chemical components Cr-22.93 Fe-53.68 Nb (at.%); and 2, the metal raw materials are sequentially put into a water-cooled copper crucible of a non-consumable electric arc melting furnace according to the sequence that the melting points are from low to high, the vacuum degree of a furnace body is increased to 3 * 10 <-3> Pa to 6 * 10 <-3> Pa, high-purity argon is introduced, the air pressure in the furnace is controlled to be 0.05 Pa, and in an electric arc melting process, an alloy ingot is turned over and remelted five times to obtain an eutectic alloy product. According to the eutectic alloy, in a microscopic structure, a full eutectic Laves phase/Nbss phase is arranged in dendrites, a full eutectic Laves phase/mu phase/Nbss phase is arranged among the dendrites, the eutectic alloy has high strength, high hardness and high thermal stability, meanwhile, low-cost Fe is adopted for replacing Cr, the material cost is low, the manufacturing process is simple, rapid and efficient, the eutectic alloy has the advantages of being small in crystallization temperature interval, good in fluidity, small in component segregation and the like, and is suitable for preparing large-size high-quality components with uniform components and structures.

A method of removing salt from a dendritic mixture includes loading the dendritic mixture into a mechanical press system. The dendritic mixture includes a metallic dendrite and salt dispersed within the metallic dendrite. The dendritic mixture is heated to liquefy the salt without volatilizing one or more metals of the metallic dendrite. The dendritic mixture is also compressed to obtain a fluidic mixture and an ingot of the metallic dendrite. The fluidic mixture may include molten salt and residual metallic dendrite. The fluidic mixture may be filtered to separate the residual metallic dendrite from the molten salt.

The invention provides a method for calculating the stress of forced convection on AlN dendrites in the molten steel solidification process in the field of metallurgy, and relates to the field of metallurgy. The method comprises the following steps: firstly collecting steel grade components and solidification conditions; secondly calculating heat transfer and mass transfer in the solidification process, growth of interface cells in the solidification process and nucleation and growth of AlN in the solidification process, and further establishing an AlN precipitation model in Fe-C-Al-N quaternary alloy solidification; according to the continuous casting process conditions such as casting temperature, solute components and cooling rate, predicting the precipitation rule through the established AlN precipitation model, displaying the precipitation position, size, shape and size of AlN in a data imaging mode through data analysis and visual processing software, and quantifying the AlN precipitation number. According to the prediction method for the precipitation situation of the AlN inclusions in the molten steel solidification process, the theoretical guidance is provided for optimizing the solidification technology, controlling the size of the AlN inclusions in steel and improving the quality of a casting blank.

The invention discloses a method for measuring dendritic crystal spacing of a chalcogenide free-cutting steel continuous casting billet, and belongs to the technical field of metal material detection.The method comprises the following specific steps and parameters: firstly, cleaning, grinding and polishing a sample, and then putting into an electron microscope for analysis; then carrying out automatic statistical analysis on the non-metallic inclusions; adjusting the current of the probe to enable the dead time of the free-cutting steel sample under the electron beam to reach 20-30%; and thelike; carrying out closed operation image processing to obtain an inclusion distribution diagram spliced by all fields of view, screening according to elements and content information of the inclusiondistribution diagram, and judging the inclusion with the S content of more than or equal to 0.1 percent and the Mn content of more than or equal to 0.1 percent as manganese sulfide inclusion; obtaining a manganese sulfide inclusion distribution diagram; and finally, averaging more than or equal to 10 positions to obtain a final measurement value of the secondary dendrite spacing. The method has the advantages that the method is simple and convenient, the measured dendrite spacing value is accurate, the analysis scanning areas can be continuously spliced, and the measurement area is more than100mm < 2 >.

A method for producing a metal structure comprising a porous inter-dendritic matrix defining a network of dendritic channels, the method comprising the steps of: preparing an alloy melt comprising a metal element and at least one alloying element, cooling the alloy melt to a solid alloy, wherein the cooling promotes formation of a network of dendrites rich in the at least one alloying element within an inter-dendritic matrix rich in the metal, dealloying the solid alloy to remove alloying element from the dendrites and the inter-dendritic matrix to obtain the metal structure.

The invention relates to a cell for metal electrowinning equipped with a device useful for preventing the adverse effects of dendrite growth on the cathodic deposit. The cell comprises a porous conductive screen, positioned between the anode and the cathode, capable of stopping the growth of dendrites and avoiding that they reach the anode surface.