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2663results about How to "Change structure" patented technology

Integrated pin tool for friction stir welding and composite method of resistance-friction stir welding thereof

The invention discloses an integrated pin tool used for friction stir welding and a composite method of resistance-friction stir welding thereof. The pin tool comprises a pin tool body arranged on a friction welder and a tool pin arranged at the lower part of the tool pin body which is connected with the welder in a clamping and insulating manner; the pin tool also comprises a forced cooling system, a current carrying system, a gas shielding system, a temperature sensing and detecting system, a sealing and insulation system, an inner shaft shoulder and the tool pin, and is an integrated pin tool which has the functions of gas shielding, forced circulation cooling of internal liquid medium, automatic temperature sensing and detection, tool pin changing and composite non-keyhole resistance-friction stir welding. The invention overcomes the difficulty of friction stir welding of the high melting point metal and meets the harsh technical requirements of the friction stir welding of the low melting point metal, improves the quality of welding joints, prolongs the service life of the pin tool and realizes the friction stir welding of high melting point metal and low melting point light alloy, with low cost, high efficiency and excellent quality.
Owner:CHONGQING UNIV

Preparation method of negative electrode slurry capable of reducing expansion of lithium ion battery

The invention discloses a preparation method of negative electrode slurry capable of reducing the expansion of a lithium ion battery. The preparation method comprises the following steps of: carrying out dry blending on a negative electrode active substance and a conducting agent in advance; dissolving sodium carboxymethyl cellulose into de-ionized water to obtain a CMC (Carboxyl Methyl Cellulose) gel solution with the concentration of 1.0%-2.0%; adding one part of the CMC gel solution into a mixture of the negative electrode active substance and the conducting agent and stirring at a high speed for 0.5-1h; adding the balance of CMC gel solution and stirring at a high speed for 1-3h; adding a modified SBR (Styrene Butadiene Rubber) binding agent and stirring at a middle speed for 0.3-1h; and adjusting the viscosity. By adopting the method of carrying out the dry blending on artificial graphite and the conducting agent in advance, adding the glue solution by two times and utilizing modified SBR as the binding agent, a bridge phenomenon of the artificial graphite is reduced, a pole piece structure is changed, the binding force between grains is improved and the expansion of a negative electrode is reduced; meanwhile, the slurry sedimentation of the artificial graphite is inhibited. The preparation method of the negative electrode slurry capable of reducing the expansion of the lithium ion battery has important meanings on ternary lithium ion batteries and improvement of machinability, capacity and safety of high-capacity power batteries.
Owner:南京国轩新能源有限公司

Antibacterial bacteriostatic polysulfone hollow fiber ultrafiltration membrane and preparation method thereof

The invention provides an antibacterial bacteriostatic polysulfone hollow fiber ultrafiltration membrane, which is a mixture consisting of polysulfone (PS) dissolved in solvent and nanometer antibacterial material. Based on parts by weight, the ultrafiltration membrane comprises 5 to 25 parts of polysulfone, 0.05 to 5 parts of nanometer antibacterial material, 2 to 10 parts of additives, 65 to 90 parts of solvent. The invention simultaneously discloses a preparation method, which comprises: (1) dissolving the polysulfone in the solvent in a spinning liquid tank, adding the nanometer antibacterial material and the additives, mixing well and obtaining membrane casting liquid; (2) standing and curing the obtained product; (3) extruding the cured material in the spinning liquid tank, filtering the cured material through a filter so as to remove impurities, metering the obtained product through a metering pump and filtering the obtained product through the filter so as to remove the impurities; (4) spurting membrane silk through a silk-spurting plate; (5) forming the membrane silk into a membrane in coagulating bath; and (6) soaking the formed membrane in pure water in washing bath, washing the solvent and the additives away, winding and outputting the polysulfone hollow fiber ultrafiltration membrane. The membrane has a good bacteriostatic effect.
Owner:SHANGHAI AQUA PURIFICATION EQUIP

Array-type novel high-performance eddy current damper

InactiveCN102797786ACompact structureHigh damping force to damper mass ratioMagnetic springsShock absorbersElectricityEngineering
An array-type novel high-performance eddy current damper consists of an electrical eddy current energy consuming unit, an elastic buffer unit, an electromagnetic shielding component, an axial displacement guiding unit and a supporting component, wherein the elastic buffer unit, the electrical eddy current energy consuming unit and the axial displacement guiding unit are sequentially inlaid on the supporting component from the bottom up; the bottom of the electrical eddy current energy consuming unit serving as a core component of the damper is connected with the top of the elastic buffer unit; the top of the electrical eddy current energy consuming unit is connected with the bottom of the axial displacement guiding unit; a flexible spherical hinged support is arranged at the top end of the damper and is connected with the axial displacement guiding unit and an external load to output a damping force; and a flexible spherical hinged support is arranged at the bottom end of the damper and is used for fixing the damper. The array-type novel high-performance eddy current damper has the advantages of adjustable damping coefficient, high ratio of the damping force to the integral mass of the damper, compact structure, high reliability and the like; and in the technical field of structural vibration control, the array-type novel high-performance eddy current damper has relatively high practical value and wide application prospect.
Owner:BEIHANG UNIV

Ruthenium ammonia synthesis catalyst by using N-doped active carbon as carrier and preparation of ruthenium ammonia synthesis catalyst

The invention belongs to the technical field of preparation of ammonia synthesis catalysts, and particularly relates to a ruthenium ammonia synthesis catalyst by using N-doped active carbon as a carrier and a preparation method of the ruthenium ammonia synthesis catalyst. The preparation method of the N-doped active carrier, disclosed by the invention, comprises the following steps: dissolving a precursor containing nitrogen in water so as to prepare a solution; loading the solution on graphitized active carbon by an equivalent-volume impregnation method; heating and evaporating the solution loaded on the graphitized active carbon at the temperature of 100 DEG C so as to be dried; then transferring the dried solution loaded on the graphitized active carbon into a tubular furnace, and roasting the transferred solution loaded on the graphitized active carbon at the temperature of 200 DEG C for some time; then performing the treatments of programmed warming and the like so as to obtain the N-doped active carbon carrier. The carrier is large in specific surface area and is high in activity, the doping content of nitrogen is controllable, and when the carrier is used for the ruthenium ammonia synthesis catalyst, the heat stability and the activity of the Ru/AC catalyst are improved.
Owner:FUZHOU UNIV

Preparation process of sputtered rotary molybdenum-sodium-alloy tubular target

The invention discloses a preparation process of a sputtered rotary molybdenum-sodium-alloy tubular target. The preparation process comprises the following steps of: (1) preparing materials, wherein used powder comprises molybdenum powder and sodium molybdate powder, the physical property of the powder is as follows: the Mo content of the molybdenum powder is at least 99.95% with the granularity of 3-5 microns, and the sodium molybdate content of the sodium molybdate powder is at least 99.0% with the granularity of 20-40 microns; (2) blending the powder: weighing the molybdenum powder and the sodium molybdate powder proportionately, controlling the mass percentage content of the molybdenum powder to be 90-99% and that of the sodium molybdate powder to be 1-10%; (3) carrying out mechanical alloying: synthesizing nanometer molybdenum-sodium alloy powder; (4) filling into a die; (5) carrying out cold isostatic pressing; (6) sintering; (7) forging; (8) performing vacuum annealing; and (9) mechanically processing to obtain the sputtered rotary molybdenum-sodium-alloy tubular target. A produced molybdenum-niobium-alloy tubular target has characteristics of uniform elements, no segregation, fine grain size and high purity, completely meets requirements of CIGS (Copper Indium Gallium Selenide) photovoltaic cells and increases the use efficiency of the cells.
Owner:LUOYANG SIFON ELECTRONICS
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