97results about How to "Low degree of reunion" patented technology

The invention relates to a method for preparing black zirconia ceramics at the low temperature and belongs to the technical field of the preparation of high-temperature structural material. The method respectively uses a homogeneous precipitation method for synthesizing a nanometer coloring agent, and a coprecipitation method for synthesizing nanometer zirconia powder, and adopts Fe-Co-Ni-Mn as a coloring agent. The zirconia powder is not added with any sintering additive, only added with small amount of coloring agent and sintered at the temperature of 1150-1350 DEG C, thus obtaining the black zirconia ceramics with excellent performance and bright color. As the homogeneous precipitation method is adopted for synthesizing coloring agent powder, the monodisperse nanometer particles with uniform powder granules, narrow size distribution and high purity are obtained so that the coloring agent easily colors the particles. As the coprecipitation method is used for synthesizing zirconia powder, nanometer particles with small granularity, big superficial area and high activity are obtained, and can reduce the temperature of the solid-phase reaction, greatly reduce the sintering temperature and solve the problem that the black coloring agent oxide decomposes and volatiles at the high temperature. Simultaneously the method adopts the Fe-Co-Ni-Mn as the coloring agent, thus avoiding the poisonous function of Cr on the human body.

The invention provides a preparation method of tungsten carbide nanopowder. The preparation method comprises the following steps of: preparing a tungsten-carbon precursor by using soluble tungsten salt and organic acid as raw materials through a sol-gel method, and then carrying out heat treatment on the tungsten-carbon precursor to obtain the tungsten carbide nanopowder. The preparation method provided by the invention is simple and practical, avoids the multistep control mode of the traditional preparation methods, saves energy, and is suitable for industrial production; and the tungsten carbide nanopowder prepared by the invention has the advantages of uniform and small particle size (smaller than 50 nm), low aggregation degree, low impurity content and low residual carbon content (lower than 0.5wt%).

The invention discloses a method for preparing a ZrO2-CeO2/CNTs composite nanotube by a hydrothermal method, which is a method for preparing a composite carbon nano tube based on nanoscale cerium oxide, nanoscale zirconia and a carbon nano tube. The preparation method comprises the steps of: sequentially adding the carbon nano tube, a surface active agent, zirconium oxychloride, cerous nitrate and deionized water which serve as raw materials according to stoichiometric ratio; performing ultrasonic dispersion to uniformly mix the raw materials; dripping ammonia water into the mixed raw materials until the pH value is 9.5; and performing hydro-thermal treatment to prepare a product, wherein the tube diameter of the prepared ZrO2-CeO2/CNTs composite nanotube is between 50 and 80 nanometers, and a specific surface area reaches 70-150 m<2>/g; and the ZrO2-CeO2/CNTs composite nanotube exists in the form of complete solid solution of a square/cubic system, the crystallinity reaches over 75 percent, and the ZrO2-CeO2/CNTs composite nanotube is uniform in loading and has no agglomeration phenomenon. The method has the advantages of simple process, no need of high-temperature calcination, low energy consumption and the like.

The present invention provides a metallic composition, which contains a plurality of ultra-fine metallic particles (e.g., ultra-fine copper, nickel, or silver particles) having at least one desirable feature, such as, tight size distribution, low degree of agglomeration, and high degree of crystallinity and oxidation resistance. The present invention further provides a method for forming the ultra-fine metallic particles. Also provided are a substance or substrate coated with the ultra-fine metallic particles and a method of coating a substance or substrate with the ultra-fine metallic particles. Furthermore, the present invention provides a method of controlling the size of ultra-fine metal particles formed in a reducing reaction in a liquid. Also provided is a method for producing ultra-fine metallic particles, which utilizes a concentrated reaction system.

The invention discloses a preparation method of dispersant modified iron nanoparticles. According to the preparation method, high polymer, a cationic surfactant or anionic polymer electrolyte is used as a dispersant to perform surface modification on particles in a preparation process of the iron nanoparticles so as to prepare the dispersant modified iron nanoparticles. The iron nanoparticles prepared by the method have good dispersion stability; the hard agglomeration of the iron nanoparticles in an aqueous medium is reduced; the dispersion degree of the iron nanoparticles is increased; the method can also be used for performing dispersion modification on iron base bimetallic particles; and the method can be applied to pollution remediation of chlorinated organic compounds in an environmental medium and has broad application prospect.

The invention relates to a production method and device of fine-grained low-chloride rare earth carbonate. The production method is mainly characterized in that rare earth chloride and a carbonate solution are added in a concurrent flow feeding way on a designed special precipitation reaction device, the spatial separation of a reaction zone and a crystallization zone is realized by controlling the feeding speed and discharging speed and controlling the aging time of rare earth carbonate, and thus the double purposes of directly obtaining a fine-grained low-chloride rare earth carbonate product from a hydrochloric acid medium by precipitation and realizing continuous production are achieved. By adopting the production method and device provided by the invention, the fine-grained rare earth carbonate product with the chloride content of less than 50ppm can be directly obtained from the hydrochloric acid medium by using cheap ammonium bicarbonate, the precipitation reaction device has a simple structure, and the continuous production can be realized.

The present invention provides a metallic composition, which contains a plurality of ultra-fine metallic particles (e.g., ultra-fine copper, nickel, or silver particles) having at least one desirable feature, such as, tight size distribution, low degree of agglomeration, and high degree of crystallinity and oxidation resistance. The present invention further provides a method for forming the ultra-fine metallic particles. Also provided are a substance or substrate coated with the ultra-fine metallic particles and a method of coating a substance or substrate with the ultra-fine metallic particles. Furthermore, the present invention provides a method of controlling the size of ultra-fine metal particles formed in a reducing reaction in a liquid. Also provided is a method for producing ultra-fine metallic particles, which utilizes a concentrated reaction system.

This invention discloses one step hydrothermal method synthesizing nucleocapsid style TiO2/Al2O3 nm powder body preparation method. It includes following procedures first ammonia water is added into material TiC14 solution to control pH value between 8.5 and 9.0 to fully deposit Ti4+ in the solution to make predecessor Ti(OH)4 of Ti02, then AlCl3 solution is added to Ti(OH)4, and ammonia water is added to Ti(OH)4 at the same time, pH value is adjusted to 8.8-9.5, then Al(OH)3 envelope is formed on surface of Ti(OH)4 to get predecessor. The predecessor is filled into high pressure tank as Ti(OH)4/Al(OH)3 style to take part in hydrothermal reaction, then it is filtrated after the reaction, and then it is alcohol water exchanged by absolute ethyl alcohol, finally TiO2/Al2O3 nm powder body is got after dried. There is no need to prepare nm level Ti02 core, and then enveloping in this method. Because water heat method is used in this invention, complex powder particles are uniform, envelope is integrated, agglomeration is few, and its preparation cost is reduced, technological line is facilitated, so it has wide industrial application prospect.

The invention discloses a preparation method of a submicron transition metal boride powder with low oxygen content. The method comprises the following steps: first carrying out ball milling mixing and drying on a transition metal oxide and elementary substance boron to obtain a MO2 / B mixed powder carrying out heat treatment on the MO2 / B mixed powder to obtain a MB2 / B2O3 powder; adding the obtained MB2 / B2O3 powder into water, heating and stirring to dissolve out B2O3 therein and centrifuging to obtain a MB2 powder; carrying out heat treatment on the obtained MB2 powder again. Compared with a prior art, the transition metal boride powder prepared by the method of the invention has advantages of a small particle size of 200-700 nm, low degree of aggregation and an oxygen content about 0.01-1.0wt%; besides the process of the preparation method of the present invention is simple and practical, has strong controllability and is easy for realization of large scale production.

The invention discloses a preparation method of a tin antimony oxide organic nano paste, which comprises the following steps: mixing ATO nano powder with an organic solvent, adding tetraethoxysilane for carrying out a heat preservation reaction, cooling, adding the organic solvent again and polyethylene imine, adjusting the pH value of the obtained mixture, and grinding the obtained product so as to obtain an ATO organic nano paste. The method disclosed by the invention is simple in process, low in energy consumption and low in cost; and due to the adoption of an efficient composite dispersant and a unique dispersion technology, a stable ATO organic nano paste can be prepared in a relatively short time.

The invention relates to a method for preparing ultra-high rare earth composite oxide ultraviolet screening agent, which is characterized by comprising the steps of: formulating raw materials, including salt solution of the rare earth and oxides of two elements in IIIB-IIB, into mixed solution with the rare earth ion concentration of 0.05mol/L to 2mol/L, wherein the rare earth salt in the mixed solution accounts for 40%-80% by mass percent, adding surface dispersant for dissolution, wherein the adding amount of the surface dispersant accounts for 0.1-3% of the mixed solution by mass percent, then adding precipitating agent with the concentration of 0.1mol/L to 4mol/L to react under vigorous stirring at 50 DEG C to 90 DEG C until pH value reaches 6.5 to 7, filtering and washing the reactant, drying the reactant for 6 to 24 hours at 70 DEG C to 110 DEG C, converting the dried reactant to precursor powder with the particle size lower than 2 microns, and heating the precursor powder to 900 DEG C in a gradient manner through 300 DEG C and then preserving heat for 30 to 180 minutes to obtain the ultra-high rare earth composite oxide ultraviolet screening agent with the particle size of 20 to 300nm. The method has the advantages of: low cost, excellent quality, high efficiency, great easiness for industrial production, strong screening within the ultraviolet range from 100nm to 400nm, high thermal and chemical stability, no toxicity, no odor and great solvent resistance.

The invention relates to a preparation method of a transparent rare earth composite oxide ultraviolet screener. The method is characterized in that the method comprises the following steps: processing raw materials comprising a rare earth salt solution and salts of tin and zinc to prepare a mixed solution having a rare earth ion concentration of 0.05-2mol/L and having a rare earth salt mass fraction of 40-80%, adding a dispersant for dissolving, adding a precipitating agent in a dropwise manner, reacting under stirring at 50-90DEG C until the pH value reaches 7-8, carrying out filtration washing, drying at 70-110DEG C for 6-24h for converting to precursor powder, heating the precursor powder to 900DEG C in a 300DEG C temperature gradient manner, and carrying out heat insulation for 30-180min to obtain the transparent rare earth composite oxide ultraviolet screener having an average particle size of below 500nm. The ultraviolet screener has the advantages of transparency, cheapness, high quality, easy industrialized production, strong shielding of ultraviolet ray in a wavelength range of 100-400nm, permeation of visible light in a wavelength range of 400-780nm, high heat stability, high chemical stability, non-toxicity, odorlessness and solvent resistance.

The invention belongs to the field of biomedical materials, and particularly relates to a La0.7Sr0.2Bi0.1MnO3 magnetic nanoparticle, a preparation method and an application of the magnetic nanoparticle. The sodium hyaluronate modified La0.7Sr0.2Bi0.1MnO3 magnetic nanoparticle serves as a magnetic thermal therapy medium, a magnetic fluid takes the La0.7Sr0.2Bi0.1MnO3 magnetic nanoparticle as a core, and the surface of the magnetic nanoparticle is modified by the sodium hyaluronate to form stable magnetic hydrosol. The magnetic thermal therapy medium has good biocompatibility and chemical stability and high magnetic heating performance, can effectively kill cancer cells and has a wide application prospect in magnetic thermal therapy and thermo-chemotherapy combination and anti-tumor diagnosis and treatment integration.

The invention discloses a high performance computer cable sheathing compound, which comprises raw materials with parts by weight: polypropylene 20-40 parts, polyvinyl chloride 30-50 parts, ethylene propylene terpolymer 20-40 parts, succinic acid peroxide 0.5-0.9 part, tert-butyl hydrogen phthalate 0.8-1.5 parts, sodium dichromate ammoniums 2-5 parts, accelerants DM 0.2-0.8 part, carbon fibers 26-34 parts, silica 20-50 parts, hard clays 30-50 parts, modified cotton short fibers 25-45 parts, anti-aging agents 1-2 parts, polyvinyl butyral 1.2-1.8 parts, stearic acids 1-3 parts, trioctyl phosphates 0.5-1.8 parts and aromatic hydrocarbon oil 1.2-2.3 parts. The high performance computer cable sheathing compound is excellent in flame retardant efficiency, and is extremely excellent in mechanical property.

The invention belongs to the technical field of superfine powders and discloses a superfine transition metal boride powder as well as a preparation method and the application thereof. The superfine transition metal boride powder is a MO2-Ta2O5-B mixed power obtained by ball-milling and mixing MO2, Ta2O5 and B and then drying; then the MO2-Ta2O5-B mixed power is subjected to first-step thermal insulation under an air pressure of less than 200 Pa or an inert atmosphere to obtain a M1-xTaxB2-B2O3 powder; the M1-xTaxB2-B2O3 powder is continuously heated up under an air pressure of less than 200 Paor an inert atmosphere and is subjected to second-step thermal insulation to prepare a M1-xTaxB2 powder, wherein M is equal to Zr or Hf, and x is 0.005-0.2. The powder is low in degree of aggregation, has good high temperature resistance and still does not grow at a high temperature above 1800 DEG C. The superfine transition metal boride powder as well as the preparation method and the application thereof disclosed by the invention have the benefits that the cost is significantly reduced, and the preparation process is simple and low in cost.

The present invention is to provide hollow particles with a low degree of agglomeration and having a high roundness, and a process for producing them.

Hollow particles comprising a silicon compound, having an average particle size of from 5 to 65 nm and an average roundness of at least 0.90, and having a shell comprising the silicon compound and having a thickness of from 1 to 20 nm. Further, a method for producing hollow particles, which comprises adding sulfuric acid to a liquid containing spherical organic polymer-silicon compound composite particles having a core comprising an organic polymer and a shell comprising a silicon compound in a medium containing at least 95 mass % of water, followed by heating to carbonize the organic polymer thereby to convert it to a carbide, and subjecting the carbide to decomposition using a liquid oxidizing agent other than sulfuric acid.

The invention provides a preparation method of a one-dimensional Euphorbia-milii-shaped WO3 microcrystal, which comprises the following steps: adding WCl6 into an isopropanol-distilled water mixed solvent, adding a polyoxyethylene-polyoxypropylene block copolymer into the solution to obtain a precursor solution, pouring the precursor solution into a hydrothermal kettle, and reacting while controlling the temperature at 80-240 DEG C under the pressure of 2-16 MPa for 4-36 hours, wherein the hydrothermal kettle is fixed in an homogeneous reaction instrument, and rotates around a fixed axis at the rate of 20-70 r/min in the insulating process; and taking out the product, washing and drying. The prepared one-dimensional Euphorbia-milii-shaped WO3 microcrystal has the advantages of high purity, favorable crystallinity, favorable dispersity, uniform size, uniform shape and obvious oriented growth.

Nano-oxide particles are surface-protected with a polyvinyl monomolecular film having a binding functional group. The surface-protected nano-oxide particles are produced through vinyl polymerization of a vinyl monomer having a binding functional group in a solution containing nano-oxide particles, the vinyl monomer having the binding functional group, and a dispersion medium. The dispersion medium is contained in the solution in an amount of 70 wt. % or more.

The invention discloses a method for industrially continuously preparing nano tungsten powder. The method comprises the steps that (1) zinc elementary substances and first tungsten trioxide are placedin a first reaction zone in a high temperature tube furnace at intervals, second tungsten trioxide is placed in a second reaction zone, the zinc elementary substances are volatilized and are in contact reaction with first tungsten trioxide, and a mixture of first zinc oxide and nano tungsten powder is obtained; (2) hydrogen is introduced into the high temperature tube furnace, first zinc oxide isconveniently reduced through hydrogen, zinc steam is volatilized, and a nano tungsten powder product is obtained; (3) volatilized zinc steam is in contact reaction with second tungsten trioxide, anda mixture of second zinc oxide and nano tungsten powder is obtained; (4) the nano tungsten powder product in the first reaction zone is taken out, the mixture of second zinc oxide and nano tungsten powder is moved into the first reaction zone, and third tungsten trioxide is placed in the second reaction zone; and (5) the steps (2), (3) and (4) are repeated and circularly operated. According to themethod, industrial continuous production of nano tungsten powder can be achieved.