34results about How to "Achieve directional alignment" patented technology

The invention discloses a ceramic bond grinding tool for oriented arrangement of abrasives and a preparation method thereof. The grinding tool is prepared by the method comprising the following steps: 1) the abrasives, a ceramic bond, a dispersing agent and a solvent are taken for mixing a slurry; 2) the obtained slurry is injected in a mold, and is put in a magnetic field with a strength of 1-50 T for magnetizing to obtain magnetized slurry; and 3) the magnetized slurry is dried and demolded to obtain a biscuit; and the biscuit is sintered and cured to obtain the ceramic bond grinding tool. In the ceramic bond grinding tool for oriented arrangement of abrasives, after the slurry is injected in the mold, the slurry is stood in the high-strength magnetic field; under the effect of electromagnetic force, the abrasives rotate to generate oriented arrangement; the ceramic bond grinding tool for oriented arrangement of abrasives is prepared through the oriented arrangement of the abrasives; an effective cutting edge in the grinding of the grinding tool is added; the grinding capacity of the grinding tool is improved; and the grinding surface quality is improved.

The invention relates to solvent-free graphene/CNT (carbon nano tube)/Fe3O4 three-dimensional composite nano-fluid oriented reinforced epoxy resin composite material. Firstly, graphene oxide is compounded with an acidized CNT by a pi-pi bond; then, Fe3O4 is prepared by a coprecipitation method; the Fe3O4 is grafted on the surfaces of the graphene oxide and the acidized CNT, so as to obtain a magnetic graphene/CNT/Fe3O4 three-dimensional composite nano-particle. The magnetic graphene/CNT/Fe3O4 three-dimensional composite nano-particle is taken as a core, and a two-layer structure of a silane coupling agent and a polyether amine low polymer is grafted by a covalent bond, so that an obtained product is in a liquid state under the condition of the near room temperature; the obtained product isadded in an epoxy resin curing agent for curing, so as to obtain the oriented reinforced epoxy resin composite material. A preparation method is simple and easy, so that the graphene and the CNT attached on the graphene can be directionally arrayed in the epoxy resin, and the mechanical property and the thermal property to the epoxy resin can be improved certainly.

The present invention relates to texturing boride-based ceramics and a preparing method thereof, which belongs to the field of structural ceramics material. MB2 powder is used as raw material powder in the present invention (M is Ti or Zr or Hf), and 0 to 40 wt% of beta-SIC powder is fed into the raw material powder. Polymine or acrylic copolymer is used as dispersant to be fed into water to formwater solution. The pH value of sizing agent water solution is adjusted to between 6.5 and 9, the raw material powder is mixed with the sizing agent water solution, and the mixture is defoamed. After sizing agent is casted to be solidified in the magnetic field of 10 to 30 T, the sizing agent is processed under the temperature of 500 to 700 DEG C. hot-press or discharging plasma sintering is used. Compact ceramics of which the relative density is larger than 97% is obtained by the present invention. Ceramics grains are arranged along the height orientation of (001) direction, Loterring orientation factor f(001) is larger than 0.85, and the mechanical property and the antioxygenic property appear obvious anisotropism.

The invention discloses an automatic turning device for a thrust ball bearing ferrule, and belongs to the technical field of bearing production equipment. The automatic turning mechanism comprises a motor, a positioning material channel and a circular check ring, wherein the top surface of the circular check ring is higher than the bottom surface of the positioning material channel; a workpiece inlet and a workpiece outlet of the circular check ring are respectively provided with an inlet stop block and an outlet stop block; the bottom surface of one end, connected with the workpiece inlet, of the positioning material channel is always higher than the end connected with the workpiece outlet; when the two stop blocks fall down, the top surfaces of the two stop blocks are not higher than the bottom surface of the positioning material channel; a positioning mechanism and a detection mechanism are respectively arranged on the two sides of the positioning material channel; through holes for realizing pressing of the positioning mechanism and detection of the detection mechanism are respectively formed in two side baffles of the positioning material channel; a quantification mechanism is arranged on the side of a material feeding channel; a control system controls a motor, a positioning pressing block driving mechanism, a probe driving mechanism and a quantification mechanism and drives cylinders of the inlet stop block and the outlet stop block to operate. The automatic turning device meets the demand that the end faces of the ferrule are needed to uniformly face to a direction during processing of the thrust ball bearing ferrule.

The invention provides a preparation process of a composite material laminated plate formed by directionally arranging carbon naon-tubes. The preparation process is characterized by comprising the following steps: (1) mixing acetone with carbon nano-tubes in a mass ratio of 100: 1, stirring for 5 min by using a high-speed cutting stirrer at the stirring rate of 20000 r/min, and drying for standby use; ..., (5) hot pressing and forming a prepreg with the upper surface and lower surface respectively laid with a copper film electrode in a composite material hot vulcanizing instrument, first heating to 40 to 60 DEG C, respectively introducing high-frequency pulse alternating-current power to the copper film electrodes at the upper end and lower end of the prepreg, wherein the electrification time is 5 to 10 minutes, removing the power after the electrification, then heating to a curing temperature of epoxy resin, thermally insulating for 2h, naturally cooling, and demolding to prepare the composite material laminated plate of carbon fiber/epoxy resin filling the carbon nano-tubes. According to the preparation process, the carbon naon-tubes are directionally arranged along the thickness direction (direction Z) of the laminated plate by utilizing a high-frequency pulse electric field, so that the preparation process is simple to operate, and the produced composite material has excellent performance.

This invention provides an OFET device and its preparation method including an orientation transfer layer for transferring orientation efficiency, which can increase the carrier mobility of the OFET since the orientation transfer layer is the insulation one. Said one is a mono-film formed by processing the surface with silane coupler which can optimize the orientation result of the orientation layer and transfer it to the organic layer. This invention can improve molecular arrays of the organic molecular layer by transferring the orientation result to improve the carrier mobility of the OFET devices applying said orientation layer.

The invention relates to the technical field of nervous tissue engineering materials, and particularly provides a chitosan-based nerve fiber membrane, a preparation method, a nerve conduit and application. The chitosan-based nerve fiber membrane is formed by a plurality of composite nanofibers which are arranged in an directional manner; each composite nanofiber is of a core-shell structure, a shell layer of each nanofiber comprises a degradable functional material, a hydrophilic functional group modified carbon nanotube, lycium barbarum polysaccharide and chitosan and/or a chitosan derivative, and a core layer of each nanofiber comprises a nerve growth factor and a stabilizer. The chitosan-based nerve fiber membrane disclosed by the invention has the characteristics of good orientation arrangement, good mechanical property and high biological responsiveness; and during degradation, the chitosan and/or chitosan derivative hydrolysate and alkalinity of amino groups carried by the chitosan and/or the chitosan derivative hydrolysate can effectively neutralize weak acidity of degradation products, influences of acidic degradation products on the surrounding environment and tissues areavoided, and therefore the fiber membrane can be applied to nerve repair and regeneration of human bodies and animal bodies.

The invention discloses a directional silk distribution short carbon fiber thermoplastic resin based prepreg preparation device and method and belongs to the field of composite material preparation. By utilizing the special structure of a vibration sieve, through the restriction effect of vibration sieve holes, carbon fiber silks which fall off through vibration from slender sieve holes to performvertical motion of a free falling body; when one ends of the fiber silks are adhered to a resin film in the falling process, the carbon fiber silks are reversely fixed by utilizing the viscosity of the resin film and one-way relative motion of the carbon fiber silks and a two-dimensional movement platform, directional arrangement and uniform distribution of carbon fibers in a movement direction are realized, and the problems of uneven distribution and difficulty in orientation of short carbon fibers in thermoplastic resin are well solved; and through control on a movement speed of the two-dimensional movement platform and control on number of times of laying, accurate control on the content of the carbon fibers in a prepreg is realized, orientation of the carbon fiber silks can be an arbitrary two-dimensional direction, crossing distribution of multiple layers of resin films and multiple layers of carbon fibers is realized, and the mechanical performance of a carbon fiber composite material is improved.

The invention discloses a magnetic field induced arrangement carbon fiber heat conduction material and a preparation method thereof, and relates to the technical field of heat management. The magnetic field induced arrangement carbon fiber heat conduction material comprises, by mass, 5-80% of carbon fibers, 10-85% of a polymer matrix, 5-15% of a curing agent, 5-15% of a film forming agent and 0.1-1% of a catalyst. The method comprises the following steps: adding 5-80% of carbon fibers into a polymer matrix, and carrying out mechanical stirring and ultrasonic dispersion to obtain a dispersion; adding a film-forming agent and a catalyst into the dispersion, and then carrying out mechanical stirring for less than or equal to 1 min to obtain a mixture; transferring the mixture into a glass or other non-magnetic container; the container and the mixture are transferred into a magnetic field, one surface of the container is perpendicular to the magnetic induction intensity direction, the mixture is changed into a solid state from a liquid state, and the mixture is moved out of the magnetic field; and transferring the solid mixture to an electrothermal constant-temperature blast drying box, and further heating and curing to obtain the directionally-arranged carbon fiber heat-conducting material.

The invention relates to an orientation heat transfer hexagonal boron nitride/cordierite textured ceramic and a preparation method thereof, in particular to textured ceramic and a preparation method thereof. The invention aims to solve the problem of small heat conductivity difference between a direction of the h-BN textured ceramic perpendicular to a slice layer and a direction of the h-BN textured ceramic parallel to the slice layer. The orientation heat transfer hexagonal boron nitride/cordierite textured ceramic is prepared from the components in mass fraction: h-BN powder, MgO powder, nanometer Al2O3 powder and melted quartz powder. The preparation method comprises the steps of weighing the raw materials, mixing the raw materials, evaporating, drying and sieving; then loading into a graphite die, prepressing to obtain a blank body, and finally hot pressing and sintering. According to the orientation heat transfer hexagonal boron nitride/cordierite textured ceramic and the preparation method thereof provided by the invention, the hexagonal boron nitride/cordierite textured ceramic with a texture characteristic is prepared through a hot pressing and sintering technology, and theorientation degree of h-BN crystal particles is improved, so that the orientation heat transfer of the h-BN ceramic is realized, and the heat conductivity difference between the direction perpendicular to the slice layer and the direction parallel to the slice layer is 12.2 times. The orientation heat transfer hexagonal boron nitride/cordierite textured ceramic and the preparation method thereofprovided by the invention are applicable to preparing a textured ceramic heat protection material.

The present invention provides a metallic ink with an imitation aluminum foil effect. The problem of luster lack of inks using water as a main solvent is mainly solved. The metallic ink contains 50% of an aqueous emulsion, 20% of 1200 mesh silver powder, 10% of water, 15% of alcohol, 2% of a dispersant, 1% of an antifoaming agent and 2% of butyl ether. The metallic ink has a suitable viscosity, asuitable levelability and a high adhesion.

The invention discloses a preparation method of a piezoelectric ferroelectric ceramic material based on a 3D printing technology. The preparation method comprises the following steps: step 1, preparing lead-based or lead-free piezoelectric ferroelectric ceramic pre-sintered powder; step 2, preparing 3D printing piezoelectric ferroelectric ceramic slurry from the lead-based or lead-free piezoelectric ferroelectric ceramic pre-sintered powder and adding a template accounting for x% of of the ceramic pre-sintered powder, wherein x is larger than 1 and smaller than or equal to 5; step 3, realizing directional arrangement of the template in the powder through a 3D printing photocuring process so as to prepare a 3D-printed piezoelectric ferroelectric ceramic green body; and step 4, degreasing and sintering the 3D-printed piezoelectric ferroelectric ceramic green body to obtain the piezoelectric ferroelectric ceramic material with a texture degree based on the 3D printing technology. According to the method, the mode of scraping via a scraper in a 3D printing process is applied to the directionally-arranged template, and the template with a certain size can be transversely distributed in each layer of the cured green body, so the preparation method of piezoelectric ferroelectric textured ceramic is not limited to a traditional tape casting method any more.

The invention relates to a regulating device for an internal combustion engine, having an intake line (12), an exhaust gas recirculation line (16) connected to the intake line (12), wherein the intake line (12) and the exhaust gas recirculation line are formed. The housing (10) of the circulation line (16), the shaft (28) used as the axis of rotation (30), on which the adjustment body (36) is eccentrically supported, the shaft is perpendicular to the intake line ( 12) and the central axis of the exhaust gas recirculation line (16), wherein in the first end position in which the intake line (12) is at least throttled upstream of the connection of the exhaust gas recirculation line (16) The normal vector of the first surface (44) of the regulating body (36) points to the upstream side of the intake line (12); while the regulating body The normal vector of the second surface (50) of (36) points towards the exhaust gas recirculation line (16). The disadvantage is that the introduction of exhaust gas disturbs the flow and leads to increased condensation and increased flow resistance. In order to solve this problem, it is proposed according to the invention to construct guide ribs (52) on the second surface (50), when the exhaust gas recirculation line (16) is opened, the exhaust gas flows along the guide ribs into the intake line ( 12).