55results about How to "Evenly distributed" patented technology

The invention relates to a mullite-based ceramic material and a preparation method thereof, and belongs to the technical field of refractory ceramic materials. The preparation method specifically comprises the steps of S1, mixing and ball-milling raw materials to obtain mixed powder; S2, stirring and mixing the mixed powder, a phosphate binder and a polyvinyl alcohol aqueous solution, and aging to obtain an aged material; S3, carrying out compression molding on the aged material, and drying to obtain a dried green body; and S4, placing the dried green body in a corundum crucible paved with aluminum fluoride trihydrate powder, covering, performing heat treatment, and cooling to obtain a mullite-based ceramic material. The mullite-based ceramic material prepared by the preparation method has high whisker content, the whiskers with different sizes are uniformly distributed in a matrix, and the phosphate binder and the needle-like mullite whiskers formed in situ at tiny gaps have a synergistic effect, so that the strength and toughness of the mullite-based ceramic material are improved.

The invention relates to a preparation method for a ceramic ball enhanced magnesium based composite, and belongs to the field of preparation of structure materials. Ceramic balls and water glass are mixed evenly according to a certain proportion and put into a ceramic tube mold to be made into a blank body, and the blank body is dried in a drying box for a certain time, so that a ceramic ball prefabricated blank body with certain strength is prepared. The obtained ceramic ball prefabricated blank body is put into a hydraulic machine mold, then molten magnesium alloy obtained after melting is poured into the hydraulic machine mold, a press head carries out pressurization, and the pressure is maintained for a certain time, so that the ceramic ball enhanced magnesium based composite is obtained. The preparation method is mainly used for overcoming the defects in the prior art, enables the ceramic balls to be dispersed evenly, does not have interface reaction, is simple in process, is convenient to operate, and is better applied to industrial production.

The invention discloses a high-pressure cooling turning tool, relates to a turning tool, and solves the problems that when the conventional turning tool turns a difficultly-machined material, cutting fluid cannot be sufficiently sprayed to a cutting area due to insufficient cooling and lubricating capacity, and cut chip winds a workpiece and is difficultly broken off due to insufficient chip breaking capacity. The high-pressure cooling turning tool comprises a tool handle, a tool bit and a tool blade, wherein the tool bit is fixedly connected to the front end of the tool handle; the tool blade is embedded into the front end of the upper end surface of the tool bit; the tool blade is fixedly connected with the tool bit through a fastening mechanism; a threaded bind hole is formed in the lower end surface of the tool bit; the tool bit is connected with a high-pressure pipe head through the threaded bind hole; a plurality of cooling liquid passages are formed in the tool bit; one end of each of the plurality of cooling liquid passages is communicated with the threaded bind hole; the other ends of the plurality of cooling liquid passages are arranged towards the front end of the tool blade. The high-pressure cooling turning tool is used for turning a difficultly-machined metal material.

The invention discloses a silicon-containing water repellent finishing agent. The silicon-containing water repellent finishing agent is formed by blending 86-122 parts of an organosilicon modified acrylate emulsion and 72-94 parts of an organosilicon modified polyurethane emulsion. The organosilicon functional monomer using a Si(CH3)3 group is adopted, because of large steric hindrance and non-hydrolysis, the stability of emulsion polymerization is greatly improved, the content of silicon in polymer is increased, the distribution of organosilicon in a polymer molecular chain is enabled to be balanced, and the water repellency of the polymer is enhanced. Based on the complementary properties of polyurethane and polyacrylate, the two emulsions are blended and compounded to obtain the composite finishing agent with excellent water repellency. By introducing diacetone acrylamide and adipic dihydrazide into the emulsions, the crosslinking sites in the system can be increased and the self-crosslinking performance can be improved after the two emulsions are blended to form the moderate temperature self-crosslinking finishing agent, and the baking temperature can be appropriately reduced.

The invention discloses an atomic layer deposition-based vacuum coating device for solar cell production. The device comprises an outer cavity, an inner cavity, a spray plate, a heating system, a cooling system, a process gas system, a tail gas treatment device and a vacuum pump, wherein the inner cavity is arranged in a support in the outer cavity, and the spray plate is arranged at the top of the inner cavity and is a top cover of the inner cavity; the heating system is arranged at the outer side of the inner cavity, the cooling system is arranged at the outer side of the outer cavity, the process gas system is connected with the inner cavity through a process gas pipeline and a pulse valve, and the inner cavity is sequentially connected with the tail gas treatment device and the vacuum pump through a vacuum pipeline; and the spray plate is fixedly connected with the inner cavity through an inner flange of the inner cavity, and fixed with an outer cavity cover through a connection shaft and a spring. Solar cells are vertically placed on bearing boats in batches, and the plurality of bearing boats are arranged in the inner cavity simultaneously; and the solar cells are parallel to a process gas flowing direction.

The invention discloses preparation and a catalytic application of carbon material supported ruthenium nanoparticles. Specifically, the average particle size of the prepared ruthenium nanoparticles isabout 2.2 nm, and the ruthenium nanoparticles are uniformly distributed on a substrate carbon material. The material can catalyze a hydrogen transfer reaction for synthesis of secondary amine from raw materials including aromatic methanol and aromatic amine and has the characteristics of high conversion efficiency, wide application range, mild reaction conditions and the like. After a conversionreaction ends, a catalyst is centrifugally separated from a reaction system, the next round of reaction can be performed through simple washing and drying, the stability can still be kept after 5 times of circulation, and the catalytic activity of the ruthenium nanoparticles is not remarkably reduced.

The invention discloses a high-thermal-conductivity corrosion-resistant CuFe alloy which comprises the following components in percentage by mass: 0.1-5.0% of Fe, not more than 0.1% of element M and the balance of Cu and inevitable impurities, wherein the element M is at least two of Cr, Al, Ni, Sn, Si, P, Ge and V. The invention further provides a high-thermal-conductivity corrosion-resistant CuFe alloy plate strip and a preparation method thereof. According to the high-thermal-conductivity corrosion-resistant CuFe-series alloy, the element M is added, the element M and Fe cooperate with each other to achieve a synergistic effect, a strengthening phase in the alloy is uniform in distribution and good in thermal conductivity, a compact oxide film is formed, and the thermal conductivity and corrosion resistance of the alloy are good.

The invention discloses a fuel cell leveling layer composition and a preparation method thereof as well as a gas diffusion layer. The leveling layer composition comprises a conducting carbon material, an organic pore creating material, a water retention agent, a solvent and a hydrophobing agent, and the mass ratio of the conducting carbon material, the organic pore creating material, the water retention agent and the hydrophobing agent is 1:0.1 to 0.5:0.5 to 10:0.01 to 1. The leveling layer composition can effectively reduce the poriness on the surface of carbon paper, increase the mechanical strength of the gas diffusion layer and reduce the constriction resistance between a leveling layer and a catalyst layer, and the gas diffusion layer containing the leveling layer composition has higher surface smoothness, good ventilation property and water transmissibility, and no fine cracks.

The invention relates to a method for preparing nanometer flaky yttrium oxide powder. The method is characterized by comprising the following steps of: preparing a yttrium-containing inorganic acid salt solution, regulating the solubility of yttrium-containing inorganic acid salt to be 0.1 to 0.5 mol/L, regulating the PH value by using alkaline liquor until the solution is white colloidal suspension, transferring the suspension to a hydro-thermal reaction kettle, and performing hydro-thermal treatment at the temperature of between 80 and 200 DEG C for 24 to 48 hours; after cooling to room temperature, performing centrifugal separation to obtain a precursor; washing the precursor for 4 to 6 times by using deionized water, and washing for 3 to 5 times by using alcohol to remove residual acid radical ion impurities fully; and drying at the room temperature, and calcining at the temperature of between 600 and 800 DEG C for 3 to 6 hours to obtain the nanometer flaky yttrium oxide powder. The flaky yttrium oxide powder prepared by the method is high in dispersity, the grain diameter ranges from 100 to 300 nanometers, the flaky thickness ranges from 10 to 20 nanometers, and a ratio of the diameters of crystal grains to the flaky thickness is (10-30):1. The prepared nanometer flaky yttrium oxide powder can be used as a template material for texturing ceramics and a ceramic additive, and also can be used for preparing high-temperature resistant and corrosion resistant structural materials. The method is simple, and low in cost, and reaction temperature and reaction pressure is low; and granules are flaky, have the nanometer-scale grain diameters and a good dispersing effect and are distributed uniformly and high in purity, so the method is suitable for industrial production.

The invention discloses a red cell membrane encapsulated polyester-type As2O3-supported nano particles and a preparation method thereof. The nano particle employs the red cell membrane as shell and a polyester-type material as a core. The polyester-type material is supported with the As2O3. The particle size of the nano particle is about 200 nm. The nano particle has a round shape and is uniformly distributed, has a clear core-shell structure and good stability, is free of causing hemolysis and agglutination of red cells and can be used in intravenous injection. The drug delivery system, compared with a free medicine, has significantly sustained releasing effect, and can solve the problem of quick increase of blood concentration after intravenous injection of the As2O3. Because that substances, being 3-400 nm in size, are generally not discharged from kidney or a rejection system, so that the drug delivery system has advantages in circulation in blood system and achieves passive targeted effects; the blood concentration of a toxic medicine is reduced and further toxicity is reduced, so that a new strategy for development of toxic antitumor medicine preparations is provided.

The invention discloses a broadcast sowing planting method for millets. The broadcast sowing mode is adopted to sow two kinds of seed-grains at the same field simultaneously. A seed-grain I having resistance to weed killer A and having higher seedling plants at 3-4 leaf stage and a seed-grain II having no resistance to weed killer A and having shorter seedling plants at 3-4 leaf stage are selected and are pelletized respectively; then the processed two seed-grains are well mixed and sowed through broadcast sowers at a sowing density of 400 to 500 plants per square meter; waiting until the grain seedlings grow to 3-4 leaf stage, using the weed killer A to remove the grain seedlings of seed-grain II and keep the seed-grain I for continuous growth; waiting until the seed-grain I turn mature and harvesting. The method for sowing millets has changed the traditional planting mode; through selecting two kinds of seed-grains for broadcast sowing, the problems such as irrigation ears and surface soil hardening leading to dead seedlings caused by rainfall in rainy season are eased; dead seedlings caused by sunburn and earth surface transpiration are reduced; when the grain seedlings grow to 3 to 4 leaf stage, unwanted grain seedlings are killed and the yield of kept grain seedlings can be substantially increased.

The invention discloses a preparing method for modified fluorgypsum powder for plastering anhydrite. The preparing method comprises the steps that fluorgypsum is ground and smashed, and thermal treatment is carried out; water is added in kaolin, then blending is carried out to obtain pulp, sodium hexametaphosphate and sodium hydroxide are added, stirring is carried out in water bath, standing is carried out, the upperlayer slurry is taken and centrifugally separated, drying and smashing are carried out, and modified kaolin is obtained; desulfurization gypsum, ardealite and water are added in the fluorgypsum obtained after thermal treatment and are evenly stirred, the modified kaolin is added after the temperature is increased, stirring and cooling standing are carried out, an exciting agent is added and evenly mixed, roasting is carried out, the mixture is cooled to the room temperature, a light material, blend fibers, a water-retaining agent, an active agent, polyvinyl alcohol and a foaming modifier are sequentially added and evenly stirred, standing aging and fine grinding are carried out, and the modified fluorgypsum powder for the plastering anhydrite is obtained. The modified fluorgypsum powder is short in condensing time and excellent in mechanical strength, all performance indexes of the modified fluorgypsum powder exceed the requirements of the standard of the plastering anhydrite, the modified fluorgypsum powder can be used as a wall plastering material, and the waste fluorgypsum is turned into wealth.

The invention belongs to the technical field of luminescent devices, and particularly relates to an LED fluorescent lamp. An outer shell of the LED fluorescent lamp is composed of a base and a hood, the hood is made of a polycarbonate material, the base is made of an aluminum alloy material, and the aluminum alloy material comprises, by weight, 0.02-0.16% of Ag, 0.5-1.8% of Cu, 0.3-1.0% of Mg, 0.11-0.66% of porous silicon dioxide, 0.5-2.4% of nano-silicon carbide, and the balance Al.

The invention belongs to the technical field of metal-organic framework materials, and relates to a method for preparing a polynary nano-cage composite material by using a zeolitic imidazolate framework as a template. The method comprises the following steps: synthesizing a ZIF-67 framework through a solvothermal technology by using methanol as a solvent, and synthesizing a hydroxide precursor from nickel nitrate and zinc nitrate by adjusting a mass ratio of the zinc nitrate to the nickel nitrate; and sequentially centrifuging, washing, drying and calcining the hydroxide precursor to obtain the nano-cage composite material. The method has the advantages of simple process, low price, easiness in control, and low cost, and the prepared product is a nano-cage composite material having a non-spherical hollow structure, and has the advantages of large specific surface area, high crystallinity, good morphology, and easiness in realization of industrialization.

The invention discloses a preparation method of submicron Eu<3+>: beta-Li2TiO3 high-purity red fluorescent powder. The preparation method comprises dissolving Li2O particles in distilled water to obtain a LiOH solution with a mole concentration of 0.10-3.00mol/L, adding a Ti source and an Eu source into the solution, carrying out mixing to obtain a uniform mixture, carrying out a hydrothermal reaction process in an oven at a temperature of 100-240 DEG C for 1-20h, carrying out furnace cooling, taking out the hydrothermal reaction product, carrying out drying, carrying out uniform grinding, carrying out calcination in an electric resistance furnace at a temperature of 500-700 DEG C for 6-36h, carrying out furnace cooling and carrying out grinding.