12results about How to "Achieve densification" patented technology

The invention relates to the technical field of silicon carbide ceramics, in particular to an in-situ induced low-temperature eutectic silicon carbide porous ceramic and a preparation method thereof. The material is prepared by mixing and sintering the following materials: silicon carbide, a synergistic sintering system, a dispersing agent, a plasticizer and water, wherein the synergistic sintering system comprises the following components: pregelatinized starch, a silicate mineral material, aluminum oxide, calcium carbonate, glass powder and rare earth oxide; the pregelatinized starch is adopted as an adhesive, the thermal decomposition behavior of the pregelatinized starch and the chemical reaction activity of the glass powder and the calcium carbonate form synergy in the process, seamless connection of the whole process from the room temperature to the sintering temperature is achieved, the sintering temperature is greatly reduced, meanwhile, the glue discharging step is omitted, and the silicon carbide porous ceramic product with good performance and few defects is obtained.

The preparation method comprises the following steps: adding an alkaline reagent into a silver-containing leaching solution of a retired photovoltaic module to adjust the pH value to 3-5, carrying out solid-liquid separation after reaction to obtain an impurity-removed leaching solution, adding flake silver powder into the impurity-removed leaching solution, then adding a mixed solution of a dispersing agent and a reducing agent, and carrying out liquid-phase reduction reaction to obtain the micro-nano silver powder. And carrying out solid-liquid separation on the reacted slurry to obtain the micro-nano silver powder with lead on the surface. According to the preparation method provided by the invention, silver and lead in the retired photovoltaic silver-containing leaching solution can be effectively utilized, the micro-nano composite silver powder with high conductivity can be prepared in one step, and the preparation method is suitable for preparation of photovoltaic conductive silver paste and electronic packaging conductive silver paste.

A movable vibration and smoothing system for trestle bridge relates to the technical field of concrete vibration and smoothing, and comprises a walking trolley, a lifting device and a roller shaft type vibration and smoothing device. The walking trolley is installed on the top rail of a tunnel construction trolley, and the height of the roller shaft type vibration and smoothing device is adjusted through the integrated lifting device. The vibration and smoothing device comprises a distributing spiral shaft, a paving roller shaft, a smoothing walking roller shaft and an insert type vibrator, forming a multi-stage cooperative working mechanism. The three cooperative actions of the distributing spiral shaft, the paving roller shaft and the smoothing walking roller shaft improve the uniformity, compactness and surface flatness of concrete paving. The insert type vibrator is arranged between the distributing spiral shaft and the paving roller shaft, can immediately carry out deep layer high frequency vibration after preliminary paving of concrete, effectively removes internal bubbles and prevents quality defects. The auxiliary walking wheel ensures the consistency of the concrete surface flatness and the design elevation.

The invention discloses a low-porosity, low-iron and low-creep clay brick and a preparation method thereof, and relates to the technical field of refractory materials, and the low-porosity, low-iron and low-creep clay brick comprises the following components in parts by weight: 30-45 parts of a mullite homogenized material, 12-20 parts of Anhui flint clay, 8-10 parts of sillimanite, 15-25 parts of kaolin, 10-20 parts of andalusite powder, 3-5 parts of raw silicon powder, 2-5 parts of potassium feldspar powder and 0.2-0.5 part of hydroxypropyl methyl cellulose. And 3-6 parts of an aluminum dihydrogen phosphate solution. The high-quality clay brick with low porosity, low iron, low creep deformation and high strength is successfully prepared by optimizing the raw material ratio and a composite binding agent system, and the high-quality clay brick is suitable for high-temperature industrial kilns with harsh performance requirements.

This invention discloses a method for preparing high-strength, high-thermal-conductivity silicon carbide ceramics, relating to the field of advanced ceramic processing technology. The method includes the following steps: adding PEG to deionized water, then adding hydrophilically modified mesophase pitch-based carbon fibers and hydroxylated modified α-SiC, followed by adding monomers and crosslinking agents, and finally adding an initiator; stirring and pouring the mixture into a mold; heating and curing to obtain HTC. f - SiC green embryo; drying and degreasing; introducing carbon matrix using polymer impregnation pyrolysis process to obtain HTC. f A SiC-C intermediate is prepared by using a reactive melt infiltration process to infiltrate molten Si and react it with the carbon matrix, resulting in high-strength, high-thermal-conductivity silicon carbide ceramics. This invention significantly reduces the manufacturing cost of SiC ceramics, lowers equipment energy consumption, and improves the thermal conductivity, mechanical properties, and fracture toughness of SiC ceramics. This invention solves the problems of complex preparation processes and poor performance of silicon carbide ceramics in existing technologies.

The application discloses a strontium ferrite / polyether ether ketone composite magnet and a preparation method and application thereof, and belongs to the technical field of permanent magnet materials.The strontium ferrite / polyether ether ketone composite magnet comprises, in mass fraction, near Curie point magnetic field heat-treated strontium ferrite magnetic powder 84-95 parts, polyether ether ketone 5-15 parts, silane coupling agent 0.5-1.5 parts and lubricant 0.3-0.7 parts.The application adopts the above strontium ferrite / polyether ether ketone composite magnet and the preparation method and application thereof, realizes the synergistic improvement of magnetic performance, mechanical strength and heat resistance through intrinsic magnetic domain structure optimization, interface bonding strengthening and high densification structure design, and can meet the application requirements under the working conditions of high temperature, high reliability and high strength.

The invention discloses a preparation method of antioxidant compact compound tungsten carbide-based rare metal ceramic, and relates to the field of metal ceramic. Firstly, a silicon carbide substance is introduced through polycarbosilane, ceramic pores are filled with metal zirconium through a metal infiltration reaction, compactness is improved, and meanwhile the oxidation resistance of a ceramic matrix is enhanced; and then, a tungsten carbide enrichment layer is formed on the surface of the ceramic in a mode of combining ion injection infiltration and spraying, and the high-temperature and high-speed tungsten carbide and the metal adhesive are combined with the originally injected tungsten carbide enrichment layer into a whole during spraying. Secondly, high-proportion rare metal nano rhenium is adopted, and material surface densification of the tungsten carbide-based metal ceramic compound coating in a high-temperature environment is achieved; finally, through hydrogen reduction treatment, the oxygen content of the powder is further reduced, and the high-activity low-oxygen compound carbide rare metal ceramic with the nanocrystalline structure is produced. The ceramic prepared by the invention has the effects of oxidation resistance and compactness.

This invention discloses an in-situ nano-duplex reinforced Al-Zn-Mg-Cu-Y alloy. The chemical composition of the alloy, by mass percentage, comprises: Zn 4-8%, Mg 1.2-2.8%, Cu 1.2-2.0%, Y 0.1-0.6%, and Al 86.6-93.5%, with the total mass percentage of each chemical component being 100%. The alloy microstructure contains uniformly distributed nano-scale η-phase and nano-scale T-phase. This invention also discloses a high-pressure preparation method for the above-mentioned in-situ nano-duplex reinforced Al-Zn-Mg-Cu-Y alloy, comprising the following steps: subjecting the billet to high-temperature and high-pressure treatment to obtain the in-situ nano-duplex reinforced Al-Zn-Mg-Cu-Y alloy. This invention adds rare earth element Y and combines this with high-temperature and high-pressure treatment to form uniformly distributed nano-scale η-phase and nano-scale T-phase in-situ within the alloy microstructure.

The application provides a high-temperature brazing filler metal for silicon carbide-based ceramic connection and a preparation method and application thereof, and belongs to the technical field of silicon carbide ceramic materials. The high-temperature brazing filler metal for silicon carbide-based ceramic connection provided by the application comprises 2-15% of metal powder and the balance of Ti-Si powder in percentage by mass, wherein the metal powder comprises Fe powder, Al powder, Ni powder, Cr powder or Co powder. A small amount of metal elements is added in the Ti-Si brazing filler metal, so that the melting point of the brazing filler metal is reduced, the connection time is shortened, and the liquid brazing filler metal is promoted to generate the Ti3SiC2 MAX phase with high strength by in-situ reaction with the silicon carbide-based ceramic to connect the base material; meanwhile, the brazing filler metal is in a liquid state at high temperature, so that the densification of the weld is achieved without using pressure, and the mechanical properties of the connected parts at room temperature and high temperature are improved.

The application provides a kind of display film crystalline injection process method, belongs to thin film crystalline injection technical field, method includes: S1, preparation stress buffer and crystallization control adjuvant, its raw material includes vinyltriethoxysilane, polyether modified polysiloxane surfactant and propylene glycol methyl ether acetate etc.;S2, indium nitrate, gallium nitrate, zinc acetate and adjuvant are mixed, and preparation base composite precursor solution A;S3, solution A is spin-coated into film, and gradient drying and pre-solidification are carried out to obtain pre-solidification film;S4, the impregnation liquid B obtained by diluting with adjuvant is used to carry out liquid phase assisted impregnation on pre-solidification film, and low oxygen atmosphere is carried out in low temperature activation gradient annealing;S5, in inert atmosphere, carry out rapid thermal annealing;The application realizes high-quality crystallization of film at lower temperature by adjuvant and synergistic annealing process, reduces the internal stress of film, and the prepared display film has excellent electrical performance uniformity, high light transmittance and low residual stress.

The application relates to the field of functional materials and discloses a coordination polymer glass integrated MOF composite film, preparation and application. The composite film comprises a porous support substrate, a discontinuous MOF crystal layer grown on the surface of the support substrate, and a coordination polymer glass phase filled in intercrystalline gaps of the MOF. In the preparation, a discontinuous columnar arene-containing MOF layer is first grown in situ on the substrate, then low-melting coordination polymer crystals are deposited on the surface of the MOF layer, the coordination polymer crystals are infiltrated into the intercrystalline gaps by being melted through heating, and the coordination polymer crystals are converted into a dense and non-porous glass phase through rapid quenching. The application innovatively introduces a coordination polymer glass as a molecular adhesive, eliminates non-selective intercrystalline defects, retains intrinsic channels of the MOF, realizes high selectivity, high cycle stability and excellent electrochemical transmission flux of potassium, sodium and lithium ions, and has wide application prospects in the fields of lithium extraction from salt lakes and seawater desalination.

The application provides a preparation method and application of a microporous wood-based carbon electrode material, and belongs to the technical field of electrode materials. The method comprises the following steps: putting pretreated basswood and laccase into a buffer solution to obtain single-enzymatic wood chips; putting the single-enzymatic wood chips and hemicellulase into a buffer solution to obtain double-enzymatic wood chips; and putting the double-enzymatic wood chips into hot pressing and high-temperature carbonization to obtain the microporous wood-based carbon electrode material. The application adopts sequential and synergistic degradation of laccase and hemicellulase to accurately and greenly remove lignin and hemicellulose, and then combines with stepwise high-pressure hot pressing densification and inert atmosphere carbonization to realize high enrichment of 0.5-1.0 nm micropores in the bulk wood-based carbon material, optimization of pore connectivity and structure without cracking and deformation. The method is free of toxic reagents and waste liquid discharge, is easy to scale up, significantly improves the conductivity and specific surface area of the material, and guarantees the product qualification rate and performance stability.