993results about How to "Good sphericity" patented technology

The invention discloses a preparation method of mesophase carbon microspheres from coal liquefaction residues serving as raw materials, which comprises the following steps of: firstly carrying out solvent extraction on the coal liquefaction residues, then carrying out a series of processing to obtain refined asphalt with different contents of quinoline insoluble substances, and carrying out thermal polycondensation reaction on the refined asphalt in the presence of a chemical auxiliary agent and a nucleating accelerator at the temperature of 380-450 DEG C, the pressure of 0-5 MPa and the stirring rotation speed of 40-500 r/min for 1-20 hours to obtain the mesophase microspheres. According to the invention, the chemical auxiliary agent and the nucleating accelerator can be added during theheat treatment process to improve the yield and narrow the particle size distribution of the mesophase carbon microbeads, and the mesophase carbon microspheres are prepared from the coal liquefactionresidues serving as the raw materials and have the advantages of low cost, simple preparation process, high yield (up to 35%), narrow particle size distribution, good sphericity, etc.

The invention discloses a method for preparing polymer micro balls with uniform grain diameter and controllable size, which comprises the following steps: a disperse phase (organic solution of polymers) is introduced into a continuous phase (water solution containing surfactant) through an orifice device; under the scouring action of the continuous phase, the disperse phase forms tiny liquid drops with uniform grain diameter; and after being solidified in the continuous phase without a solvent, the liquid drops form the polymer micro balls with uniform grain diameter. The invention is characterized in that the grain diameter of the polymer micro balls can be changed by adjusting the operation parameters to prepare the polymer micro balls with uniform grain diameter; and the average grain diameter of the polymer micro balls with uniform grain diameter can be adjusted within the range of 10-1000 micrometers, and the dispersion coefficient is smaller than 20%. The prepared polymer micro balls have the advantages of uniform grain diameter, low dispersion coefficient, smooth surface and no adhesion; and the method has the advantages of strong adjustability, simple equipment and stable operation.

The invention relates to a method and system for preparing a particle-reinforced metal-based composite material through injection molding. Ceramic reinforced particles and high-pressure inert gas are uniformly mixed in an acceleration nozzle to be used as an atomizing medium, thereby improving the density, momentum and impact force of the atomizing medium, obviously enhancing the atomization effect and reducing the inert gas consumption as compared with the atomization based on the single use of inert gas. After atomization is completed, the ceramic particles are uniformly dispersed in atomized molten drops, and the molten metal drops doped with the reinforced particles are gradually solidified in the flying process and are ultimately deposited, solidified and molded on a receiver, thus obtaining the high-performance metal-based composite material of which the ceramic reinforced particles are uniformly distributed. In addition, the ceramic reinforcements used in the invention are prepared by a reaction and ball milling method, thereby ensuring that the reinforced particles better in strength, interface stability, high-temperature performance and other aspects can be prepared at a low cost.

The invention relates to recycled concrete and a preparation method thereof, and belongs to the technical field of concrete. The recycled concrete comprises (by weight): 150-280 parts of cement, 90-130 parts of water, 800-950 parts of modified recycled coarse aggregate, 400-530 parts of fine aggregate, 40-85 parts of fly ash, 80-100 parts of mineral powder, 50-140 parts of zeolite powder, 30-60 parts of epoxy resin, 4-10 parts of a water reducing agent and 2-6 parts of an air entraining agent. The preparation method of the modified recycled coarse aggregate comprises the following steps: S1, crushing and screening waste concrete to obtain recycled coarse aggregate; S2, soaking the recycled coarse aggregate obtained in the step S1 in an acetic acid solution with the mass concentration of 2-7%, and airing; S3, stirring 80-110 parts of polyvinyl alcohol, 60-110 parts of silica fume, 40-80 parts of sodium silicate and 800-1,000 parts of water to obtain a modified liquid; and S4, soaking the recycled coarse aggregate obtained in the step S2 in the modified liquid obtained in the step S3, taking out the soaked recycled coarse aggregate, and baking the recycled coarse aggregate to obtainthe modified recycled coarse aggregate. The recycled concrete provided by the invention has a good compressive strength effect.

The invention relates to a plasma atomization method and apparatus for preparing spherical pure titanium or titanium alloy powder, and belongs to the technical field of preparation of titanium or titanium alloy powder. The plasma atomization method for preparing pure titanium or titanium alloy powder comprises the following steps of (1) preparing a titanium wire or titanium alloy wire with the diameter ranging from 3 millimeters to 20 millimeters, (2) using a plasma torch to fuse and atomize the titanium wire or titanium alloy wire in an atomization bin with an argon atmosphere to obtain atomized pure titanium particles or titanium alloy particles, and (3) feeding argon flow with the temperature ranging from 300 DEG C to 500 DEG C into the atomization bin, carrying out laminar cooling on the atomized pure titanium particles or titanium alloy particles to obtain pure titanium or titanium alloy powder. The obtained powder is good in degree of sphericity and low in the content of satellite balls, and has the advantages of being uniform in size distribution, high in purity and degree of sphericity, good in liquidity, low in oxygen content and impurity content, free of bond or cluster phenomenon and the like. The prepared titanium powder can be widely applied to the forming manners such as metal additive manufacturing, powder injection moulding and hot isostatic pressing for manufacturing parts with high precision.

The invention discloses a method for preparing metal reinforced uranium dioxide nuclear fuel pellets. The method mainly comprises two steps: firstly, preparing core-shell structure granules, namely performing low-temperature rapid pre-sintering on UO2 powder by using a Spark Plasma Sintering SPS technique, pelletizing, balling to obtain UO2 pellets, performing physical mixing on the UO2 pellets with metal (one of Mo, Cr, W and the like) micro powder to coat surfaces of the UO2 pellets by the metal micro powder, thereby obtaining metal coated uranium dioxide core-shell structure granules; secondly, preparing a nuclear fuel pellets, namely performing high-temperature liquidation on the metal powder on the surfaces of the UO2 pellets, thereby forming a micro cell structure continuous phase similar to a cytomembrane structure around the UO2 pellets, and obtaining the special metal reinforced UO2 nuclear fuel pellets with a UO2 substrate.

The invention relates to a high-performance alloyed spherical powder preparation device and method for laser 3D (three-dimensional) printing. The device comprises a vacuum acquirement and inflation system, an induction smelting system, an atomization powder preparation system, a power collection system and a power system. The preparation method includes that: (1) the induction smelting system selects a non-crucible induction system or a crucible induction system; (2) alloy bars are fixed on a continuous feeder, or nickel-based/cobalt-based alloy bars are put in a smelting chamber; (3) the smelting chamber, an atomizing chamber and a power collection device are vacuumized prior to be fed with inert gas; (4) induction smelting is started, when alloy reaches preset temperature, alloy droplets are enabled to enter the atomization powder preparation system, and nozzles are started to perform atomization powder preparation; alloyed power prepared in the atomization chamber is collected through the powder collection device. The device can realize mechanical control, automatic control and real-time monitoring; the prepared alloy powder is high in yield, uniform in particle size distribution, good in degree of sphericity, uniform in chemical component, good in mobility, low in oxygen content and low in hollow sphere rate.

The invention discloses a method for preparing cellulose microspheres by taking ionic liquid as a solvent. The method comprises the steps of: 1) preparing cellulose solution as follows: dissolving the cellulose into the ionic liquid under low-speed stirring and proper temperature; 2) adding inert particles: adding proper amount of inert particles, and stirring evenly; 3) forming spheres by reversed phase suspension: adding oil phase and a surface active agent, leading the cellulose solution to be condensed into spheres by reversed phase suspension and program temperature reduction; 4) curving microspheres: adding a curving agent and curving to form the cellulose microspheres; 5) washing: using deionized water to wash and soak so as to obtain the cellulose microspheres; and 6) screening: screening in a wet state and obtaining the cellulose microspheres with a certain particle size range. The developed preparation process is simple and convenient, the used solvent is safe and non-toxic, the prepared cellulose micrsphere has porous structure and proper particle size, high sphericity and good hydropathy, can adjust density, can be used as substrate of an absorbent and has good biocompatibility.

The invention belongs to the field of deep processing and utilization of nonmetal minerals, composite materials and functional materials, and particularly relates to coarse whiting filler for a gas-permeable membrane and a preparation method of the coarse whiting filler. The invention aims to provide the preparation method of the coarse whiting filler for the gas-permeable membrane. The preparation method comprises the following steps: crushing marble until the diameter is 40 to 70 micrometers; uniformly mixing marble powder, water and a high-molecular surfactant at a weight ratio of 1:(0.2-1.5):(0.001-0.1); ball-milling and filtering; dehydrating until the water content is not larger than 1%; dismissing gathered powder; drying until the water content is not larger than 0.2%; adding an activating agent of which the weight is 0.5% to 3% of the total weight of the dried powder material; fully reacting at the temperature of 110 to 140 DEG C; and cooling, uniformly mixing and packaging. The coarse whiting filler prepared by the method disclosed by the invention is good in performance and can be well applied to preparation of the gas-permeable membranes and relevant products.

The invention relates to a device for preparing superfine micro-spherical titanium powder for 3D printing. The device for preparing the superfine micro-spherical titanium powder for 3D printing comprises an automatic feeding system, an insulation dynamic seal unit, an annular gas atomization nozzle, an atomization chamber, an arc cathode smelting well, a radiating cover, a protection cover, a powder collection tank, a supersonic gas crushing mill and a radio frequency plasma reactor. The invention further relates to a method for preparing the superfine micro-spherical titanium powder for 3D printing. The method comprises the steps that firstly a gas atomization unit is used for performing initial powder production on raw titanium powder; then crushing is used for further reducing the granularity of the titanium powder; a plasma unit is used for further processing the titanium powder; the high-energy characteristic of radio frequency plasma is used for injecting carrying gas for irregular-shaped titanium powder particles into a plasma torch, the irregular titanium powder is heated rapidly and melted, the melted particles form drops with high sphericity degree under the action of surface tension, and the drops are solidified rapidly under an ultra-high temperature gradient to form the superfine micro-spherical titanium powder good in sphericity degree, high in purity and low in oxygen content.

A process for producing a spherical carbon material, comprising: subjecting a spherical vinyl resin to an oxidation treatment in an oxidizing gas atmosphere to obtain a spherical carbon precursor, and carbonizing the spherical carbon precursor at 1000-2000° C. in a non-oxidizing gas atmosphere. The thus-obtained spherical carbon material exhibits excellent performances, including high output performance and durability, when used, e.g., as a negative electrode material for non-aqueous electrolyte secondary batteries.

It is an object of the present invention to provide a multilayer wire which can accomplish both ball bonding property and wire workability simultaneously, and which enhances a loop stability, a pull strength, and a wedge bonding property. A semiconductor bonding wire comprises a core member mainly composed of equal to or greater than one kind of following elements: Cu, Au, and Ag, and an outer layer formed on the core member and mainly composed of Pd. A total hydrogen concentration contained in a whole wire is within a range from 0.0001 to 0.008 mass %.

The invention discloses a high-density and small-particle size nickel-cobalt-manganese hydroxide and a preparation method thereof. For the high-density and small-particle size nickel-cobalt-manganesehydroxide provided by the invention, a general chemical formula is NixCoyMnz(OH)2, wherein x+y+z=1, x is larger than or equal to 0.3 and smaller than or equal to 0.8, y is larger than or equal to 0.1and smaller than or equal to 0.4, and z is larger than or equal to 0.1 and smaller than or equal to 0.4; the particle sizes are d10 larger than or equal to 2 microns, d50 equal to 2.5-4 microns and d90 smaller than or equal to 6 microns, the tap density is larger than or equal to 1.4g/cm<3>, the specific surface area is 5-20m<2>/g, and the shape is spherical or spheroidal. The invention also discloses the preparation method of the high-density and small-particle size nickel-cobalt-manganese hydroxide. The preparation method is strong in controllability, can stably control the particle sizes ineach production batch without using a surfactant and is low in production cost, high in efficiency and good in physicochemical index of a final product.

The invention discloses a preparation method of nickel lithium manganate anode material LiNixMn2-xO4(x is more than 0 and is less than 1) and belongs to the preparing field of secondary battery materials. The preparing steps are that: nickel-source containing compound and manganese-source containing compound are firstly mixed according to chemometry, and then de-ionized water is added in the raw material mixture, and the solution is spray-dried for preparing the mixed powder; the mixed powder is mixed and sintered with the nickel-source containing compound, thus preparing the lithium ion battery anode material LiNixMn2-xO4(x is more than 0 and is less than 1). The method has simple and convenient process, short preparing time and low producing cost; the prepared product has stable structure, high specific capacity and good electrochemical performance; the method is suitable for large-scale industrial production of the lithium ion battery active material. The mean grain size of the product is 10mum and the initial discharge capacity thereof is 138mAh/g; after 200 times of 1.5C charge-discharge circulation, the capacity attenuation is less than 8 percent.

The invention relates to a positive electrode material of a lithium ion battery, especially to a high-capacity nickel-cobalt-lithium manganate precursor and a preparation method thereof. The high-capacity nickel-cobalt-lithium manganate precursor is characterized by having a chemical formula of NixCoyMnz(OH)2, wherein x is no less than 0.5 and no more than 0.9, y is no less than 0.05 and no more than 0.2, z is no less than 0.05 and no more than 0.3, and x+y+z is equal to 1. The invention provides the high-capacity nickel-cobalt-lithium manganate precursor prepared through coprecipitation and the preparation method thereof; and the prepared precursor has concentratedly distributed particle size, high tap density, good sphericility, high specific capacity, low cost, long service life, higher discharge plateau and energy density, primary 1C charge-discharge specific capacity of 195 mA.h/g and 186.5 mA.h/g, and capacity retention ratio of 95.6% after 50 cycles.

The invention discloses a preparation method of a silica shear thickening liquid. The preparation method comprises the following steps of: preparing monodisperse silica microspheres with certain grain size in an alcohol-water mixed liquid according to a multi-level seed growth method by utilizing tetraethoxysilane serves as a raw material and ammonia as a catalyst; after reaction is finished, adding shear thickening liquid dispersion media (polyethylene glycol, glycerol and the like) into a SiO2 suspension liquid; after mixing uniformly, removing ethanol, water and ammonia from the mixed liquid by adopting a heating and pressure-reducing method to finally prepare the silica shear thickening liquid, wherein the ethanol which is collected under reduced pressure can serve as a solvent and can be reused. In the preparation method, the SiO2 microspheres exist in the form of a uniformly dispersed suspension liquid from the synthesis link to the preparation link of the shear thickening liquid, so the agglomeration phenomenon of powder in drying and redispersion processes is avoided, and the stability and rheological property of the shear thickening liquid are improved.

The invention discloses a preparation method for nickel-base superalloy powder for laser forming, and belongs to the field of superalloy and powder metallurgy. According to the preparation method, vacuum induction melting and argon atomization powder making technologies are adopted, and the nickel-base superalloy powder suitable for laser forming is prepared. The nickel-base superalloy powder prepared through the method is high in small grain size powder, high in degree of sphericity, low in oxygen content, good in flowing performance, free of hollow defects, less in satellite powder and capable of meeting the technical requirement for laser forming.

The present invention relates to a novel, dual purpose binder formulation or system. The invention also relates to a process of agglomerating dispersed particles or fines into substantially spherical and crush resistant granules. The invention further relates to a method of covering a seed and binding the seed with a material mixture beneficial for seed germination. The invention also relates to an all-in-one seed agglomerated by the dual purpose binder formulation.

The invention provides a preparation method for fine metal powder and equipment achieving the method. On the one hand, metal materials are fused and atomized into liquid drops to be sprayed to a high-speed rotation disc and smashed into small liquid drops, and the center spraying axis of the liquid drops is perpendicular to the rotation disc face; on the other hand, the liquid drops sprayed to the high-speed rotation disc are cooled after being smashed, and the metal powder is obtained. Compared with the prior art, the metal powder prepared through the method is fine in grain size, good in degree of sphericity and narrow in grain size distribution range and has good application prospects.