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43results about How to "Improve micro-uniformity" patented technology

Thermal deformation rare-earth permanent magnet material and preparation method thereof

The invention relates to a preparation method of a thermal deformation rare-earth permanent magnet material. The method comprises the following steps of (1) providing main magnetic powder and low-melting-point alloy powder separately, wherein a chemical formula of the main magnetic powder is Re<x>Fe<100-x-y-z>M<y>B<z> according to the mass percent, the chemical formula of the low-melting-point alloy powder is ReCu<100-a>, Re is one or more of Nd, Pr, Dy, Tb, La and Ce and a is smaller than or equal to 90 and greater than or equal to 60; (2) mixing the main magnetic powder with the low-melting-point alloy powder evenly to obtain mixed magnetic powder, wherein the mass ratio of the low-melting-point alloy powder in the mixed magnetic powder is greater than 0 and smaller than or equal to 10%; (3) carrying out hydrogenation-disproportionation-dehydrogenation-recombination treatment on the mixed magnetic powder and diffusing a low-melting-point alloy in the treatment process to obtain HDDR magnetic powder; and (4) sequentially carrying out hot-press molding and deformation molding on the HDDR magnetic powder to obtain the thermal deformation rare-earth permanent magnet material. The invention further provides the thermal deformation rare-earth permanent magnet material.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Method for preparing high-compact ITO target material through two-step sintering

The invention discloses a method for preparing a high-compact ITO target material through two-step sintering. The method comprises the following steps: firstly manufacturing the raw material into a biscuit, keeping warm and degreasing under the air atmosphere, directly placing under the air atmosphere to warm to 800-1300 DEG C after the degreasing and keeping warm for 5-30 hours to perform the first step of pre-sintering; placing the pre-sintered green body on a sintering bearing plate, warming to 1500-1600 DEG C and keeping warm for 5-30 hours under the oxygen atmosphere so as to perform the second step of sintering; stopping introducing the oxygen 1-5 hours before finishing the sintering; and performing furnace cooling to obtain an ITO target sintering body. The pre-sintering is performed under the air atmosphere so that the sintering time of the oxygen atmosphere can be shortened, the production energy consumption is greatly lowered; the degreasing and the pre-sintering process are integrated so that the sintering total time is saved; the pre-sintering enables the particles in the green body to be further homogenized, the abnormal crystal grain growth is avoided, and the microscopic homogeneity of the target is improved, and the strength and the thermal shock resistance are improved; the prepared ITO target density reaches to 7.128g/cu.cm and more.
Owner:725TH RES INST OF CHINA SHIPBUILDING INDAL CORP

Planetary concrete mixer

The invention discloses a planetary concrete mixer, which comprises a lower barrel body and a plurality of helical ribbon mixing devices, wherein a middle barrel body is connected to the upper part of the lower barrel body; a planetary gear mechanism is arranged in the middle barrel body; a cover plate is arranged at the upper end of the middle barrel body; a mixing drive device is arranged on the cover plate; a mixing input shaft is rotationally connected in the middle of the cover plate; the planetary gear mechanism comprises planetary racks, sun wheels and a plurality of planetary wheels; the planetary racks are connected to the lower end of the mixing input shaft; the sun wheels are sleeved on the mixing input shaft; the upper ends of the sun wheels are connected with the middle barrel body; planetary wheel shafts are arranged on the planetary racks; the planetary wheels are mounted on the planetary wheel shafts; each helical ribbon mixing device comprises two mixing arms; mixing helical ribbons are connected on the inner side surfaces of the two mixing arms; the upper parts of the two mixing arms are connected through a connecting plate; the lower ends of the planetary wheel shafts are connected with the connecting plates; and a vibration mechanism is arranged in the lower barrel body. According to the planetary concrete mixer, the microcosmic uniformity of concrete can be effectively improved.
Owner:CHANGAN UNIV

Nano-ZnO varistor composite powder material and preparation method thereof

The invention relates to a nano-ZnO varistor composite powder material and a preparation method thereof. The material is composed of ZnO, Co2O3, Bi2O3, Sb2O3 and Y2O3. The preparation method adopts a chemical coprecipitation method and particularly comprises the following steps: adding ZnO, Bi2O3, Co2O3, Sb2O3 and Y2O3 in dilute hydrochloric acid serving as a solvent, dissolving to form a transparent solution in a constant-temperature water bath environment; dropwise adding an ammonia solution serving as a precipitant into the transparent solution at a constant speed; and precipitating, filtrating, washing, drying, grinding and calcinating, thus obtaining the nano-ZnO varistor composite powder material. The preparation of nano-ZnO composite powder with excellent performances is a key of manufacture of a high-performance varistor. The ZnO composite powder prepared by using the method disclosed by the invention has the advantages of small particle size, uniform modified oxide distribution and narrow particle size distribution; and the preparation method disclosed by the invention is simple, and precisely controllable in component, and products have the characteristics of good morphology consistency, excellent electrical properties and the like.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Method for preparing titanium oxide through reducing titanium-containing complexes at normal temperature

The invention discloses a method for preparing titanium oxide through reducing titanium-containing complexes at normal temperature. The method is characterized in that reduction reaction occurs in a normal temperature liquid phase; the potential safety hazards due to mixing of reducing agents and air are eliminated; the reduction is performed in the liquid phase, the microscopic uniformity is high; the firing temperature is low; the time is short. The method has the following principle and steps that titanium sulfate or titanium tetrachloride and ammonium hydroxide or sodium hydroxide take a reaction to obtain titanic acid; the titanic acid reacts with oxalic acid or citric acid to form an oxalate oxytitanate complex-ion or oxytitanate citrate complex-ion solution; next, reaction is performed with zinc powder; the complex ions are reduced into low-valent titanium complex ions; the pH value of the solution is regulated to 12 by ammonium hydroxide; precipitates of dark brown color to dark violet color are generated; washing is performed for 3 to 5 times by 3 to 5 times of deionized water; the zin is washed away in an ion ZnO2<2-> form to obtain pure titanium hydroxide precipitates; oxalic acid is added until the pH is 0.5 to 1.5; drying is performed to 2 to 5 hours at 120 to 180 DEG C; the temperature is raised from room temperature to 820 to 950 DEG C by a muffle furnace; roasting is performed for 2 to 6 hours; titanium oxide spherical powder with the Ti4O7 content being 90 percent or higher is obtained.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY

Stannic oxide pressure sensitive resistor composite powder material and preparation method thereof

InactiveCN104211389ALess adulteratedDoping loss is smallTin dioxideWater baths
The invention relates to a stannic oxide pressure sensitive resistor composite powder material with excellent properties, and a preparation method thereof. The powder material is prepared from SnO2, Co2O3, Bi2O3, Pr2O3 and Y2O3. The preparation method comprises the following steps: by adopting a chemical coprecipitation method and by taking absolute ethyl alcohol as an organic solvent and polyethylene glycol as a dispersing agent, adding stannic chloride, tribismuth chloride, tricobalt chloride, praseodymium nitrate and yttrium nitrate, dissolving the components into a transparent solution in a constant temperatue water bath environment, dropwise adding an ammonia water solution used as a precipitator into the transparent solution at a uniform speed, precipitating, filtering, washing, drying, grinding and calcining, thereby obtaining the stannic oxide pressure sensitive resistor composite powder material. The stannic oxide composite powder with excellent properties is essential to manufacturing of high-performance pressure sensitive resistors. The stannic oxide composite powder prepared by using the method disclosed by the invention has the advantages of small particle size, uniform modified oxide distribution and narrow particle size distribution. The stannic oxide pressure sensitive resistor composite powder material disclosed by the invention is simple in preparation method, precise and controllable in component, relatively good in product morphology consistence and excellent in electric property.
Owner:XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI

Special machine tool equipment for laser cladding of high-entropy alloy

The invention discloses special machine tool equipment for laser cladding of high-entropy alloy, and relates to special equipment for laser cladding of high-entropy alloy, which comprises a special machine tool body for laser cladding of high-entropy alloy, a chuck for clamping a workpiece is arranged on the special machine tool body for laser cladding of high-entropy alloy, and the chuck is driven by a servo motor arranged in a servo motor box. An electric tailstock used for being matched with clamping and rotating of a workpiece, a sliding rail used for installing a cladding head, a laser device and a powder mixing system are arranged on the special machine tool body for laser cladding of the high-entropy alloy. The machine tool head servo motor can drive the workpiece to rotate at a high speed so as to ensure that the molten pool can move at a high speed in the laser cladding process, so that the high-speed rotation of the workpiece enables the cooling speed of the molten pool to be further increased, diffusion of elements and segregation of the elements can be effectively reduced, the grain size can be effectively reduced, and the mechanical and corrosion-resistant performance of a coating can be improved.
Owner:安徽铭谷激光智能装备科技有限公司

A kind of thermal deformation rare earth permanent magnet material and preparation method thereof

The invention relates to a preparation method of a thermal deformation rare-earth permanent magnet material. The method comprises the following steps of (1) providing main magnetic powder and low-melting-point alloy powder separately, wherein a chemical formula of the main magnetic powder is Re<x>Fe<100-x-y-z>M<y>B<z> according to the mass percent, the chemical formula of the low-melting-point alloy powder is ReCu<100-a>, Re is one or more of Nd, Pr, Dy, Tb, La and Ce and a is smaller than or equal to 90 and greater than or equal to 60; (2) mixing the main magnetic powder with the low-melting-point alloy powder evenly to obtain mixed magnetic powder, wherein the mass ratio of the low-melting-point alloy powder in the mixed magnetic powder is greater than 0 and smaller than or equal to 10%; (3) carrying out hydrogenation-disproportionation-dehydrogenation-recombination treatment on the mixed magnetic powder and diffusing a low-melting-point alloy in the treatment process to obtain HDDR magnetic powder; and (4) sequentially carrying out hot-press molding and deformation molding on the HDDR magnetic powder to obtain the thermal deformation rare-earth permanent magnet material. The invention further provides the thermal deformation rare-earth permanent magnet material.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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