205results about How to "Wide particle size distribution" patented technology

Epitaxial structures, methods of making epitaxial structures, and devices incorporating such epitaxial structures are disclosed. The methods and the structures employ a liquid-phase Group IVA semiconductor element precursor ink (e.g., including a cyclo- and/or polysilane) and have a relatively good film quality (e.g., texture, density and/or purity). The Group IVA semiconductor element precursor ink forms an epitaxial film or feature when deposited on a (poly)crystalline substrate surface and heated sufficiently for the Group IVA semiconductor precursor film or feature to adopt the (poly)crystalline structure of the substrate surface. Devices incorporating a selective emitter that includes the present epitaxial structure may exhibit improved power conversion efficiency relative to a device having a selective emitter made without such a structure due to the improved film quality and/or the perfect interface formed in regions between the epitaxial film and contacts formed on the film.

A process for the preparation of toner by, for example, mixing a colorant, a latex, optionally a wax and a water solubilized silica with an alumina coating or an aluminized silica as a coagulant.

A process comprising aggregating a colorant encapsulated polymer particle containing a colorant with colorant particles and wherein said colorant encapsulated latex is generated by a miniemulsion polymerization.

The invention relates to a plasma rotary electrode powder milling set and a process thereof, relating to the technical field of powder metallurgy. The milling set comprises a rotating feeding mechanism, a vacuum furnace, a vacuum unit, a plasma gun device and an electrical source. The rotating feeding mechanism is arranged at the exterior of one side of the vacuum furnace; the plasma gun device is arranged at the interior of the other side of the vacuum furnace; the vacuum unit is communicated with the vacuum furnace through a ventilation pipe, wherein, the vacuum furnace body has a double-decker sandwich structure, and cooling circulating water is injected into the sandwich structure; a receiving mechanism is arranged at the bottom part of the vacuum furnace, wherein, the receiving mechanism comprises two cut-off valves connected in series. The process includes the following steps: metal is processed into electrode bars; low-voltage heavy current is applied to the electrode bars to melt the electrode bars in a highly vacuumized melting chamber through the high temperature produced by the cathode arc of the plasma gun, and to eject the molten metal instantly by the strong centrifugal force produced through the high-speed rotation of the electrode bars to produce fine metal powders. The invention is characterized in that the yield of perfect spherical metal powders is up to 97 percent, and the powders are free from the contamination of any microelement.

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 relates to a two-stage gasification method and a gasification device for a fuel with wide size distribution. The two-stage gasification method for the fuel with wide size distribution comprises the steps of 1) adding the fuel to a fluidized bed pyrolyzer by a feeding device; adding a gasifying agent to the fluidized bed pyrolyzer; drying/pyrolyzing or partly gasifying the fuel under semicoking of the pyrolyzer and heating of the gasifying agent; and 2) sending the solid and gas generated in the step 1) to a fluidized bed gasification furnace, adding the gasifying agent to the fluidized bed gasification furnace, finishing complete gasification of semicoke; removing tar by high-temperature pyrolysis, part oxidization and semicoke catalytic reforming in the fluidized bed so as to produce clean gas. With the adoption of the method, the traditional fuel gasification process is divided into a material pyrolysis stage and a semicoke gasification stage, which are performed in an upper fluidized bed pyrolyzer and a lower fluidized bed gasification furnace.

The invention relates to a high-solid content waterborne polyurethane emulsion with particle size polydispersity and a preparation method thereof, belonging to the technical field of high polymer materials. The preparation method comprises the following steps of: preparing a polyurethane prepolymer, diluting the synthesized polyurethane prepolymer by adding a solvent, then dividing the diluted polyurethane prepolymer into a plurality of portions, respectively adding different doses of sulfonate hydrophilic chain extender to the different portions of polyurethane prepolymer for remixing, dispersing the mixtures to deionized water, carrying out secondary chain extension and removing the solvent from the emulsion in vacuum, thus obtaining the waterborne polyurethane emulsion with the solid content being higher than or equal to 50%. The preparation method has the advantages that a catalyst is not needed, the production time is short, and the process is simple and easy to control. The prepared waterborne polyurethane emulsion is relatively wide in particle size distribution and relatively low in viscosity and can be applied to the fields of environment-friendly coatings, adhesives and the like.

The invention discloses a preparation method for a super coarse crystal WC-Co hard alloy. According to the preparation method, a proper amount of fine tungsten carbide powder is added into a raw material, and the super coarse crystal WC-Co hard alloy is prepared by proper ball milling and sintering processes, so that the super coarse crystal hard alloy with the grain size of 6.0 to 14.0 microns can be prepared successfully. The preparation method has the characteristics that the process is simple, the process is easy to control, the production cost is low, and the WC grain size distribution in the alloy product is uniform.

A catalyst for aromatizing paraffin is a non-noble metal modified nano-class zeolite molecular sieve, which is composed of MFI-type zeolite molecular sieve as carrier and the Zn and Ga as active component. It has high catalytic activity, selectivity and stability. Its preparing process is also disclosed.

This disclosure features a system for processing microspheres. A vessel contains a suspension of solidified microspheres comprising polymer and an active agent. A hydrocyclone has a fluid inlet, a first fluid outlet and a second fluid outlet. The fluid inlet is in fluid communication with the vessel and receives the suspension. The second fluid outlet contains a flow of the suspension having concentrated microspheres. The first fluid outlet contains a flow of a relatively large amount of liquid compared to the flow from the second fluid outlet. Also featured is a method of processing the microspheres using the hydrocyclone.

The invention relates to a precursor nickel-cobalt-manganese hydroxide of a ternary material used for lithium batteries and a preparing method thereof. The nickel-cobalt-manganese hydroxide is characterized in that: the general chemical formula of the nickel-cobalt-manganese hydroxide is NixCoyMnz(OH)2, wherein the sum of the x, the y and the z is 1, the x is less than 1 and more than 0, the y is less than 1 and more than 0 and the z is less than 1 and more than 0. The ternary material prepared from the nickel-cobalt-manganese hydroxide is high in compaction density, good in cyclic performance, high in thermal stability and low in self-discharge and has good comprehensive performance. The preparing method introduces a single-kettle batch production mode into a continuous production mode. A product with wide particle size distribution and more small particles is prepared by continuous production. Based on the product of the continuous production, batch production is utilized, the production process is free of generation of new small particles, only original small particles grow to be more compact, other larger particles grow at the same time, and the finished product is still wide in particle size distribution.

An alpha type cyclone separator which belongs to the isolation technique comprises a straight bowl body, a conical bowl body, an ash exhausting pipe, a coping, a liquid inlet, and a liquid outlet. The utility model is of small conical angle and long conical body structure, and the angle between the axes of the liquid inlet and the horizontal direction is of alpha. The coping is a spiral lamina with an obliquity of alpha, and an air inlet and the straight bowl boy, as well as the coping are tangent according to the obliquity alpha of the coping. The alpha is from 5 DEG C to 25 DEG C, and a second class or a second and third circumfluent cyclone separator also can be connected in series. The separating efficiency of the alpha type cyclone separator is obviously superior to a traditional hydrocyclones, and the alpha type cyclone separator is of low pressure drop, small amplification effect, high separation definition, and obvious energy saving effect. The pressure drop is about 70 percent that of traditional hydrocyclones, therefore, the utility model can satisfy the separating demand of high concentration, widely distributed granularity of solid particles, highly required technical process, and great difficulty for classification. The cyclone separator can be widely popularized and applied in chemical engineering, petroleum, metallurgy, medicine, and environmental protection field.

The invention relates to a preparation method of precision casting fused quartz powder and quartz powder produced by the method. The preparation method comprises the following steps of: smashing, sieving, purifying, fusing by an electric furnace, smashing, dry type ball-milling and sieve for a quartz raw material to obtain a product. An ultrasonic field is introduced in the scouring purifying and washing process of quartz, so that the content of impurities in powder is effectively reduced, and the step time is greatly shortened and the production efficiency is improved. Full grain fused quartz powder required is directly obtained by optimizing ball-milling process parameters and adopting a unique feeding mode, so that the grain composition step in conventional method is reduced. The method is simple in technical process, short in period, low in energy consumption and low in cost, and is beneficial for large-scale batch production. The fused quartz powder produced is high in purity, wide in grain distribution, free from graduation, mellow and full on surface of grains and good in rheological property of paint, and can be better applied to the field of investment casting and can partially or completely replace expensive shell material zircon power, so that the production cost of precision casting is effectively reduced.

The invention belongs to the technical field of high-entropy alloy and discloses a low-density and high-entropy alloy material and a preparation method of the low-density and high-entropy alloy material. The low-density and high-entropy alloy material belongs to the AlSiTi series and comprises all the three elements of Al, Si and Ti and two or more of the elements of V, Cr, Cu, Ni and the like, and the theoretical density is 4.52 g/cm<3>-5.76 g/cm<3>. The preparation method includes the steps that 1, material are prepared; 2, low-density and high-entropy alloy powder is prepared through mechanical alloying; and 3, a low-density and high-entropy alloy block is subjected to sintering synthesis, and the low-density and high-entropy alloy block can be obtained through sinter, specifically, the technical conditions include that a spark plasma sintering system serves as a sintering device, the temperature increase rate is 50-120 DEG C per minute, the sintering temperature is 900-1200 DEG C, the heat preservation time is 5-20 min, and the sintering pressure is 20-50 MPa. The density of the low-density and high-entropy alloy material is much lower than that of existing system high-entropy alloy.

The invention discloses a high-tap-density lithium-rich manganese-based positive electrode material and a preparation method therefor. The positive electrode material is prepared by two steps of precursor preparing, and mixing and calcining. The positive electrode material has relatively high tap density and relatively excellent electrochemical performance; according to the preparation method for the positive electrode material, nitrogen atmosphere protection and ammonium hydroxide which can be used as a complexing agent are not required; instead, the secondary particle precursor which comprises micron-level sphere-like primary particles and has relatively wide particle size distribution is prepared by a coprecipitation method directly; and then the secondary particle precursor and a lithium-containing compound are mixed and calcined to obtain the positive electrode material. The lithium-rich manganese-based positive electrode material is simple and reliable in preparation method and process, and suitable for large-scale and commercial production.

The invention relates to a method for preparing submicron polycrystalline diamond abrasive with narrow particle size distribution, which comprises the following steps: (1) preparing pulp; (2) reshaping; and (3) centrifugally grading. In the invention, a submicron diamond product can be prepared by reshaping polycrystalline diamond powder of a particle size of 0.5 to 10 micrometer in a planet mill, superfine mill or supersonic pneumatic mill and grading in a high-speed centrifugal machine, wherein the particle sizes of the product may be 0.125 micrometer, 0.25 micrometer, 0.5 micrometer, 0.75 micrometer, 1 micrometer and 1.5 micrometers. The performance of the product is represented by the narrow particle size distribution of the product and regular particle shape. The product of the method is very suitable for fine polishing of sapphire, precision ceramics, optical crystals and metal molds; and after a sapphire wafer for an LED substrate is polished by the 0.5-micrometer diamond prepared by the method, the surface roughness of the sapphire wafer is 2.81 nanometers. The method is short in production period and is convenient for enlarging production scale.

The invention discloses a small-particle-diameter praseodymium zirconium yellow ceramic pigment which comprises the following components in percentage by weight: 3-6% of praseodymium oxide, 48-62% of zirconium oxide, 30-38% of silicon dioxide and 3-8% of a mineralizing agent, wherein the zirconium oxide selects the product which does not remove hafnium elements in the zirconium oxide production process, wherein the atom molar ratio of zirconium oxide to the hafnium elements is greater than 40:1; silicon dioxide selects silicon dioxide aerogel, wherein the BET specific surface area is 500-800 m<2>/g, the average particle diameter is 3-8 [mu]m, and the pore volume is 3-5. The praseodymium zirconium yellow pigment is small in particle diameter and relatively stable in structure, and is hard to damage in the ceramic ink preparation process. Meanwhile, the pigment is high in color strength in transparent glaze, and fine and smooth in color tone, and can be used as the high-grade ceramic pigment.

The invention relates to a built-out powder concentrator type vertical mill combined grinding system adopting a non-metal grinding medium. The built-out powder concentrator type vertical mill combined grinding system adopting the non-metal grinding medium is characterized by comprising a material distribution bin, a weighing scale, a feeding lifting machine, a vertical mill, a V-shaped powder concentrator feeding lifting machine, a V-shaped powder concentrator, a buffering bin, an efficient powder concentrator, a system dust collector, a system draught fan, a chimney, a first finished-product conveying chute, a ball mill, a mill tail lifting machine, a second finished-product conveying chute, a mill tail dust collector and a mill tail dust collection draught fan, wherein the material distribution bin, the weighing scale, the feeding lifting machine, the vertical mill, the V-shaped powder concentrator feeding lifting machine, the V-shaped powder concentrator, the buffering bin, the efficient powder concentrator, the system dust collector, the system draught fan, the chimney, the first finished-product conveying chute, the ball mill, the mill tail lifting machine, the second finished-product conveying chute, the mill tail dust collector and the mill tail dust collection draught fan are sequentially connected. The built-out powder concentrator type vertical mill combined grinding system adopting the non-metal grinding medium can stabilize operation of the vertical mill, adjust the cement grain size grading, relieve the ball coating phenomenon in the mill, improve the grinding efficiency in the mill, lower the noise of the ball mill in the operation process, reduce the pollution to finished products, reduce the unit power consumption and improve the performance of finished cement.

A filter element comprises an oil-impregnated filtering member, and a transmission preventing layer formed on a downstream side of the filtering member, for restricting transmission of at least the carbon dusts from the oil-impregnated filtering member. The filtering member may be formed like a ridge-like-folded structure. The transmission preventing layer may be formed of a coating layer having a resistance against a viscous oil that is impregnated in the filtering member. This coating layer may be formed uniformly as a whole or the thickness or the content of the coating layer may be increased partially. A ventilation shutting-off member (filling layer) may be formed as the transmission preventing layer in the root portion areas of the ridge portions. The transmission preventing layer may comprise a resistant component that is insoluble in the oil that is impregnated in the filtering member.

The present invention relates to a separating agent for solid-phase extraction which comprises core particles of a base material; a hydrophilic polymer layer formed on the surface of the particles; and a hydrophobic polymer layer formed on the surface of the hydrophilic polymer layer. The separating agent can be used in a cartridge or a column for solid-phase extraction and the latter can in turn be used in a variety of methods such as a method for concentrating a subject to be separated; a method for removing impurities; a method for solid-phase extraction of an environmental, medicinal and/or biological samples; and a method for pre-treating a protein component-containing sample.