52results about How to "High powder activity" patented technology

The invention provides an application method of cold field plasma discharge assisted high energy ball milled powder and a plasma assisted high energy ball milling device using the cold field plasma discharge assisted high energy ball milling method. The method comprises the following steps: utilizing dielectric barrier discharge to generate plasmas, introducing a dielectric barrier discharge electrode bar into a high-speed vibrating ball-milling tank, on one hand, requiring a solid insulating medium on the outer layer of the electrode bar to simultaneously bear high-voltage discharge and mechanical shock failure of the grinding ball, and on the other hand, requiring the high-speed vibrating ball milling device to uniformly process the powder. The method is based on the ordinary ball milling technology; the processing efficiency and the effect of the ball mill can be greatly improved by the following steps: under a non-heat-balance discharge condition of the pressure that the discharge space pressure is set to be about 102-106 Pa, introducing the discharge plasmas to input another effective energy to the processed powder, promoting the powder to be processed to be subjected to combined action of the mechanical stress effect and the heat effect of the external electric field, and further accelerating refining of the powder and promoting the alloying progress.

The invention discloses a preparation method of superfine low-sodium alpha-alumina powder with high activity. Industrial aluminum hydroxide is taken as a raw material; alkali is removed and adsorbed by adding an acid; a compound mineralizer is added to calcine; the superfine low-sodium alpha-alumina powder with high activity, of which the mean grain size D50 is 0.2-1.0micron, is obtained by combining dry ball milling with wet ball milling; the sodium content is 0.01%-0.05%; and the content of the alpha phase is 97%-99%. The problems that the alpha-alumina is high in sodium content, uneven in grain size, poor in sintering activity and the like are solved, special requirements of high-performance ceramic, grinding and polishing materials and the like are met, and the method has the advantages of being simple in process, environmentally friendly, low in cost and the like, and is suitable for large-scale production.

A cleaner production method for preparing superfine powder through a self-propagating metallurgy method is carried out according to the following steps: (1) mixing and conducting ball-milling on the powdery oxide and magnesium powder, then compacting into a blank, putting the blank into a self-propagating reaction furnace to cause a self-propagating reaction, and naturally cooling to the room temperature to obtain a coarse product; (2) using hydrochloric acid to leach and separate magnesium oxide in the coarse product after breaking, and filtering to obtain a solid phase and a leaching agent; (3) washing and drying the solid phase and making the solid phase into ultrafine powder; (4) processing the leaching agent through a spray-pyrolysis mode to obtain a nanoscale magnesium oxide and pyrolysis tail gas, wherein the hydrogen chloride in the pyrolysis tail gas is absorbed to form hydrochloric acid and is circularly used back in the leaching process. The cleaner production method producing the ultrafine powder through the self-propagating metallurgy mode has the characteristics of low material cost, low energy consumption, simple operation, low requirement on process conditions and the like, and the product is high in purity, small in particle size and high in powder activity.

The invention relates to rare earth hafnate high-entropy ceramic powder through low-temperature synthesis and a preparation method, wherein the chemical formula of the rare earth hafnate high-entropyceramic powder is (5RE0.2)2Hf2O7, and rare earth elements RE are La, Ce, Nd, Pr, Sm and Eu. The preparation method specifically comprises the following steps: by taking hafnium tetrachloride (HfCl4) and hydrated rare earth nitrate (RE(NO3)3.xH2O) as raw materials and selecting urea as a combustion agent, mixing the components in a solution, combusting in an air atmosphere at a low temperature to generate fluffy powder, and carrying out high-temperature carbon removal treatment to obtain high-purity (5RE0.2)2Hf2O7 powder. Compared with high-energy ball milling, spray pyrolysis, coprecipitationand other oxide high-entropy ceramic synthesis methods, the method has the advantages of low synthesis temperature, simple operation, high preparation speed and the like.

The invention relates to an ultra-fine grain hard alloy which comprises WC, a binding phase and a grain growth inhibitor. The weight percentage content of the WC is 83%-96%, the average grain size is(0.2-0.6) micron, the WC grain size deviation coefficient K is larger than or equal to 0.54 and smaller than or equal to 0.61, the grain number percentage of the WC with the grain size larger than 3 times and smaller than 5 times is smaller than or equal to 5%, and the grain number percentage of the WC with the grain size larger than 5 times is smaller than or equal to 1.1%; and the binding phaseis Co, the content of Co in percentage by weight is 3%-15%, and the grain growth inhibitor comprises Cr3C2, VC, TiC and/or Ti (C, N). The invention further relates to a preparation method of the superfine hard alloy. An end mill or a drill bit manufactured by adopting the ultrafine grain hard alloy has excellent use performance in high-speed or high-efficiency cutting machining of difficult-to-machine materials such as stainless steel, a titanium alloy, PCBs, acrylic, glass fibers, hardwood, resin and CFRP.

The invention relates to a method for removing gas phase hydrogen chloride from dichloropropanol to produce epichlorohydrin. The method comprises the steps of: 1. filling a tubular reactor or a fixed bed reactor or a fluidized bed reactor with an atom mixed alkaline catalyst; 2. sending dichloropropanol produced by glycerol chlorination in last process into the tubular reactor or the fixed bed reactor or the fluidized bed reactor to undergo reaction; 3. directly removing the gas phase hydrogen chloride generated in step 2 reaction to obtain crude epichlorohydrin; 4. performing purification treatment on the gas phase hydrogen chloride removed in step 3, then conducting compression to a pressure of more than 0.2MPaG and subjecting the compressed hydrogen chloride to cyclic utilization in the procedure of production of dichloropropanol by the last process of glycerol chlorination.

The invention belongs to the field of refractory materials, and particularly relates to a method for synthesizing aluminum-rich spinel through a low-temperature solid-phase reaction. The method specifically comprises the following steps: firstly, mixing 80-90 parts by weight of an aluminum oxide raw material, 10-20 parts by weight of a magnesium oxide raw material, 0.5-2 part by weight of magnesium aluminate spinel micro powder and 0.5-3 part by weight of an additive, and co-grinding the materials until the particle size of the raw materials is in a range of 5-20 microns; transferring the co-ground powder into a high-temperature kiln, heating to 1000-1500 DEG C, and calcining; and finally, keeping for 3-12 hours at the calcining temperature, and implementing naturally cooling or quickly air-cooling to room temperature to obtain the aluminum-rich spinel. A low-temperature synthesis process is adopted, the aluminum-rich spinel synthesized through low-temperature calcination is fine in grain and high in lattice defect degree, and meanwhile the prepared aluminum-rich spinel powder is high in activity. The prepared aluminum-rich spinel does not contain beta aluminum oxide or impurity phases such as free magnesium oxide, and the content of aluminum oxide in the aluminum-rich spinel reaches 80-90%. When the prepared aluminum-rich spinel powder is used in a corundum spinel castable, the aluminum-rich spinel powder has the advantages of high sintering strength and strong slag penetration resistance.

The invention discloses a method for preparing B4C nano-powder through in-situ combustion synthesis, and belongs to the technical field of powdering in a powder metallurgy process. The method comprises the steps of mixing boron oxide and magnesium powder at a molar ratio, feeding into a high-energy ball mill for mechanical activation treatment; mixing with carbon nano-powder evenly at a molar ratio, putting into a mold, pressing into a block blank at 10-60MPa and then putting into a self-propagating reactor for triggering self-propagating reaction; immersing the product into diluted hydrochloric acid and carrying out intensified leaching in a closed reaction kettle; and finally carrying out spray pyrolysis to obtain a high-purity boron carbide nano-powder product. The high-purity and high-activity nano B4C powder is prepared through the method. The method is low in raw material cost, low in energy consumption, simple in operation, and low in requirement for technological conditions and instruments and equipment; and a foundation is laid for industrial production. By adopting high-energy ball milling activation, the disadvantages of a traditional magnesium heat reduction method are improved; and by adopting a self-propagating powder technology, the product has the advantages of high purity, controllable particle size distribution and high powder activity.

The invention discloses composite zirconia powder for a solid oxide fuel cell and a preparation method of composite zirconia powder. The method comprises the following steps: adding a composite oxide additive and a PEG dispersing agent into a zirconium oxychloride aqueous solution, and performing precipitation, aging, filtration, washing and the like, wherein the composite oxide additive consists of Al2O3, TiO2, CeO2, Bi2O3 and Li2O; each component of the composite oxide additive accounts for 0.2 to 5 weight percent of the total system; a solid oxide fuel cell electrolyte piece which is prepared from the composite zirconia powder prepared by the method has the conductivity of 0.37 s/cm at 800 DEG C and the bending strength Kf of greater than 580 MPa; the application of serving as a high-performance electrolyte material in the solid oxide fuel cell can be met, and moreover, the preparation method disclosed by the invention has the characteristics of few aggregates, small particle sizes, uniform particle size distribution, high powder activity, safety and convenience in operation and the like, and is suitable for industrial batch production.

The invention relates to a vanadium-titanium slag ultrafine powder admixture and a preparation method thereof. The preparation method comprises the following steps: carrying out pre-grinding, gradingseparation, ultrafine grinding and re-separation on vanadium-titanium slag particles; wherein the specific surface area of the powder after the grading separation is 400-500 m<2>/kg; wherein the specific surface area of the resorted discharged powder is 700-800 m<2>/kg. According to the efficient preparation method of the vanadium-titanium slag superfine powder admixture, superfine powder with a high specific surface area is obtained, the hydration activity of vanadium-titanium slag is greatly improved, the contribution to cement strength is greater, the grinding efficiency is high, and efficient resource utilization of vanadium-titanium slag in cement and concrete is achieved.

The invention relates to a method for preparing a porous material by physicochemical treatment. The method comprises the following steps of: mixing a base subjected to high-temperature activation and metal solid salt to obtain a mixture; carrying out the physicochemical treatment on the mixture; and then, washing, dehydrating, drying and/or baking a product to obtain the porous material, wherein the base is zeolite, a molecular sieve, active aluminum oxide, active carbon or a metal compound porous material containing organic functional groups; the metal solid salt is nitrate, acetate or chloride containing metal cations; the physicochemical treatment comprises the step of carrying out microwave heating treatment or mechanical mixing treatment on the mixture. The porous material prepared by the preparation method disclosed by the invention has good application prospects in the fields of separation, purification, storage and the like of gas.

The invention relates to thermal-shock-resistant YbB6 ultrahigh-temperature ceramic and a preparation method thereof and belongs to the field of ultrahigh-temperature ceramic. The thermal-shock-resistant YbB6 ultrahigh-temperature ceramic has the advantages of high purity, high compactness, high strength, low elastic modulus, low shear modulus and high thermal shock resistance. The preparation method includes: utilizing high-temperature reaction to synthesize and prepare YbB6 ultrahigh-temperature ceramic powder; performing ball milling and high-temperature hot press sintering to prepare a compact YbB6 ultrahigh-temperature ceramic material. The method particularly includes: using Yb2O3 and B4C (or Yb2O3 and B) powder as raw materials, mixing according to different proportions, and obtaining high-purity YbB6 ultrahigh-temperature ceramic powder through high-temperature reaction of 1500-1750 DEG C; subjecting the YbB6 ultrahigh-temperature ceramic powder to mechanical ball milling, dry press forming and high-temperature hot press sintering at 1850-2000 DEG C to obtain compact YbB6 ultrahigh-temperature ceramic having high purity, high compactness, high strength, low elastic modulus, low shear modulus and high thermal shock resistance. The preparation method of the YbB6 ultrahigh-temperature ceramic is simple in process and needless of adding of forming auxiliary and second sintering auxiliary.

The invention discloses a preparation method for nuclear grade concentrated 10B zirconium diboride powder and a target and mainly solves the problem that in the ZrB2 powder preparation process in the prior art, the raw material concentrated 10B BC4 is expensive, great in boron loss rate and great in hot-pressing and sintering difficulty for manufacturing the target. The preparation method comprises: (1) by taking nuclear grade hafnium-free zirconyl nitrate as a zirconium source and concentrated 10B-enriching boric acid as a boron source, preparing a gel by using a sol-gel method, and heating, drying and grinding the gel into powder to prepare a precusor; and (2) by adopting argon as a protective atmosphere, and synthesizing the precusor at a high pressure by using a carbon heat reduction method to obtain the 10B-enriching zirconium diboride ultrafine powder, wherein the elemental abundance of 10B in the boric acid in the step (1) is 30-70%. The invention further discloses a method for preparing nuclear grade ZrB2 target by using the concentrated 10B zirconium diboride powder. The method disclosed by the invention has the advantages of being low in cost of raw materials, effectively reducing the boron loss rate and being simple in process and suitable for preparing the nuclear grade ZrB2 target and the like.

The invention relates to the field of alloy materials, in particular to a novel tungsten-nickel-cobalt material and a preparation method thereof. The novel tungsten-nickel-cobalt material is preparedfrom the following raw materials in percentage by weight: 95-97% of tungsten powder, 0.8-1.5% of cobalt, 1.5-3.0% of nickel, 0.1-0.5% of iron and 0-0.5% of chromium. The preparation method includes the steps of blending, wet grinding, drying, glue mixing and drying, granulating, molding, and glue discharging and sintering. The prepared novel tungsten-nickel-cobalt material has extremely high strength and toughness, and is far better than existing tungsten-nickel-cobalt materials; good high-temperature and high humidity resistance and salt mist corrosion resistance are achieved, and generationof magnetism can be avoided; compared with traditional processes, the preparation method has the characteristics of higher preparation efficiency and better preparation effect; and use of an electroplating process is avoided, and more environmental protection is achieved.

The invention provides nano ceramic-aluminum composite powder and a preparation method and device thereof. The nano ceramic-aluminum composite powder is prepared from following components by volume including 1-10 parts of aluminum alloy powder and 90-99 parts of ceramic nano particles, wherein the aluminum alloy powder is pure aluminum or 6061 aluminum alloy or 2024 aluminum alloy or 7075 aluminum alloy, the ceramic nano particles are silicon carbide or aluminum oxide or boron nitride or titanium diboride with the grain diameter of 1-50 nm, and the product is obtained after drying, ball-milling and passivating are completed. The product is high in added value, the raw materials are cheap, the preparation method is efficient, the equipment is simple, the grain diameter and the structure of the final product can be adjusted and controlled by adjusting and controlling the ball-milling time and the proportions of the raw materials, and industrial large-scale production is facilitated.

The invention relates to a blue phosphor as well as a preparation method and application thereof, and belongs to the technical field of phosphors for light-emitting diodes (LEDs) in the fields of illumination and display. According to the preparation method, Eu<2+> is used as an activator to prepare SrAl2SiO6:nEu<2+>(n=0.006-0.008) blue phosphor by a sol-gel method. By adopting the preparation method provided by the invention, the raw materials can be uniformly mixed, and the powder activity is high, thereby greatly reducing the sintering temperature in a later stage, saving energy, and facilitating the reaction; a formed sample is good in purity, and can be matched with an ultraviolet type and/or a near ultraviolet type LED chip; the preparation process is simple, and the production process is easy to operate.