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3245results about How to "Small particles" patented technology

Manufacture method and device of three-dimensional workpiece

The invention provides a method and equipment using organic adhesive mixed solvent and powder to manufacture three-dimensional workpieces. The work principle is as follows: the raw materials are stirred into slurry, which is laid as a green compact thin layer that can disintegrate in disintegrant; the green compact thin layer can form a workpiece thin layer that does not disintegrate in the disintegrant after scanned by an energy beam; in such a cycle, the steps of laying the thin layer and energy beam scanning are repeated, and then the three-dimensional workpiece can be formed; and the disintegant is used for separating the green compact not scanned by the energy beam from the workpiece, thus remaining the needed three-dimensional workpiece. The invention is widely applicable to manufacturing plastic, metallic, ceramic and compound workpieces, can avoid the defects of a selective laser sintering method, can use fine and very thin powder and therefore, can manufacture a finished product which is better than that made in the traditional selective laser sintering method in surface roughness and texture fineness, in addition, through subsequent densified sintering, the metallic and ceramic workpieces can have the strength superior to that in the traditional selective laser sintering method.
Owner:OUKESI INT

Nanoscale lithium titanate compound and preparation method thereof

The invention relates to a nanoscale lithium titanate compound and a preparation method thereof. The nanoscale lithium titanate compound is prepared by following steps: a lithium compound, a titanium compound and a doped element compound are mixed according to a molar ratio of 0.75-0.80:1:0:0.05 of Li to Ti to doped elements so as to form a mixture A; the mixture A and a complexing agent are mixed according to a weight ratio of 1:0.1-10 and dissolved in water to form a mixture B; and the mixture B and a carbon nanotube dispersion C are mixed to form the nanoscale lithium titanate compound coated by carbon nanotubes with a nanoscale grain size. The preparation method comprises the following steps: mixing the mixture B and the carbon nanotube dispersion C; heating an obtained mixture in nitrogen at 100-200 DEG C for 1-2 hours to obtain gel; and sintering the obtained gel in inert atmosphere at 500-1,000 DEG C for 5-48 hours to obtain the powdered lithium titanate compound. The lithium titanate compound is nanoscale lithium titanate coated by the carbon nanotubes, has fine and even grain and high purity and has the characteristics of higher charge and discharge capacity, good rate discharge performance, good cycle performance and good safety performance, and the like, thus the lithium titanate compound is an ideal anode material for manufacturing a lithium ion battery.
Owner:SHENZHEN DYNANONIC

Hydrothermal synthesis method for lithium ferromanganese phosphate anode material of lithium ion battery

The invention relates to a hydrothermal synthesis method for lithium ferromanganese phosphate anode material of a lithium ion battery, belonging to the technical field of lithium ion batteries. The method has the following processing steps of: step 1, preparing LiMnxFe1-xPO4 through a hydrothermal synthesis reaction: mixing an aqueous lithium hydroxide solution, an aqueous ferrous sulfate solution and phosphoric acid under a stirring condition, after sealing, heating to 150 DEG C to 180 DEG C within 0.5 to 2 h, reacting for 0.5-4 h under the pressure of 0.48-1.0 Mpa, cooling to less than 80 DEG C, and filtering; step 2, mixing with organic matters and drying: mixing a wet filter cake with a soluble carbon source organic matter, and carrying out spray drying or expansion drying; and step 3, carrying out carbon-coated processing: roasting LiMnxFe1-xPO4 carbon source compound powder at a temperature between 600 DEG C and 750 DEG C for 4-6 h under an insert gas condition, and cooling to less than 150 DEG C to obtain a carbon-coated lithium ferromanganese phosphate anode material of the lithium ion battery. The hydrothermal synthesis method disclosed by the invention has the advantages of simple and controllable technology, convenience for operation, low cost, high crystallization degree of products, uniform dispersion, high specific capacity, high conservation rate of the cycling capacity, and the like.
Owner:朱鸥鹭

High-efficiency fodder crushing, vibrating and screening device

The invention discloses a high-efficiency feed crushing and vibrating screening device, which comprises a base, a slide rail is fixed on the top of the base through a bracket, a crushing box is slidably connected above the slide rail, a screen is arranged at the bottom of the crushing box, and a bottom left corner of the crushing box is connected with a Moving rod; the top of the base is also provided with a fixed seat, the front side wall of the fixed seat is provided with a deceleration motor, the motor shaft at the front end of the deceleration motor is installed with a rotating disc, the top of the front end of the rotating disc is provided with a pin shaft, and the pin shaft is rotatably connected with a connecting rod , the connecting rod is hinged with the moving rod; the left end of the slide rail is fixedly provided with a fixed rod, the top of the front side wall of the fixed rod is hinged with a knocking rod, the bottom of the knocking rod is fixedly provided with a baffle, and the top of the moving rod is provided with a push plate. During the feed grinding process of the present invention, the grinding box moves left and right by rotating the disc, thereby driving the feed to shake; during the grinding process, the knocking rod knocks on the side wall of the grinding box to prevent the feed from sticking to the inner wall of the grinding bucket and avoid screen blockage.
Owner:GUANGZHOU SONGSUNCE INFORMATION TECH CO LTD

A preparation method of surface metallized composite material through chemical plating under photocatalysis

InactiveCN101550546APromote reductionImprove plating speed and productivityLiquid/solution decomposition chemical coatingIonPhotocatalysis
The present invention pertains to the technical field of the preparation of surface metallized composite material and relates to a preparation method of surface metallized composite material through chemical plating under photocatalysis, wherein the fibre, plastic, fabric, resin, glass, ceramic, monocrystalline silicon or metal encapsulated with semiconductor nano inorganic powder is used as substrate material, or the semiconductor nano inorganic powder is used as substrate material, the photocatalytic technique integrates the reducer effect in conventional chemical plating, metal is carried on the surface of substrate material effectively, and surface metallized composite material is prepared. The advantage is that it makes use of the feature that semiconductor nano inorganic powder will be excited and generate a large number of electron-cavity pairs under the irradiation of photons of which energy is equal to or greater than band-gap energy, while electrons have a reducing effect and help accelerate the reduction of metal ions, and combines this feature with the reducer effect in conventional chemical plating to raise plating speed and production efficiency, reduce product cost and prepare surface metallized composite material with uniform surface metal layer, tiny metal particles, high quality and low cost.
Owner:UNIV OF SCI & TECH BEIJING

Preparation method and application of core-shell structure cobalt-base catalyst of middle distillate for synthesis gas preparation

The invention relates to a core-shell structure cobalt-base catalyst of a middle distillate for synthesis gas preparation, which comprises the following components in percentage by weight: 5 to 30 percent of cobalt and 70 to 95 percent of silica. The catalyst has the following physical properties: the specific surface area is 200 to 1400m<2> / g, the pore volume is 0.5 to 1.3cm<3> / g, the average pore size is 2.0 to 18nm, the cobalt crystallite dimension is 12 to 25nm, and the particle size of the core-shell structure cobalt-base catalyst is less than 100nm, and cobaltosic oxide nano particles are coated in a mesoporous silicon shell to form a core-shell structure. The invention has the advantages of simple operation, high yield, high activity and high selectivity of the middle distillate.
Owner:中科潞安能源技术有限公司

Preparation method of superfine nanometer lithium iron phosphate electrode material and application thereof

The invention discloses a preparation method of a superfine nanometer lithium iron phosphate electrode material, comprising the following steps of: firstly, taking an iron source compound and a phosphorus source compound as raw materials to obtain nanometer ferrous phosphate as a precursor; and secondly, using the ferrous phosphate and the lithium source compound to prepare the superfine nano lithium iron phosphate electrode material. The preparation method of ferrous phosphate, disclosed by the invention, has a simple production process; the obtained nanometer ferrous phosphate can be used for preparing the high-purity superfine nanometer lithium iron phosphate; and the ferrous valence state is not changed when the ferrous phosphate is used for preparing the lithium iron phosphate, thus, no carbon source compound or reducing agent needs to to be added to change the iron valence state, and then the carbon-coated lithium iron phosphate or non-carbon-coated lithium iron phosphate can be directly prepared. The nanometer lithium iron phosphate manufactured by the nanometer ferrous phosphate precursor has excellent performance, good discharge capacity and voltage platform performance under high capability and high multiplying power, and long cycle life.
Owner:GUANGXI NUOFANG ENERGY STORAGE TECH

Metallic catalyst for synthesizing dimethoxym ethane and methyl formate and production method thereof and use

The present invention relates to a metal catalyst synthesizing methylal and methyl formate. In weight percentage of the metal catalyst, the content of vanadium is calculated by the weight of V2O5; the content of titanium is calculated by the weight of TiO2; the weight proportion of the V2O5 and the TiO2 in the catalyst is 5 to 70 to 30 to 95; the V2O5 and the TiO2 take 20 percent to 100 percent of the catalyst in weight percentage; the content of accessory ingredient is calculated by the content of the oxide of the accessory ingredient and takes 0wt percent to 2.0wt percent of the catalyst in weight percentage; support takes 0wt percent to 78wt percent of catalyst in weight percentage. The catalyst has the advantages of high methanol conversion rate, the high selectivity of the methylal and the methyl formate, the good stability of the catalyst and long life.
Owner:SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI

Catalyst for carbon dioxide methanation and preparation method thereof

The invention discloses a catalyst for carbon dioxide methanation and a preparation method of the catalyst, belonging to the technical field of carbon dioxide methanation. The catalyst for carbon dioxide methanation is composed of a composite carrier and an active ingredient at a ratio of 84-90wt%:10-16wt%, wherein the composite carrier is composed of gamma-Al2O3 and water soluble metal oxide at a mass ratio of 77-86:2-10; and the active ingredient is Ni which exists in the catalyst in a form of NiO. The catalyst is high in activity, low in cost and better in stability, and can be used for carbon dioxide methanation reaction under normal pressure condition.
Owner:SICHUAN UNIV

Preparation method of non-supported high-activity hydrogenation catalyst

The invention relates to a preparation method of a non-supported high-activity hydrogenation catalyst. The preparation method of the non-supported high-activity hydrogenation catalyst is characterized by comprising the following steps: preparing an acid solution A containing at least one group VIII metal compound and at least one group VIB metal compound, and an alkali solution B containing at least one silicon source or aluminium source, slowly mixing the two solutions into a sedimentation reactor, carrying out co-precipitation reaction to obtain slurry under the conditions that temperature is 20-120 DEG C and pH value is 7-12, and carrying out ageing, suction filtration, washing, drying, moulding and roasting on the slurry, so that a catalyst with high catalytic performance for hydrogenation reaction of a fixed bed is obtained. The prepared non-supported hydrogenation catalyst has large specific surface area, high pore volume and high hydrogenation activity; meanwhile, the preparation method of the non-supported high-activity hydrogenation catalyst is simple, reaction conditions are mild, and operation is easy and stable, so that the preparation method of the non-supported high-activity hydrogenation catalyst is applicable to industrial batch-type production.
Owner:CNOOC TIANJIN CHEM RES & DESIGN INST +1
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