314results about How to "Composition controllable" patented technology

The invention relates to a carbon/copper/metal oxide composite porous material and a preparation method and application thereof. The composite porous material is of a composite structure consisting of carbon, metal copper nano particles and metal oxide nano particles; in the composite structure, the metal oxide nano particles are stacked to form a three-dimensional porous skeleton; the metal copper nano particles are attached to the metal oxide nano particles; and the carbon wraps the surfaces of the metal copper nano particles and the metal oxide nano particles. The invention also provides a preparation method and application of the composite porous material. According to the carbon/copper/metal oxide composite porous material and a preparation method and application thereof provided by the invention, the reaction conditions are mild, the preparation process is simple and easy to implement and environment-friendly, the components are controllable, the output is high, and large-scale production is easy to realize; and due to the addition of the carbon and copper nano component, the prepared carbon/copper/metal oxide composite porous material obviously improves the electrical conductivity and is favorable for the functionalization application of the metal oxide nano material.

The invention relates to a nanocrystal metal oxide composite electrode and a method for preparing the same. The electrode is suitable for a seawater electrolysis device for preventing the contamination of sea creature and used for electrolytic production of sodium hypochlorite, cathode protection and other electrochemical engineering; a main structure of the electrode comprises a substrate, an anticorrosive antipassivated middle layer and a surface activity layer, wherein the substrate is metal titanium; the purity of the metal titanium is over 99 percent; the middle layer is iridium-tantalum or iridium-tantalum-tin oxide; the surface activity layer is ruthenium-iridium-tin metal oxide; a process for preparing the electrode adopts a sol-gel method and comprises three process steps of the pretreatment of the substrate, the preparation of the anticorrosive antipassivated middle layer and the preparation of the surface activity layer; and the electrode has the characteristics of even compositions, difficulty for burning loss, fine crystal grains, simple preparation process, controllable process and the like.

The invention provides an epigallo-catechin gallate (EGCG) with high purity and a preparation method thereof. The EGCG content is 98.0 percent to 99.9 percent. The preparation method mainly comprisesthe working procedures of extracting, separating by a chromatography and crystallizing. The invention has favorable reproducibility of preparation process, high acquired EGCG content, low cost and stable and controllable quality and is suitable for industrialized production.

The invention relates to a zirconium oxide thermal barrier coating for turbine buckets of a gas turbine and a preparation method thereof. The zirconium oxide thermal barrier coating for the turbine buckets of the gas turbine is characterized in that adhesive layer materials and ceramic layer materials are plated on a metal surface; the adhesive layer materials include the following materials in percentage by weight: 15-30% of Co, 20-30% of Cr, 6-16% of Al, 0.2-1.0% of Y, and the balance of Ni; and the ceramic layer materials are zirconium oxide (ZrO2/(5-8%)Y2O3) with stable yttrium oxide. The prepared zirconium oxide thermal barrier coating has compactness, good combining capacity with a base body and good thermal cycle resisting capacity and high temperature corrosion resisting capacity.

The invention relates to a method for preparing a load type high-dispersion multi-component precious metal nanoparticle catalyst. The method comprises the steps of 1) under inert atmosphere, uniformly stirring a solvent and a surface active agent, then adding a precious metal precursor solution, rising the temperature, reacting for a certain period of time, cooling to the room temperature, adding normal hexane, and performing extraction layering; 2) uniformly mixing the obtained upper layer nanoparticle solution with a carrier, and stirring or performing ultrasonic treatment; and 3) centrifugating, washing and drying or baking the mixed solution to obtain the catalyst. For the precious metal catalyst, even under a relatively high carrying amount, relatively good precious metal nanoparticle dispersion degree can be still guaranteed; the particle sizes of the particles are uniformly distributed; the precious metal carrying amount is controlled easily and accurately; the particle sizes and the components of multi-component particles can be controlled; and the catalysis application range is wide. The process is simple; the preparation cost is low; the applicability is high; and load-type high-dispersion precious metal and the multi-component precious metal nanoparticle catalyst can be prepared in a large scale.

The invention relates to a method for preparing a high-dispersion precious metal and alloy nanoparticles thereof, which comprises: 1) uniformly stirring glycol and specific surfactant in a certain proportion in an inert atmosphere to prepare milky emulsion; 2) adding solution of precursor of the precious metal into the mixed solution, heating the resulting solution to a given temperature, keeping the temperature for a certain time period with stirring, cooling to room temperature, adding nonpolar solution and extracting; and 3) performing the rotary evaporation of upper solution to remove solvent, washing with ethanol or mixed solution of ethanol and normal hexane, centrifuging and obtaining the high-dispersion precious metal and the alloy nanoparticles thereof. The nanoparticles prepared by the method have uniform particle size and high monodispersity, and can be separated easily; the alloy is controllable in particle size and composition; the process is simple; the preparation cost is low; the solvent system is cheap; and the method is widely applicable and can realize large-scale preparation easily.

The invention discloses a method for preparing lithium iron phosphate serving as a positive active material of a lithium battery, and relates to a method for preparing lithium iron phosphate serving as a positive active material of a high-power lithium ion secondary battery by adopting a sol self-propagation method. The method is characterized by comprising the following preparation processes: manufacturing sol by using soluble iron salt, lithium salt, phosphoric acid, complexing agent and doped metal source and carbon source precursors as raw materials, concentrating the sol, and then initiating self-propagation combustion at the temperature of between 650 and 750 DEG C to synthesize olivine-type pure lithium iron phosphate, doped lithium iron phosphate or composite powder of carbon and one of the olivine-type pure lithium iron phosphate and the doped lithium iron phosphate. By using the method of the invention, the self-propagation combustion is directly initiated at the background temperature of between 650 and 750 DEG C in the non-oxidizing atmosphere without a gel process, so high-performance lithium iron phosphate powder with controllable components, uniformity and fine grains in 3 to 60 minutes can be obtained, wherein the lithium iron phosphate powder can be used as the high-quality positive material of the secondary lithium battery. The method can be used for batch production.

The porous silicon nitride ceramic is prepared with C and CO2 in 75-95 wt%, silicon nitride 1-10 wt%, and sintering assistant 2-20 wt%. The C/CO2 weight ratio is 0.4-0.6; and the sintering assistant is at least one the metal oxides Y2O3, Al2O3 and MgO. The preparation process includes the following steps: ball milling the materials, drying and sieving to obtain mixture powder; pressure forming in mold; and sintering in a nitrogen atmosphere furnace through raising temperature at the rate of 600deg.c/hr to 1500deg.c, further raising temperature at the rate of 180deg.c/hr to 1700-1800deg.c, and maintaining at nitrogen pressure of 6-10 atm for 2-8 hr to obtain the sintered body. The porous silicon nitride ceramic may be used as base filter material for separating gas in high temperature and corrosive atmosphere, heat resisting material and reinforcing material in gas turbine, engine, space shuttle, etc.

The invention belongs to the novel cement material field and specifically relates to the preparation of a single-component alkali-activated cement and an application method thereof, wherein a raw material 1 including SiO2, Al2O3, and CaO are mixed with the raw material 2 including Na2O in a certain ratio; the ratio should be decided so that the percentage of the weight of each component of the calcined product, which is obtained by calcining the mixed materials at a temperature greater than or equal to 1100 DEG C, in the total weight is as follows: Al2O3: 8-25%; SiO2: 24-55%; CaO: 10-55%; and Na2O +0.658K2O: 6-25%; after being calcined at a temperature ranging from 950-1200 DEG C for 1.5-3 h, the mixed materials are then ground to obtain cement powder; the cement powder is mixed with water into paste; next, the paste is cured at 50-80 DEG C for 2-3 days so that neat cement paste briquettes excellent in strength can be obtained; and the strength can be continuously increased if curing is continuously performed under normal temperature. The preparation of the single-component alkali-activated cement has the following advantages that: the raw material range of the alkali-activated cement is greatly expanded; the storage, transportation and utilization of the cement are more convenient; and the improvement of the cementitious activity of the cement and the reduction of the cost are expected to be realized.

The invention relates to an Nb-doped nano indium tin oxide powder and a method for preparing high density sputtering coating target thereof. The method comprising the following steps: (1) dissolving high pure metals: high pure metal niobium, high pure metal indium and high pure metal tin are respectively dissolved into transparent solutions by inorganic acid; (2) mixing: the obtained transparent solutions are respectively filled into containers according to the proportion; (3) chemical precipitation: the three transparent solutions are made into Nb-doped and heavily tin-doped indium hydroxide nano-powder; (4) washing: the Nb-doped and heavily tin-doped tin indium hydroxide nano-powder is washed by de-ionized water and then precipitated; (5) calcinating: the nano-powder is calcined, and the Nb-doped nano indium tin oxide powder is prepared; (6) granulation: the Nb-doped nano indium tin oxide powder is added with a bonding agent and then dried, so that Nb-doped nano indium tin oxide powder before molding can be prepared; (7) molding: the Nb-doped nano indium tin oxide powder before molding is pressed into early embryo; (8) sintering: the early embryo is sintered under the normal pressure, and the high density sputtering coating target of the Nb-doped indium tin oxide can be prepared; in addition, pressure sintering can be adopted to further improve the density of the target.

The embodiment of the invention discloses a silicon heterojunction solar cell with an electroplating electrode and a manufacturing method thereof. The method comprises the steps that a metal seed layer is formed on the surface, where a grid needs to be manufactured, of a cell substrate; a silk-screen printing ink process is used for forming an ink grid line groove pattern on the surface of the metal seed layer; after a preset time interval, the ink grid line groove pattern is cured; the ink grid line groove pattern is used as a mask film, an electroplating process is used for depositing a composite metal layer; the ink grid line groove pattern and the part, which is not in contact with the composite metal layer, of the metal seed layer is removed. The implementation mode for forming the ink grid line groove pattern by the silk-screen printing ink process is simple and controllable, moreover, ink can be removed easily, and the manufacturing technology is simple. In the curing process, the ink can be evenly expanded and deformed, the width of an opening of the obtained ink grid line groove pattern is small, the depth-width ratio of a formed metal grid line is large, the light shading area is small, and the efficiency of the silicon heterojunction solar cell with the electroplating electrode is improved.

The continuous magnetically controlled sputtering and physically vapor depositing process of preparing Fe-6.5 wt%Si sheet includes the first sputtering with monocrystalline or polycrystalline silicon as the cathode target and low silicon steel strap as the anode to deposit silicon substance on single or double sides of the steel strap, and the subsequent high temperature inward diffusing of silicon atoms until reaching the total silicon content of 6.5 wt % and obtaining high silicon steel strap with excellent soft magnetic performance. The present invention has high work efficiency, easy control of the technological parameters and high product quality, and is suitable for industrial application.

The invention relates to a method and a device for preparing a film coating micronano texture and belongs to a film coating of surface engineering. The preparation method comprises the steps of preparing at early stage, depositing the film coating, preparing the micronano texture and performing aftertreatment. The special device is a multi-beam pulse laser micronano texture processing system device. The multi-beam pulse laser micronano texture processing system device comprises a pulse laser module, an optical path transmission module and a precise scanning module which are connected with one another sequentially. The invention has the advantages that: the method and the device are convenient in processing and high in efficiency; preparation for the film coating deposition micronano texture on the surface of a material is realized by one laser source; the process is simple, and easy to control; the prepared samples are not subjected to a complex posttreatment process; the application range is wide; ultraviolet pulse laser has the characteristics of large photon energy and short wavelength and can perform precise micronano texture treatment on any materials; chemical reaction of various gases can be induced; and film coating deposition can be performed efficiently.

The invention discloses a garnet-structure lithium lanthanum tantalate-based solid electrolyte material and a preparation method thereof. The lithium lanthanum tantalate-based solid electrolyte material is a compound of Li5La3Ta2O12 doped at the lanthanum site and/or tantalum site; and the preparation method comprises the following steps: dissolving tantalum pentoxide in a H2C2O4 solution; adding lithium salt and lanthanum slat and the salt of a lanthanum site-doped compound and/or the salt of a tantalum site-doped compound, and mixing to obtain a solution; adding EDTA into the obtained mixed solution for reaction until transparent and clear sol appears; adding a water-soluble high-molecular polymer and continuously reacting until gel appears; drying the obtained gel and calcining; performing mould pressing of the calcined particles to obtain a blank; and further calcining the blank to obtain the solid electrolyte material. The preparation method is mild in conditions, simple in process and simple to operate, and can realize industrial production; the prepared solid electrolyte material has good electrochemical stability and relatively high electrical conductivity, and can be used for preparing an all-solid-state lithium ion battery.

The invention discloses an yttrium barium copper oxide superconducting thin film mixed with samarium. Chemical composition of the superconducting thin film is YSmxBa2-xCu3Oy, wherein 0

The invention discloses a preparation method of a tin oxide-graphene composite carbon film. The method comprises the steps of feeding ethylene glycol into graphene oxide water dispersion solution, evenly dispersing in an ultrasonic way, feeding a tin source and PVP, dissolving by stirring, and carrying out microwave heating; after reaction, cooling to the room temperature, carrying out suction filtration, washing by distilled water, and carrying out vacuum drying; and carrying out heat treatment to obtain the composite carbon film. In the reaction system, ethylene glycol is taken as not only a solvent but also a reducing agent, and the reduction products, namely oxalic acid and PVP, have the function of stabilizing the sizes of nano particles; a microwave way is used for heating, so that the temperature of the system is increased rapidly, and tin oxide particles with small sizes can be easily prepared; before the reaction, tin source ions are evenly absorbed on the surface of graphene oxide, so that the tin oxide particles in the product can be evenly distributed, oxidation hydrolysis of the tin source and the reduction of graphene oxide can be realized synchronously, and the components can be controlled. The prepared material is stable in structure, and can be directly used as an electrode for assembling a lithium ion battery after being simply cut.