41results about How to "Well distributed holes" patented technology

The invention discloses a low porosity closed cell foam aluminum alloy preparation method comprising the steps of, (1) heating aluminium alloy to melting, (2) charging 0.5-5% thickener, stirring the aluminium alloy to increase thickness, (3) charging foaming agent 0.2-5.0 wt% of aluminium alloy, stirring homogeneously, (4) stirring 10s-180s again, (5) extracting the stirring paddle, (6) subjecting the thermal insulated foam aluminium alloy flux to simultaneous cooling. The invention also discloses a closed cell foam aluminium alloy with low factor of porosity.

A micro-nano processing method of an aluminum or aluminum alloy surface includes a step of placing aluminum or an aluminum alloy as an anode in an electrolyte containing hydrochloric acid, sulfuric acid, phosphoric acid, and an etching inhibitor for DC electrochemical etching, where the concentration of hydrochloric acid is 1.5 to 3 mol / L, the concentration of sulfuric acid is 0.9 to 1.2 mol / L, and the concentration of phosphoric acid is 0.6 to 1 mol / L. A method for integrating aluminum or an aluminum alloy and a plastic includes the following steps: forming a micro-nano porous structure on an aluminum or aluminum alloy surface by using the micro-nano processing method; and closely combining a plastic and the aluminum or aluminum alloy surface by means of the micro-nano porous structure. An aluminum or aluminum alloy structure has a micro-nano porous structure formed on the surface of the aluminum or aluminum alloy structure by using the micro-nano processing method. By using this method, the micro-nano hole processing efficiency is high, the quality is high, and the method is environmental friendly.

The invention discloses a method for preparing an impregnated cathode matrix and relates to technology of microwave devices. The method is used for preparing a tungsten sponge matrix of an impregnated barium and tungsten cathode. Tungsten particles of different sizes are prepared into uniform spherical particles by particle spray drying powder treating technology, so that the flowability of tungsten powder is enhanced; and after being filled into a rubber sleeve, the treated tungsten powder can be beat, tamped or vibrated to form a close-packed structure, and then the close-packed structure is pressed and sintered to prepare the tungsten sponge matrix. The method is simple and practicable, the prepared impregnated cathode matrix has the advantages of uniform hole size, uniformly distributed holes, few closed holes and the like.

The invention specifically relates to a carbon-coated porous vanadium nitride nanowire film and a preparation method thereof. The preparation method comprises the following steps: 1) preparing vanadium pentoxide nanowires, and diluting the vanadium pentoxide nanowires by water to obtain a dispersion liquid with a concentration of 0.3mg / mL; 2) taking 100mL of the dispersion and uniformly stirring, adding trishydroxymethyl aminomethane buffering liquid and then stirring, then adding 10-200mg of dopamine hydrochloride, stirring for 0.5-4h until the solution is dark green, cleaning the polymerized sample by deionized water, and drying in a drying box to obtain a polydopamine-coated vanadium pentoxide nanowire film; 3) placing the dried-formed sample film in a tubular furnace and carrying out a heat treatment, insulating for 3h at 300-1000 DEG C under an NH3 condition, and naturally cooling to a room temperature with the furnace, so as to obtain the carbon-coated porous vanadium nitride nanowire film. The method disclosed by the invention is reliable in preparation process, low in energy consumption and high in yield; the prepared carbon-coated porous vanadium nitride nanowires are uniform in distribution, obvious in pore structure, controllable in length, and suitable for the field of electrochemistry.

The invention relates to a preparation method of ZnO nanometer powder with a sheet-like porous structure. The mixed solution of zinc acetate solution and urea solution is placed in a microwave oven, and reacted for 30-60 minutes at a power of 500-900W, and the reaction temperature is 60-60 minutes. At 95°C, the resulting turbid solution was separated, washed and dried to obtain a basic zinc carbonate precursor. Calcining the basic zinc carbonate precursor at 400-600° C. for 1.5-3 hours to obtain porous ZnO nanometer powder. The nano ZnO product prepared by the method of the invention is a white powder, belongs to the hexagonal crystal system, has large specific surface area, high purity and good product quality.

The invention relates to a method for preparing flake porous ZnO nano powder, which comprises the following steps: adding ammonia into solution of zinc nitrate dropwise, and adjusting the pH of the solution to between 6 and 8; under the condition of stirring by magnetic force at the rotating speed of 0 to 180r / m, performing reaction at the temperature of between 0 and 80DEG C for 0.5 to 3 hours; separating, washing and drying the obtained cloudy solution to obtain a crosslinked flake and dispersed flake basic zinc nitrate precursor; and calcinating the basic zinc nitrate precursor with the two appearances at the temperature of between 220 and 500DEG C for 0.5 and 3 hours to obtain the flake porous ZnO nano powder. The nano ZnO product prepared by the method is white powder, belongs to a hexagonal system, has large specific surface area, high purity and good product quality, and responds to gas such as ethanol and acetone sensitively.

The invention dis closes a nanomater granule of mesoporous calcium phosphate which is used as medicine carrier. It comprises Ca10(PO4)6(OH)2, the crystalline is nanometer banded shape, the width of band is 40-150 nm, length is 5-10 um, specific surface area is 160-280 m2.g-1 and the acverage bore diameter is 3-8 nm. The said prepartion process comprises following steps: adding phosphate radical solution, calcium ion solution in order into solution containing surface active agent and cosurfactant, getting mixing solution; dripping alkaline liquor slowly and stirring at the same into mixing solution to regulate pH to 8-11; stirring for reaction for 1-48 hours and getting reaction product of white deposition; washing white deposition with organic dissolvent and water and getting nanomater granule of mesoporous calcium phosphate. The product is characterized by no toxicity, good biocompatibility, high medicine carrying amount and a certain degradability.