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Ultrafast laser welding method and device for large-spacing heterogeneous materials
ActiveCN119260171AImprove stabilityincrease contact interfaceLaser beam welding apparatusLight spotGalvanometer
The invention provides an ultrafast laser welding method and device for large-spacing heterogeneous materials. The ultrafast laser welding method specifically comprises the steps that a lower workpiece and an upper workpiece are stacked and clamped through a clamp; a laser beam is collimated, then enters a scanning galvanometer and is focused through a field lens after being emitted, first scanning laser energy is absorbed by a lower-layer material to generate plasma, the plasma continuously expands and overflows, meanwhile, the lower-layer material is melted to fill a gap, and the quasi-optical contact condition is achieved; free expansion of plasmas in second scanning is effectively inhibited, laser energy is limited near a welding seam, the melting volume of the area is remarkably increased, and the welding strength is remarkably improved; and the third scanning and the second scanning are consistent in mechanism, the material melting amount is increased, and finally welding head strengthening is achieved. Through the scanning galvanometer and the field lens, a focusing light spot moves along a specified route in the contact surface of the upper and lower workpieces, so that the workpieces are melted and combined. After three times of scanning, the large-spacing heterogeneous material can finally obtain a high-strength and high-quality welding joint.
Owner:CENT SOUTH UNIV
Transparent material / metal heterogeneous material ultrafast laser welding method based on burst mode
PendingCN119115205AEfficient integrationIncrease the number ofLaser beam welding apparatusLaser processingLap joint
The invention discloses a transparent material / metal dissimilar material ultrafast laser welding method based on a burst mode, and belongs to the technical field of laser micro-nano machining, and the transparent material / metal dissimilar material ultrafast laser welding method comprises the steps that the surface roughness and flatness of a pre-welded piece are treated through a mirror grinding and polishing technology, so that a sample piece reaches the optical contact condition, the pre-welded piece is in lap joint with a tool platform through a specially-made clamp, and the pre-welded piece is welded to the tool platform; when a visual Newton ring appears on a contact surface and an ultrafast laser focus is located at a material interface, using a burst mode under an ultrafast laser processing platform to increase the number of sub-pulses, welding a micro-area, equally dividing the energy of a single pulse into a plurality of pulses, and then emitting light in a pulse sequence mode, by using the burst mode containing multiple pulses, the heat accumulation effect can be achieved more easily, the ablation efficiency and the connection strength and stability of the transparent material and the metal heterogeneous material are improved while the machining rate is increased, and the method has wide application prospects.
Owner:SHANGHAI UNIV OF ENG SCI +1
Active brazing filler metal for sealing sapphire and kovar alloy and preparation method of active brazing filler metal
PendingCN119426846Aimprove matchavoid crackingWelding/cutting media/materialsSoldering mediaRare-earth elementVacuum pressure
The invention discloses active brazing filler metal for sealing sapphire and kovar alloy and a preparation method of the active brazing filler metal. The active brazing filler metal comprises 25.0 wt%-27.5 wt% of Cu, 1.0 wt%-6.0 wt% of Ti, 1.0 wt%-5.0 wt% of Al, 0.1 wt%-1.0 wt% of B, 0.1 wt%-0.5 wt% of rare earth element RE, RE is one or more of La, Ce, Sc, Pr, Nd and Er, and the balance is Ag. The preparation method comprises the following steps: preparing silver-based pre-alloying powder by adopting a gas atomization method, mixing the alloy powder with additive element powder in a ball milling manner, sintering by utilizing vacuum pressure to obtain an alloy ingot blank, and carrying out rough rolling, intermediate annealing and finish rolling to obtain an active brazing filler metal strip with the thickness of 0.05-0.2 mm. The active brazing filler metal is well matched with the thermal expansion coefficient of sapphire, direct brazing of sapphire and Kovar alloy can be achieved, the brazing temperature is moderate, and a brazed joint is uniform in structure and free of defects such as air holes and cracks.
Owner:BEIJING INST OF NONFERROUS METALS & RARE EARTH
Epoxy resin conductive adhesive doped with conductive nanoparticles as well as preparation method and application of epoxy resin conductive adhesive
InactiveCN119119934AImprove conductivityIncreased shear strengthMaterial nanotechnologySemiconductor/solid-state device detailsEpoxyPolymer science
The invention is applicable to the technical field of conductive adhesives, and provides a conductive nanoparticle-doped epoxy resin conductive adhesive which comprises the following raw materials in parts by weight: 0.05-4 parts of conductive metal nanoparticles, 0.03-6 parts of conductive polymer nanoparticles, 45-80 parts of modified flaky silver-coated copper powder, 10-50 parts of epoxy resin, 10-30 parts of a curing agent, 0.001-1 part of an accelerant and 0.2-0.6 part of a modifier. The invention further provides a preparation method of the epoxy resin conductive adhesive doped with the conductive nanoparticles. The invention also provides application of the epoxy resin conductive adhesive doped with the conductive nanoparticles in preparation of a semiconductor packaging material. The conductive metal nanoparticles and the conductive polymer nanoparticles are introduced into the formula of the conductive adhesive in a doping manner, the usage amount of the micron silver coated copper powder can be reduced on the premise of ensuring that the conductive adhesive has good conductivity, and the preparation method is convenient to operate, simple and easy to implement and low in raw material price.
Owner:ANHUI UNIV
Anchoring device for geological disaster control
ActiveCN222349680UIncreased shear strengthImprove skid resistanceExcavationsReceptacle cultivationRubber ringSoil science
The utility model belongs to the technical field of geological disaster control, and discloses an anchoring device for geological disaster control. Comprising an anchoring pipe, a flowerpot, a rubber ring, a supporting rod and an inserting rod, vent holes are formed in the outer side of the flowerpot in an array mode, a mounting hole is formed in the bottom of the flowerpot, a filtering cover is mounted in the mounting hole, and the bottom of the filtering cover is attached to the anchoring pipe and the top of a mounting ring. The screw rod, the rotating ring, the transmission rod and the supporting rod are additionally arranged, the supporting rod is unfolded when the screw rod rotates, the anti-skid and anti-falling effects of the anchoring pipe are improved, the flowerpot and the anchoring pipe are fixed through the bolt, flowerpots of different sizes can be replaced according to plants of different thicknesses, the bolt is covered with the rubber ring, the bolt can be prevented from rusting, and the service life of the flowerpot is prolonged. The filter cover and the rotary drum are added, and when the water level of underground water rises, the underground water seeps through the filter screen of the rotary drum and the filter cover, so that the water content of slope soil is reduced, the shear strength of the soil body is improved, and the slope stability is further improved.
Owner:HUNAN TIANJILING CONSTR ENG CO LTD
Anti-shearing fiber metal laminate and preparation method thereof
ActiveCN119590045AIntegrity guaranteedensure safetyLamination ancillary operationsNon-macromolecular adhesive additivesPolymer scienceCarbon fibers
The invention belongs to the technical field of fiber metal laminates, and particularly discloses an anti-shearing fiber metal laminate and a preparation method thereof. A stainless steel ultra-thin belt, carbon fiber woven cloth and one-way carbon fiber prepreg are laid according to a laying scheme of [W / [G / 0 / G / 90] 2 / Gc] s, modified epoxy resin is coated between every two layers in the laying process, and the anti-shearing fiber metal laminate is obtained after curing; wherein W represents the carbon fiber woven cloth, G represents the stainless steel ultra-thin strip, 0 represents the unidirectional carbon fiber prepreg laid at 0 degree, 90 represents the unidirectional carbon fiber prepreg laid at 90 degrees, Gc represents the central layer, s represents the symmetrical laying layers along the central layer, and 2 represents the repetition frequency of [G / 0 / G / 90]. According to the prepared anti-shearing fiber metal laminate, the anti-shearing performance of the fiber metal laminate is greatly improved, and the possibility of damage such as layering damage, matrix fracture, fiber fracture and metal plastic deformation is reduced.
Owner:TAIYUAN UNIVERSITY OF TECHNOLOGY
Composite reinforcement type suction barrel device based on microbial induction and use method of composite reinforcement type suction barrel device
PendingCN119507466AImprove stabilityImprove carrying capacityFoundation testingSoil preservationMicroorganismSuction force
The invention discloses a composite reinforcement type suction barrel device based on microorganism induction and a use method thereof. The composite reinforcement type suction barrel device based on microorganism induction comprises a suction barrel model system, a microorganism cement reinforcement system and a test monitoring system. The suction cylinder model system comprises a suction cylinder, a grouting pipeline and hydraulic equipment, and the grouting pipeline is laid on the inner wall of the suction cylinder and used for injecting microorganism cement grout; the hydraulic equipment is connected to the suction barrel and used for controlling lifting and pressing-in of the suction barrel. The microbial cement reinforcement system comprises liquid storage equipment and negative pressure equipment, and the liquid storage equipment is connected to the grouting pipeline and used for storing and providing microbial cement grout for the grouting pipeline; the negative pressure equipment is connected to the suction barrel and used for applying negative pressure to the interior of the suction barrel in the grouting process, and permeation of microorganism cement grout is promoted. The test monitoring system is used for testing mechanical parameters of a soil body, monitoring the suction barrel and carrying out a loading test on the suction barrel.
Owner:TSINGHUA SHENZHEN INTERNATIONAL GRADUATE SCHOOL
Anti-crack asphalt concrete material and preparation method thereof
ActiveCN119661123AGood dispersiongood heat insulationSolid waste managementLignin derivativesCrack resistanceHydrotalcite
The invention relates to the technical field of asphalt concrete, and discloses an anti-crack asphalt concrete material and a preparation method thereof. According to the asphalt concrete material disclosed by the invention, by adding the reinforcing filler and the composite aerogel, the crack resistance, the service life and the ultraviolet aging resistance of a matrix are remarkably improved; wherein the reinforcing filler is based on the synergistic effect among modified lignin, diatomite and hydrotalcite, the compatibility among modified lignin, diatomite and hydrotalcite is improved by utilizing a silane coupling agent, and the dispersity of the reinforcing filler in a matrix is improved, so that the crack resistance of the matrix is improved, the service life of the matrix is prolonged, and the ultraviolet resistance of the matrix is improved; the composite aerogel has excellent heat insulation performance and a three-dimensional network structure, and the crack resistance of the matrix can be improved through the synergistic effect.
Owner:NINGBO DONGXING ASPHALT PROD CO LTD
Zn-Al series brazing material for aluminum-copper welding and preparation method and application of Zn-Al series brazing material
PendingCN119077213AEasy to prepareeasy to operateWelding/cutting media/materialsSoldering mediaChemical compositionIngot
The invention discloses a Zn-Al series brazing material for aluminum-copper welding and a preparation method and application of the Zn-Al series brazing material, and belongs to the technical field of brazing materials. The brazing material comprises the following chemical components in percentage by weight: 9%-25% of Al, 1%-5% of Ag, 1%-4% of Cu, 1%-4.5% of Si, 0.003%-1% of Mg, 0.05%-1% of Sr, 0.05%-1% of Ti, 0.05%-1.5% of Ni, 0.02%-0.15% of Sc and the balance of Zn. The Zn-Al series brazing material is used for brazing welding of Al and Cu, and a welded joint with high shear strength and high corrosion resistance can be obtained. The preparation method comprises the steps that raw materials prepared according to the preset chemical composition of the brazing material are subjected to vacuum melting and pouring, and an alloy ingot is obtained; and the alloy cast ingot is subjected to double-roller rapid solidification. The method is simple, easy to operate and suitable for industrial production.
Owner:CHINA-UKRAINE INST OF WELDING GUANGDONG ACAD OF SCI
Electroinduced viscosity-reducing glue as well as preparation method and application thereof
InactiveCN119432236AHigh peel strengthIncreased shear strengthNon-macromolecular adhesive additivesMacromolecular adhesive additivesAdhesive cementPolymer science
The invention relates to the technical field of adhesives, and particularly discloses an electrogenerated viscosity-reducing adhesive as well as a preparation method and application thereof. The electrogenerated viscosity-reducing glue is prepared from the following raw materials in parts by weight: 100 to 150 parts of polyacrylate, 30 to 50 parts of polyvinyl alcohol, 20 to 40 parts of functional monomer, 1 to 5 parts of conductive agent, 2 to 6 parts of alkenyl-containing ionic liquid, 1 to 5 parts of lithium salt, 1 to 5 parts of tackifier, 1 to 2 parts of dispersant, 0.1 to 2 parts of initiator and 60 to 100 parts of organic solvent, and the conductive agent is obtained by synergistically modifying hydroxylated carbon nanotubes with 2-thiophenecarboxylic acid and 2-picolinic acid. The electrogenerated viscosity-reducing adhesive is applied to the electrogenerated viscosity-reducing adhesive tape, and the obtained adhesive tape is excellent in peel strength and shear strength, high in power-on viscosity-reducing efficiency, free of adhesive residue during peeling, reusable and wide in application prospect.
Owner:KUNSHAN BYE MACROMOLECULE MATERIAL CO LTD
Fine sand foundation reinforcing structure for laying municipal pipelines and construction method of fine sand foundation reinforcing structure
PendingCN119411624AIncreased shear strengthImprove carrying capacityClimate change adaptationBulkheads/pilesSpiral bladeArchitectural engineering
Owner:BEIJING MUNICIPAL SEVENTH CONSTR ENG CO LTD +1
Hot melt adhesive, preparation method thereof and application of hot melt adhesive in card protecting film
ActiveCN119463742AGood toughening effectImprove adhesionNon-macromolecular adhesive additivesPolyureas/polyurethane adhesivesPolymer scienceAntioxidant
The invention relates to the technical field of EVA (Ethylene Vinyl Acetate) hot melt adhesives, and discloses a hot melt adhesive, a preparation method thereof and an application of the hot melt adhesive in a card protecting film. The preparation method comprises the following steps: adding EVA resin, EVA-based polyurethane and an antioxidant into a reaction kettle, heating, stirring and melting, then adding a plasticizer, an auxiliary agent and a tackifier, and cooling to obtain the hot melt adhesive. The EVA-based polyurethane contains an EVA molecular chain, so that the polyurethane and EVA resin have better compatibility, a better toughening effect is achieved, the shear strength and the elongation at break of the hot melt adhesive are improved, the EVA-based polyurethane contains a hydrophobic fluorine-containing alkyl chain, the hydrophobicity of the polyurethane is improved, the hydrophobicity of the hot melt adhesive is improved, and the hot melt adhesive has a good application prospect. The water absorption rate is reduced, and better water resistance is shown. Good practical application is realized in the aspects of card protecting films and the like.
Owner:HUIZHOU YIDU STATIONERY SUPPLIES CO LTD
Reinforcing structure of soft soil foundation road and construction method thereof
InactiveCN119411436Aimprove integrityImprove water stabilityRoadwaysBulkheads/pilesSoil scienceSoil mixing
The invention belongs to the technical field of soft soil foundation treatment, and discloses a soft soil foundation road reinforcing structure and a construction method thereof.The reinforcing structure comprises a plurality of cement soil mixing piles arranged in a soft soil foundation in an array mode; the multiple core piles are used for being inserted into the cement-soil mixing pile before initial setting of the cement-soil mixing pile, the multiple core piles and the multiple cement-soil mixing piles are arranged in a one-to-one correspondence mode, and each core pile comprises a pipe pile and a reinforcing piece which is filled and fixed in the pipe pile; the geogrid layer is laid on the top of the soft soil foundation and located above the multiple core pile areas, and a plurality of meshes are formed in the geogrid layer; a mattress layer; and a filler. The integrality, water stability and certain strength of the road soft soil foundation can be effectively improved, the bearing capacity and shear strength of the road subgrade are remarkably improved, meanwhile, differential settlement of the road subgrade can be effectively controlled by reinforcing the soft soil layer, and the construction quality is improved.
Owner:CHINA CONSTR EIGHT ENG DIV CORP LTD
Emulsifying device for preparing defoaming agent
ActiveCN119345963Areduce areaavoid accumulationMixing methodsRotary stirring mixersProcess engineeringDefoaming Agents
The invention relates to an emulsifying and mixing device, in particular to an emulsifying device for preparing a defoaming agent. The technical problems that according to an existing emulsifying device, the shearing force of stirring equipment is inconvenient to adjust according to the state of raw materials, granular raw materials are prone to being accumulated on mixing blades, materials on the inner side wall of an emulsifying barrel are inconvenient to scrape off, and then the mixing and emulsifying effect is poor are solved. The emulsifying device for preparing the defoaming agent comprises a bottom frame, a fixing ring, an emulsifying barrel and the like, a fixing ring is mounted on the bottom frame, and an emulsifying barrel is mounted on the fixing ring. When raw materials are primarily mixed, the angles of the mixing blades are approximately parallel to the surfaces of the raw materials, so that the shearing force can be reduced, the raw materials can penetrate through the fixing holes, the area of the surfaces of the mixing blades directly impacted by the raw materials can be reduced, the shearing force is further reduced, and meanwhile, accumulation of the raw materials on the mixing blades is avoided; raw material deposition on the mixing blades is reduced, and uneven stirring caused by the fact that granular raw materials are attached to the mixing blades is avoided.
Owner:HANGZHOU SERAPH TECH CO LTD
Low-hygroscopicity medium-temperature curing single-component epoxy adhesive suitable for bonding special-shaped structure composite material and preparation method of low-hygroscopicity medium-temperature curing single-component epoxy adhesive
PendingCN119529728AImprove toughnessIncreased shear strengthNon-macromolecular adhesive additivesMacromolecular adhesive additivesAdhesive cementPolymer science
The invention relates to an epoxy adhesive and a preparation method thereof, in particular to a low-hygroscopicity medium-temperature curing single-component epoxy adhesive suitable for bonding special-shaped structure composite materials and a preparation method of the low-hygroscopicity medium-temperature curing single-component epoxy adhesive. The invention aims to solve the problems of poor flowability resistance and wet resistance of the medium-temperature curing dicyandiamide system single-component epoxy adhesive for bonding special-shaped composite structures. The invention relates to a low-hygroscopicity medium-temperature curing single-component epoxy adhesive suitable for bonding special-shaped structure composite materials. The epoxy resin is prepared from the following components in parts by mass: 70 to 90 parts of bisphenol A epoxy resin, 10 to 30 parts of multifunctional epoxy resin, 10 to 30 parts of core-shell toughened epoxy resin, 10 to 20 parts of polysulfide rubber modified resin, 8 to 12 parts of dicyandiamide, 1 to 2 parts of 2-ethyl-4-methylimidazole and 7 to 9 parts of fumed silica. The polysulfide rubber modified resin disclosed by the invention has a good toughening effect in the epoxy resin adhesive, the shear strength can be improved, and the moisture resistance can be remarkably improved.
Owner:INST OF PETROCHEM HEILONGJIANG ACADEMY OF SCI
Method for modifying red clay by straw fiber composite ecological cement and application thereof
PendingCN119409462AIncreased shear strengthImprove permeabilitySowingCoastlines protectionFiberEnvironmental resource management
The invention discloses a method for modifying red clay by straw fiber composite ecological cement and application thereof. The straw fiber composite ecological cement modified red clay is prepared from air-dried red clay, ecological cement, straw fiber and water. The method comprises the following steps: a, obtaining straw fiber, ecological cement and red clay raw materials; b, testing to obtain the optimal moisture content, specific gravity and liquid-plastic limit index of the red clay; c, setting a plurality of orthogonal test proportions; d, matching the proportioned dry materials, adding a proper amount of water, braising the materials for 24 hours, uniformly stirring one part of the materials to prepare a standard cutting ring sample, and uniformly stirring the other part of the materials for a planting test; and e, performing a direct shear test, a penetration test, a fracture analysis test, a soil-water characteristic curve test and a plant growth test on the cutting ring sample after the dry-wet cycle. According to the method, the shear strength, permeability resistance and water stability of the red clay can be improved, deformation and crack development of the red clay are effectively prevented, and the modified red clay obtained through the method can be applied to channel slope construction.
Owner:GUANGXI UNIV
Method for preparing metal casting mold based on steel grit 3D printing
The invention discloses a method for preparing a metal casting mold based on steel grit 3D printing, and belongs to the technical field of metal casting mold machining. In order to solve the technical problem that in the prior art, the mechanical strength and collapsibility of a metal casting mold need to be further improved, the method for preparing the metal casting mold based on steel grit 3D printing comprises the following steps that a sand mold three-dimensional model is established according to a metal casting, then casting mold steel grit is filled in an operation box of sand mold 3D printing equipment, and the casting mold steel grit is obtained; the binder storage tank is filled with a binder; and according to the section formation of the sand mold three-dimensional model, a sand paving system of the sand mold 3D printing equipment paves cast steel sand on a printing platform. The casting steel sand and the binder are matched with each other, the metal casting mold blank is prepared through 3D printing and then dried, the normal-temperature mechanical property and high-temperature property of the metal casting mold are effectively improved, the application range of the metal casting mold is widened, and meanwhile the collapsibility of the metal casting mold is improved.
Owner:SHENYANG AIKESIBON IND MATERIALS CO LTD
A blue film tape for new energy vehicle battery and preparation method thereof
ActiveCN118931398Bgood adhesionHigh peel strengthNon-macromolecular adhesive additivesPolyureas/polyurethane adhesivesPolyesterAutomotive battery
The present invention relates to the technical field of adhesive tapes, and specifically discloses a blue film adhesive tape for new energy vehicle batteries and a preparation method thereof. A blue film adhesive tape for new energy vehicle batteries comprises a three-layer structure, wherein the outer layer is a PET release film with a thickness of 45-55 μm; the middle layer is a UV enhancement layer with a thickness of 50-60 μm; the inner layer is a blue PVC substrate film with a thickness of 45-55 μm; the UV enhancement layer comprises the following raw materials in parts by weight: 100-200 parts of polyacrylate, 30-60 parts of polyester, 20-40 parts of polyurethane, 20-50 parts of ethylene-vinyl acetate copolymer, 10-40 parts of photoreactive composition, 5-10 parts of photocatalyst, 20-40 parts of curing agent, 5-20 parts of filler, 1-3 parts of anti-aging agent, and 1-10 parts of tackifier; the obtained blue film adhesive tape has significant bonding performance, high peel strength and shear strength, and has broad market prospects.
Owner:KUNSHAN BYE MACROMOLECULE MATERIAL CO LTD
Method for enhancing interconnection of flip packaging electronic device
PendingCN119108341AIncreased shear strengthSemiconductor/solid-state device manufacturingSolderingUltrasound assisted
The invention discloses a method for enhancing interconnection of flip-chip packaging electronic devices, which comprises the following steps of: (a) adopting braided nickel as a support piece of the flip-chip packaging electronic devices, soaking the surface of the braided nickel in a solution of 5% sulfuric acid and 95% ethanol for 10 seconds, performing ultrasonic treatment on the surface of the braided nickel in an ethanol solution for 10 seconds, and drying the surface of the braided nickel; (b) immersing the woven nickel into the soldering flux; (c) immersing the woven nickel into the molten low-temperature metal, so that pores in the woven nickel are fully filled with the molten low-temperature metal; and (d) carrying out ultrasonic-assisted thermocompression bonding on the treated woven nickel to enhance the interconnectivity of the flip-chip packaging electronic device.
Owner:XIAMEN UNIV OF TECH
High-strength composite modified emulsified asphalt material as well as preparation method and application thereof
PendingCN119592087AHigh compressive strengthIncreased shear strengthIn situ pavingsPaving detailsEpoxyCompressive resistance
The invention relates to the technical field of road materials, in particular to a high-strength composite modified emulsified asphalt material as well as a preparation method and application thereof. According to the high-strength composite modified emulsified asphalt material provided by the invention, a three-dimensional cross-linked network is formed through the cross-linking reaction of the waterborne epoxy resin and the emulsified asphalt, and the addition of the alkaline silica sol further refines the particles of the emulsified asphalt, enhances the interaction among the particles and consolidates the strength of an asphalt matrix; therefore, the emulsified asphalt has remarkable binding power and stability, and shows higher compressive strength and shear strength after being cured. Meanwhile, the micro porosity of the emulsified asphalt is optimized, the permeability of moisture is reduced, the waterproof performance is enhanced, the high temperature resistance and low temperature resistance are improved, and when the emulsified asphalt is applied to a micro-surfacing mixture, the shear strength, durability, binding force with aggregate and water damage resistance of the micro-surfacing mixture are remarkably improved.
Owner:KZJ NEW MATERIALS GROUP CO LTD
Nano-copper metal material for low-temperature sintering conductive paste and preparation and application of paste of nano-copper metal material
PendingCN119418979Alower sintering temperatureimprove performanceSemiconductor/solid-state device manufacturingNon-conductive material with dispersed conductive materialConductive pasteMetallic materials
The invention belongs to the field of electronic packaging, and relates to a nano-copper metal material for low-temperature sintering conductive paste and preparation and application of the paste of the nano-copper metal material. The nano-copper metal material comprises copper nanoparticles and copper nanowires, and the copper nanoparticles and the copper nanowires are both prepared through a one-step hydrothermal method: (1) the copper nanoparticles are prepared, specifically, the high-purity copper nanoparticles are obtained through a hydrothermal reaction by adjusting the pH value; (2) preparing a copper nanowire: carrying out hydrothermal reaction on a copper source, a reducing agent and an end-capping reagent, so that copper ions are reduced into quintuple twin crystal seeds in one step and further directionally deposited into the copper nanowire; and (3) preparing conductive paste: mixing the nano-copper material and an organic reagent according to a certain proportion, and homogenizing to obtain the low-temperature sintering type conductive copper paste. The low-temperature copper paste is used for preparing the low-temperature copper paste for bonding a chip and a substrate. The prepared nano-copper metal material for the low-temperature sintering conductive paste is stable in size and simple in preparation process, and the prepared paste is good and excellent in sintering performance (the shear strength is 25 MPa, and the thermal conductivity is 4 W / m.K).
Owner:EAST CHINA UNIV OF SCI & TECH
Finite element simulation method for enhancing metal and composite material interface bonding performance through micron protrusion structure
PendingCN119249823Asolve the damageImprove mechanical propertiesSustainable transportationDesign optimisation/simulationElement modelPerformance index
The invention provides a finite element simulation method for enhancing metal and composite material interface bonding performance through a micron protrusion structure, and relates to the field of metal and composite material interface toughening, and the method specifically comprises the steps that the micron protrusion structure is constructed on the metal surface, and different metal layers and adhesive film materials are selected to form a complementary structure; aBAQUS software is used for establishing an initial finite element model and a simplified single-row micron convex interface unit strip model; according to the method, under the same constraint and boundary conditions, single-lap tensile shear simulation is carried out, the interface energy density, the equivalent elastic modulus and the interface shear strength are calculated, and finally, the three performance indexes are fused to generate a comprehensive evaluation index so as to evaluate and optimize the interface bonding performance. According to the method, the mechanical locking effect and the interface bonding strength of the interface are improved by introducing the micron bulge structure, in addition, the calculation process is simplified by establishing the equivalent single-row micron bulge interface unit strip model, and the simulation efficiency and precision are improved.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Construction method of large-area foundation pit support
InactiveCN119593411AEasy constructionGuaranteed stabilityExcavationsBulkheads/pilesShotcreteSoil nailing
The invention relates to the technical field of foundation pit supporting, and discloses a large-area foundation pit supporting construction method.A reinforcing mesh is arranged on a slope on one side of a drainage ditch on the ground, soil nails are arranged on the reinforcing mesh, the reinforcing mesh is fixed through the soil nails, a concrete layer is sprayed to form shotcrete-anchor supporting, and a waterproof curtain is arranged on the surface of the lower end of the reinforcing mesh; row piles are arranged on the inner side of the waterproof curtain and adopt cast-in-situ bored piles as foundation pit fender posts, a soil body below a foundation pit excavation face on the inner sides of the cast-in-situ bored piles is reinforced to achieve passive area soil body reinforcement, a top beam is arranged at the upper ends of the cast-in-situ bored piles, a reinforcing pier is arranged on the inner side of the top beam, and a steel lattice inclined pile is arranged on the side, away from the top beam, of the reinforcing pier. According to the construction method of the large-area foundation pit support, after the steel lattice inclined piles are put down, the reinforcing pier construction reinforcing bars and the steel lattice columns at the tops of the steel lattice inclined piles are firmly fixed, and the top beams and the reinforcing piers are poured, so that the top beams, the reinforcing piers and the steel lattice inclined piles form an integral structure.
Owner:SDC WATERWAY CONSTR
Single-component silane modified polyether sealant as well as preparation method and application thereof
ActiveCN119432290Afast curingshorten drying timeNon-macromolecular adhesive additivesMacromolecular adhesive additivesPolymer sciencePtru catalyst
The invention provides a single-component silane modified polyether sealant as well as a preparation method and application thereof. The single-component silane modified polyether sealant is prepared from the following raw materials in parts by weight: 280 to 300 parts of silane modified polyether resin, 100 to 130 parts of environment-friendly plasticizer, 500 to 550 parts of nano calcium carbonate, 10 to 30 parts of fumed silica, 3 to 5 parts of ultraviolet light absorber, 3 to 5 parts of light stabilizer, 3 to 5 parts of antioxidant, 15 to 20 parts of dewatering agent, 15 to 25 parts of silane coupling agent and 3 to 5 parts of catalyst. The single-component silane modified polyether sealant provided by the invention has excellent bonding performance to a metal substrate, has high hardness, high tensile strength, high elongation at break and high shear strength, is moderate in viscosity, is beneficial to conventional process construction, and has excellent comprehensive performance.
Owner:HANGZHOU ZHIJIANG SILICONE CHEM +1
Forming method of heat-proof layer with special-shaped structure
ActiveCN119489574AGood connectivity between layersReduce the risk of stratification failureWeight reductionDomestic articlesMechanical engineeringPhysics
The invention discloses a special-shaped structure heat-proof layer forming method, and belongs to the technical field of composite material forming. The forming method of the heat-proof layer with the special-shaped structure comprises the following steps: preparing an edge heat-proof layer blank body; prepreg is prepared, and the prepreg is laid on a sewing tool layer by layer; a plurality of layers of the prepreg close to the outer molded surface are sewn in a penetrating mode and jointed, the jointed follows the hole position of the penetrating sewing, and a large-area heat-proof layer laying layer set is obtained; embedding the edge heat-proof layer blank into the large-area heat-proof layer laying layer group to obtain a heat-proof layer blank; and carrying out pre-pressing and curing treatment on the heat-proof layer blank body to obtain the heat-proof layer with the special-shaped structure.
Owner:HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
Fiber reinforced industrial waste residue-based curing agent as well as preparation method and application thereof
The invention provides a fiber reinforced industrial waste residue based curing agent, which relates to the technical field of curing agents, and comprises the following components by weight: 5-12% of fly ash, 4-7% of blast furnace slag, 2-5% of steel slag powder, 3-8% of water glass, and 0.2-0.6% of palm fiber. The invention also provides a preparation method and application of the fiber-reinforced industrial waste residue-based curing agent. Industrial waste residues (fly ash, steel slag powder and the like are mixed according to a certain proportion) are utilized, the physical and mechanical properties of soft soil are improved through an alkali (water glass) excitation reaction, meanwhile, a certain amount of plant fibers (palm fibers) with a certain length are doped into the mixed soil, and the unconfined compressive strength and the splitting tensile strength of the soil can be enhanced.
Owner:THE THIRD CONSTR OF CHINA CONSTR EIGHTH ENG BUREAU +1
1500MPa-grade ultrahigh-strength titanium alloy fastener
The invention discloses a 1500MPa-grade ultrahigh-strength titanium alloy fastener which is obtained by sequentially performing heat treatment, head upsetting and thread rolling forming on ultrahigh-strength titanium alloy, and the ultrahigh-strength titanium alloy comprises the following elements in percentage by mass: 5-6% of Al, 3-4% of Mo, 3-4% of V, 5-6% of Cr, 1-2% of Nb, 2-3% of Zr, not more than 0.5% of Fe and the balance of Ti and inevitable impurities. According to the titanium alloy fastener, it can be guaranteed that the titanium alloy obtains high strength by adding the high Cr element, meanwhile, the machinability of the titanium alloy material is improved by adding the proper content of Mo and Nb elements, forming of the ultrahigh-strength titanium alloy fastener is facilitated, and the titanium alloy fastener is suitable for the technical field of titanium alloy fasteners.
Owner:NORTHWEST INSTITUTE FOR NONFERROUS METAL RESEARCH +1
Solid-waste-based multifunctional tailing asphalt pavement material and preparation method thereof
The invention discloses a solid waste-based multifunctional tailing asphalt pavement material and a preparation method thereof, and the pavement material comprises the following components in parts by mass: 4.5-5.5 parts of polyurethane modified asphalt, 45-60 parts of titanate modified iron tailings, 2-5 parts of surface activated copper tailing powder, 20-35 parts of copper tailing sand and 0.5-1.0 part of acetic anhydride modified wollastonite fiber. The high and low temperature performance, the durability and the self-healing performance of the asphalt mixture are comprehensively improved by modifying the solid waste tailing material and the asphalt, and the application range of the asphalt mixture is effectively widened.
Owner:NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
Rosin type soldering flux for indium-based low-temperature soldering paste and preparation method of rosin type soldering flux
PendingCN119566621Areduce liquidityImprove anti-collapse performanceWelding/cutting media/materialsSoldering mediaIndiumActive agent
The invention discloses rosin type soldering flux for indium-based low-temperature soldering paste and a preparation method of the rosin type soldering flux, and belongs to the technical field of brazing soldering flux. The soldering flux is prepared from the following components in percentage by weight: 40 to 60 percent of modified rosin, 2 to 5 percent of an organic acid activating agent, 0.5 to 2 percent of a halogen-containing compound, 2 to 5 percent of hydrogenated castor oil, 0.1 to 1 percent of benzotriazole, 0.1 to 1 percent of triethanolamine, 0.5 to 2 percent of a surfactant and 0.5 to 2 percent of paraffin oil. And the balance of an organic solvent. The method has the advantages that the prepared soldering flux is good in wettability and excellent in weldability, welding spots are bright and full, the welding void rate is as low as 2.4%, the heat conductivity can reach 43.12 W / mK, the welding spot shear strength can reach 13.45 MPa, and the soldering flux is suitable for low-temperature welding of indium-based brazing filler metal.
Owner:UNIV OF SCI & TECH BEIJING
Carbon fiber anodizing surface treatment device and surface treatment method
ActiveCN114427109Bsuitable for industrial productionUniform oxidationAnodisationCellsElectrolysisInterlaminar shear
The invention discloses a carbon fiber anodized surface treatment device and a surface treatment method, the device includes an electrolysis unit for carbon fiber anodized surface treatment and a post-electrolysis waste gas treatment unit. The device can flexibly adjust the spacing of the impregnation rollers in the electrolytic cell, control the electrolysis time, oxidize each single filament evenly, and have a good electrolytic oxidation treatment effect. Active functional groups such as oxygen and nitrogen are introduced into the surface of the carbon fiber, and the interlayer shear strength of the carbon fiber composite material is significantly improved; the equipment manufacturing cost is low; the operation is simple, and it is easy to process a large number of carbon fiber bundles, which is suitable for batch production; the electrolysis device is equipped with an inlet suction hood, an outlet suction hood, and a movable cover plate, and a fan is used to extract the ammonia waste gas generated by the electrolysis device to the post-electrolysis waste gas treatment device equipped with a foldable cover plate to produce an acid-base reaction, effectively blocking the escape of waste gas, reducing environmental pollution, avoiding harm to the health of operators during operation, and ensuring safe production.
Owner:CHINA PETROLEUM & CHEMICAL CORP +1