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429results about How to "Improve compactness" patented technology

Coating method iron-based magnetically soft alloy powder and preparation method of soft magnet composite material

The invention relates to a coating method for iron-based magnetically soft alloy powder and a preparation method of soft magnet composite material. The coating method for iron-based magnetically soft alloy powder comprises the following steps: carrying out accelerated oxidation on iron-based magnetic metal powder at high temperature, forming an oxide layer on the surface of the powder and then carrying out acid pickling, thus obtaining powder with surface coated with SiO2, Al2O3 and Cr2O3 oxides. The preparation method of the soft magnet composite material comprises the following steps: adding coupling agent, silicon resin and lubricating agent to the coated powder, carrying out pressing forming, and then carrying out annealing heat treatment, thus obtaining the soft magnet composite material. According to the invention, the advantage that an oxide produced in reaction of elements including Si, Al and Cr contained in the iron-based magnetically soft alloy powder with oxygen is high in electrical resistivity, small in thermal expansion coefficient and steady in chemical performance and can resist high temperature is fully utilized; the adopted coating technology is to produce a coating layer in situ on the surface of the alloy magnetic powder, and is simple in process, easy to operate and low in cost; the metal soft magnet composite material prepared by adopting the method disclosed by the invention has good magnetic property and frequency stability.
Owner:CENT SOUTH UNIV

Sintered composite soft magnetic material and method for preparing same

The invention relates to a sintered composite soft magnetic material and a method for preparing the same. The material comprises a metal soft magnetic material, a soft magnetic ferrite and a low-melting-point soft magnetic alloy, wherein the metal soft magnetic material is formed by at least one of an Fe-Ni system, an Fe-Co system, an Fe-Co-V system, an Fe-Al system and an Fe-Al-Me system (Me is one or more than two of Co, Cr and Mo), the soft magnetic ferrite is formed by at least one of an Mn-Zn system, an Ni-Zn-based, an Li-Zn system and a Cu-Zn system, and the low-melting-point soft magnetic alloy is an Re-Fe-M system alloy (Re comprises one or more of 17 rare earth elements including Sc and Y, and M is one or more of metal elements including B, Al, Si, Ti, V, Cr, Mn, Co, Cu, Mo, Ni, Zn, Ga, Nb, Ta and W). The method for preparing the soft magnetic material formed by the components has the advantages that cold pressing and then sintering or hot pressing or spark plasma sintering are selected, and the soft magnetic material not only overcomes the low resistivity of the metal soft magnetic material and the low magnetic induction of the ferrite, but also maintains the excellent performance of the metal soft magnetic material and the soft magnetic ferrite.
Owner:GRIREM ADVANCED MATERIALS CO LTD

Multiple layer hydrogen infiltration -resistant compound film preparation method

The invention relates to a method for preparing a multi-layer hydrogen-permeation-resisting composite membrane, and belongs to the material technology field. The method adopts a coupling technique of aluminum and aluminum alloy coating and micro-arc oxidation to form the multi-layer hydrogen-permeation-resistance composite membrane at the home position on a stainless steel basal body, the composite membrane comprises an alloy layer formed by the basal body and coating metal, a coating metal layer, a composite layer formed by the coating metal and oxide ceramic and an oxide ceramic layer, etc., as shown in picture 1. Compared with the prior art, the method has the advantages of the aluminum and aluminum alloy coating and the micro-arc oxidation, overcomes the defect of the prior single technique, and forms the multi-layer hydrogen-permeation-resistance composite membrane with high capability; the ceramic layer thereof has controllable thickness, high compactness, good quality, and firm combination with the basal body, thereby enhancing the hydrogen-permeation-resisting and the corrosion-resisting properties of the stainless steel, improving the hot oxidation resistance and the abrasion resistance of the stainless steel, prolonging service life of the stainless steel container, and strengthening safety precautions.
Owner:SICHUAN UNIV

Forming process of anode foils for extra-high voltage aluminium electrolytic capacitors

InactiveCN101777432AImprove compactnessHigh capacitance per unit areaAnodisationElectrolytic capacitorsAmmonium pentaborateChemistry
The invention provides a forming process of anode foils for extra-high voltage aluminium electrolytic capacitors, comprising the following steps: placing aluminium foils which undergo electrolytic corrosion in pure water at 90 DEG C or above to carry out pretreatment; then carrying out first-stage formation on the pretreated aluminium foils in aqueous solution containing 1-9wt% of boric acid and 0.01-0.6wt% of ammonium adipate; then treating the foils which undergo first-stage formation with phosphoric acid solution at the concentration of 1-10wt%; then treating the foils which undergo phosphoric acid treatment at high temperature; then carrying out second-stage formation on the foils which undergo high temperature treatment in the aqueous solution containing 2-10wt% of boric acid and 0.01-0.09wt% of ammonium pentaborate; then treating the foils which undergo second-stage formation in the phosphoric acid solution at the concentration of 1-10wt%; then treating the foils which undergo phosphoric acid treatment at high temperature; finally carrying out third-stage formation on the foils which undergo high temperature treatment in the mixed aqueous solution containing 2-10wt% of boric acid and 0.01-0.09wt% of ammonium pentaborate and carrying out post-treatment on the foils which undergo third-stage formation in the aqueous solution containing 1-13wt% of phosphoric acid and 0.1-6wt% of ammonia, and cleaning and then drying the foils which undergo post-treatment.
Owner:YANGZHOU HONGYUAN ELECTRONICS

Distribution box type smart home terminal and comprehensive protection controller

The invention discloses a distribution box type smart home terminal and comprehensive protection controller. The distribution box type smart home terminal and comprehensive protection controller comprises a general air switch with earth leakage protection, a power supply module, a voltage and current transformer, a comprehensive fault and power utilization monitoring module, a front panel, an automatic switch and a general control module, wherein the comprehensive fault and power utilization monitoring module comprises an electric quantity detection, electric leakage detection, short-circuit fault and arc fault rapid detection integrated module and is provided with a magnetic latching relay automatic switch so as to realize modularized and integrated power utilization monitoring and home distribution fault control protection. According to the distribution box type smart home terminal and comprehensive protection controller, a smart home control management terminal is used as a distribution box cover plate so as to realize organic integration of a home distribution box and a smart home control system; when home power utilization monitoring and other monitoring management are carried out, a home power utilization fault line and fault types thereof can be determined rapidly. The distribution box type smart home terminal and comprehensive protection controller realizes home smart control, protection and management and has the technical characteristics of compact type and comprehensive smartness.
Owner:FUZHOU UNIVERSITY

System and method for forming disk part by performing two-stage atomizing and spraying

InactiveCN102528035ASpeed ​​up the solidificationImprove compactnessProduct gasAxial length
The invention provides a system and method for forming a disk part by performing two-stage atomizing and spraying. The method comprises the following steps of: performing first-stage atomizing: spraying high-speed inert gas out of an atomizing nozzle for atomizing molten metal to form an atomizing cone; performing second-stage atomizing: colliding metal molten drops in the atomizing cone with a throw-away disk in a flying process, and further refining the molten drops at a high relative speed under the colliding and centrifuging actions of the throw-away disk which rotates at a high speed and the molten drops; and after two-stage atomizing is completed, making the metal molten drops fly towards a receiving mold at a very high speed, performing quick condensation in the process, and depositing and forming on the receiving mold finally, wherein the annular mold rotates at a high speed, and the received semi-solid liquid drops occupy pores generated by depositing under the action of centrifugal force, so that the porosity of a depositing blank is lowered. The annular mold can move up and down along an axial direction during high-speed rotation, and the wall thickness and axial length of a formed piece can be controlled by adjusting axial feeding speed and total feeding amount.
Owner:NORTHWESTERN POLYTECHNICAL UNIV

Construction method of steel pipe concrete column

The invention relates to the building field. The invention relates to a construction method for a concrete filled steel tubular column, comprising the following steps that: a tube is filled with water at first, and then a tremie is put down to the bottom of a pile; concrete is poured into the steel tube by a hopper through the tremie, and a vibrating tamper which is attached to the outerwall of the tube performs concrete vibrating when placing is performed simultaneously; primary concrete placing is performed until the height is 3 to 5 meters on the upper side of a nozzle of the tremie, and the tremie is lifted and guaranteed that the embedding depth of the tremie in concrete is not less than 2 meters; secondary concrete placing is performed, and the vibrating tamper which is attached to the outside of the tube on the bottom layer is started; lifting and placing are repeated, and the concrete is placed to the top of the column; and laitance is removed. The construction method solves the problem of the separation phenomenon caused by overhigh concrete placing height, increases the compactness of the concrete, reduces the number of air bubbles, has small shrinkage clearance between the concrete and the steel tube, can well give play to the function of stress, is convenient in construction, is mechanized, and is simple and convenient in operation. Moreover, the quality can be guaranteed; the equipment is saved by 30 percent; the stability is strong; and 50 percent of raw steel materials and 35 percent of the concrete are saved when the steel tube and the concrete are under same stress, thereby the production cost is effectively reduced.
Owner:DALIAN SANCHUAN CONSTR GROUP

Method for preparing ultralow cement artificial fishing reef concrete by waste concrete

The invention relates to a method for preparing ultralow cement artificial fishing reef concrete and belongs to the field of comprehensive utilization of solid waste. The method for preparing ultralow cement artificial finishing reef concrete is characterized by including grinding dried seawater wet discharge ash until the specific surface area is 500-700m<2>/kg, adding slag powder of the specific surface area of 350-410m<2>/kg, mixedly grinding clinker and desulfurized gypsum until the specific surface area is 450-550m<2>/kg and obtaining binding materials; smashing, autogenously grinding and screening the waste concrete to obtain regenerable crude aggregate and regenerable fine aggregate; according to doping quantity proportion per cubic meter of 300-350kg/m<3> of the binding materials, 800-1300kg/m<3> of the regenerable crude aggregate, 500-800kg/m<3> of the regenerable fine aggregate and 1-3.5kg/m<3> of efficient water reducer and water binder ratio of 0.35-0.5, preparing low-alkalinity concrete fishing reef. By the method for preparing ultralow cement artificial fishing reef concrete, solid concrete is utilized as main raw materials to prepare the ultralow cement artificial fishing reef concrete, preparation cost of the fishing reef is evidently reduced; and further, since the pH (potential of hydrogen) value of prepared fishing reef concrete solution is similar to that of sea water, the ecological environment of aquatic lives around the fishing reef is thoroughly improved.
Owner:UNIV OF SCI & TECH BEIJING

Preparation method of mint essential oil burst beads for cigarettes

ActiveCN107723091AImprove compactnessImprove the airtightness of the cyst wallTobacco smoke filtersEssential-oils/perfumesWater soluble polymersIon
The invention provides a preparation method of mint essential oil burst beads for cigarettes, belonging to the technical field of cigarette processing. The preparation method of burst beads comprisesthe following steps: performing high-speed homogenization and emulsification on mint essential oil, a calcium ion water solution and a surfactant to form an emulsion, directly and dropwisely adding emulsion drops into a sodium alginate water solution through an orifice by controlling the flow velocity of the emulsion at 1-5mL/minute by using a peristaltic pump, enabling the emulsion drops to stayin the sodium alginate solution for 2-40 minutes to obtain calcium alginate beads, taking out the beads, washing the beads with distilled water, putting the beads into an oxidizer water solution, performing soaking for 1-20 minutes, taking out the beads, washing the beads with distilled water, soaking the beads in a water-soluble polymer solution for 5-30 minutes, taking out the beads, washing thebeads with distilled water, and performing natural air drying, thereby preparing the mint essential oil burst beads for cigarettes, of which the grain size is 1-20mm. The mint essential oil burst beads for cigarettes are applied to cigarette filters to achieve the goal of improving the quality of cigarettes.
Owner:WUHAN YELLOW CRANE TOWER NEW MATERIAL TECH DEV

Green rapid-hardening early-strength magnesium phosphate-based healant and preparation method thereof

ActiveCN104909709AImprove compactnessHigh impermeability levelSolid waste managementSilica fumeMagnesium orthophosphate
The invention discloses a green rapid-hardening early-strength magnesium phosphate-based healant and a preparation method thereof. The green rapid-hardening early-strength magnesium phosphate-based healant is composed of a material A and a material B; the material A is prepared via mixing of a phosphate, borax, a toughening ingredient, an accelerating component, a water retention ingredient, a water reducing ingredient, and a grinding aid dispersing agent; and the B material is prepared via mixing of magnesium oxide, flyash, silica fume, ground steel slag, chromium iron tailing slag powder, anhydrite, an expanding agent, and a grinding aid dispersing agent. According to the preparation method, industrial supplementary cementious materials (flyash, silica fume, and ground steel slag) are added into cement, so that cement fluidity and early strength are improved; industrial chromium iron tailing slag powder is added into the green rapid-hardening early-strength magnesium phosphate-based healant as a filling material, so that it is beneficial for cement hydration reaction, set cement compaction rate is increased, and at the same time heavy metal waste solidification is realized. The green rapid-hardening early-strength magnesium phosphate-based healant is capable of achieving balance between magnesium phosphate cement setting time and high early strength, and solving problems that shrinking percentage is large and bonding strength is low.
Owner:WUHAN MUNICIPAL CONSTR GROUP +1

Fiber packing preparation method

A fiber packing preparation method is characterized by comprising the following steps: firstly, on a knitting machine, primary impregnation for fiber threads is preformed through first impregnant on weaving edges, so that the weight of the fiber threads gains 30% to 40%; secondly, the fiber threads after impregnation are taken out, and dried for 4 to 6 hours at the temperature of 90 to 110 DEG C; thirdly, the secondary impregnation is performed through adopting second impregnant for 10 to 20 minutes, and the second impregnant includes paraffin oil; and finally, the forming is carried. Compared with the prior art, the fiber packing preparation method provided by the invention has the advantages as follows: the impregnant is divided into two parts for the twice independent impregnation from start to finish, so that the impregnation is completer, and the improvement on the inner compactness of the packing is facilitated; meanwhile, the paraffin oil is separated out from the lower part at the ordinary temperature, and can be unceasingly separated out for lubrication when the temperature rise reaches to a certain extent during the practical application of the packing, so that the separated out paraffin oil is increased unceasingly to improve the lubrication under the condition that plenty of friction heat is generated, and the service life of the packing is greatly prolonged.
Owner:慈溪博格曼密封材料有限公司

Integrated electric driving system assembly and electric vehicle

The invention relates to an integrated electric driving system assembly. The integrated electric driving system assembly at least comprises a driving motor, a transmission, a motor controller, an aircompressor and a water pump which are integrated; a stator shell of the driving motor is connected with an electric control shell, the motor controller is fixed into the electric control shell, and awiring box is formed between a rear end cover of the driving motor and a stator of the driving motor, communicated with the electric control shell and internally provided with a rotary transform signal insertion piece, a temperature signal insertion piece and a three-phase terminal led out of the motor stator of the driving motor; a three-phase high-voltage power output end of the motor controlleris connected with the three-phase terminal through a three-phase copper bar, and a control end of the motor controller is connected with the rotary transform signal insertion piece and the temperature signal insertion piece through a signal line. The integrated electric driving system assembly is compact in structure, the mounting space is saved, the mounting efficiency is improved, the complicated wiring harness connections are omitted, and the overall reliability is improved. The invention further relates to an electric vehicle.
Owner:重庆长安新能源汽车科技有限公司

Method for preparing heaters by chemical vapor infiltration and resin impregnation, carbonization and densification

The invention discloses a method for preparing heaters by chemical vapor infiltration and resin impregnation, carbonization and densification, comprising the following steps: adopting carbon cloth andshort carbon fiber mesh tires to be laminated alternately to form plane fibers and introducing reinforcing fibres in the vertical direction to prepare three-dimensional heater preforms, carrying outthe followings on the three-dimensional heater preforms in sequence: chemical vapor infiltration and densification processes, resin pressure impregnation, carbonization and densification treatment, high-temperature treatment in high vacuum and mechanical processing, carrying out chemical vapor deposition coating treatment on the surfaces of the heater preforms undergoing mechanical processing, thus obtaining carbon/carbon heaters with high resistivity and higher purity. The method of the invention ensures good densification effect, can evidently prolong the service lives of the carbon/carbon heaters, can improve the product purity under the premise of not reducing the resistance of the carbon/carbon heaters, can greatly improve the heat shock resistance and structural stability of the products and can effectively enhance the erosion resistibility and corrosion resistance under the atmospheres of SiCl4 and HCl of the heaters.
Owner:XIAN CHAOMA SCI TECH
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