62results about How to "Solve the problem of low bonding strength" patented technology

The invention discloses a method for preparing cross-linking waterborne adhesive for lithium ion batteries. Waterborne polymers containing organic carboxylic acid, amino or hydroxyl and a water-soluble micromolecular cross-linking agent containing hydroxyl, amino or carboxyl are jointly used as raw materials of the waterborne adhesive and subjected to cross linking through esterification and amidation under the condition of coating and drying of electrode plate paste of the lithium ion batteries. A preparation process is simple, existing lithium ion battery production process conditions are unchanged, electrodes high in bonding performance, flexibility and elasticity are obtained, and problems of low bonding strength among electrode active substances, conductive agents and current collectors and looseness and shedding due to insufficiency in elasticity for relieving expansion and contraction in charging and discharging processes of the lithium ion batteries in the prior art are solved.

The invention provides a rapid-hardening early-strengthening wearable concrete material for road repair and its preparation, wherein the material mainly comprises the following ingredients, steel slag powdered ore 40-80kg/m3, metakaolin 320-560kg/m3, alkaline exciting agent solution 200-300kg/m3, steel slag fine aggregates 630-1800kg/m3, steel fiber 62-156kg/m3, and polypropylene fiber 1kg/m3.

The invention belongs to the technical field of polymer composite materials and in particular relates to a composite material of a high-temperature resistant metal-fabric/resin self-lubricating bearing and a preparation method of the composite material. The composite material comprises three layers, wherein the bottom layer is a metal plate; the middle layer is a porous sintered tin bronze powder layer, and self-lubricating wear-resisting resin is impregnated in a pore; the surface layer is made of the composite material of mixed fabric and self-lubricating wear-resisting resin; the mixed weaved fabric is the composition of at least two materials of polytetrafluoroethylene fiber, carbon fiber, aramid fiber, polybenzimidazole fiber and glass fiber; and the self-lubricating wear-resisting resin is the blend of one or more of polyphenylene sulfide, polytetrafluoroethylene, polyether-ether-ketone and nylon. The composite material of the bearing has good high-temperature resistance, high loading capacity, good wear resistance and good self-lubricating property, solves the problems of high wear rate, poor wear resistance, low-temperature resistance and the like of the material of a DU bearing, and realizes the excellent frictional property and using reliability under high temperature of the material of the bearing. The composite material is applicable to the self-lubricating bearings in the fields of aeronautics and astronautics, machinery, automobiles, home appliances, office facilities and the like.

The invention relates to the field of a part forming process, and discloses a selective laser melting forming method of a multi-material part. The method comprises the following steps of S1, part model design, wherein during modeling, materials meeting forming needs are combined to be arranged according to the proper distribution rule, and part model design is finished in an optimized manner; S2,process model obtaining, wherein a designed part model is subjected to size and shape compensation, chamfering, remaining adding, process support design and the like, and a process model is obtained;S3, control file generation, wherein the obtained process model is subjected to layered slicing, the material kind, material distribution and material boundary information contained in each layer areextracted, and a control file guiding an additive manufacturing forming process is generated; S4, additive manufacturing forming; and S5, forming aftertreatment. According to the method, through the selective laser melting forming technology, the high-precision high-quality multi-material part can be formed.

The invention provides a preparation method of a copper/graphite film multi-layer laminated blocky composite material, which can be applied in the field of electronic packaging of an integrated circuit industry. The raw materials of the composite material adopt an anisotropic high-thermal-conductivity net-shaped graphite film and electrolytic pure copper powder. The preparation method comprises the following steps: adding the copper powder into a uniformly mixed solution of an adhesive prepared from polyvinyl butyral and an ethanol solution as well as dimethyl phthalate serving as a plasticizer, completely stirring to obtain uniform slurry with high flowability, spreading the slurry on the net-shaped graphite film uniformly, drying, cutting, degumming, superposing layer by layer, and performing bidirectional pressurizing and sintering to prepare the compact multi-layer laminated blocky composite material with the graphite film and metal copper which are arranged alternately in a layered mode. The heat conductivity of the composite material along the plane direction of the graphite film is 1.5 to 2 times higher than that of pure copper, the density can be reduced to be 65 to 80 percent of the density of the pure copper, and the composite material can be used for replacing the traditional copper tungsten metal heat-conducting material.

The invention discloses a method for producing a semi-metallurgical metal composite tube through electric resistance welding. The method includes the steps that firstly, a base tube and a liner tube are machined; secondly, the base tube and the liner tube are assembled and mechanically composited to form a mechanical metal composite tube; thirdly, welding preparation of electric resistance welding is conducted, two electric resistance welding electrodes of an electric resistance welding machine are installed at the two ends of the mechanical metal composite tube respectively, one electric resistance welding electrode is installed on the extending section at one end of the liner tube, and the other electric resistance welding electrode is installed at one end of the base tube; fourthly, electric resistance welding is conducted, the base tube and the liner tube in the mechanical metal composite tube are welded through the electric resistance welding machine; and fifthly, subsequent machining is carried out. The method is simple in step, reasonable in design, convenient to implement, high in welding quality and good in use effect. Bonding strength between the base tube and the liner tube in the machined and formed semi-metallurgical metal composite tube is high. Besides, machining efficiency is high, and machining quality is easy to guarantee.

The invention discloses nanometer heat insulation paint and a preparation method thereof. The nanometer heat insulation paint is mainly prepared from the following raw materials in parts by weight: 30to 40 parts of silicone acrylic emulsion, 6 to 10 parts of ceramic microbeads, 5 to 10 parts of silica gel, 14 to 20 parts of titanium dioxide, 1.5 to 2 parts of carbon nanometer tubes, 2 to 6 partsof nanometer tin dioxide, 3 to 5 parts of nanometer zirconium oxide, 8 to 12 parts of quartz powder, 0.4 to 0.8 part of cellulose thickening agents, 0.4 to 0.7 part of dispersing agents, 0.2 to 0.6 part of anti-foaming agents, 0.3 to 0.5 part of leveling agents, 1.3 to 1.7 parts of coalescing agents and 22 to 26 parts of deionized water. The nanometer heat insulation paint can effectively solve the problem of low bonding strength of the paint on a wall body, and has the advantages of good heat insulation effect, short curing time, strong adhesive force, long service life and the like.

The invention provides a coastal reservoir land reclamation type bank protection structure. The coastal reservoir land reclamation type bank protection structure comprises earth-filled interface steps, water-permeable earth-filled layers and water-impermeable earth-filled layers, wherein the earth-filled interface steps are arranged along a bank protection foundation slope surface; each water-permeable earth-filled layer is arranged on the corresponding earth-filled interface step in a covering manner; and each water-impermeable earth-filled layer is arranged on the corresponding water-permeable earth-filled layer in a covering manner. The water-impermeable earth-filled layers are arranged into a multi-level step structure along the bank protection foundation slope surface from bottom to top. A water-permeable earth-filled layer is also arranged at the whole bottom of the water-impermeable earth-filled layer step at each level. Anti-seepage geotechnical cloth is arranged between each water-permeable earth-filled layer and the corresponding water-impermeable earth-filled layer. The water-permeable earth-filled layers are formed by being filled with sand gravel. The water-impermeableearth-filled layers are formed by being filled with a viscous soil body in a layered manner. By means of the coastal reservoir land reclamation type bank protection structure, the land-filled structure which guarantees stability of a coastal reservoir bank slope and meanwhile newly increases land is formed; the geological environment of a coastal reservoir region is effectively protected; and exploitation and utilization of bank slope land resources are promoted.

The invention relates to a bonding reinforced modified material and an application thereof in wet joint concrete of a steel-concrete composite bridge deck. The bonding reinforced modified material iscomposed of the following components in percentage by mass: 55 to 70 percent of an expansion component, 20 to 35 percent of silica fume, 0 to 2.5 percent of an early strength component, 1.8 to 5 percent of a tackifying and toughening component, 1 to 3 percent of a water reducing component, 0.5 to 2.0 percent of a shrinkage reducing component, 0 to 0.25 percent of a tackifying and water retaining component and 0 to 1 percent of a defoaming agent. The bonding reinforced modified material provided by the invention solves the problems of cracking of wet joint concrete, cracking of new and old concrete interfaces, large early tension creep and low bonding strength of new and old concrete, and is suitable for wet joint engineering with high requirements on bonding and shrinkage creep propertiesof new and old concrete interfaces.

The invention relates to a method of micro-arc oxidation for steel surface. The steel surface can obtain a compact ceramic layer through the method of micro-arc oxidation for the steel surface, and the method of micro-arc oxidation for the steel surface can be used for improving the anti-corrosion performance of steel. A layer of aluminum with high bonding strength is firstly welded to the surfaceof a steel substrate in an aluminum steel melting-braze welding method, then the ceramic layer is obtained through a micro-arc oxidation technology, the problem of low bonding strength of the ceramiclayer on the steel substrate is solved on the one hand, and the anti-corrosion performance of the steel can be improved on the other hand.

A water-based liquid reinforcing material for high-performance water-permeable concrete is disclosed. Raw materials of the water-based liquid reinforcing material include, by weight, 5-20 parts of powder reinforcing polymer, 35-50 parts of nanometer silica fume, 10-20 parts of a water reducing agent, 3-5 parts of a viscosity adjusting agent, 0.2-2 parts of a defoamer, 0.1-2 parts of a retarder, 0.5-1 part of a rheological agent and 10-15 parts of an early strength agent. A preparation method of the water-based liquid reinforcing material is also disclosed.

The invention relates to a method for preparing lithium ferrite anticorrosive coatings by flame spraying. Lithium ferrite conductive anticorrosive coating materials, prepared by adopting a manipulator through optimizing the technological parameters of oxygen-acetylene flame spraying, have excellent corrosion resistance and conductivity. The preparation method, provided by the invention, has the advantages of simple process, high deposition rate, strong repeatability and low facility request, can directly implement the spraying construction on site so as to meet the construction and repair requirements of actual grounding network engineering, and can be applied to metallic matrix surfaces with different shapes or different sizes; in particular, the preparation method has more advantages when preparing large-area anticorrosive conductive coatings for practical application; and meanwhile, the maintenance is simple in the workpiece service process, so that the preparation method is suitable for industrial popularization and application.

The invention relates to the field of chemical engineering, and particularly discloses a polyurethane structural adhesive and a preparation method and application thereof, the polyurethane structuraladhesive comprises a component A and a component B, and the component B is a curing agent; wherein the component A comprises the following raw materials: grease polyol, polyether polyol, polyester polyol, a solvent, a molecular sieve, a filler and a catalyst; wherein the solvent is selected from any one or more of dimethylformamide, dimethyl sulfoxide, ethyl acetate or cyclohexanone. The preparedpolyurethane structural adhesive is high in bonding strength, by adding a small amount of solvent into the component A, an SMC composite material base material does not need to be treated at all before the adhesive is used, and the problems that an existing adhesive needs to treat the surface of an SMC composite material before bonding to achieve effective bonding and is low in bonding strength are solved; the preparation method provided by the invention is simple, and the prepared polyurethane structural adhesive is high in curing rate after sizing, so that the production efficiency is greatly improved.

The invention discloses a zirconium nitride aluminum/aluminium oxide composite coating firmly combined with a hard alloy. The zirconium nitride aluminum/aluminium oxide composite coating is a whole composed of five sublayers of a CoNiCrAlY high entropy alloy bonding layer, an alpha-Cr2O3 oxide template layer, an alpha-Al2O3 oxide supporting layer, a AlZrON nitric oxide cohesion layer and a AlZrN nitride wearing layer, wherein the five sublayers are arranged from the inside to outside in sequence, and the total thickness of the coating is 1-2.5 microns. A preparation method of the coating comprises the following steps that after a hard alloy substrate is heated and subjected to ion etching, firstly, a CoNiCrAlY layer is deposited on the substrate by using an electric arc evaporation platingprocess, and then the alpha-Cr2O3 layer, the alpha-Al2O3 layer, the AlZrON layer, and the AlZrN layer are sequentially deposited by using a magnetron sputtering process. The high entropy alloy bonding layer is adopted, different functional sub-layers cooperate with one another, so that the bonding between the coating and the hard alloy substrate is firm, the comprehensive performance of the coating is excellent, the process is simple, and the implementation is easy.

The invention discloses a hole-type rolling forming method for a metal layered composite plate. The hole-type rolling forming method comprises the following steps: fixing a to-be-compounded steel plate and a to-be-compounded aluminum plate to form a steel/aluminum assembled plate blank; performing cold rolling by utilizing a hole-type cold rolling mill to prepare a steel/ aluminum layered composite plate; and preparing a to-be-compounded aluminum alloy plate, processing the steel/ aluminum layered composite plate and the to-be-compounded aluminum alloy plate, aligning and stacking according toa sequence of aluminum alloy/ aluminum/ steel/ aluminum alloy, fixing to form an aluminum alloy/ aluminum/ steel/ aluminum alloy assembled plate blank, heating to a preset temperature, rolling by utilizing a hole-type hot rolling mill to prepare an aluminum alloy/ aluminum/ steel/ aluminum alloy layered composite plate, and separating from a steel-steel interface to obtain an aluminum alloy/ aluminum/ steel layered composite plate. The hole-type rolling forming method effectively solves the problems that component metal is not coordinated in deformation, the interface is easily oxidized and the bonding strength is low in a rolling process of the steel/ aluminum alloy layered composite plate, and realizes continuous preparation of the steel/aluminum alloy layered composite plate with highinterface bonding strength and stable performance.

The preparation method comprises the following steps: preparing a special-shaped strip with a trapezoidal cross section by taking a silver metal oxide composite silver core-spun wire as a raw material, grinding to remove a silver layer on the lower bottom surface of the trapezoidal cross section, and matching with a copper-based strip with a slotted trapezoidal groove, so as to prepare the silver metal oxide embedded composite strip. And the silver metal oxide inlaid composite strip is prepared after hot rolling compounding. According to the invention, the bonding strength between the silver metal oxide and the copper-based material can be effectively improved, especially the bonding strength of the bonding interface between the silver metal oxide of the vertical working surface of the inlaid composite strip and the copper-based material, and the interface is prevented from cracking in the bending forming process.

The invention provides a method for improving silicon wafer bonding force, and is characterized in that a silicon dioxide film grows on one silicon wafer through plasma chemical vapor deposition; and two silicon wafers are bonded and annealed at normal temperature and normal pressure. According to the invention, the problem of low bonding strength of two silicon wafers at normal temperature and normal pressure is solved, the use limitation of the silicon wafers is improved, the available silicon wafer range is expanded, the bonding strength of the bonded silicon wafers is improved, and the yield and quality of products are ensured.

The invention discloses a photovoltaic junction box copper-clad aluminum current-conducting plate and a precision rolling compound method thereof. Firstly, a three-layer pure copper-pure aluminum-pure copper composite plate is selected as a rolling base plate, wherein the thickness of the base plate is 2mm, the thickness after rolling is about 0.7mm, and the thickness ratio of a single-sided pure copper surface layer to a pure aluminum middle layer is 1 to 6. A precision rolling compound process comprises two steps of rolling at room temperature and diffusion annealing, and comprises the concrete steps of firstly precision-rolling the base plate to the required thickness at room temperature, wherein the rolling reduction ratio is 65 percent; then carrying out the diffusion-annealing for 1h at the temperature of 300 DEG C. Layers of a copper-clad aluminum sheet obtained through the invention are in metallurgical bonding in a sawtooth shape; the copper-clad aluminum sheet has both excellent electrical conductivity and less proportion of copper, so that the copper-clad aluminum sheet meets the comprehensive performance requirement of the photovoltaic junction box current-conducting plate, furthermore, the bending resistance is high, and the bonding strength between the composite plates is improved. Since the volume percentage of the aluminum replacing the copper reaches up to 75 percent, the cost of the current-conducting plate is remarkably reduced.

The invention discloses a method for preparing a ceramic multilayer film on a metal surface by chemical heat treatment. The method comprises the following steps: firstly, preparing a metal/metal multilayer film with carbide or nitride or nitride forming ability on the surface of a metal matrix needing surface strengthening by utilizing a physical vapor deposition method; then performing high-temperature heat treatment on a sample to promote mutual diffusion of metal element layers; lastly, performing carburizing treatment or nitriding treatment or nitriding treatment on the sample, and making the sample react with metal along with inward diffusion of carbon or nitrogen, so that the metal/metal multilayer film is converted into a carbide/carbide nitride/nitride multilayer film; and finally forming a ceramic/ceramic multilayer film on the surface of the matrix. Compared with the prior art, the method has the advantages that mutual diffusion of metal elements of an interlayer interface can be promoted, a high-strength interlayer interface and a film-based interface which are metallurgically bonded are formed, and the comprehensive mechanical property of a film layer is remarkably improved.