17results about How to "No agglomeration" patented technology

The invention relates to a non-equimolar-ratio high-entropy thermoelectric ceramic and a preparation method thereof. The chemical formula of the non-equimolar-ratio high-entropy thermoelectric ceramic is (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 (x = 0.1-0.4). Through presintering, spark plasma sintering and reduction annealing processes, a single-phase perovskite structure composed of phases of the A-site high-entropy perovskite thermoelectric ceramic is obtained, equiaxed crystal grains are arranged in the ceramic, and the morphology of the equiaxed crystal grains is matched with that of cubic perovskite structure crystal grains. Elements Ca, Sr, Ba, La, Ti and O in the ceramic are uniformly distributed in the ceramic, and no agglomeration phenomenon exists. The A-bit non-equimolar-ratio high-entropy perovskite thermoelectric ceramic (Ca1 / 3Sr1 / 3Ba1 / 3) 1-xLaxTiO3 obtained by the invention has low thermal conductivity, high conductivity and Seebeck coefficient, further shows a high thermoelectric ZT figure of merit, is simple to operate and short in time period, and provides an effective path for preparing high-temperature thermoelectric materials.

The invention relates to the technical field of PVB heat-insulating films, in particular to a PVB heat-insulating film based on indium tin oxide and bronze cesium tungsten compounding and a preparation method thereof.The PVB heat-insulating film is prepared from, by weight, 80-120 parts of PVB resin, 20-50 parts of oily plasticizer, 0.1-2.0 parts of silane coupling agent, 0.1-1.0 part of antioxidant, 0.1-1.0 part of ultraviolet light absorber, 1-5 parts of polyethylene glycol derivative and 1-5 parts of compound dispersion slurry, the weight ratio of the indium tin oxide powder to the bronze cesium tungsten powder in the compound dispersed slurry is (5: 5)-(7: 3). According to the PVB heat-insulating film based on indium tin oxide and cesium tungsten bronze compounding and the preparation method, the prepared PVB heat-insulating film has high visible light transmittance and excellent near-infrared light rejection rate, meanwhile, the Faraday cage effect can be effectively avoided, and the signal shielding problem is avoided.

The invention relates to the technical field of alumina modification, and particularly discloses a synthetic method of modified alumina, the synthetic method comprises the following steps: S1, dissolving a surfactant and a rare earth modifier 1 in a sodium metaaluminate aqueous solution to obtain a solution 1; s2, carrying out parallel flow on the solution 1 and an aluminum sulfate aqueous solution to prepare pseudo-boehmite slurry, stirring the pseudo-boehmite slurry, adding an organic solvent, dropwise adding a silane substance, continuously stirring, finally adding lanthanum nitrate, carrying out a reaction, and after the reaction is finished, filtering, washing and drying to obtain modified pseudo-boehmite powder; s3, roasting the modified pseudo-boehmite powder to obtain modified aluminum oxide; the synthesis method is simple in step and short in technological process, and the preparation time can be remarkably shortened while the thermal stability of the aluminum oxide is effectively improved.

The invention relates to a preparation method of a magnesium alloy mu-DIC speckle and a characterization method and application thereof. The preparation method comprises the following steps: 1) carrying out electrolytic polishing on a to-be-detected surface of a magnesium alloy sample until the to-be-detected surface is bright and free of scratches; 2) mixing the SiO2 suspension with alcohol according to a certain volume ratio, and performing ultrasonic dispersion to obtain a diluent; 3) placing the polished sample in a diluent for ultrasonic treatment, and then cleaning the sample with alcohol to obtain uniformly dispersed and distributed speckles; the whole preparation of the speckles is a physical process, the sample is not damaged or the properties of the sample are not changed, and the speckles prepared by the method do not interfere with the collection of other signals on the surface of the sample, so that the practicability of EBSD and DIC results is improved; the preparation method has the advantages of being simple, easy to operate, efficient, ultralow in cost and the like, the magnesium alloy material can be applied under the room temperature, high resolution and large view field, and the bottleneck problems that the magnesium alloy sample speckle preparation difficulty is large, and compatibility of the DIC technology and the EBSD technology cannot be achieved at the same time are solved.

The invention discloses a multi-element rare earth doped vanadate-based luminescent material and a preparation method thereof, and belongs to the field of rare earth luminescent material preparation. A multi-element rare earth doped vanadate-based luminescent material comprises A, B and C, A, B and C are rare earth elements, A, B and C are different, the chemical formula of the luminescent material is (AxB1-x) 1-yVO4: Cy, x is more than or equal to 0.10 and less than or equal to 1.00, and y is more than or equal to 0.01 and less than or equal to 0.10; the invention can overcome the problems of general luminous intensity, poorer stability and shorter service life of the luminescent material.

The application discloses a mural reinforcing protective agent and a preparation method and application thereof, belongs to the technical field of cultural relic restoration, and can solve the technical problems that existing mural reinforcing materials cannot reinforce the lower layer structure of ancient murals and are prone to being attached to the surface of murals to cause the whitening of the surface pigments. The mural reinforcing protective agent comprises a bacterial cellulose carrier and Ba(OH)2 nanoparticles loaded on the bacterial cellulose carrier in situ. The application plays a reinforcing role on the lower layer structure of murals, realizes deep reinforcement of ancient murals, improves the protection effect, stability and durability, and the surface of the mural will not be whitened.

This invention relates to a method for modifying a methane combustion catalyst with Al2O3 and controlling Ce loading. The method comprises: dissolving cerium nitrate hexahydrate in deionized water with the same saturated adsorbed water volume as the pretreated Al2O3 support to obtain a cerium nitrate hexahydrate impregnation solution; uniformly adding the cerium nitrate hexahydrate impregnation solution dropwise onto the pretreated Al2O3 support powder to completely wet it; and then allowing it to stand, dry, and calcining to obtain a CeO2-Al2O3 catalyst support material; dissolving palladium nitrate in deionized water with the same saturated adsorbed water volume as the pretreated Al2O3 support to obtain a palladium nitrate impregnation solution; and adding the palladium nitrate impregnation solution dropwise onto the CeO2-Al2O3 catalyst support material to completely wet it; and then allowing it to stand, dry, and calcining to obtain a Pd-CeO2-Al2O3 catalyst.

This invention discloses a nano-haloysite-based electrolyte filling material and its preparation and application methods. The preparation method includes: mixing and grinding nano-haloysite with graphite; mixing the resulting halloysite-graphite mixture with saturated saline solution and polyacrylamide at low and high speeds, adjusting the pH of the resulting mixture to 6.5–7.5, and then subjecting it to ultrasonic treatment to obtain the electrolyte filling material. The electrolyte filling material obtained by this invention is a stable dispersion system. Compared with kaolinite fillers, its stability is significantly improved, and it does not exhibit stratification over a longer application period. The resulting electrode has a more stable potential difference.

The invention discloses a method for synthesizing a spinel type nano-micro material based on a subcritical technology, and the specific preparation method is as follows: putting a precursor solution, an additive and the like into a high-pressure reaction kettle for mixing, and preparing the spinel type nano-micro material by utilizing the characteristics of high diffusion coefficient, high reaction rate and low surface tension of subcritical water; uniform mixing and efficient reaction among reactants are promoted by a heating device (160-180 DEG C) and different reaction atmospheres (oxygen, helium or nitrogen), and the reaction is kept for 30-180 minutes, so that crystals are rapidly nucleated and nanoparticles are formed. Compared with a traditional spinel type nano-micro material synthesis method, the method has good safety, stability and controllability, and is a subcritical technical method for synthesizing the spinel type nano-micro material with a wide prospect.

According to the rapid preparation method, graphene oxide is used as a carbon source and a substrate, metal chloride is used as a raw material, and a Joule heating method is adopted to prepare the carbide ultrahigh-temperature ceramic nanoparticle-graphene composite material. Through short-time rapid high-temperature thermal shock, reduction of graphene oxide and rapid and uniform synthesis of carbide superhigh-temperature ceramic nanoparticles on graphene are synchronously realized. The synthesis process is simple and controllable, the preparation device is simple, the requirement on equipment is low, the industrial production cost can be reduced, and the preparation method is suitable for large-scale preparation of the carbide ceramic-graphene composite material, so that the carbide ceramic-graphene composite material can be more widely applied.

The application discloses a kind of aluminum alloy for selective laser melting forming and preparation method thereof, belong to aluminum alloy material and additive manufacturing technical field.The aluminum alloy of the present application comprises by mass percentage: Mg 3.8~5.2%, Zn 3.8~5.2%, Cu 0.5~1.0%, Ti 0.4~1.6%, C 0.1~0.4%, the balance is Al.Its preparation method includes: using Al-5Ti-1C intermediate alloy and other raw materials are melted into ingot, is atomized by vacuum, then it is printed by selective laser melting, finally it is solid solution and aging treatment.The application is introduced by Al-5Ti-1C intermediate alloy by component control and by submicron level TiC particle cooperates grain refinement, inhibits thermal crack, the yield strength of obtained alloy is greater than or equal to 480MPa, tensile strength is greater than or equal to 550MPa, elongation is greater than or equal to 10%, low in cost, suitable for additive manufacturing.

This invention belongs to the field of ultra-high molecular weight polyethylene (UHMWPE) fiber modification technology, specifically relating to a hydrocarbon-linked boron nitride-modified UHMWPE fiber with high creep resistance and its preparation method. The fiber comprises an UHMWPE matrix and hydrocarbon-linked grafted boron nitride dispersed therein; the hydrocarbon-linked grafted boron nitride is obtained by grafting ω-heptadecenylphosphonic acid onto the surface of hydroxylated nano-hexagonal boron nitride, exhibiting a dual physical crosslinking mechanism. The preparation method includes preparing hydroxylated nano-hexagonal boron nitride, preparing hydrocarbon-linked grafted boron nitride, and preparing high creep-resistant UHMWPE fiber. The method of this invention can significantly improve the creep resistance of the fiber, exhibiting mechanical stability, with a creep rate ≤1.5% after 1000 hours of stress loading at 200 MPa at room temperature. This invention features a simple process, strong adaptability, mild and controllable process parameters, low equipment modification costs, and is easy to industrialize.

The invention discloses a micron-sized spherical gold powder and a preparation method and application thereof, belonging to the technical field of metal powders. The invention adopts a two-step method to synthesize the gold powder. In the first step, a gold salt solution is adjusted to pH 7-9 and 3-5, and the mixture is mixed with a dispersant solution and a reducing agent solution to obtain a precursor solution. In the second step, the precursor solution is mixed with the gold salt solution, the pH is adjusted to 3-5, and the mixture is mixed with a dispersant solution and a reducing agent solution to obtain the micron-sized spherical gold powder. The gold powder has a suitable particle size, a spherical surface morphology, a uniform particle size distribution, a good dispersion, and no agglomeration. The gold powder is applied to the preparation of a conductive slurry, and the performance of the conductive slurry can be effectively improved.

The invention relates to the technical field of aluminum oxide modification, and specifically discloses a method for synthesizing modified aluminum oxide, which comprises the following steps: S1, dissolving a surfactant and a rare earth modifier 1 in a sodium aluminate aqueous solution to obtain a solution 1; S2, making the solution 1 flow in parallel with an aluminum sulfate aqueous solution to prepare a pseudo-boehmite slurry, stirring the pseudo-boehmite slurry, adding an organic solvent and then dripping a silane substance and continuing to stir, and finally adding lanthanum nitrate to react, filtering, washing, and drying after the reaction to obtain modified pseudo-boehmite powder; S3, calcining the modified pseudo-boehmite powder to obtain modified aluminum oxide; the synthetic method of the invention has simple steps and a short process flow, and can significantly shorten the preparation time while effectively improving the thermal stability of aluminum oxide.

The invention discloses a method for preparing spherical nano barium fluoride, spherical barium fluoride smaller than 5nm is synthesized by a microemulsion reaction method, and the microemulsion is temperature-responsive and does not contain a surfactant. Controllable preparation of the spherical barium fluoride with the ultra-small size smaller than 5 nm under the surfactant-free condition is achieved for the first time. A ternary surfactant-free microemulsion system composed of diethylene glycol monohexyl ether, octane and water is constructed, the amphiphilic solvent characteristic of diethylene glycol monohexyl ether is used for replacing a traditional surfactant, and the dependence of an existing template method on the surfactant is successfully broken through. The particle size of the obtained BaF2 product is only smaller than 5 nm and enters a strong quantum confinement scale range, and the preparation blank of a barium fluoride material in the field of sub-5-nm ultra-small solid spheres is filled.

The application provides a fire-retardant adhesive, a fire-retardant double-sided adhesive tape for bonding porous rough materials and a preparation method of the fire-retardant double-sided adhesive tape. The bonding layer of the fire-retardant double-sided adhesive tape is made of the fire-retardant adhesive. The fire-retardant adhesive comprises 100 parts of solvent type acrylate glue, 20-40 parts of a fire retardant, 2-6 parts of tackifying resin, 0.4-1 part of a curing crosslinking agent and 20-30 parts of a second solvent in terms of weight. The fire retardant comprises a liquid fire retardant and a solid fire retardant. The liquid fire retardant is an organic phosphorus-nitrogen ionic liquid fire retardant. The solid fire retardant is ammonium polyphosphate. The specific type of fire retardant is compounded with the solvent type acrylate glue, and the bonding performance of the adhesive tape is not affected. The synergistic fire-retardant mechanism of the condensed phase and the gas phase is realized, the adhesive layer has excellent fire-retardant performance, and the adhesive tape can be applied to bonding scenes such as automobile interior part assembly and electronic product cushion fixing.

The application discloses a preparation method of spherical alumina powder with good dispersity, and comprises the following steps: dissolving aluminum nitrate nonahydrate and ammonium sulfate in deionized water, adding sodium hydroxide, polysiloxane-polyester sulfonate dispersant and urea in sequence, stirring, and configuring into a reaction solution; then, the reaction solution is subjected to temperature increasing reaction under stirring at a certain temperature increasing rate; after the reaction is completed, the spherical alumina precursor is prepared through filtering, washing and drying treatment; finally, the prepared spherical alumina precursor is subjected to calcination according to a certain calcination process, and the spherical alumina is obtained after cooling. The spherical alumina prepared by the method has the advantages of smooth surface, good dispersity, controllable particle size (D50 is about 1-8 microns), easily obtained raw materials, simple process, low requirement on production equipment and easy industrialization.