19results about How to "Improve surface topography" patented technology

The invention discloses an electrocatalyst material for in-situ production of hydrogen peroxide through oxygen reduction as well as a preparation method and application of the electrocatalyst material, and belongs to the field of organic wastewater treatment. MoS2 / Fe porous conductive particles and a high-molecular polymer are adopted as main components, and ethanedioate and polyacrylamide are combined as a dispersion auxiliary solvent and a pore-forming agent to form a three-dimensional composite conductive catalyst material; through ultralow-temperature freeze drying and microwave radiation technologies, the material structure is optimized, the catalytic reaction active sites are improved, and efficient electrocatalytic oxygen reduction for in-situ production of hydrogen peroxide is realized; the MoS2 / Fe porous conductive particles not only optimize the performance of the catalyst, but also realize high-valued utilization of solid wastes; the electrocatalyst material has excellent conductivity, catalytic activity and organic wastewater degradation capability, is stable in removal effect before and after use, can be repeatedly used for multiple times, reduces the use cost, and provides a wide application prospect for the fields of environmental protection, energy and the like.

The invention discloses a liquid phase growth method of n-type silicon carbide crystals, and belongs to the technical field of semiconductors. By changing the formula of a growth raw material for silicon carbide growth, the growth raw material is configured to be SixCryMz, the molar ratio x of Si to the raw material is 40-70%, the molar ratio y of Cr to the raw material is 20-60%, and the molar ratio z of M to the raw material is 1-10%; m is one or more of Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Ce, La, Tb, Nd, Ta and Pr. According to the method, other elements M are doped on the basis of a Si-Cr system, the liquid growth method is matched to replace an Al element to improve the crystal morphology, meanwhile, evaporation of solution components can be inhibited, and the growth system can be kept stable for a longer time, so that the n-type silicon carbide crystal with more uniform surface steps can be grown.

The application provides a microcapsule, a composite fabric, a preparation method of the composite fabric and a summer quilt. The preparation method of the composite fabric comprises the following steps: A1, treating the top surface and the bottom surface of a moisture-permeable layer by using oxygen plasma; A2, adding microcapsules and a crosslinking agent into water to obtain a sticky liquid; coating the sticky liquid on the bottom surface and the top surface of the moisture-permeable layer in a dotted form, bonding the moisture-permeable layer and a moisture-removing and air-permeable layer by taking the top surface of the moisture-permeable layer as a bonding surface, bonding the moisture-permeable layer and a skin-friendly cool layer by taking the bottom surface of the moisture-permeable layer as a bonding surface, drying and hot pressing; the microcapsule comprises a core material and a shell covering the outside of the core material, the core material comprises a glue, and the glue is selected from glue A or glue B or a combination of the two, the glue A is a solvent-free moisture curing reaction type polyurethane hot melt adhesive, and the glue B is an acrylate with an epoxy group and / or a urethane group. The application can guarantee the moisture permeability and air permeability of the composite fabric.

The utility model discloses a wafer carrying system, including, workstation, be provided with transfer station, rough grinding station and fine grinding station on the workstation, bearing platform, set up in the workstation for carrying wafer and will wafer transfer between transfer station, rough grinding station and fine grinding station, cleaning unit, be provided with the workstation, with the interval setting of bearing platform, transfer unit, will the wafer after grinding be directly transferred from the bearing platform of transfer station to cleaning unit. Wafer carrying system disclosed in the utility model, after rough grinding and fine grinding to wafer, directly transfer to cleaning unit and clean, simplify the transfer process, in time through the corrosion damage layer, release residual stress, prevent the wafer after thinning from breaking due to damage stress, and optimize wafer surface topography.

The invention discloses a 3D printing porous medical titanium alloy and a preparation process thereof, and relates to the technical field of medical titanium alloys, and the preparation process comprises the following operation steps: S1, cleaning a 3D printing porous titanium alloy sample piece to obtain a 3D printing porous titanium alloy prefabricated piece; s2, primary micro-arc oxidation is conducted, specifically, the 3D printing porous titanium alloy prefabricated part is placed in electrolyte to be subjected to primary micro-arc oxidation, and a 3D printing porous titanium alloy prefabricated part A is obtained; s3, the 3D printing porous titanium alloy is subjected to acid treatment, and a 3D printing porous titanium alloy prefabricated part B is obtained; s4, secondary micro-arc oxidation is conducted, specifically, the 3D printing porous titanium alloy prefabricated part B is placed in electrolyte to be subjected to secondary micro-arc oxidation, and a 3D printing porous titanium alloy prefabricated part C is obtained; s5, the 3D printing porous titanium alloy prefabricated part C is cleaned; transferring into a fibroin solution, and taking out; and irradiating for 8-15 minutes under an ultraviolet lamp, cleaning and drying to obtain a finished product.

The invention relates to the field of carbon dioxide capture and conversion utilization, and discloses a base material which comprises a base CO2 adsorption component and a CO2 catalytic activity component, wherein the basic group CO2 adsorption component is selected from zirconate; the CO2 catalytic active component is selected from at least one of VIII group metals. The base material has the characteristic of high CO2 adsorption-catalytic cycle stability.

The invention belongs to the field of chromatographic stationary phase materials, and particularly relates to a hollow spherical carbon superstructure derived from a covalent organic framework as well as preparation and application of the hollow spherical carbon superstructure. The invention provides a covalent organic framework-derived hollow spherical carbon superstructure which is formed by taking PCP-CHO as a construction unit to be subjected to an aldehyde amine condensation reaction with TAPD-NH2 under a solution heat condition to obtain small spherical particles (COF-S), and performing self-assembly on an oil-water interface and then performing heat treatment. The invention not only introduces a new method for constructing a carbon superstructure with a controllable form, but also provides a blueprint for obtaining NCA177Lu and separating lanthanide metal ions with similar physical and chemical properties, and highlights the further development potential of material science, especially in the aspects of chromatography and ion separation technologies.

The application discloses a boron nitride van der Waals epitaxial gallium nitride microwave material and a growth method. An ammonia-rich aluminum nitride nucleation layer is introduced on the surface of a boron nitride two-dimensional material, thereby providing high-density nucleation sites for the growth of a subsequent gallium nitride transition layer. The aluminum nitride nucleation layer is subjected to annealing treatment to block grain boundary dislocations. A gallium nitride transition layer with low temperature and high V / III ratio is introduced to promote a lateral epitaxial mode in the initial growth of the gallium nitride, thereby accelerating the turning and blocking of threading dislocations. The growth process of a gallium nitride buffer layer is high-temperature and low-V / III-ratio, thereby promoting the gallium nitride buffer layer to be in a layered epitaxial mode, improving the material surface morphology and crystal quality. A gallium nitride channel layer with high temperature and high V / III ratio is introduced to improve the electron transport characteristics. The technical scheme is based on a material growth method such as MOCVD, and the material is developed through one-time epitaxy technology. Through epitaxy technology improvement and process control, the material with high surface flatness, crystal quality and electron transport characteristics is developed.

A welding method for reducing residual stress and improving surface morphology in thick steel plates is disclosed, relating to the field of welding. The method includes the following steps: applying a large-diameter impact head to the target area of ​​the weld joint on the thick high-strength steel plate using full-coverage ultrasonic impact treatment; and applying a small-diameter impact head to the target area of ​​the weld joint on the thick high-strength steel plate using full-coverage ultrasonic impact treatment. This method utilizes the deep strengthening function of the large-diameter impact head and the surface finishing function of the small-diameter impact head to achieve a synergistic effect, reducing residual stress in the thick high-strength steel plate while simultaneously lowering surface roughness.

The invention provides a positive electrode slurry preparation method, a positive electrode slurry, a battery positive electrode and a lithium battery, and the method comprises the following steps: mixing a lithium-rich manganese oxide positive electrode material, a conductive agent, a dispersant, a binder, phosphoric acid and phosphate to form the positive electrode slurry; wherein the pH (Potential of Hydrogen) of the positive electrode slurry is 7.5 to 8.0. The phosphoric acid and the phosphate can reduce the pH value of the positive electrode slurry and maintain the positive electrode slurry in a weakly alkaline state, so that corrosion of the positive electrode slurry to a current collector is inhibited, and the stability and the cycle performance of the battery are improved. The phosphate ester can generate a good synergistic effect with phosphoric acid, the stability of the positive electrode slurry is improved through other mechanisms besides the reduction of the pH value of the positive electrode slurry, and the improvement effect on the electrical performance of the battery is ensured. The phosphate and the phosphoric acid can improve the surface appearance and stripping force of a battery positive electrode prepared from the water-based positive electrode slurry, and effectively improve the coating loading capacity of the water-based positive electrode slurry, so that the mechanical property and the electrical property of the water-based slurry can be superior to those of oil-based slurry.

The application relates to the technical field of dental implants, in particular to a trans-zygomatic implant and a processing technology thereof, and the processing technology comprises variable-distance multi-stage sand blasting and acid etching surface treatment on an anchoring part with threads of the trans-zygomatic implant and electrochemical polishing surface treatment on an extension part without threads. The trans-zygomatic implant is treated by variable-distance multi-stage sand blasting combined with acid etching, so that a uniform micron-level rough base and a multi-stage micropore structure can be formed on the titanium surface, osteoblast adhesion and differentiation are facilitated, the early bone combination speed is accelerated, the combination strength is improved, the early implant loosening risk is reduced, the extension part of the trans-zygomatic implant is treated by electrochemical polishing, a smooth surface can be obtained, plaque adhesion and bacterial colonization are greatly reduced, the implant peri-implantitis risk is reduced, and soft tissue adhesion is promoted; the dual optimization of bone anchoring and tissue adhesion is realized, and the long-term function and health of the trans-zygomatic implant under complex stress are guaranteed.

The invention relates to a poly-L-lactic acid microsphere used for a drug delivery system and having a controllable degradation rate and a preparation method and application thereof.The preparation method comprises the steps that an oil-phase organic solution is added into an emulsifier aqueous solution through an SPG film to be stirred for a reaction, and a poly-L-lactic acid microsphere crude product is obtained; sequentially mixing and reacting the L-polylactic acid microsphere crude product with a sodium hydroxide solution and a polylysine solution, washing and freeze-drying to obtain L-polylactic acid microspheres; a solute in the oil-phase organic solution comprises poly-L-lactic acid and a lactic acid-glycolic acid-polyvinyl alcohol block copolymer. The poly-L-lactic acid microsphere material obtained through a specific preparation process has good stability and biocompatibility, is controllable in degradation rate, and is suitable for preparing a drug delivery system, so that the drug curative effect is improved, and the drug administration frequency is reduced.

This invention discloses an ultrasonic vibration-assisted full-domain transient cladding device and method in the field of surface strengthening technology for components. The cladding chamber is equipped with an inert gas cylinder, an ultrasonic generator, and a vacuum pump on its exterior. Inside the cladding chamber, from top to bottom, are arranged an ultrasonic vibrating head, a perforated graphite felt, coating powder, a workpiece, and a third telescopic motor. The top surface of the workpiece is covered with a layer of coating powder. The perforated graphite felt has through-holes, and an ultrasonic vibrating head extends into one of the holes in the perforated graphite felt. Using air as a carrier, ultrasonic vibration is transmitted to the cladding layer. The workpiece itself does not vibrate, allowing the metal dendrites in the cladding layer to fracture during metal crystallization, promoting the growth of new crystal nuclei and achieving grain refinement. After the cladding layer is formed, the DC power supply is turned off, but the ultrasonic vibrating head continues to operate. The cladding layer of the workpiece impacts the ultrasonic vibrating head, forging the cladding layer and further improving its plasticity and mechanical properties.

The invention discloses a small special numerical control thread grinding machine, belongs to the grinding machine technology, and aims to solve the problems that the existing thread grinding machine grinds a single grinding wheel every time, is low in efficiency and is not suitable for large-batch small screw machining. The first grinding wheel and the second grinding wheel are arranged on the two radial sides of the part, and the first grinding wheel and the second grinding wheel can conduct rough grinding and fine grinding at the same time; the axial leads of the grinding dressing wheel, the part and the power head for driving the part to rotate are parallel and are arranged on a longitudinal carriage between the first grinding wheel and the second grinding wheel, and the longitudinal carriage can drive the part, the dressing wheel and the like to axially move back and forth; the first grinding wheel and the second grinding wheel are arranged on the first transverse carriage and the second transverse carriage respectively and can transversely move left and right on the two radial sides of the part. Through numerical control grinding linkage and finishing linkage of the machine tool, precise grinding and efficient grinding of the small screw are achieved.

The application provides an inconel alloy plate and a surface control method thereof. The surface control method of the inconel alloy plate comprises the following steps: a thinning step, which comprises rolling the incoming material by at least two passes using a first work roll and rolling oil with a first kinematic viscosity, so as to obtain a thinned plate; in the rolling process, the rolling oil between the first work roll and the incoming material forms an oil film with a first thickness; a smoothing step, which comprises rolling the thinned plate by at least one pass using a second work roll and rolling oil with a second kinematic viscosity; in the rolling process, the rolling oil between the second work roll and the thinned plate forms an oil film with a second thickness; the oil film with the second thickness extrudes the surface of the thinned plate to form a plurality of oil pits, so as to obtain the inconel alloy plate. The oil pits obtained by extrusion of the oil film have a small planar area and a shallow depth, and the AOI defect detection rate in the subsequent precise metal mask manufacturing process can be reduced.

The invention belongs to the technical field of electro-catalysis, and particularly relates to a method for synthesizing an acetamido aromatic compound through electro-reduction of nitryl and application of the acetamido aromatic compound. According to the invention, a transition metal electro-catalytic material is firstly prepared, and the material is used as a cathode material for preparing the acetamido aromatic compound through electro-catalytic reduction. The preparation method comprises the following steps: putting a nitro compound, an anhydride compound and an electrolyte into an aqueous solution, reducing the aromatic nitro compound at a cathode, and coupling acetylation reaction to prepare the acetamido aromatic compound. The method comprises the following steps: by taking water as a hydrogen source, reducing a nitro compound through an electro-catalytic hydrogenation reaction, and combining with an acetylation reaction to obtain an acetamido aromatic compound; the method has the advantages of high reaction chemical selectivity, high yield, strong universality, simple operation, mild reaction conditions, low energy consumption and easy product separation. Meanwhile, the electrocatalyst material is simple to prepare, low in cost, recyclable and capable of being prepared on a large scale, and has a wide industrial application prospect in the fields of industrial electrocatalytic organic synthesis and new energy.

The invention discloses a high-performance hollow fiber membrane which is prepared by the following steps: firstly preparing a spinning solution, preparing a primary membrane of a polyether sulfone / polysulfone hollow fiber membrane by adopting wet spinning, and then performing post-treatment for 30 seconds to 5 minutes at the relative humidity of 10 to 70 percent and the temperature of 160 to 250 DEG C, so as to obtain the high-performance hollow fiber membrane. By adjusting the relative humidity during annealing, the damp-heat synergistic effect is achieved, stress generated in the phase change process can be quickly released, hot steam can conveniently and completely intrude into pores of a membrane, the interior of fiber is treated, and the mechanical strength is improved; meanwhile, a polymer chain is helped to reach the position with the minimum Gibbs free energy through rearrangement, smoothness of the inner surface, the outer surface and the pore surface of the membrane is facilitated, adsorption of platelets and the like on the surface of the fiber membrane is further reduced, the blood coagulation effect is improved, and the blood compatibility is improved.

The invention relates to a preparation method of high-volume shield silt concrete, which comprises the following steps: preparing raw materials of the concrete, the raw materials of the concrete comprise 203-233 kg / m cement, 156-166 kg / m admixture, 1730-1766 kg / m aggregate, 165-180 kg / m water and 5.5-6.3 kg / m admixture, the sand rate of the aggregate is 42-45%, and the replacement rate of shield silt in the aggregate to machine-made sand is 14-17%; and mixing to obtain the C35 concrete. The shield silt is adopted to replace part of machine-made sand, the limitation of a traditional C35 concrete preparation method on use of high-mixing-amount silt is solved, and the method has the advantages that the mechanical property and the working performance of concrete are improved, and meanwhile efficient utilization of silt resources is achieved.

The invention discloses a hafnium oxide magnetron sputtering film with a high damage threshold for high repetition frequency femtosecond laser. The invention discloses a preparation method of the hafnium oxide magnetron sputtering film with the high damage threshold for the high repetition frequency femtosecond laser. The preparation process comprises the following steps: 1, by taking fused quartz as a substrate, etching the fused quartz in a hydrofluoric acid buffer solution before coating, then immediately cleaning the substrate with acetone, ethanol and deionized water, and finally drying in a drying box; and 2, performing sputtering coating on the high-purity hafnium target material by adopting a radio frequency magnetron sputtering coating system, and regulating and controlling sputtering power and an oxygen / argon gas flow ratio in the sputtering process to obtain the hafnium dioxide film deposited on the fused quartz substrate. And 3, putting the film into an annealing furnace for high-temperature annealing to obtain the final hafnium dioxide film. The optical performance of the hafnium dioxide thin film is remarkably improved by combining pretreatment of the substrate, regulation and control of deposition parameters and treatment after annealing, and the hafnium dioxide thin film shows good transmissivity in an ultraviolet visible region and a high damage threshold value under high-repetition-frequency femtosecond laser irradiation and can be applied to the field of high-repetition-frequency femtosecond lasers.