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479results about How to "Uniform tissue" patented technology

Method for preparing aluminum foil for lithium battery

The invention relates to a method for preparing an aluminum foil for a lithium battery and belongs to the technical field of machining of aluminum alloy materials. The method for preparing the aluminum foil for the lithium battery includes the steps of performing smelting and cast rolling processes: heating and smelting raw materials of the aluminum foil for the lithium battery to form an aluminum alloy melt, sequentially carrying out refining slagging-off, grain refining, degassing deslagging and filtration treatment and subjecting the filtered aluminum alloy melt to continuous cast rolling to form a blank; performing a cold rolling process: subjecting the blank to cold rolling firstly and then to primary annealing treatment, rough rolling and secondary annealing treatment; performing foil pressing treatment: carrying out finish rolling on the annealed aluminum foil, and finally slitting the foil to obtain the aluminum foil finished product for a lithium battery finished product. According to the method for preparing the aluminum foil for the lithium battery, composition segregation in the process of alloy cast rolling is improved through added uniform annealing treatment; an original cast rolling structure is improved so that the product with uniform constituents and structure and stable performances can be obtained; moreover, the performances of the aluminum foil for the lithium battery can be improved.

Alloy ingot for automotive hub and production method thereof

The invention discloses an alloy ingot for an automotive hub and a production method thereof. The alloy ingot comprises the following components: 6.8-7.2% of Si, 0.28-033% of Mg, 0.10-0.15% of Ti, 0.015-0.030% of Sr, less than or equal to 0.10% of Fe, less than or equal to 0.05% of Mn, less than 0.01% of zinc, less than 0.01% of Cu, less than 0.003% of Ca, less than 0.002% of P, less than 0.02% of other single impurity content, less than 0.1% of total impurity content and the balance of aluminum. The production method of the alloy ingot for the automotive hub comprises the following steps of: adding 3303 industrial metallic silicon and electrolytic aluminum liquid for batching, heating at an appropriate temperature and melting, spreading a covering agent so as to reduce oxidation slagging, stirring so that the industrial metallic silicon rapidly melts, keeping uniform temperature, slagging off, keeping melt clean, spraying powder and refining by adopting high-purity N2 and a refined powder spraying agent, controlling the temperature of a smelting furnace to 740-750 DEG C, adding Al-Sr alloy to aluminium water, carrying out secondary degassing and slagging-off by adopting a powder spraying refinement method, filtering to remove slag, and casting the alloy ingot in line with requirements. The alloy ingot obtained by the method has the advantages of stable and uniform components, compact structure and clean surface; and the production method is the best production method for producing the A356.2 alloy ingot for the low-iron high-end automotive hub.

Method for preparing ultra-fine crystal grain tungsten-copper alloy and tungsten-copper alloy

A method to prepare ultra-fine grain tungsten-copper alloy and the tungsten-copper alloy, it belongs to powder metallurgy technology field. The solution of concentrated HNO3 and solution of Cu (NO3)2 will be added into the solution of (NH4)2WO4 at the condition that they are blended, the chemical deposition reaction will occur in the agitator. And then the deposit will be burned and grinded to produce the composite powder of tungsten-copper oxidate. The composite powder will be reduced at low temperature in the pipe furnace, and nanometer tungsten-copper composite powder can be gained, and then they will be pressed to take shape, the pressed compact will be sintered at the protection of H2 and ultra-fine grain tungsten-copper alloy can be gained. The weight percent of copper in a kind of tungsten-copper alloy produced according to the above method is 20%, the relative density of the alloy is 98.0%-99.7%, the average crystal grain size of the tungsten in the alloy is 0.5-1.5 mu m, the electrical resistance of the alloy is 0.035-0.041X10-6omega .m, the heat-transmit index is 200-223W.m-1.k-1. The advantage of it is that. The densification degree of the alloy is high, the tungsten crystal grain is small and uniform, the copper is highly dispersed to compose a compact net. And the flow of it is short, the technology operation is easy and reliable, the production efficiency is high, the energy and production cost is lower, and an industrial production can be carried on according the method.

Moulding method of magnesium alloy ultrathin sheet material

The invention discloses a molding method of ultra-thin magnesium alloy plank stuff, which firstly carries out heat preservation of magnesium alloy cast ingots at the temperature of 648 to 688 K for 22 to 25 hours under the protection of inert gases, implements the homogenization treatment of ingot blanks, directly cogs the ingot blanks with heat extrude until the total deformation degree of the heat-extruded and cogged ingot blanks reaches over 40 percent and then implements annealing; the molding method trims the plate blanks after the heat-rolled cogging into required width dimension, implements transverse rolling in a thermal treatment status and controls the heat rolling deformation degree between 20 and 30 percent at the first time, implements longitudinal rolling after the middle annealing, and then implements a plurality of times of transverse rolling, longitudinal rolling, repeated transverse rolling and repeated longitudinal rolling in the thermal treatment status with the assisted middle annealing until the thickness of the plank stuff is 1mm; the molding method implements the cold rolling of the plank stuff with the reduction of 5 percent in each pass, the total deformation degree of the cold rolling between two middle annealing is controlled at 30 percent, and the thickness of the plank stuff after the cold rolling is 0.1mm; the molding method finally implements the flattening and the finishing operation of the plank stuff. The plank stuff produced by the molding method of the invention has tiny crystal grains, even tissue, little defects, lessening cardinal area texture, and improving mechanical, corrosion resistant and electrochemical performance, etc..

A kind of magnesium alloy solder containing rare earth element Er and preparation method thereof

InactiveCN102294553ASolve severe segregationSolve the coarse grainWelding/cutting media/materialsSoldering mediaRare-earth elementSlag
The invention relates to a magnesium alloy brazing filler metal containing a rare-earth element Er and a preparation method thereof, and belongs to the technical field of magnesium alloy connection. The magnesium alloy brazing filler metal comprises the following components in percentage by weight: 40-55% of Mg, 39-55% of Zn, 1-5% of Al and 0.1-1.5% of Er, wherein the Er is uniformly distributed.The preparation method comprises the steps of arranging alloy ingots in a preheat crucible, heating under protective atmosphere and mechanical stirring, fishing slag after the alloy ingots are completely fused, stopping heating brazing filler metal, stirring the brazing filler metal, applying ultrasonic waves on the fused brazing filler metal after the brazing filler metal is cooled to 380-600 DEG C, inserting an ultrasonic rod preheated to 300-700 DEG C into a brazing filler metal liquid level with the ultrasonic frequency of 18-22kHz, ultrasonic intensity of 0.5-5W/cm2 and the time of 10-150s, standing still after moving out the ultrasonic rod after ending, pouring the brazing filler metal liquid into a mould and air cooling to room temperature. The number of dendritic crystals of the obtained product is obviously reduced, crystal grains are refined, and the strength and the toughness are improved.

Method for improving titanium alloy swaging forged structure homogeneity

The invention discloses a method for improving the titanium alloy swaging forged structure homogeneity. The method includes the steps of (1) placing titanium alloy which is obtained through conventional upsetting swaging forging and provided with the square cross section on an operating platform, enabling the length direction of the titanium alloy with the square cross section to be parallel to the axial direction of an upper flat anvil, overall flattening the titanium alloy with the square cross section in the diagonal direction of the square cross section, and obtaining titanium alloy with the hexagon cross section, (2) turning over the titanium alloy with the hexagon cross section by 90 degrees to carry out overall flattening, and obtaining titanium alloy with the octagon cross section, and (3) repeating the step (2) on the titanium alloy with the octagon cross section until a titanium alloy forge piece with the square cross section and the size same as the size of the titanium alloy with the square cross section is obtained. According to the method, large plastic deformation is carried out on the cross section of a material in different directions, the cross inhomogeneous deformation caused by swaging deformation in a single direction is improved, and therefore the aim that structures of various portions of the forge piece are homogeneous is achieved.

Method for preparing high-density pure tungsten product through low-temperature sintering

ActiveCN105478776ALower sintering densification temperatureHigh tap densityHigh densityHydrogen atmosphere
The invention provides a method for preparing a high-density special-shaped pure tungsten product through low-temperature sintering, and belongs to the technical field of powder injection molding. The method comprises the technological processes that an air flow mill is adopted for carrying out dispersing and staging treatment on commercially available high-purity tungsten powder, the treated powder and a bonding agent are evenly mixed for mixing, and even feed is obtained; the feed is subjected to injection molding to form a blank in a certain shape; and the formed blank is subjected to solvent degreasing and hot degreasing and then is sintered, and the tungsten product is obtained. Powder is subjected to dispersing and staging treatment through the air flow mill under the protective atmosphere, the powder is driven by gas to collide with each other and can be treated on a large scale, and no impurity is introduced; the particle size distribution of the treated powder becomes narrow, and the shape of particles becomes regular and is similar to a spherical shape; and loose-fitting tap density is increased, the loading amount of the injection-molded powder is correspondingly improved to 55%-70%, and the density of the pure tungsten product manufactured after sintering of the hydrogen atmosphere of 1,900 DEG C is higher than 96%.

Process for preparing nickel-base superalloy

The invention discloses a process for preparing nickel-base superalloy. The superalloy consists of the following components in percentage by weight: 22.5 to 24.5 percent of Cr, 7.0 to 8.0 percent of Co, 6.5 to 7.5 percent of W, 3.0 to 4.0 percent of Mo, 1.2 to 1.8 percent of Al, 1.5 to 2.5 percent of Ti, 2.0 to 3.0 percent of Nb, 1.0 to 2.0 percent of Mn, 2.0 to 4.0 percent of Fe, 0.02 to 0.08 percent of B, 0.5 to 1.5 percent of Ce, less than or equal to 0.1 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 0.008 percent of P, less than or equal to 0.008 percent of S and the balance of Ni. The process for preparing the nickel-base superalloy comprises a smelting process and a heat treatment process, wherein the smelting process comprises the steps of: smelting master alloy by using a vacuum induction furnace, and performing directional solidification in a liquid metal directional furnace to prepare directional column crystal alloy, wherein the vacuum degree of the directional furnace is about (1-5)*10<-4>mmHg, the pouring temperature is 1,580 to 1,600 DEG C, the drawing speed is 4 to 8mm/min, the temperature gradient is 75 to 85 DEG C/cm, and the temperature of liquid tin is 250 to 350 DEG C; the heat treatment process comprises the following steps of: heating the column crystal alloy obtained through smelting to 1,240 to 1,260 DEG C, preserving heat for 3 to 5 hours, and performing air cooling to room temperature; heating to 1,150 to 1,170, preserving heat for 3 to 5 hours, and performing air cooling to room temperature; and heating to 930 to 950 again, preserving heat for 8 to 12 hours and performing air cooling to room temperature.

Method for preparing RE-Mg-Ni-M series hydrogen storage alloy

ActiveCN101113497AThe melting process is convenient and fastLow impurity contentCunifeIngot
The invention relates to a preparation method of RE-Mg-Ni-M based hydrogen storage alloy. Under the protection of inert gases, the as-cast condition products of the RE-Mg-Ni-M based hydrogen storage alloy are smelted through using a cold-crucible magnetic-suspension furnace; heat-treated products are obtained by heat treatment of the as-cast condition products. The method has the steps that: (1) material is prepared; (2) metal Ni and M are smelted together; (3) metal RE is smelted; (4) the casting ingots obtained from step (2) and step (3) are smelted; (5) the ingot obtained from step (4) is overturned and smelted to obtain alloy solution, then master alloy of magnesium is added into the alloy solution to obtain the as-cast condition products of the RE-Mg-Ni-M based hydrogen storage alloy by cooling; (6) heat treatment is carried out to the as-cast condition products to get the heat-treated product. The single weight of the as-cast condition products and heat-treated products is 50-1000g; the content of magnesium in the products is close to designed content; the components of the as-cast condition products are uniform and have high hydrogen storage capacity; the structure and components of the heat-treated products are uniform and also have high hydrogen storage capacity and long cycling life.
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