49results about How to "Stable and controllable performance" patented technology

The invention relates to a preparation method of graphene and graphene prepared by the method, and is characterized in that the method adopts graphite as a raw material; a graphite intercalation compound is prepared by intercalating metal between graphite layers; and then graphene is prepared by peeling the graphite intercalation compound. The graphene prepared by the method has a length and a width of 5-15000 nm, and a thickness of 0.3-15 nm. The advantages of the invention are that: the raw material source is wide; the cost is low; the preparation method is simple; the product performance is stable and controllable; and the method is suitable for industrial production.

The invention discloses a continuously carbonizing device and method for preparing intermediate product carbonized material of a carbon molecular sieve. Particle objects are carbonized continuously inside a vertical carbonizing furnace provided with multi-section heating furnace temperature control; the furnace temperature distribution of the carbonizing furnace is constant, the processed solid material is carbonized inside the carbonizing furnace after being sequentially subjected to heating, temperature-keeping and cooling; water vapor inside the carbonizing furnace serves as cooling medium, activating agent and protective atmosphere; compositions of the gaseous product generated by the carbonized solid material are stable, the gaseous product has excellent flammability, and is discharged outside after complete combustion; the activated reaction of the processed material is controllable in space and time, and the obtained carbonized material production has stable performance; and the unit equipment has big processing capacity, and the equipment investment and running cost are low. The continuously carbonizing method provided by the invention has the characteristics of high efficiency, low consumption and environmental protection.

The invention relates to a preparing method of a spherical nickel cobalt lithium aluminate cathode material for lithium ion batteries. The method mainly includes: by adopting an organic acid or salt complexing agent solution containing one or more -COO- group and free of ammonia nitrogen groups as a reaction base solution, a step of adding a soluble salt solution of nickel and cobalt and a meta-aluminate solution according to the needed mole ratio of nickel, cobalt and aluminum in the chemical formula of the nickel cobalt lithium aluminate cathode material together with an alkaline precipitant solution into the complexing agent solution, with the complexing agent being sufficiently excessive relative to the total mole of the nickel, the cobalt and the aluminum, the pH value of the reaction system being controlled to be 8-13 through an alkaline precipitant and the reaction temperature being controlled to be 30-90 DEG C; a step of filtering to obtain a spherical nickel cobalt lithium hydroxide precursor after the reaction is finished; a step of fully mixing with a lithium source and grinding; and a step of performing oxidizing roasting. The method is simple in process, environmental friendly, low in energy consumption, low in cost, stable and controllable in product performance and suitable for industrial production.

The invention relates to a method for adjusting the continuous tension of wool warp yarns without a displacement sensor, comprising the following steps: 1) using a limit switch to determine the initial position of the pressure roller; Load pressure between the rolling bearings to the fed wool warp yarn; 3), determine the rotation angle according to the encoder disc of the servo motor, and the controller is based on the following information: rotation angle α, pressure roller radius r, pressure roller connecting rod length l, servo motor shaft O and two rolling bearings and yarn contact points A and B space position coordinates (x a ,y a ) and (x b ,y b ), calculate the real tension in the wool warp; 4), adjust the torque output of the servo motor by comparing the gap between the target tension and the real tension, record the rotation angle of the servo motor, and realize the wool warp tension through real-time calculation continuous adjustment. The invention does not need to install a displacement sensor on the pressure roller, and only uses a servo motor to complete the continuous adjustment of the wool warp yarn tension.

The invention relates to the technical field of material forming, in particular to a method for preparing a foamed metal thin-walled composite pipe with a controllable filling density gradient. According to actual needs, by controlling the variation mode of the hole density gradient and the difference range of the hole density of different specifications of the foamed metal, the obtained Metal foam with flexible and stable and controllable density, and then prepare multi-specification metal foam thin-walled composite pipes with controllable filling density gradient through appropriate connection methods, so as to expand the application range of thin-walled pipes and provide automotive design engineers with more Large design space.

The invention discloses a tensile device and method of anti-seismic buildings, and belongs to the engineering anti-seismic technical field. The tensile device comprises pre-buried fixed tensile piecesand a follow-up limiting piece. According to the different burying positions of the pre-buried fixed tensile pieces in an anti-seismic layer, the pre-buried fixed tensile pieces include the upper pre-buried fixed tensile pieces and the lower pre-buried fixed tensile pieces; when the horizontal shearing deformation of an anti-seismic support reaches a design displacement threshold, the tensile device exerts reverse tensile force on the upper structures of the anti-seismic buildings, the anti-seismic support is prevented from continuing to deform, the horizontal displacement of the anti-seismicbuildings is prevented from exceeding the limit, and the collapsing problem of the high-rise and ultrahigh-rise anti-seismic buildings with large heights is effectively solved; most parts of the device are selected from standard parts, cost is low, construction is simple, the requirement for installation precision is not high, main parts are convenient to replace, performance is stable and controllable, the collapsing problem of anti-seismic buildings can be effectively solved, and the tensile device and method have great significance in increasing the height-width ratio limit value of the anti-seismic buildings and applying the anti-seismic technology to the ultrahigh-rise buildings.

The invention relates to a 3D grapheneized carbon-nickel-hydrogen battery and a preparation method thereof. The preparation method comprises using graphite paper and carbon-containing conductive adhesive as raw materials, coating a layer of carbon-containing conductive adhesive on one side of the graphite paper, drying and curing , to form an electrode material composed of graphite paper and carbon-containing conductive adhesive layer; the other side of the graphite paper is divided into the tab area, the battery reaction area and the rest as the third area, and the third area is coated with hydrophobic glue for sealing and curing; The reaction area of ​​the battery is grapheneized to make a grapheneized carbon positive electrode; the grapheneized carbon electrode is used as the positive electrode, and the hydrogen storage alloy powder and nickel hydroxide powder are mixed and pressed on the foamed nickel sheet as the negative electrode of the battery, polypropylene The membrane is used as the diaphragm, and the potassium hydroxide solution is used as the electrolyte to assemble a 3D graphene carbon-nickel metal hydride full battery. The invention prepares a carbon-nickel-hydrogen battery with high specific energy; the source of raw materials is extensive, the cost is low, the preparation method is simple and environmentally friendly; the performance of the product is stable and controllable, and it is suitable for industrial production.