168results about How to "Improve interfacial wettability" patented technology

The invention discloses a high-entropy alloy particle reinforced aluminum base composite material and a stirring casting preparation process thereof. The preparation process adopts mechanical alloying to prepare high-entropy alloy powder and screen to obtain high-entropy alloy particles; the high-entropy alloy particles are sealed by adopting an aluminum alloy pipe having the same material with a basal body; the aluminum alloy pipe weighed in a segmented manner is added in the molten basal body; the high-entropy alloy particles are dispersed by a stirring mode; and the high-entropy alloy particle reinforced aluminum base composite material is prepared by a casting process. The high-entropy alloy particles are 0.1-35%; aluminum alloys are 65-99.9%; and the sum of the two is 1. The high-entropy alloy particles in the structure of the prepared composite material are uniformly dispersed; the high-entropy alloy and aluminum alloy interface bonding compatibility is excellent; the strength and the toughness are excellent; the preparation process is simple; the powder has no need to be treated; the cost is low; the stability is good; and the composite material is suitable for large-batch production and standard production, and is excellent in promotion and application prospect.

The invention discloses a preparation method of a graphene-reinforced copper-based composite and belongs to the field of preparation of high-strength and high-conductivity composites. The method comprises steps as follows: graphene, nano copper powder and cobalt powder in the required mass ratio are mixed in absolute ethyl alcohol, the mixture is physically dispersed under electromagnetic stirring, and then physically dispersed mixed slurry is added to a ball milling tank for mechanical ball milling; after evenly mixed slurry is centrifugally dried, obtained mixed powder is annealed and then subjected to hot-pressing SPS (spark plasma sintering) forming; an obtained block blank is annealed and then subjected to hot extrusion, and the graphene-reinforced copper-based composite is obtained. The graphene-reinforced copper-based composite prepared through the method has the good mechanical property, uniform structure and good heat and electricity conductivity.

The invention provides an additive used in hot-dip galvanizing assistant plating agent, belonging to the technical field of metal material plating. The invention is used for solving the problem of assistant plating efficiency. The technical proposal of the invention is that the additive is a de-ionized water solution; the water solution contains cation surface active agent and organic solvent of the long chain alkyl; the content of the long chain alkyl cation surface active agent is 100 to 800 gram per liter; the organic solvent can be ethanol, isopropyl alcohol, acetone or one of nickel and N-dimethyl formamide, with adding content of 30 to 160 gram per liter. The invention has the advantages that the assistant plating agent is made and the made element have a plating face with excellent wettability and compatibility, which can increase the activity and the utilization rate, improve the assistant plating efficiency, prevent plated element from escaping, prevent the plated element which is assistant plated from being secondarily oxidized in air, reduce zinc slag, prevent the zinc liquid from splashing and increase the surface quality of the made element. Furthermore, the invention can be directly added into the assistant agent, and then is evenly mixed, with the character of easy operation. The invention is not limited by the temperature of the assistant plating agent so that the invention can be used under room temperature.

The invention relates to a thermal conductive adhesive and a preparation method thereof. The thermal conductive adhesive comprises 10 to 45 weight percent of modified acrylic resin, 50 to 85 weight percent of thermal conductive particles and 1 to 5 weight percent of curing initiator. Compared with the existing single-component thermal conductive adhesive, the thermal conductive adhesive disclosed by the invention can be suitable for surfaces of polar substrates such as metal, ceramic and glass, has high cutting speed after being cured and has high curing speed. Compared with the existing two-component thermal conductive adhesive, the thermal conductive adhesive disclosed by the invention has high curing speed and high cutting strength after being cured on one hand, and has no risk of incomplete curing caused by improper proportioning or nonuniform stirring on the other hand. The thermal conductive adhesive can be used for thermal conductive connection between various heat source generators and a radiator.

The invention provides a preparation method of copper-clad silver-clad tungsten composite clad powder, which belongs to the technical field of powder processing and preparation in powder metallurgy. Tungsten powder is washed with alkali and acid and is sensitized and activated, so that preprocessed powder is produced, the surfaces of the preprocessed powder are cladded with silver, so that nano silver-cladded tungsten composite powder is produced, and finally, the silver-clad tungsten composite powder is cladded with copper, so that the copper-cladded silver-cladded tungsten composite clad powder, the copper content of which varies between 5 percent and 50 percent, is obtained. The cladding copper layer and the cladding silver layer in the composite clad powder prepared by the preparation method are uniform and intact, have high purity, and can be controlled in terms of quality. The introduction of the silver layer can remarkably improve the wettability of the tungsten-copper interface. The composite clad powder has good sintering property, the comprehensive properties of tungsten-copper composite material, such as thermal property and mechanical property, can be enhanced, and the composite clad powder can be used as material for the preparation of high-performance tungsten-copper composite material, and has a broad application prospect in the fields of electronic packaging, high-temperature materials, electric contact materials and the like.

The invention discloses a preparation method for a rare-earth-modified graphene reinforced metal matrix composite material. Oxidized graphene is subjected to modifying treatment through rare earth, and then high-dispersity rare earth modified graphene powder is obtained through reduction; the modified graphene powder and metal powder are subjected to ball-milling and powder mixing, and then ball-milled composite powder is packed into a bag; welding and sealing are conducted after vacuum pumping; and the rare-earth-modified graphene reinforced metal matrix composite material is prepared through processes of hot isostatic pressing and hot extrusion forming. By adding trace rare earth elements, oxidizing of the graphene and the metal powder in the preparation process can be reduced, dispersity and interfacial wettability of the praphene in a metal matrix are improved, and the mechanical and conductive properties of a graphene reinforced metal matrix composite material are improved. Meanwhile, the preparation method is simple and easy to carry out in process, low in production cost, suitable for scale production and has good market prospects.

The invention discloses an emulsifying and flushing spacer fluid for improving the cementing quality of an oil-based drilling fluid and a preparation method of the emulsifying and flushing spacer fluid. The spacer fluid is prepared from the following components in parts by weight: 200 parts of water, 5-10 parts of a surfactant, 70-75 parts of base oil, 4-15 parts of a suspension stabilizer, 0.2-3.0 parts of a fluid loss agent, 0.2-2.0 parts of a tackifier, 0.2-5.0 parts of a diluent, 80-400 parts of a weighting agent and 0.05 part of a defoamer, wherein the surfactant is prepared from cocoanut fatty acid diethanolamide CDEA and alkyl glycoside APG in a weight ratio of 1: 2. The emulsifying and flushing spacer fluid which has an emulsifying structure with permeating, dissolving, volume-increasing, carrying functions and the like has a preferable flushing capacity to the oil-based drilling fluid and mud cakes adhered to a casing wall. The surfacant molecules in the spacer fluid can be adsorbed on the surfaces of a casing and a well wall to improve the interfacial wettability, so that cement slurry and the casing and the well wall are better contacted and cemented, and therefore, the first and second interfacial cementation qualities for well cementation are improved.

The invention provides sulphydryl lignocellulose/montmorillonite composite heavy metal ion adsorbent and preparation and application thereof. The adsorbent is formed by sulphydryl lignocellulose and montmorillonite in a composite mode, wherein the mass ratio of sulphydryl lignocellulose to montmorillonite is 1:1-1.5:1, and insertion layers of sulphydryl lignocellulose enter between lamination layers of montomorillonite. The sulphydryl lignocellulose/montmorillonite composite heavy metal ion adsorbent is applied to removing heavy metal in waste water. The preparation method of the sulphydryl lignocellulose/montmorillonite composite heavy metal ion adsorbent has the advantages that preparation is easy, raw materials are easy to obtain, environmental friendliness is achieved, and no secondary pollution occurs; the obtained sulphydryl lignocellulose/montmorillonite composite heavy metal ion adsorbent is free of toxin, capable of being biologically degraded and low in cost and achieves simple and convenient adsorbing operation and a high adsorbing quantity when applied to removing heavy metal ions in waste water.

The invention discloses a method for preparing TiC particle reinforced magnesium base composite material in-situ in the technical field of compound material. The steps are as follows: preparing and mixing Al powder, Ti powder and C powder; the content of the Al powder is 0 wt to 50wt percent of the gross and the atom ratio of Ti atom to C atom is between 0.8 to 1.2; carrying through ball milling on the prepared and mixed powder and pressing the powder after ball milling into a precast block; arranging the pressed precast block and a Mg alloy pig into a vacuum heating device; pumping inert gases into a reaction chamber after vacuumized; heating, maintaining the temperature; mixing a fused mass after reaction, and then standing and casting to form after mixing. The technique of the invention is relatively simple and has a low cost. The TiC particle reinforced magnesium base composite material in-situ prepared has the advantages of petty particles of reinforced phase, uniform distribution, excellent combination with a basic body interface, light weight, high intensity and high mold quantity, etc.

The invention discloses a preparation method of a silver-based contact material containing graphene. The silver-based contact material comprises silver oxide, tin oxide, nickel oxide, lanthanum oxide and silver-plated graphene, wherein the content of tin elements is 5-10 wt%, the content of nickel elements is 2-5 wt%, the content of lanthanum elements is 0.5-1 wt%, the content of the silver-plated graphene is 2.5-3.5 wt%, and the balance inevitable impurities, silver and oxygen. Through optimization selection of the ratios and process of the raw materials, the organization uniformity of the silver-based contact material prepared through the method is improved, and the electrical performance of the material is improved. SnO2 powder is prepared through a sol-gel process. Nano SnO2 is uniformly distributed and dispersed in silver base bodies. Contact resistance reduction caused by an insulation layer formed by enrichment of SnO2 can be avoided. The breaking effect of the oxide on the base bodies is reduced. The processing performance of the silver-based contact material can be effectively improved. The capability of welding resistance and electrical arc erosion resistance of the silver-based contact material are improved. The interface wettability between the graphene and metal is improved through the silver-plated grapheme, and the good interface bonding effect can be achieved, so that the electrical conductivity, the heat conducting property and electrical arc erosion resistance of the composite material are further improved, and the requirement for the performance of electrical contacts is met better.

In order to solve the problems that soldering paste which is environmentally friendly, low in cost and reliable in welding joint under a high-temperature working environment does not exist at present, the invention provides a Sn-Cu lead-free soldering paste, a preparation method of the soldering paste and an application method of the soldering paste and belongs to the field of electronic packaging materials. The soldering paste is composed of tin powder, copper powder and rosin flux. The preparation method includes the steps that the rosin flux is added into the tin powder and the copper powder; next, the tin powder and the copper powder are mechanically mixed through a blender mixer for 10-15 min at the speed of 1,000-1,800 turns/min, and then the soldering paste is obtained. When the working temperature in the air is lower than 350 DEG C, the welding seam shear strength of the high-temperature lead-free soldering paste is greater than or equal to 10 MPa. If pressure of 5-10 MPa is exerted from the outside in the heat treatment process of a welding piece, the welding seam shear strength of the high-temperature lead-free soldering paste is greater than or equal to 20 MPa. The use temperature of samples welded through the soldering paste can reach as high as 400 DEG C, and the soldering paste is high in welding seam shear strength, simple in welding process, stable in performance and low in cost.

The invention provides a phase change wave-absorption and heat-conducting material and a preparation method thereof. The phase change wave-absorption and heat-conducting material is prepared from thefollowing components in parts by weight: 15 to 25 parts of a basic phase change material, 0.1 to 5 parts of an antioxidant, 0.1 to 5 parts of a crosslinking agent, 0.1 to 5 parts of a coupling agent and 60 to 85 parts of wave-absorption and heat-conducting particles, wherein the solid-liquid phase transformation point of the basic phase change material is 40 to 80 DEG C. The phase change wave-absorption and heat-conducting material can be used for dissipating heat of electronic equipment.

The invention relates to the technical field of lithium ion batteries, in particular to an interface layer and a lithium ion battery comprising the interface layer. Lithium halide generated by the in-situ reaction at the interface of a solid electrolyte and a metal lithium negative electrode can optimize the interface contact property and the interface wettability and provide a rapid ion diffusion path. The metal particles generated by the in-situ reaction at the interface of the solid electrolyte and the metal lithium negative electrode can guide the uniform distribution of an electric field, regulate and control the uniform deposition of the metal lithium in the circulation process, and inhibit the formation and growth of lithium dendrites. The lithium ion battery provided by the invention can effectively stabilize the interface between the electrode and the electrolyte, reduces the chemical reaction activity of the metal lithium negative electrode, avoids the side reaction at the interface, and shows higher cycling stability and coulombic efficiency in continuous charge-discharge cycles.

The invention discloses a high-strength nylon composite and a preparation method thereof. The composite is prepared from raw materials in percentage by mass as follows: 40wt%-99wt% of nylon, 0-40wt% of fiber, 0.05wt%-20wt% of a multifunctional material, 0.1wt%-2wt% of an oxidative aging resisting agent and 0.1wt%-2wt% of a lubricant. The preparation method of the composite comprises the steps as follows: nylon, the self-made multifunctional material, the oxidative aging resisting agent and the lubricant are uniformly mixed in a high-speed mixer in the mass ratio, a premix is obtained for lateruse, the premix is added from a main feeding port of a twin-screw extruder, short chopped fiber or continuous long fiber is added from a first side feeding port in proportion, for example, the self-made multifunctional material is added from a second side feeding port of the extruder in proportion in a filler form, the temperature of the extruder is controlled at 210-280 DEG C, the obtained material and drawn out, cooled and granulated, and the composite is obtained. Compared with the prior art, the composite has the advantages that the self-made multifunctional material has a synergistic effect with fiber after being added, the rigidity, toughness and thermal deformation of the prepared composite are substantially improved, meanwhile, the prepared composite material has no floating fiberand white spots in appearance, high wear resistance and lower strength reduction after thermo-oxidative aging.

The invention discloses a preparation method for a copper-based electric contact material with graphene. The copper-based electric contact material comprises copper, tin oxides, dysprosium oxides, lanthanum oxides and copper-plated graphene, wherein the content of the tin element is 5-10 wt%, the content of the dysprosium element is 0.2-0.5 wt%, the content of the lanthanum element is 0.5-1wt%, the content of the copper-plated graphene is 1.5-2.5 wt% and the balance comprises unavoidable impurities, and the balance elements are copper and oxygen. According to the copper-based electric contact material prepared by the preparation method, by optimally selecting the proportion of raw materials and technology, the material is enhanced in texture uniformity and improved in electrical property, particularly the rigidity and wear-resisting property of the material are improved by doping rare earth elements, and the interface wettability between the graphene and the metal is improved by the copper-plated graphene, thus the acquisition of the good interface bonding is facilitated, the electrical conductivity, heat-conducting property and anti-arc erosion performance of the composite material are further improved, and the performance requirement of the electric contact can be better met.

The invention relates to a manufacturing method of a composite lightweight flexible high thermal conduction carbon/metal connection member and belongs to the technical field of connection members. According to the method, firstly, surface treatment on brightness of a carbon material is carried out, one or more layers of metal is plated on the surface in a chemical or an electroplating mode, the treated carbon material and the metal are composited, the composition effect of the carbon/metal is greatly reinforced, and the interface thermal resistance between the two can be effectively reduced. According to the method, the manufactured composite lightweight flexible high thermal conduction carbon/metal connection member has higher thermal conduction coefficient than copper, and density is only one quarter of the copper. Through the method, requirements of weight reduction and efficient thermal conduction of the aerospace field and portable electronic devices can be satisfied; as the connection member is flexible, the distance and the position between the electronic device and a heat sink can be flexibly designed and adjusted, and strong designability is realized.

The invention discloses an aluminum alloy drill rod composite material with solid self-lubrication and a preparation method. The composite material consists of two parts: a substrate and a precursor,wherein the substrate comprises the following components in percentage by mass: 3.8-4.9% of Cu, 1.2-1.8% of Mg, 0.30-0.90% of Mn, and the balance of Al. The precursor is 20-30% of the substrate by mass; and the precursor is formed by a high-entropy alloy Ti2CoCrFeNiCu coating MoS2+C particles. The preparation method comprises the following steps: the precursor is prepared; the raw materials of thesubstrate are prepared; then, the precursor is injected in a solid particle fluidizing conveyor of spraying deposition equipment; finally, the raw materials of the substrate are molten by a cruciblesmelting furnace for flowing to a metal liquid pocket; and metal liquid and the precursor are synchronously atomized to form a solid-liquid atomization mixture for deposition to obtain a wear-resistance composite material casting blank with self-lubrication for extrusion molding.

The invention belongs to the technical field of preparation of advanced metal-based composite materials, and particularly relates to a preparation method of a titanium-graphene composite material with matched reinforced-plasticity. The preparation method comprises the following steps that firstly, proper metal nanoparticles or nanolayers on the surface of graphene are selected for modification to prepare metal modified reduced graphene oxide nanopowder; the metal modified graphene is ultrasonically dispersed in a mixed solution of alcohol and deionized water, a proper amount of titanium alloy powder is slowly added into a dispersion solution, and uniformly stirring and dispersing are carried out in a water bath at 80 DEG C to obtain composite powder; and the composite powder is sintered and subjected to subsequent hot working deformation densification, and a titanium-graphene composite plate or bar with matched high reinforced-plasticity is obtained. According to the method, eutectoid elements in titanium alloy are adopted for modifying graphene, and metal nanolayer particles are formed. The load transfer strengthening effect of the graphene is enhanced, and the plasticity of the graphene strengthened titanium-based composite material is improved.

The invention discloses a titanium/titanium carbide core-shell structure reinforced aluminum matrix composite material. The material is composed of pure aluminum or aluminum alloy matrix and a titanium/titanium carbide core-shell particle reinforced phase. According to the reinforced phase, titanium serves as the core, a titanium carbide ceramic layer serves as a shell, and the dimensions of titanium carbide particles inside the shell change in a gradient manner. The invention further discloses a preparation method of the titanium/titanium carbide core-shell structure reinforced aluminum matrix composite material. According to the titanium/titanium carbide core-shell structure reinforced aluminum matrix composite material, the toughness of the composite material is improved because of thehigh-toughness titanium core, the strength of the composite material is improved because of the titanium carbide ceramic layer with the high volume fraction, and therefore, the aluminum matrix composite material has the high strength and the good toughness at the same time.

The invention provides an additive applied to a battery electrolyte, which has a structure as shown in the following (I), and a substituent group is shown in the specification. The invention also provides an electrolyte and a battery using the additive. The additive provided by the invention can effectively reduce the interface impedance and charge transfer impedance between graphite, silicon carbon and other negative electrode materials and an electrolyte, thereby effectively improving the cycle stability and rate capability of the negative electrode materials.