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120results about How to "Good controllability" patented technology

One-stage method for preparing metal matrix light-weighted composite material

InactiveCN104588617AWell-proportioned holesGood controllabilityMetal matrix compositeEnergy absorption
The invention relates to a one-stage method for preparing a metal matrix light-weighted composite material. The invention uses the method of pressure maintaining percolation and vacuum suction casting to make molten metal immerse into the gaps among hollow spheres by penetrating through a porous ceramic plate or a graphite plate under the function of negative pressure, after the molten metal is cooled down after totally infiltration, and finally, the molten metal is demoulded and taken out, then a foamed metal matrix composite material including closed bubbles can be obtained. The hollow spheres are mixed hollow spheres of two or more than two kinds of Al2O3 hollow spheres, SiC hollow spheres, C hollow spheres or glazed hollow beads of different or same sizes. The porosity of the metal matrix composite material prepared by the method of the invention can reach more than 60% and the density can be obviously reduced, besides, the compression strength can be improved by 20-50% compared with the similar product, so that the high-strength and light-weighted matrix light-weighted composite material with various functions like damp shock absorption, sound insulation and noise reduction, energy absorption can be obtained. According to the one-stage method for preparing the metal matrix light-weighted composite material disclosed by the invention, the process is simple, the procedure is less and the applicable range to the varieties and sizes of the hollow sphere particles is wide, and nearly no selection to the matrix metal, the foam metal products of different densities can be prepared.
Owner:TONGJI UNIV

Biomedical polysaccharide hemostatic and healing sponge and preparation method thereof

The invention discloses biomedical polysaccharide hemostatic and healing sponge and a preparation method thereof, and belongs to the technical field of medical materials. The preparation method comprises the following steps: firstly, dissolving a polysaccharide material carboxymethyl cellulose, hyaluronic acid or a mixture thereof into an alkaline solution, stirring sufficiently, and swelling into colloid; secondly, adding a crosslinking agent into the colloid, stirring sufficiently, incubating into uniform gel, and dialyzing and purifying the obtained gel; thirdly, adding glycerin into the purified product, stirring at a high speed for bubbling, and pouring into a lyophilizing disk; and finally, performing freeze drying at a low temperature to obtain dehydrated sponge. The hemostatic and healing sponge prepared with the method is good in flexibility, do not drop crumbs, is strong in liquid absorption, can provide a wet environment to a wound, is non-stick to the wound, is good in biocompatibility, is qualified in heavy metal detection and endotoxin detection, is non-cytotoxic in a bio-safety test, is free of intradermal irritation and sensitization response, and has the functions of stopping bleeding rapidly, absorbing exudate and promoting wound healing.
Owner:JIANGSU CHANGJIYONG BIOTECH CO LTD

Titanium alloy pipe inner wall magneto-rheological polishing method and device

ActiveCN107791107AGood controllabilityImprove material removal ratePolishing machinesGrinding work supportsApparent viscosityMagnetic current
The invention provides a titanium alloy pipe inner wall magneto-rheological polishing method and device. Magneto-rheological liquid is pumped into a polishing head inner cavity along the inner surfaceof a transmission rod under the effect of a creepage pump, and flows over through rectangular holes around the middle of a polishing head, the liquid flows to the polishing area from the left side and the right side, under the effect of a magnetic field, the apparent viscosity and the shear yield stress of the magneto-rheological liquid are rapidly increased, a Bingham medium with certain viscousplasticity is formed, along with relative motion of the polishing head and the pipe wall, the Bingham medium carries out shear removal on the pipe wall material, the magneto-rheological liquid obtained after polishing is collected through magneto-rheological liquid collecting mechanisms on the two sides of a pipe fitting, through filtering and stirring, the polishing process is continuously carried out, and circular utilization of the magneto-rheological liquid is achieved; in the magneto-rheological liquid circulation process, heat generated in the polishing area is brought away. The inner wall of the titanium alloy pipe can be automatically polished, the beneficial effects of being easy to control, good in polishing uniformity, high in work efficiency and the like are achieved, and themethod and device are particularly suitable for polishing treatment of the inner wall surface of the fine and long titanium alloy pipe.
Owner:NORTHEASTERN UNIV

Rock-soil mass high volume expansion cement slurry expansion process visualization device and use method

The invention discloses a rock-soil mass high volume expansion cement slurry expansion process visualization device. The device includes a cuboid box for holding soil or rock sample, and the cuboid box has an opening top and a sealed bottom. One side of the cuboid box is open and is equipped with tempered glass, the outer surface of the tempered glass is provided with calibrated scale, the inner side of the tempered glass is provided with a pipe for adding expansion cement slurry, the pipe is internally provided with an anchor rod, the anchor rod is equipped with a pressure sensor and a strain gauge, and the output ends of the pressure sensor and the strain gauge are connected to a data acquisition system. The top of the cuboid box is connected to a mounting plate through a support frame, the bottom of the mounting plate is connected to a jack fixed end, the support frame is internally provided with a bearing plate matching the cuboid box top opening, and the jack telescopic end clings to the upper surface of the bearing plate. The invention also discloses a corresponding use method, thus finally realizing the whole process visualization of time-varying cement slurries with different expanding agent contents and the anchor rod pull-out test destruction mode under different soil compactness or ground stress conditions.
Owner:泰州市海通资产管理有限公司

Coiled tubing drilling electric-hydraulic control directional tool

ActiveCN105888550AImprove locking efficiencyGood controllabilityDirectional drillingPistonEngineering
The invention provides a coiled tubing drilling electric-hydraulic control directional tool which comprises a driving part, a hydraulic pump, a reversing valve, a hydraulic cylinder, a drive shaft and a central spindle which are sequentially connected with one another from top to bottom, wherein the hydraulic cylinder comprises a piston, an upper cavity positioned above the piston, and a lower cavity positioned below the piston; the reversing valve is provided with an oil inlet communicated with the hydraulic pump, a first working hole communicated with the upper cavity, and a second working hole communicated with the lower cavity; one end of the drive shaft is connected with the piston; and the other end of the drive shaft can be rotationally connected with the central spindle. According to the invention, flow direction of hydraulic oil is controlled by virtue of the reversing valve, axial reciprocating motion or stop of the piston of the hydraulic cylinder is further controlled, bidirectional rotating or locking of the central spindle is controlled by virtue of the axial reciprocating motion or stop of the drive shaft, and translation is changed into rotation, so that bidirectional continuous control of rotation of a tool face angle can be realized, the tool face is locked by the reversing valve, the hydraulic locking efficiency is improved, and the controllability is high.
Owner:BC P INC CHINA NAT PETROLEUM CORP +2

Niobium-doped lithium titanate anode material for lithium ion battery and method for preparing same

The invention relates to a niobium-doped anode material for a lithium ion battery and a method for preparing the same, belonging to the technical filed of the anode material for the lithium ion battery. The niobium-doped anode material for the lithium ion battery has the chemical formula of Li4Ti5-xNbxO12, wherein the x is equal to 0.05-0.1. The method for preparing the niobium-doped anode material for the lithium ion battery comprises the following steps: mixing niobium source, TiO2 source and lithium source, grinding the mixture by a ball grinder for 6-10h, putting the ground mixture in a muffle furnace, making the ground mixture react at 800-900 DEG C for 16-24h, and naturally cooling the product of reaction to room temperature to obtain the niobium-doped anode material for the lithium ion battery, which has the chemical formula of Li4Ti5-xNbxO12. The method for preparing the niobium-doped anode material for the lithium ion battery uses the raw materials of wide source and no organic chelating agent, is convenient to operate, is controllable and repeatable and ensures that the particles of the niobium-doped anode material for the lithium ion battery are small and are uniform in size and have high crystallinity and the niobium-doped anode material for the lithium ion battery has higher electrochemical performance and is prepared with low cost.
Owner:ANHUI UNIVERSITY OF TECHNOLOGY

Self-assembly controllable preparation method of composite of metal nano particles and carbon materials

The invention discloses a self-assembly controllable preparation method of a composite of metal nano particles and carbon materials. The self-assembly controllable preparation method comprises the steps that carbon material nano carriers are firstly and fully scattered into an ionic liquid solution through ultrasound, and turbid liquid of the carbon material carriers and the ionic liquid is obtained; then the turbid liquid is transferred into a container, various different metal targets are sputtered into the turbid liquid through using a magnetic control sputtering method, and a mixed solution of the ionic liquid, the carbon materials and the metal nano particles is obtained for the time being; and finally, the ionic liquid is washed clean through adopting a high speed centrifugation method and utilizing an organic solvent of acetone, absolute ethyl alcohol or the like, and the nano composite of the metal nano particles and the carbon material carriers formed through self-assembly can be obtained. By using the self-assembly controllable preparation method, various high-quality composites formed by the metal nano particles and the carbon materials can be prepared through a self-assembly process, the size of the metal nano particles can be controlled through selecting different ionic liquid, and the density of the metal nano particles can be controlled through changing a sputtering condition (see the last paragraph of texts and the last picture). The controllability of the self-assembly controllable preparation method is good, extra reducing agents does not need to be added, and no by-product is produced.
Owner:SUZHOU UNIV

Precision machining method for small-aperture rotating shaft symmetric optical cambered elements

ActiveCN107415060ASwitch quicklyGood controllabilityPolishing machinesWorking accessoriesDiamond turningSingle point
The invention relates to a precision machining method for small-aperture rotating shaft symmetric optical cambered elements. The method is based on a precision machine tool for small-aperture rotating shaft symmetric optical cambered elements, and the small-aperture rotating shaft symmetric optical cambered elements made of different workpiece materials are machined by different processes. An inclined shaft superfine milling device, an inclined shaft electrorheological polishing device and a single-point diamond turning device are integrated on a single machine tool, and different machining modes can be switched over rapidly; by a detecting device, on-position measurement and shape error correction on workpieces can be implemented, compensated machining of the workpieces can be realized, and the controllability of a machining path is good; the workpieces are clamped at a time in a machining process, accumulated errors are reduced, assisted working hours are shortened, and the machining precision is improved; the method is suitable for machining and detecting the workpieces with different surface shapes, and interference between a knife and the workpieces can be avoided effectively; the precision machining method is suitable for machining the workpieces made of various materials; and the machining efficiency of surface shapes of workpieces is high.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Preparation method and application of ZnO/TiO2 composite powder

The invention discloses a preparation method and application of ZnO/TiO2 composite powder. The preparation method comprises the following steps: dissolving soluble a zinc salt, a surfactant and butyl titanate in alcohol, and mixing to obtain a raw material liquid; adding a strong base aqueous solution to the raw material liquid under the stirring condition to obtain a mixed liquid; and reacting the mixed liquid at 120-180 DEG C for 8-16h, washing and drying to obtain the ZnO/TiO2 composite powder. The preparation method is relatively low in temperature conditions, good in controllability, simple in preparation and strong in operability, is favorable to industrialized popularization and production, and has wide application prospects. The obtained ZnO/TiO2 composite powder is complete in crystallization, small in original granularity, uniform in distribution and low in agglomeration, and is particularly suitable to be used as an additive for an automobile paint to be applied to the automobile paint, so that the automobile finish coat has the advantages of being plump in lacquer film, level and bright, strong in adhesion force, high in hardness, good in light retention rate, excellent in natural solarization performance and the like.
Owner:ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1

Gate pole sensitive triggering unidirectional thyristor chip and preparation method thereof

The invention relates to gate pole sensitive triggering unidirectional thyristor chip and preparation method thereof. In the gate pole sensitive triggering unidirectional thyristor chip, a surface thin film resistor stripe is connected between a P type connection hole and an N+ emitting region. The preparation method of the gate pole sensitive triggering unidirectional thyristor chip adds steps of LPCVD polysilicon thin film deposition, ion injection polysilicon doping, photoetching thin film resistor stripe, LPCVD oxide layer protection and ion injection doping and annealing between the step of diffusing the N+ emitting region and the step of photoetching groove window. Advantages of the invention lie in: a resistor is added between the gate pole electrode G and cathode electrode K of the thyristor, which may save a resistor during use and reduces influence of temperature to product electrical parameters. The invention can be used in a scale of temperature at -40 DEG C to 110 DEG C. Controllability and consistency of triggering current are great. Scale of I[GT] among batches can be controlled within 20 microamperes. The invention has strong capacity of resisting disturbance and gate pole sensitivity.
Owner:JIANGSU JIEJIE MICROELECTRONICS

Self-flowing meta-aramid and preparation method thereof

ActiveCN102731778APeaceful polymerizationGood controllabilityMonocomponent polyamides artificial filamentOrganosolvThermal decomposition
The invention provides a self-flowing meta-aramid and a preparation method thereof. The preparation method comprises the following steps: 1) dissolving m-phenylenediamine with sulfonic groups and the additive lithium chloride or calcium chloride in a solvent to prepare a solution, maintaining the temperature of the solution to be 80 to 100 DEG C, adding an m-phthalyl dichloride solution, decreasing reaction temperature and adding m-phthalyl dichloride into the solvent of m-phenylenediamine with sulfonic groups under the conditions of inert gas and rapid stirring in 1 to 8 min for a reaction; and 2) adding alkali into the solution obtained in step 1), allowing alkali to react with the solution and adding a quaternary ammonium salt solution for reaction, wherein synthesis reaction is finished after 5 to 7 h, a self-flowing meta-aramid material is obtained, and the self-flowing meta-aramid material has a molecular weight of 2000 to 40000 and a thermal decomposition temperature of 300 to 600 DEG C and can be dissolved in water and most organic solvents. Aramid fibers prepared from the self-flowing meta-aramid material have elongation at break of 2 to 4%, compressive strength of 0.01 to 1.00 GPa, tensile strength of 1000 to 6000 MPa and elastic modulus of 1 to 1.6 MPa. Polymerization in the invention is mild and has good controllability, the structure of quaternary ammonium salt is changed, and dissolving performance of a polymer can be adjusted.
Owner:WUHAN UNIV OF TECH
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