19results about How to "Change the microstructure" patented technology

The invention relates to the technical field of laser cutting, in particular to a laser cutting device and a cutting method thereof.The laser cutting device comprises multiple supporting legs, a cutting mechanism is installed at the tops of the multiple supporting legs, the cutting mechanism comprises a conveying frame, and the conveying frame is fixedly installed at the tops of the supporting legs; the number of the conveying frames is two, a first motor is fixedly installed on the side portion of the right conveying frame, the conveying rollers are rotatably installed in the conveying frames, the number of the conveying rollers is two, an output shaft of the first motor is fixedly connected with the rear conveying roller, and a conveying belt is installed on the surfaces of the conveying rollers. Through the arrangement of the cleaning mechanism, the surface of a material needing to be subjected to laser cutting can be subjected to water spraying cleaning, after impurities such as oil stains, dust and an oxide layer on the surface of the material are cleaned, a laser beam can accurately act on the pure surface of the material, and extra impurities cannot be generated on the cleaned surface of the material in the laser cutting process.

The invention discloses a medicinal silica gel desiccant with high adsorption speed and a preparation method thereof, and belongs to the technical field of desiccant preparation. The medicinal silica gel desiccant with high adsorption speed is prepared from the following components in parts by weight: 50-65 parts of silica gel, 4-8 parts of calcium chloride, 3-6 parts of magnesium sulfate, 3-7 parts of ferric oxide, 1-4 parts of an antibacterial compound, 5-10 parts of a modified surfactant, 1-2 parts of potassium hydroxide, 10-30 parts of ice water, 2-4 parts of acrylic acid, 2-4 parts of acrylamide and 0.4-0.8 part of sodium carboxymethyl starch. 0.2 to 0.3 part of benzoin dimethyl ether, 0.005 to 0.015 part of polyethylene glycol diacrylate and 1 to 2 parts of methanol. The silica gel desiccant prepared by the method has excellent antibacterial performance, adsorption rate and adsorption capacity.

The invention provides salt-spray-resistant steel, a preparation method and application of the salt-spray-resistant steel. The salt-spray-resistant steel sequentially comprises an alloy matrix, a permeable layer and an anti-corrosion coating from inside to outside. The alloy matrix comprises an Fe element; the permeable layer comprises Fe, N and O elements; the anticorrosive coating covers at least the surface of the permeable layer. The steel has the characteristics of high strength and salt spray resistance, the binding force of the coating and a matrix is good, the thickness of the anti-corrosion coating is greatly reduced under the condition that the anti-corrosion requirement of the CX grade is met, the machinable performance of a workpiece is effectively improved, and the adverse effects that the workpiece meshing force is poor, and the surface is not uniform due to the thick coating are avoided.

The invention provides a preparation method of a sodium-ion battery negative electrode material with both high capacity and high first effect. According to the invention, biomass is used as a precursor of the hard carbon negative electrode material, the precursor is subjected to acid pickling purification, then is subjected to pre-oxidation treatment, and then is subjected to high-temperature secondary carbonization to prepare the hard carbon material with excellent electrochemical performance. The preparation method is simple to operate and low in cost, the obtained biomass derived hard carbon negative electrode material is applied to the sodium-ion battery, high capacity and high first efficiency can be both considered, meanwhile, excellent rate capability is shown, and reference significance is provided for preparation of the high-performance sodium-ion battery.

The invention belongs to the technical field of polyurethane materials, and particularly relates to a compression-resistant and shear-resistant polyurethane material for an expressway bridge support and a preparation method of the compression-resistant and shear-resistant polyurethane material. The water-based polyurethane resin is prepared from a component A and a component B, the component A comprises polyether glycol, a micromolecular chain extender, an anti-hydrolysis agent, a catalyst and an inorganic filler, the component B comprises polyether triol, polyether glycol and diisocyanate, and the polyether glycol is polytetrahydrofuran ether glycol with the number-average molecular weight of 2000g / mol; the polyether trihydric alcohol is polyether trihydric alcohol with the number-average molecular weight of 494 g / mol, and the polyether trihydric alcohol is prepared through a reaction of trimethylolpropane and tetrahydrofuran. According to the invention, polyether triol prepared by reaction of trimethylolpropane and tetrahydrofuran is used as a raw material of the component B, so that the pressure resistance and crystallization resistance of the material can be improved while better shear modulus, mechanical strength, low-temperature flexibility and hydrolysis resistance of the traditional PTMG type polyether are maintained, the use temperature range is enlarged, and the service life of the material is prolonged.

The present invention discloses a coating process for a multi-lumen tube for blood collection, which belongs to the technical field of medical tools. The technical scheme includes the following steps: 1) Pretreatment: Select a multi-lumen tube to be coated, place the multi-lumen tube in a constant temperature drying oven for constant temperature drying, place the multi-lumen tube in a dust-free environment after drying, and cool to room temperature; 2) Section cleaning: Use a dust-free cloth dipped in an organic solvent to clean and wipe the end face of the multi-lumen tube; 3) Plasma surface treatment: Place the wiped multi-lumen tube in a surface treatment machine for surface treatment; 4) Injection molding coating: Place the multi-lumen tube on a coating mold for injection molding coating. The present invention solves the problem that it is difficult to effectively weld and coat the multi-lumen tube and the multi-lumen tube joint by performing a plasma pretreatment process on the end face, selecting a highly soluble organic solvent, and adopting a suitable injection molding coating process, thereby reducing the unqualified rate in the production process and improving production efficiency and product quality.

This invention discloses a method for preparing a ruthenium-doped nickel-iron-based heterostructure catalyst and its application. The preparation method includes the following steps: dissolving oxalic acid and an iron salt in water to obtain an iron precursor solution; placing nickel foam in the iron precursor solution for a hydrothermal reaction to form a nickel-iron-based heterostructure on the nickel foam; and placing the nickel foam with the nickel-iron-based heterostructure in a ruthenium salt solution for an impregnation reaction to obtain the ruthenium-doped nickel-iron-based heterostructure catalyst, wherein ruthenium is doped within the crystal lattice of the nickel-iron-based heterostructure. The ruthenium-doped nickel-iron-based heterostructure catalyst prepared by this invention can be applied to the electrocatalytic water splitting reaction and exhibits good electrocatalytic total water splitting performance.

The invention relates to the technical field of wool fabrics, and particularly discloses a biological enzyme treatment method for a soft skin-friendly wool fabric. The biological enzyme treatment method for the soft skin-friendly wool fabric comprises the following steps: dispersing trypsin in water, stirring, adding carboxyl-terminated polyamidoamine, stirring in a constant-temperature water bath, adjusting the pH value of a system to 7.5-8, centrifuging and evaporating to obtain embedded trypsin; the preparation method comprises the following steps: dissolving sorbitol in absolute ethyl alcohol, adding stearic acid, stirring in a constant-temperature water bath, cooling and evaporating to obtain modified sorbitol; dispersing the embedded trypsin in water, adding the modified sorbitol, stirring in a constant-temperature water bath, cooling, and collecting filtrate to obtain activated bio-enzyme; dispersing the wool fabric in water, adding activated bio-enzyme and papain, stirring in a constant-temperature water bath, washing and air-drying. The wool fabric treated by the method is high in softness, good in skin friendliness and shrinkage resistance, simple in preparation method and suitable for large-scale popularization and application.

The invention discloses a preparation method of a metamaterial with negative dielectric and dielectric near-zero response, and relates to the field of electromagnetic metamaterials with negative dielectric response, in particular to a metamaterial with negative dielectric and dielectric near-zero response characteristics designed through a carbon black / polyaniline and polyaniline laminated structure. The carbon black / polyaniline laminated metamaterial has the performance characteristics that an adjustable negative dielectric constant and a dielectric near-zero effect are realized in a frequency band of 100Hz-50MHz, and the specific preparation method is as follows: the carbon black / polyaniline laminated metamaterial takes carbon black as a functional phase and polyaniline as a matrix phase, and the carbon black is randomly distributed in the polyaniline matrix by adopting a ball milling process to form a three-dimensional conductive network; according to the present invention, the carbon black / polyaniline content ratio and the lamination thickness ratio are controlled so as to change the microstructure of the metamaterial, such that the adjustable negative dielectric and the dielectric near-zero response can be achieved, and the negative dielectric response and the dielectric near-zero performance regulation and control process of the prepared lamination metamaterial is changed according to the carbon black / polyaniline mass ratio, the lamination thickness ratio, the pressing pressure, the pressing time and other conditions.

The invention provides a treatment process of straw plaited materials and application of the straw plaited materials in a preparation bag, and relates to the technical field of straw plaited materials. The treatment process of the straw plaited material comprises the following steps: removing impurities and dead leaves from straw stems without diseases and insect pests as raw materials, and rinsing with water; soaking for 2-3 hours by using a potassium permanganate aqueous solution with the mass concentration of 0.5-1%, and washing for 3-5 minutes by using water after soaking; boiling the straw stalks treated by the potassium permanganate aqueous solution in a softening agent for 1-2 hours; soaking the straw stalks treated by the softener in an enhancer for 3-5 hours, and then washing the residual enhancer on the surface by using clear water; and drying the straw stalks treated by the reinforcer in a drying machine at the temperature of 40-50 DEG C until the water content is 6-8%. According to the treatment process of the straw plaited material, the toughness and the strength of the treated material can be effectively improved while the anti-corrosion performance of the straw plaited material is improved.

The invention discloses a guide rail processing device, which belongs to the field of guide rail surface processing, and comprises a workbench, an X-axis moving unit arranged on both sides of the workbench, a Y-axis moving unit fixedly connected to the moving end of the X-axis moving unit, a Z-axis moving unit fixedly connected to the moving end of the Y-axis moving unit, and a guide rail surface rolling processing unit fixedly connected to the moving end of the Z-axis moving unit; the outer surface of the guide rail is polished during the rolling processing, so that tiny defects and initial stress concentration points on the surface can be removed, so that the surface stress distribution is more uniform, and the surface can be made smoother, and the possibility of stress concentration during the rolling process can be reduced, thereby reducing the initial stress; grinding is performed synchronously during the rolling process, so that the hardened layer formed after rolling can be removed, so that the surface hardness is kept within a reasonable range, excessive hardening is prevented, the guide rail surface is smoother, and friction and wear are reduced.

The invention relates to sprayed concrete and a preparation method thereof, and relates to the technical field of concrete.The sprayed concrete is prepared from, by weight, 365-410 parts of cement, 790-830 parts of fine aggregate, 710-760 parts of coarse aggregate, 70-100 parts of fly ash, 75-95 parts of modified yellow phosphorus slag, 12-16 parts of accelerator, 4.5-7 parts of water reducer, 3-6.5 parts of natural plant admixture and 155-175 parts of water; the natural plant additive is prepared from beet root tubers and gelidium amansii in a weight ratio of (1-2): (5-9). On the basis of an existing shotcrete batching system, the natural plant admixture and the modified yellow phosphorus slag are introduced, all the components have a synergistic effect, the construction requirements for the initial strength and the later strength of the shotcrete are met, the rebound rate of the shotcrete is remarkably reduced, and the shotcrete has a good application prospect. The method can be widely applied to construction of various supporting projects such as tunnels and roadways.

The invention discloses a method for preparing a magnesium alloy material through lattice defect regulation and control, and the method specifically comprises the following steps: step 1: firstly, carrying out precise batching, heating pure Mg until the pure Mg is molten, adding pure Zn, an Mg-Ce intermediate alloy and an Mg-Nd intermediate alloy after the pure Mg is molten, and introducing inert protective gas at the same time; 2, the melt obtained in the step 1 is heated to be completely melted, then heat preservation and standing are conducted, and a magnesium alloy melt is obtained; 3, the magnesium alloy melt obtained in the step 2 is poured into a preheated mold to be formed, and a magnesium alloy ingot is obtained after cooling; 4, the magnesium alloy ingot obtained in the step 3 is heated and homogenized; 5, the magnesium alloy treated in the step 4 is extruded; 6, the magnesium alloy treated in the step 5 is subjected to heat treatment, and pre-compression deformation treatment is conducted; and 7, the magnesium alloy obtained in the step 6 is subjected to heat treatment, and the magnesium alloy material is obtained.

The present invention belongs to the technical field of sorghum cultivation, and specifically relates to a sorghum drought-resistant and water-saving cultivation method, comprising the following steps: S1, before sowing, deep ploughing the soil, raking the soil, removing weeds and stones, applying fertilizer, and watering the soil; S2, selecting sorghum varieties adapted to local climate and soil conditions, sowing in the form of hole sowing, row sowing or broadcasting, and irrigating according to soil moisture and weather conditions; S3, thinning out seedlings when 3-4 leaves emerge, finalizing seedlings when 5-6 leaves, intertillage cultivation for finalizing seedlings, intertillage cultivation again after 10-15 days, and spraying composite drought-resistant plant hormones on leaves and roots during jointing and heading stages; S4, performing field management, and applying topdressing during jointing and heading stages; S5, harvesting at the late stage of sorghum filling. The present invention not only improves the drought-resistant and water-saving ability of sorghum, achieves the goal of high yield and high quality, but is also easy to operate and reduces production costs.

The invention relates to a processing method for improving the hardness of an aluminum alloy, which comprises the following steps: (1) carrying out cold rolling treatment on an aluminum alloy round ingot, namely sequentially carrying out first-pass cold rolling, second-pass cold rolling, third-pass cold rolling and fourth-pass cold rolling in a clockwise direction or an anticlockwise direction, the direction of each pass of cold rolling is in the radial direction of the round ingot; and (2) the cold-rolled ingot obtained in the step (1) is subjected to annealing treatment, and the processed aluminum alloy is obtained. According to the machining method, the hardness of the aluminum alloy can be effectively improved, meanwhile, high tensile strength and yield strength are kept, and high machining efficiency is achieved.

The invention particularly relates to an electrolyte additive, an electrolyte, a copper foil and a preparation method and application of the copper foil. The electrolyte additive comprises sodium dithiodipropane sulfonate, sodium alcohol thiopropane sulfonate, isothiourea propyl sulfate, polymer glue and a thiourea compound. The copper foil prepared by adopting the electrolyte additive disclosed by the invention has high tensile strength and high elongation, the tensile strength at normal temperature is greater than or equal to 640MPa, the elongation is greater than or equal to 5.0%, the defect that the high tensile strength and the high elongation mutually restrain is overcome, and the performance of the lithium ion battery can be greatly improved when the electrolyte additive is applied to the production of the lithium ion battery.

The application belongs to the technical field of permanent magnetic materials, and particularly relates to a ferrite permanent magnetic material and a preparation method thereof. The ferrite permanent magnetic material comprises a base material and an additive material, and the base material comprises, by weight fraction, 80-90 parts of iron oxide, 5-10 parts of strontium oxide, 8-12 parts of nano-magnesium oxide and 2-3 parts of barium carbonate. The additive material comprises an additive and a dispersing aid. The additive comprises calcium carbonate, silicon dioxide and bismuth oxide. The ferrite permanent magnetic material obtained by optimizing the formula and the preparation method is free of cracks, has high density, and effectively improves the coercive force, intrinsic coercive force and remanence, and has excellent overall performance and good processing performance.

The invention belongs to the technical field of metal composite materials, and provides a high-toughness corrosion-resistant aluminum-magnesium composite board and a preparation method and application thereof. The composite board comprises a first aluminum alloy layer, a magnesium alloy layer and a second aluminum alloy layer which are sequentially stacked. The aluminum alloy layer comprises the following components: 3.0 to 5.5 percent of Mg, 0.3 to 1.2 percent of Mn, 0.1 to 0.4 percent of Si, 0.15 to 0.4 percent of Fe, 0.05 to 0.75 percent of Cu, 0.1 to 0.3 percent of Sc and the balance of Al; and the magnesium alloy layer comprises the following components: 2.0%-4.0% of Al, 1.5%-4.0% of Ca, 0.2%-1.0% of Mn, 0.1%-0.5% of Be, 0.5%-2.0% of Sn and the balance of Mg. By reasonably setting alloy components and selecting an asynchronous rolling process, the problems that the interface bonding strength in the aluminum-magnesium composite material is insufficient and a brittle and hard second phase is easy to generate are effectively solved.

The invention provides a preparation method of a large-area ultrathin perovskite single crystal. The preparation method comprises the following steps: S1, obtaining a perovskite seed crystal; s2, putting the perovskite seed crystal in the step S1 into a first solvent, and heating to carry out heat treatment on the perovskite seed crystal to change a surface microstructure; s3, placing the treated perovskite seed crystal in a glass container, sequentially adding a second solvent and a perovskite precursor growth solution, and placing the glass container on a heating stage to obtain a perovskite single crystal with the thickness of 1-2cm; s4, fixing the perovskite single crystal on a glass sheet by using paraffin, cutting off seed crystals in the perovskite single crystal by using a blade, and thinning the perovskite single crystal to obtain a large-area ultrathin perovskite single crystal wafer; wherein the second solvent in the step S3 is immiscible with the perovskite precursor growth solution, and the density of the second solvent is smaller than that of the perovskite precursor growth solution. The method has the advantages of inhibiting the growth of the crystal in the vertical direction, reducing the carrier recombination rate and reducing the crack and breakage probability.