72results about How to "Uniform and dense surface" patented technology

The invention relates to the field of field emission electronic materials, in particular to a preparation method of a graphene thin film field emission material. The method comprises the following steps of: (1) uniformly dispersing graphene and metal cation inorganic salt capable of providing charges into an low polar organic solvent or directly dispersing the graphene into an aqueous solution of an ionic surfactant by adopting an ultrasonic method to prepare a stable graphene solution with charges; and (2) orderly depositing the graphene with the charges on a conductive substrate under the action of an external electric field by utilizing an electrophoretic deposition method to prepare a graphene film. The field emission material of the invention is an even and compact graphene film rich in graphene sheets perpendicularly to the plane. The method has the advantages of simple operation, low cost and good controllability and is suitable for preparing large-area graphene films, and the excellent field emission characteristics of the graphene film lay the foundation for applying the graphene film as a cold cathode material to high-performance field emission displays, and the like.

The invention discloses a preparation method of a self-assembled folded rGO composite membrane used for dehydration of organic matter and belongs to the field of membrane separation. The method comprises steps as follows: GO (graphene oxide) is sucked to a pretreated porous base membrane with rich amino, then, the base membrane is put in a preheated organic solvent to be modified and put in a glutaraldehyde water solution to be crosslinked, then, a polyelectrolyte is sucked to the surface of the modified GO composite membrane, and finally, the modified GO composite membrane is put in a water solution of a crosslinking agent to be crosslinked. The preparation process is simple, the film forming time is short, the composite membrane is applied to the field of pervaporation, the problems thatthe GO composite membrane has small flux and low separation factor in the pervaporation process are solved, and the composite membrane has uniform and compact surface and can be widely applied to thefield of water treatment.

The present invention discloses a method for ultrasonic electroplating of an aluminum alloy. The method sequentially comprises the following steps: a pre-plating treatment, one time zinc deposition, ultrasonic electroplating of nickel, ultrasonic electroplating of acid copper, ultrasonic electroplating of tin, and a post-plating treatment. With the method, after a tin layer is electroplated on an aluminum alloy, the obtained tin layer has advantages of compact and uniform surface, fine crystal, silver white color, bright mirror surface, oxidation resistance, corrosion resistance and strong weldability.

This invention discloses a technique for forming a color oxide film on the surface of aluminum and aluminum alloy products. The technique comprises: oxidizing aluminum or aluminum alloy in an aqueous solution of sodium silicate 2-10 g/L, sodium hydroxide 0.5-3 g/L, sodium molybdate 0.2-4 g/L, sodium silicofluoride 0.1-9 g/L, sodium tungstate 0.2-10 g/L, and potassium permanganate 0.5-4 g/L at 10-50 deg.C and current density of 0.08-2 A/cm2 for 0.5-3 h to obtain a yellow/brown/black oxide film. The oxide film is uniform and compact, and has a thickness of 20-200 mum. Besides, the oxide film also has good wear and corrosion resistance. The technique has such advantages as simple process, and no pollution.

The invention discloses a hollow-pipe micro-lattice ceramic material constructed by adopting a template method and a preparation method thereof. The method comprises the steps: preparing a three-dimensional micro-lattice polymer template of a designed structure by adopting a rapid forming technology; depositing ceramics on the surface of the micro-lattice polymer template so as to prepare a preformed body; removing a template, thereby obtaining the hollow-pipe micro-lattice ceramic material. According to the hollow-pipe micro-lattice ceramic material constructed by adopting the template method and the preparation method thereof, the template method and a thin-film deposition method are organically combined, and the prepared lightweight and porous hollow-pipe micro-lattice ceramic material has the characteristic of low density and the properties of high strength, high modulus, high hardness, high-temperature resistance, corrosion resistance, radiation resistance, small thermal expansion coefficient and the like and is a multifunctional, lightweight and porous micro-lattice material. The hollow-pipe micro-lattice ceramic material is applied to the fields of aviation, aerospace, electronic information and the like.

The invention relates to a ferro-electricity film capacitor of ferro-electricity and relative preparation, wherein said film capacitor is formed by silicon substrate, silica dioxide baffle layer, titania adhesive layer, low electrode metal layer, low buffer layer, ferro-electricity film layer, up buffer layer, and up electrode metal layer; the adhesive layer is 10-30nm thick; the low electrode metal layer is 100nm-300nm; the low buffer layer is 5-20nm thick; the ferro-electricity is 200-500nm thick; the up buffer layer is 100-200nm thick; the up electrode metal layer is 80-150nm thick. The inventive capacitor has low fatigue speed, low drain current. The invention uses magnetic control splash method to layer-to-layer splash production, while the product has better property, with single direction.

The invention provides a preparation method of a silicon chip used for a planar solid discharge tube chip manufacturing process. The method comprises the following steps: carrying out acid corrosion on a silicon chip to remove silicon and obtaining a silicon chip with a certain thickness; carrying out alkali etch on the silicon chip whose thickness becomes thinner until a surface of the silicon chip becomes compact and uniform; carrying out second acid corrosion on the silicon chip with a compact and uniform surface to obtain a silicon chip which meets a thickness requirement and has a compact and uniform surface. According to the invention, a principle that the acid corrosion can rapidly remove silicon and the alkali etch can obtain a compact and uniform surface is utilized, a corrosion mode is employed to process the silicon chip to obtain the silicon chip which meets the thickness requirement and has the compact and uniform surface; a corrosion process flow has the advantages of a simple process, a simple operation, small energy consumption, good silicon chip consistency, a large surface metal Ohm connecting area and a low chip broken rate.

The invention provides an ITO/Nb composite modified polymer electrolyte membrane fuel cell metal bipolar plate. A 2-6[mu]m ITO/Nb composite modification layer is on the surface of the metal bipolar plate, wherein the corrosion speed is lower than 10[mu]A/cm<2>, and contact resistance is lower than 10m<omega>.cm<2>. Under the premise of ensuring sufficient strength, a magnetron sputtering method is adopted by the preparation method disclosed by the invention, so that the corrosion resistance and surface electrical conductivity of the metal bipolar plate can be improved synchronously, and the performance of the polymer electrolyte membrane fuel cell is improved; and the preparation method has the advantages of mature process, continuous production, and excellent surface quality of the modification layer, so that large-scale batch production of the bipolar plate can be realized.

The invention provides a Ni-P electroless plating solution and a preparation method for a Ni-P nano cubic boron nitride composite coating. Potassium iodide serves as a single stabilizer for a conventional Ni-P electroless plating solution, so that the stability of the conventional Ni-P electroless plating solution is limited in some cases. According to the Ni-P electroless plating solution, the stability of the Ni-P electroless plating solution is improved through a potassium iodide/ tin methanesulfonate compound stabilizer, and the harmful effect of tiny particles (such as nano particles) on the stability of the electroless plating solution in the electroless plating process is reduced. The Ni-P nano cubic boron nitride composite coating is prepared by using the Ni-P electroless plating solution. The composite coating prepared through the preparation method is compact, even, good in binding force, high in hardness and abrasion resistance, and has excellent corrosion resistance; the service life of workpieces is prolonged.

The invention discloses a material additive manufacturing method of a square hole pipeline aluminum alloy part. The material additive manufacturing method of the square hole pipeline aluminum alloy part includes: first, performing modeling and hierarchy slicing for the square hole pipeline aluminum alloy part, then feeding raw material into a 3D (three dimensional) printing device for melting, printing and shaping, and finally obtaining the square hole pipeline aluminum alloy part. The material additive manufacturing method of the square hole pipeline aluminum alloy part converts horizontal plane printing to oblique plane printing, achieves material additive manufacturing of the square hole pipeline aluminum alloy part on the premise of meeting accuracy of the inner wall of a square hole pipeline, obtains a uniform and compact surface for the square hole pipeline aluminum alloy part manufactured through simple scanning and chessboard scanning modes, avoids surface defects in machining,simplifies the manufacturing process, shortens a manufacturing period, achieves one-time integral shaping for the square hole pipeline aluminum alloy part, and greatly improves production efficiency.

The invention discloses an ultraviolet light assistant preparation method for a ferroelectric film for a ferroelectric memory, and belongs to the field of microelectronic information functional materials and devices. The concentration of PZT precursor solution for the ferroelectric memory is 0.1-0.3 mo1/1. The method comprises: after glue evening of each rotation, a film is baked and radiated by even ultraviolet light, the intensity of illumination is between 10 and 15 mW/cm<2>; then the film is subjected to pyrolysis treatment; and finally the PZT film is subjected to annealed treatment at a temperature of between 550 and 600 DEG C. The PZT ferroelectric film for the ferroelectric memory is a polycrystalline film, has the characteristics of good ferroelectric performance, fatigue endurance and current leakage resistance, has the advantage of low crystallization temperature, and can be compatible with the prior Si semiconductor process.

The invention relates to a zinc-based antibacterial non-woven fabric and a preparation method thereof. The zinc-based antibacterial non-woven fabric is prepared by preparing a zinc-based nano-antibacterial dispersion liquid, mixing the zinc-based nano-antibacterial dispersion liquid with a dispersant and a synergist, carrying out dipping treatment on a polypropylene fiber non-woven fabric, and drying the polypropylene fiber non-woven fabric. The zinc-based antibacterial non-woven fabric is green, environment-friendly, non-toxic, non-irritating, short in antibacterial action time and lasting inantibacterial effect, and has excellent properties of good stability, no decomposition when meeting light and heat and the like.

The invention discloses a method for preparing an electrode material by graphene oxide and poly 3, 4-ethylenedioxythiophene. The method comprises the following steps of (1) immersing carbon felt in ahydrogen peroxide solution, performing constant-temperature reaction under 90 DEG C, washing the carbon felt with deionized water, and drying the carbon felt; (2) mixing a graphene oxide solution, 3,4-ethylenedioxythiophene solution and an electrolyte sodium sulfate solution, performing ultrasonic reaction to obtain an electrolyte suspension liquid, immersing the carbon felt in the electrolyte suspension liquid, performing immersion for 30 minutes under a room temperature, performing immersing for 2-3 hours under 40 DEG C, and performing electrodeposition; and (3) performing microwave reaction on the carbon felt for 5 minutes, and performing drying. The electrode material prepared by the method is compact and uniform in surface, the electrode is high in specific area and conductivity, lowin impedance and high in electron transfer efficiency, and has favorable biocompatibility, namely power generation performance.

The invention relates to a method for preparing a SiC (silicon carbide) coating with fine grains on the surface of a C/C (carbon/carbon) composite. The C/C composite which is polished, washed and dried is subjected to atomic oxygen oxidation treatment, the surface of the C/C composite subjected to atomic oxygen oxidation treatment is fluffy, the fluffy surface can provide a large quantity of nucleation points, nucleation of the SiC coating is facilitated, and a more uniform and compact coating can be formed on the surface of the C/C composite. The SiC coating is prepared on the surface of the C/C composite subjected to atomic oxygen oxidation treatment in a vacuum furnace under the protection of argon with an embedding method, the size of the grains of the prepared SiC coating ranges from 1 mu m to 5 mu m, and the size of grains of a SiC coating prepared with a traditional embedding method is about 20-100 mu m. After a sample which is not subjected to atomic oxygen oxidation treatment is oxidized, a large quantity of pores and cracks occur on the surface and the size of the pores is about 20-500 mu m; however, after a sample subjected to atomic oxygen oxidation treatment is oxidized, a few pores are formed in the surface, the size of the pores is about 20-110 mu m, and the glassy state formed on the surface is relatively continuous and can effectively protect the C/C composite.

The invention relates to the technical field of biomedical shape memory composite materials, in particular to an Nb coated NiTi shape memory composite material and a preparation method thereof. According to the method, the prepared composite material has good biocompatibility, high stress-induced martensite phase transformation critical stress and large recoverable dependent variable, the problemthat an existing single biomedical shape memory alloy, such as a NiTi-based alloy and a no-Ni beta titanium alloy, cannot has the good biocompatibility, high stress-induced martensite phase transformation critical stress and large recoverable dependent variable at the same time can be solved, and the composite material can be applied to the field of biomedicine.

The invention relates to the technical field of surface treatment, in particular to a composition for the surface treatment on aluminum flexible connection. Each 1L composition is prepared from 190-215g of nickel sulfate, 32-46g of chlorate, 30-48g of boric acid, 5-15g of a complexing agent and 1-2g of an addition agent. According to the composition for the surface treatment on the aluminum flexible connection, the nickel sulfate, the chlorate, the boric acid, the complexing agent, the addition agent and a wetting agent are adopted to jointly prepare the composition for the surface treatment on the aluminum flexible connection, a better synergistic effect is achieved among the nickel sulfate, the chlorate, the boric acid, the complexing agent, the addition agent and the wetting agent, theprepared composition has the better surface treatment effect on the aluminum flexible connection, the surface is dense and homogeneous, and brightness is higher; and phenomena such as graying and darkening cannot appear on the surface of the aluminum flexible connection after the composition is placed for a period of time. In addition, the binding strength of surface cladding and the aluminum flexible connection is higher, the aluminum flexible connection is repeatedly bent to breakage, and phenomena such as peeling and falling off cannot appear to the surface of the aluminum flexible connection.