103results about How to "High degree of sphericity" patented technology

The invention relates to a self-heat-insulating fly ash autoclaved aerated concrete block which comprises the following components in parts by weight: 1400-2200kg of fly ash, 330-400kg of cement, 390-550kg of quicklime, 100-200kg of white lime, 50-100kg of desulfurized gypsum, 255-420kg of block waste, 2.15-2.90kg of aluminum powder paste and 0.20-0.50kg of foam stabilizer. According to the invention, the fly ash, desulfurized gypsum and excessive cut waste from a power plant are fully utilized, and meanwhile, the Level B04, Level B05, Level B06 and Level B07 self-heat-insulating fly ash aerated concrete blocks can be prepared. The block products contain a large amount of micro and macro pores, and are uniform in pore size, low in heat conductivity coefficient and favorable in self-heat-insulating property.

The present invention relate to a binderless molecular sieve catalyst and a process for preparing the same, which are mainly useful for solving the problems of the current catalysts, such as lower activity, less pore volume and worse diffusivity. The present invention relates to a novel binderless molecular sieve catalyst, comprising, based on the weight of the catalyst, 90-100 wt. % of a molecular sieve, 0-10 wt. % of a binder, and 0-10 wt. % of an anti-wear agent, wherein said catalyst has a pore volume of 0.1-0.5 ml/g, an average pore diameter of 50-100 nm, and a porosity of 20-40%; the anti-wear agent is selected from the rod or needle-like inorganic materials having a length/diameter ratio of 2-20. Said catalyst has the advantages of higher activity, greater pore volume, larger average pore diameter and porosity, and better diffusivity, and well solves said problems and can be used for the industrial preparation of binderless molecular sieve catalysts.

The invention discloses metal powder for a 3D printer. The metal powder for 3D printers is 10-50-micron metal powder made by agglomerating many submicron order metal particles through a granulating process. As the metal powder is combined by submicron order metal particles, the metal powder is low in melting point and high in melting speed, so that the printing speed of the metal 3D printer can be increased and the precision of a printing member can be improved. Meanwhile, the average grain size of the metal powder is equivalent to existing atomized metal powder for 3D printers, and the metal powder has good dispersibility and conveying property, and can be suitable for existing 3D printer equipment.

[Summary]

[Problems] To provide extremely-spherical-three-dimensional-shaped particles of crystalline mannitol containing large hollows and gaps inside.

[Solution] Spherical particles of crystalline mannitol made by spray drying, extremely spherical (having an aspect ratio of 1.0 to 1.2), high oil absorption rates according to test method A, wherein powder has a mean particle diameter of 15 to 165 μm, a loose bulk density of 0.35 to 0.60 and an angle of repose of 30 to 50 degrees, and has a hardness of 7 to 20 kgf, when directly compressed.

The invention relates to a method for preparing a fracturing propping agent special for shale gas from fly ash. The method comprises the following steps of: performing wet grinding on the fly ash, kaolinite, a high-activity compound sintering aid and a small amount of industrial coke to form mixed slurry in a ball mill; performing primary granulation on the mixed slurry in a fluidized bed spray granulator; performing secondary granulation by using powdered coal slurry formed by wet grinding of coke as coating liquid; putting balled granules into a crucible; and putting the crucible into an electric furnace for ultralow temperature self-propagating sintering, cooling naturally and then taking the crucible out of the electric furnace to obtain the fracturing propping agent special for shale gas. By adopting the method, the raw material has a wide source, the temperature of the self-propagating sintering is low, the sintering period is short, energy resources are saved, a low-carbon environmental protection effect is achieved, and the comprehensive performance of the product is improved; a shaping method adopted in the method is low in energy consumption, the production process is simple and easy to control, and the product quality is stable; and the prepared propping agent is low in density and high in strength, has excellent characteristics of high-temperature resistance and corrosion resistance, and can provide a fracturing material with better performance for medium and deep layer shale gas fields.

The invention provides aluminum powder for 3D (three-dimensional) printing. In the aluminum powder, white carbon black serves as a carrier. A preparation method of the aluminum powder comprises the following steps of fusing aluminum at the temperature of 680 DEG C in a vacuum environment; staying the fused aluminum in gaps of the white carbon black; and performing argon protecting grinding on the fused aluminum to form spherical aluminum powder of which the average grain diameter is 50-100 nanometers and the degree of sphericity is above 0.75. Monomers wrap the surface of the aluminum powder in a gathered manner, so that the oxygen content of the spherical aluminum powder is reduced; and influences of aluminum oxide on fusion of the aluminum are avoided, the fusing temperature of the obtained aluminum powder is low, the aluminum powder is fused uniformly, tissues in metal are uniform when the aluminum powder is used for 3D printing, the forming precision of products is improved, and the aluminum powder can be used for preparing precise metal products of complicated components.

A method of making porous silicon using a chemical etchant comprising metal ions is described.

[Problem] To provide a method of producing aluminum nitride that has high conducting property and can be excellently filled and is useful as a filler for heat-radiating materials, and an aluminum nitride powder obtained by the same method.

[Means for Solution] An aluminum nitride powder is produced by reducing and nitriding:

• • an alumina powder or a hydrated alumina powder having a primary grain size of 0.001 to 6 μm; and
  • a powder of a compound containing a rare earth metal element and having an average grain size in a range of 2 μm to 80 μm, the average grain size being not less than 6 times as great as the primary grain size of the alumina powder or the hydrated alumina powder;
  • in the presence of a carbon powder at a temperature of 1620° C. to 1900° C. for not less than 2 hours.

Fine spherical thermoplastic resin particles are produced by preparing a resin composition including a matrix of a water-soluble material, and fine particles of a water-insoluble thermoplastic resin dispersed in the matrix, the fine particles and the matrix each being melted or softened in the resin composition; cooling and solidifying the resin composition under such conditions that the resin composition does not undergo deformation due to stress; and removing the water-soluble material by washing with water to thereby yield fine spherical particles containing the water-insoluble thermoplastic resin. This method has wide applicability, applies less loads on the environment, does not require special devices, can be easily conducted, and can efficiently produce such particles. The resulting particles are highly spherical.

[Problems]

To provide a spherical aluminum nitride powder that features high thermal conductivity and filling property, and that is useful as a filler for a heat radiating material, and a method of producing the same.

[Means for Solution]

A spherical aluminum nitride powder comprising aluminum nitride particles having an average particle diameter of 3 to 30 μm, a sphericalness of not less than 0.75, and an oxygen content of not more than 1% by weight wherein, when the average particle diameter is d (μm), the specific surface area S (m²/g) satisfies the following formula (1),

(1.84/d)≦S≦(1.84/d+0.5)   (1)

A material comprising a resin comprising unsaturated vinyl units and a magnetic material; a spherical composite composition, which is produced by a simple production process having high productivity without the need of two or more production steps; and a process of producing the spherical composite composition are set forth. The spherical composite composition can be obtained by adding a magnetic material to an aqueous medium having a resin dispersed therein, dispersing the material in the medium, and then forming the dispersion into particles by spray drying.

The invention discloses a method for producing a support agent for a petroleum well by using quartz tail sand, and relates to the technical field of quartz sand production. Through a series of steps of water washing, mechanical wiping deironing, flotation deironing, dry washing cleaning, primary grading, secondary grading, resin coating and bag charging, the quartz tail sand is successfully processed into the support agent for the petroleum well; the problems that the quartz sand has insufficient sphericity and hardness and cannot be widely applied to the support agent for the petroleum well in the prior art can be solved.

The invention provides a microwave ablation antenna. The antenna is provided with an antenna body, the antenna body comprises an inner conductor, and the outer side of the inner conductor is sequentially covered with a dielectric, an outer conductor and a shell; the antenna body extends in the axial direction, one end of the antenna body is used for being connected with a coaxial cable, the otherend of the antenna body is an antenna tail end, and the portions, at the antenna tail end, of the outer conductor and the inner conductor protrude out of the dielectric and are welded to each other; three gaps are girdled in the portion, close to the antenna tail end, of the outer conductor; the dielectric in the middle of the antenna body is axially and sequentially provided with a dielectric hollowed-out section and a thickened outer conductor extending inwards from the outer conductor. According to the microwave ablation antenna, the large ablation long diameter and ablation sphericity areobtained through a three gap joint, the ablation radius is increased through the cooperation with a pi matching joint, the comet tail effect can be well eliminated under the condition of not increasing the diameter of the antenna, the ablation sphericity is increased, the sphericity of an ablation area cannot be significantly reduced even if the microwave power is increased, and the large-range high-sphericity ablation area can be formed.

The invention provides a preparation technology of novel fracturing propping agent-polymer sand. The preparation method comprises the following steps: 1) adding styrene, divinyl benzene, a latent active monomer and an initiator into water filled with an organic/inorganic dispersant, stirring the components, heating the mixture to 70-100 DEG C, carrying out suspension polymerization reaction for 4-12 hours, and filtering, washing and drying a reaction product to obtain an intermediate product polymer microsphere; and 2) carrying out a thermal cross-linking reaction for 10-120 min at a temperature of 180-230 DEG C. The organic proppant polymer sand has the characteristics that 1) the organic proppant polymer sand is high in compressive strength at high temperature, good in temperature resistance and not easy to break; 2) a flexible latent active monomer is introduced into a molecular chain to improve the toughness and crosslinking degree of the product and reduce the dosage of a crosslinking agent, and 3) the product not only has the advantages of simple preparation and use of an organic proppant, but also has the characteristics of high temperature resistance and high strength of aninorganic proppant, and obviously improves the flow conductivity of fracturing exploitation of oil and gas fields.

An apparatus includes a housing, a crucible disposed in the housing, and a collection bin. A turnplate disposed in a powder collection area is of an inlaid structure. A concentric circular groove is provided on the atomization plane. An air hole is provided in the turnplate. The present invention combines the pulsated orifice ejection method and the centrifugal atomization method, in cooperation with the turnplate structure and subjecting the turnplate surface to induction heating, so that a metal liquid is allowed to break through the split mode of traditional molten metal, achieves a fibrous split mode that can be implemented only when an atomizing medium is an aqueous or organic solution, and prepares a high-melting-point metal powder that meets requirements, and has a controllable particle size, high sphericity, no satellite droplets, and good flowability and spreadability, and is suitable for industrial production.

The invention relates to a preparation method of spherical aluminum oxide. The method comprises the following steps: mixing pseudoboehmite powder and a forming aid, adding acid-containing deionized water, kneading, and extruding to obtain a strip plastic; putting the strip plastic in a balling device on the premise of no adhesion of the strip plastic surface to implement strip breaking and rolling granulation, spraying a misty liquid drop wetting agent while keeping the granules rotating, wetting the granule surfaces on the premise of no adhesion of the granules, stopping spraying, continuing rotation until the granules become spherical granules with smooth surfaces, changing cold air in the balling device into hot air, drying to harden the spherical granule surfaces, and stopping the rolling granulation; and drying the spherical granules, and roasting to finally obtain the aluminum oxide spherical carrier. The method solves the problems of unsmooth surface, poor sphericity and poor wear resistance in the balls prepared by the original process, and has the advantages of low preparation cost and no pollution in the preparation process.

The Cu core ball contains a Cu ball and one or more metal layer for covering a surface of the Cu ball, each layer including one or more element selected from Ni, Co, Fe and Pd. The Cu ball contains at least one element selected from Fe, Ag, and Ni in a total amount of 5.0 or more to 50.0 ppm by mass or lower, S in an amount of 0 ppm by mass or more to 1.0 ppm by mass or lower, P in an amount of 0 ppm by mass or more to less than 3.0 ppm by mass, and remainder of Cu and inevitable impurities. The Cu ball contains purity which is 99.995% by mass or higher and 99.9995% or lower, sphericity which is 0.95 or higher and a diameter of 1 μm or more to 1000 μm or lower.

A method for manufacturing single crystal ceramic powder is provided. The method includes a powder supply step for supplying powder consisting essentially of ceramic ingredients to a heat treatment area with a carrier gas, a heat treatment step for heating the powder supplied to the heat treatment area at temperatures required for single-crystallization of the powder to form a product, and a cooling step for cooling the product obtained in the heat treatment step to form single crystal ceramic powder. The method provides single crystal ceramic powder consisting of particles with a very small particle size and a sphericity being 0.9 or higher.