3601results about "Liquid/solution decomposition chemical coating" patented technology

The invention discloses low-dielectric photosensitive polyimide resin as well as a preparation method and application thereof. The invention discloses a low-dielectric photosensitive polyimide resin for a flexible copper-clad circuit board, and aims to provide the low-dielectric photosensitive polyimide resin for the flexible copper-clad circuit board, the polyimide resin provided by the invention has low dielectric constant and is more beneficial to reduction of electric energy loss, and the technical scheme is as follows: after a photosensitive monomer is copolymerized with dianhydride and diamine, the low-dielectric photosensitive resin is obtained through imidization; the chemical structural formula is # imgabs0 #, and belongs to the technical field of high polymer materials.

The invention relates to the technical field of metal surface protection, and discloses a corrosion-resistant self-repairing metal fastener and a preparation method thereof.The corrosion-resistant self-repairing metal fastener comprises a zinc alloy matrix, a nanometer passivation layer, a slow-release corrosion-resistant layer and a self-repairing functional layer, and the nanometer passivation layer, the slow-release corrosion-resistant layer and the self-repairing functional layer sequentially wrap the zinc alloy matrix; the zinc alloy matrix consists of Al, Cu, Mg, Ce and Zn; the nano passivation layer adopts zinc phosphate / silane composite sol to construct a Si-O-P covalent bond network, and plasma is combined to graft epoxy groups to enhance the interface bonding strength; the slow-release anti-corrosion layer is used for loading a pH response type benzotriazole derivative through gradient aperture mesoporous silica, so that the dynamic controlled release of a corrosion inhibitor is realized; the self-repairing functional layer adopts a synergistic effect of a mechanical triggering type sulfydryl siloxane microcapsule and a pH triggering type EDTA chelating agent microcapsule to form a physical plugging-chemical passivation dual-mode repairing mechanism. Through four-stage cooperation of matrix modification, interface strengthening, slow-release regulation and control and intelligent repair, the corrosion resistance of the corrosion-resistant self-repairing metal fastener in a complex environment is remarkably enhanced.

The invention belongs to the technical field of medical materials, and relates to a titanium-based implant surface dual drug release system and a preparation method and application thereof. Comprising a titanium-based implant and a hydrogel layer attached to the surface of the titanium-based implant, the surface of the titanium-based implant is of a nanotube array structure, zinc oxide nanoparticles and up-conversion luminescent material particles are arranged between the titanium-based implant and the hydrogel layer, and MgO2 nanoparticles are loaded in the hydrogel layer; wherein the material of the up-conversion luminescent material particles is NaYF4: Yb < 3 + >, Er < 3 + >, and the hydrogel layer is composed of gelatin-sodium alginate hydrogel. The titanium-based implant surface dual-drug release system provided by the invention can realize loading of different drugs, can be used for treating various diseases, has a better time sequence control effect, is long in action time and low in cost, and has a wide application prospect.

The invention discloses a preparation method of low-loss high-saturation iron-nickel soft magnetic powder. Comprising the following steps of S1, alloy smelting and S2, atomization. S3, carrying out ball milling treatment; s4, annealing treatment; s5, carrying out surface coating; the low-loss high-saturation iron-nickel soft magnetic powder is prepared from the following raw materials in percentage by weight: 77.6%-78.2% of electrolytic nickel, 21.4%-22.3% of electrolytic iron and 0.1%-1% of an additive, the performance of the iron-nickel soft magnetic powder and a magnetic powder core prepared by the process is improved in multiple aspects, and the iron-nickel soft magnetic powder has great application advantages.

The invention discloses a multi-layer plating process for optimizing surface characteristics of a base material, which is characterized by comprising the following steps of: pretreating the surface of a plated base material, improving the surface smoothness of the base material, and removing dirt on the surface of the base material; electroplating the base material by using the nickel pre-plating solution; chemical plating: the base material subjected to pre-plating treatment is placed in a chemical composite plating solution for chemical plating; the chemical composite plating solution comprises a basic plating solution and second-phase particles, the second-phase particles are nano niobium carbide, and the second-phase particles are wrapped and embedded into an alloy plating layer in the chemical plating process, so that the second-phase particles are distributed in plating layer matrix metal in a discrete mode to form a discontinuous phase. The hard particles niobium carbide are added and are dispersed and distributed in a coating substrate (Ni-P alloy), the hard particles can effectively refine the substrate metal, so that the hardness of the substrate metal is improved, and the niobium carbide hard phase particles are high in hardness, excellent in wear resistance, large in yield limit and high in pressure resistance.

The invention provides a lead-free high-phosphorus chemical nickel plating solution, and relates to the technical field of chemical nickel plating, and the lead-free high-phosphorus chemical nickel plating solution comprises the following components: 4-10 g / L of nickel salt, 6-12 g / L of a complexing agent, 0.1-0.8 g / L of a brightener, 8-12 g / L of a reducing agent, 0.4-0.8 g / L of a stabilizer, 1-5 g / L of a plating starting agent, 0.1-0.6 g / L of an anti-cracking agent, 0.5-1.5 g / L of an accelerator and 0.1-0.5 g / L of a wetting agent. The excellent chemical nickel-plating process of the circuit board and the carrier plate can be realized, and the chemical nickel-plating solution has the characteristics of high deposition rate, excellent stability, brightness, smoothness, no skip plating or diffusion plating, excellent binding force and the like.

The invention relates to the technical field of rare earth metal electrolysis cathode protection coatings, in particular to a high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating on the surface of a tungsten cathode. A metallurgically bonded strong bonding bottom layer is constructed on a tungsten substrate through surface pretreatment and reactive sintering, then an atmosphere plasma technology is adopted to spray a creep-resistant gradient layer with continuous components to buffer thermal stress, and finally a sol-gel technology is utilized to construct an extremely compact corrosion-resistant surface layer in a superposition mode. The high-temperature-corrosion-resistant yttrium-stabilized zirconia gradient coating is constructed through a multi-scale and multi-mechanism synergistic effect, the problems that a tungsten cathode coating is insufficient in binding force and poor in thermal shock resistance are fundamentally solved, molten salt permeation can be blocked, and the service life of a tungsten cathode in a severe environment is remarkably prolonged.

The invention discloses low-silver-content silver-coated copper powder and a preparation method and application thereof.The preparation method includes the steps that copper powder is pretreated and then mixed with water, a dispersing agent and sodium tartrate to be stirred, and a copper precursor solution is obtained; slowly dropwise adding a small amount of silver-ammonia solution into the copper precursor solution for reaction; and mixing a complexing agent with the residual silver-ammonia solution, dropwise adding the mixture into the reaction solution, raising the temperature, continuously reacting for a period of time, dropwise adding a reducing agent into the reaction system, continuously reacting, and after the reaction is finished, carrying out solid-liquid separation, washing and drying to obtain the silver-coated copper. According to the method, firstly, gradient control is conducted on the concentration of silver ions, a layer of uniform silver crystals are replaced on the copper surface, then the residual silver ions are adsorbed to the surface through the double-face adsorption effect of the complexing agent and then are replaced, and therefore the uniform silver shell is formed. A reducing agent is utilized to drive silver crystals to grow under low concentration, and the structure of a silver layer is improved in the preparation process, so that the silver layer has good oxidation resistance and conductivity.

The invention discloses a component gradient iridium tantalum coating anode and a preparation method thereof, the component gradient iridium tantalum coating anode comprises a titanium-based bottom layer, a middle layer and a surface active layer structure with component gradient, and the middle layer and the active layer are both prepared through a thermal decomposition method. And the intermediate layer is prepared on the titanium substrate and is composed of TiO2 / Ta2O5 mixed oxide. The surface active layer is prepared on the outer side of the middle layer and comprises a plurality of layers of IrO2 / Ta2O5 oxide coatings with different iridium-tantalum proportions. Compared with a traditional uniform coating anode, the prepared component gradient iridium tantalum coating anode can relieve the stress concentration phenomenon and reduce coating cracking, the service life of the anode is remarkably prolonged, and the catalytic activity of the anode is remarkably improved; the modified carbon nano tube is added into the active layer precursor solution, so that the conductivity change caused by component gradient is improved, and the cell voltage of the component gradient iridium tantalum coating anode is effectively reduced; and moreover, the iridium content is lower, and the preparation cost of the electrode is reduced.

This application discloses an optical module housing and a manufacturing method thereof, an optical module, and an optical communication device. The optical module housing includes a housing body and a plating layer, where the plating layer is located on a surface of the housing body, a roughness Ra of the plating layer at least in a contact area does not exceed 0.6 μm, and the contact area is an area that is of the optical module housing and that is configured to be in contact with a heat sink. According to this application, the roughness Ra of the plating layer in the contact area is set not to exceed 0.6 μm, so that when the optical module is connected to an optical module connector, a gap between the contact area of the optical module housing and the heat sink is smaller.

The invention belongs to the field of materials, and particularly relates to a composite thermal interface material and a preparation method thereof. The preparation method comprises the following steps: plating non-reactive metal, non-reactive metal carbide or non-reactive ceramic on the surface of diamond micro powder, inducing lattice defects on the surface of a plating layer and alloying a local interface by combining a mechanical force field, and defoaming to obtain the composite thermal interface material. The composite thermal interface material has high thermal conductivity and long-term stability, and the contradiction between excessive alloying of a traditional reactive coating and high interface thermal resistance of a non-reactive coating is solved. The method is particularly suitable for the field of thermal management of high-end electronic devices such as 5G chips and power modules.

The invention relates to a multi-layer body, comprising (I) a carrier layer made of a special thermoplastic polycarbonate molding compound and (II) a metal layer which has one or more recesses. The invention also relates to a lighting or display unit, comprising the multi-layer body and a light source, to a method for producing the multi-layer body, and to the use of the special thermoplastic polycarbonate molding compound as a carrier layer of such a multi-layer body.

The invention discloses an anode material for adipic acid monoester electrolysis and a preparation method of the anode material, the electrode solves the key problems that a platinum layer is easy to fall off, the catalytic activity is low, the organic matter poisoning resistance is poor and the like of a traditional titanium platinum-plated electrode through multi-scale interface strengthening and nano structure regulation and control; the preparation method comprises the following core steps: constructing a porous ZrO2-TiO2 composite oxide layer on the surface of a titanium substrate by adopting a micro-arc oxidation-hydrothermal composite process, and generating platinum nanoparticles in situ to pre-fill pores, so that the anchoring effect of a platinum layer is remarkably enhanced; depositing a platinum / carbon nano tube (Pt / CNT) composite catalyst layer on the surface of the oxide layer through a pulse-ultrasonic synergistic electroplating technology, wherein the carbon nano tube is used as a conductive framework to inhibit platinum agglomeration; through vacuum annealing and electrochemical activation treatment, the interface bonding force and active site exposure are further optimized; the electrode shows excellent performance in an adipic acid monoester electrolysis system, and efficient electrocatalytic conversion from adipic acid monomethyl ester to dimethyl sebacate is achieved.

The invention discloses a lead zirconate titanate film material with an ultrahigh voltage coefficient as well as a preparation method and application of the lead zirconate titanate film material, and belongs to the technical field of electronic material development and film materials. The preparation of the lead zirconate titanate film material is realized by adopting a sol-gel spin-coating method and controlling the annealing times. The piezoelectric film material provided by the invention can be directly deposited on a Si substrate coated with metal Pt, does not need to introduce an additional buffer layer or dope any element, is short in annealing time and simple in preparation process, all required raw materials are cheap and easy to obtain, and the piezoelectric film material particularly has high orientation degree, low coercive voltage and excellent ferroelectric and piezoelectric properties, is suitable for preparing large-size (2-4 inches) wafers, and has a wide application prospect. And huge application potential is shown in the field of piezoelectric micro-electro-mechanical system (MEMS) devices.

The invention belongs to the technical field of conductive microsphere preparation, and particularly relates to a surface-roughened nickel-plated conductive microsphere and a preparation method and application thereof. The preparation method comprises the following steps: carrying out pretreatment to enable the surfaces of the polymer microspheres to contain nickel ions, reducing the nickel ions into nickel nanoparticles, activating the microspheres and carrying out chemical plating. According to the invention, the specific surface area of the conductive microspheres is increased by reducing the nickel nanoparticles on the surfaces of the microspheres, a large amount of impurities cannot be generated among the microspheres, and adhesion among the microspheres can be effectively prevented. According to the prepared conductive microspheres, the plating layer and the polystyrene microspheres are firmly combined, and the risk that the conductivity is reduced due to the fact that the surface of the plating layer falls off is reduced. The preparation method is safe, environment-friendly, simple, convenient and suitable for industrial production requirements.

The invention relates to the field of design and preparation of powder metallurgy friction materials, in particular to a copper-based powder metallurgy friction material and a preparation method thereof. Raw materials used in the method comprise, by mass, 45%-55% of copper powder, 8%-20% of iron powder, 6%-15% of ferrochromium, 16%-22% of graphite, 0.5%-4% of molybdenum disulfide, 0.5%-4% of tin sulfide and 0.5%-4% of nickel-coated tungsten disulfide, and the mass ratio of the tin sulfide to the nickel-coated tungsten disulfide is (1-2): (1-2). In the nickel-coated tungsten disulfide, the content of nickel is 5-40%; the sum of the total amount of molybdenum disulfide, nickel-coated tungsten disulfide and tin sulfide is less than or equal to 5%. The preparation method comprises the following steps: weighing raw material powder according to the designed components, mixing, pressing and sintering to obtain the product. The composition design has the characteristics of scientificity, simple and controllable process and the like, and the obtained product has excellent tribological performance and completely meets the friction braking requirement of high-speed heavy-load equipment of 400km / h and above.

The invention relates to the technical field of glass through hole machining, and discloses chemical plating equipment for TGV machining and a chemical plating method.The chemical plating equipment comprises a plating tank, a driving component, a hook, a hanging basket, a heating component, a plating solution circulating component, an air injection component, a vibration component and a control component, and the plating tank is provided with a containing cavity with an opening in the top; the driving part is arranged above the plating tank; one end of the hook is connected with the driving part, and the other end extends towards the accommodating cavity; the hanging basket is hung on the hook, at least part of the hanging basket extends into the containing cavity, and the hanging basket is used for containing a to-be-processed glass substrate; the heating part is arranged around the accommodating cavity; the plating solution circulating component is provided with a solution outlet and a solution inlet, and the solution outlet and the solution inlet are both communicated with the containing cavity; the air injection component is inserted into the accommodating cavity; the vibration component is arranged on the plating tank; and the control component is electrically connected with the driving component, the heating component, the plating solution circulating component, the air injection component and the vibration component. During processing, the glass substrate is in full contact with a plating solution, so that the uniformity of a plating layer can be improved, and skip plating is reduced.

A photosensitive surface treating agent containing a compound represented by the following Formula (M1). In Formula (M1), R1 is a linear, branched or cyclic alkyl group having 1 to 6 carbon atoms, Y1 is a linear or branched alkylene group having 1 to 4 carbon atoms or a single bond, and the terminal carbon atom of the alkyl group for R1 may be bonded to a carbon atom constituting the alkylene group for Y1, and R1 and Y1 may form a ring. R2 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, R3 and R4 are each independently an alkyl group having 1 to 3 carbon atoms, n0 is an integer of 0 or more, and X is a halogen atom or an alkoxy group.

The invention discloses corrosion-resistant flaky silver-coated copper powder, a preparation method of the corrosion-resistant flaky silver-coated copper powder and an electromagnetic shielding shell, and the preparation method of the corrosion-resistant flaky silver-coated copper powder comprises the steps that flaky copper powder and a complexing agent are added into water to be evenly dispersed, and a water-based copper powder solution is obtained; adding the water-based copper powder solution and a corrosion inhibitor into a water solution containing a reducing agent, and uniformly dispersing to obtain a copper powder reducing solution; a silver-ammonia solution and a stabilizer are added into the copper powder reduction solution for a reduction reaction, silver-coated copper powder particles are obtained, and after precipitation and filtration, the corrosion-resistant flaky silver-coated copper powder is obtained; the stabilizer is obtained by carrying out a quaternization reaction on 3-dimethylamino-1-propanethiol and sodium 3-bromopropane sulfonate. The flaky copper powder and the silver ammonia react under the condition of the specific stabilizer, so that the coating property, the oxidation resistance, the coating uniformity and the compactness of the obtained silver-coated copper powder are effectively improved, and the obtained silver-coated copper powder is efficiently applied to an electromagnetic shielding shell.

The invention relates to the technical field of corrosion-resistant coatings, in particular to a post-treatment method for improving the corrosion resistance of a chemical nickel-plated layer in a plasma environment. Comprising the following steps: preparing composite sol, coating a workpiece, carrying out plasma-assisted curing, and then carrying out heat treatment on an inorganic-organic hybrid coating framework; an inorganic-organic hybrid coating framework firmly combined with a nickel-plated layer is formed on the surface of a chemical nickel-plated workpiece under a low-temperature condition by preparing composite sol and matching with plasma-assisted curing, and rare earth elements are immobilized in situ; the inorganic-organic hybrid coating framework is further condensed through subsequent heat treatment, pore collapse and structural densification are achieved, and therefore the final compact corrosion-resistant coating is formed, and rare earth elements are fixed in the compact corrosion-resistant coating in a chemical bonding mode; therefore, thermal stress and interface stripping risks caused by a thermocuring process are eliminated, and long-acting, stable and reliable protection on a matrix under extremely harsh working conditions is realized.

The invention relates to the technical field of aluminum alloys, in particular to a high-strength aluminum profile and a preparation method thereof. The problems that in the prior art, an aluminum profile is low in mechanical property and insufficient in corrosion resistance are solved. Magnesium, silicon, a copper-cerium alloy and a metal erbium element are added into an aluminum ingot, and melting treatment is carried out step by step, so that a smelted alloy is obtained; the smelted alloy is refined through a refining agent, preliminary die casting, segmented extrusion forming and multi-segment aging treatment are combined, the temperature, time and cooling speed of each process are accurately controlled, and an aging treatment profile is obtained; and zinc deposition treatment is carried out, and the high-strength aluminum profile is prepared by optimizing the zinc deposition process and strictly controlling the temperature and time of primary zinc deposition and secondary zinc deposition and the thickness of a zinc deposition layer. Through the adding of all elements and the synergistic effect of process steps and parameters, the strength and corrosion resistance of the aluminum profile are effectively improved.

One or more precursors can be provided over a surface of a component. A heating element can be provided over the one or more precursors such that the heating element substantially conforms to a shape of the component surface. The precursor(s) can be sintered to form a layer of an environmental-thermal barrier (ETB) coating by subjecting the precursor(s) to a temperature of 500-3273 K for a duration of 10 minutes or less. The temperature can be generated by passing an electric current through the heating element to cause Joule heating of the heating element.

The invention discloses a preparation method of smooth and compact silver-coated copper powder, which belongs to the technical field of conductive powder preparation, and is characterized in that an organic coating layer and an oxide layer on the surface of the copper powder can be effectively removed by carrying out proper acid-base surface activation treatment on the copper powder; then the activated copper powder is added into a protective reagent solution for anti-oxidation protection, the reaction between non-uniform active sites on the copper surface and oxygen in air and liquid is reduced, and it is guaranteed that an interface layer of the copper powder is uniform and free of the local oxidation phenomenon; and subsequently, a sensitization reduction coating method is adopted, so that the smooth low-silver silver-containing coated copper powder with high coating compactness is obtained. The low-silver powder-containing body has the characteristics of excellent oxidation resistance, low thermal gain, low resistivity, good conductivity and the like.

The invention provides a preparation method of a high-performance titanium anode. The preparation method comprises the following steps: pretreating a titanium substrate; the preparation method comprises the following steps: coating a tantalum-containing solution on a titanium substrate, and carrying out drying, pre-sintering and oxidation treatment to form a Ta2O5 bottom layer; wherein the drying temperature ranges from 80 DEG C to 110 DEG C, and the drying time ranges from 8 min to 12 min; the presintering temperature is 450-550 DEG C, and the presintering time is 8-15 minutes; the oxidation treatment temperature ranges from 600 DEG C to 680 DEG C, and the oxidation treatment time ranges from 1.5 h to 2.5 h; the surface of the Ta2O5 bottom layer is coated with a Pt-Ti alloy solution, then sintering is conducted for 10-20 min at the temperature of 500-550 DEG C, and a middle layer is formed; the surface of the middle layer is coated with an Ir-Ta-Sn-Co-Mn solution for 3-5 times, sintering is conducted for 10-15 min at the temperature of 500-600 DEG C after each time of coating, and a surface active layer is formed; wherein the molar ratio of all metal components in the Ir-Ta-Sn-Co-Mn solution is as follows: Ir: Ta: Sn: Co: Mn is equal to 7.16: 4.5: 0.8: 0.8: (0.5-1.2). According to the preparation method of the high-performance titanium anode, through staged sintering, multi-layer component regulation and control and process optimization, the problems of insufficient coating compactness, matrix passivation and low Ir utilization rate are solved, and the technical effects that the strengthening life is larger than or equal to 20 days (40000 A / m), and the bath voltage reduction is larger than or equal to 10% are achieved. The invention further provides the high-performance titanium anode and application thereof.

A device for holding at least one planar substrate (1,2) in an apparatus for non-immersive wet-chemical treatment of the substrate (1,2) comprises a pair of flow guide surfaces (23,24;50,51;88,89) on opposite sides of a space (28;55;93) for accommodating an edge region of at least one substrate (1). The flow guide surfaces (23,24;50,51;88,89) extend in a first direction (-z) to respective edges (25,26;52,53;90,91) and extend in a second direction (y) transverse to the first direction (-z). Each of the edges (25,26;52,53;90,91) bounds a gap (27;54;92) for insertion of an edge region of at least one substrate (1) into the space (28;55;93). A dimension of the space (28;55;93) in a third direction (x) transverse to the first and second directions (-z,y) decreases in the first direction (-z) over at least part of an extent in the first direction (-z) of the space (28;55;93). The device comprises at least one first array (15;44;76) of protruding engagement features and at least one second array (16;45;77) of protruding engagement features, protruding towards each other from first and second engagement feature supports (19;20;47;49;81;84), respectively. The first and second arrays (15,16;44,45;76,77) extend in the second direction (y). The engagement feature supports (19;20;47;49;81;84) are at least partially movable with respect to each other to move the first and second arrays (15,16;44,45;76,77) in the third direction (x). The protruding engagement features are located in the space (28;55;93) at a distance from the edges (25,26;52,53;90,91) in opposite direction (z) to the first direction (-z). The space (28;55;93) is accessible to liquid at a distance from the edges (25,26;52,53;90,91) in opposite direction (z) to the first direction (-z).

The invention relates to silver-coated copper powder for conductive paste and a preparation method and application of the silver-coated copper powder. The preparation method comprises the steps that copper powder is soaked in an acid solution, and pretreated copper powder is obtained after washing; the pretreated copper powder is subjected to ultrasonic treatment in ethyl alcohol or isopropyl alcohol, and copper powder dispersion liquid is obtained; dissolving TGA in water, and adjusting the pH value to 8-9 to obtain a TGA solution; adding the copper powder dispersion liquid into a TGA solution, stirring, washing and drying to obtain TGA-coated copper powder; and adding the TGA-coated copper powder into a reduction solution of a silver nitrate and TGA aqueous solution, stirring for reaction, and carrying out post-treatment to obtain the silver-coated copper powder. According to the preparation method, TGA is adopted as a pre-protection layer of copper powder and a silver ion reduction accelerant, oxidation resistance is achieved through a bidentate coordination structure formed by sulfydryl and carboxyl in thioglycollic acid and copper, silver ions are complexed through carboxyl in thioglycollic acid, the silver ions are directly reduced into silver through sulfydryl, uniform deposition of silver is guided, and the copper powder is prepared. A silver coating layer in the obtained silver-coated copper is compact and uniform, and the conductivity is excellent.

The invention relates to a preparation method of silver-coated copper powder for the electronic industry, in particular to a preparation method of silver-coated copper powder for low-temperature slurry, which comprises the following steps: (1) alkali washing; (2) pickling; (3) organic modification; and (4) chemical silver plating is conducted, filtering, cleaning and drying are conducted after chemical silver plating is completed, and the silver-plated copper powder is obtained. Copper powder replacement is inhibited through surface organic modification, so that the copper powder does not participate in the reaction or does not participate in the reaction slightly, on one hand, copper powder raw material waste caused by the replacement reaction can be reduced, and on the other hand, batch instability caused by the morphology and specific surface area difference of the copper powder can be reduced. The silver-coated copper powder prepared by the method has excellent conductivity, high temperature resistance and silver-copper interlayer binding force, and can meet shearing acting forces such as high temperature and extrusion in the preparation and use process of low-temperature slurry.

The invention discloses a polyether-ether-ketone-based composite material with low reflection and high electromagnetic shielding effectiveness and a preparation method of the polyether-ether-ketone-based composite material, and belongs to the technical field of electromagnetic shielding materials. The problems that an existing electromagnetic shielding material is high in reflection coefficient, insufficient in shielding effectiveness, poor in high temperature resistance and corrosion resistance and difficult to adapt to severe environment service are solved. The composite material is composed of a porous conductive substrate and an asymmetric conductive layer. Wherein the porous conductive substrate is formed by blending a soluble ketimine type polyether-ether-ketone solution and a conductive filler suspension and then carrying out non-solvent induced phase separation and acidification reduction reaction, the electric conductivity is 2.8 * 10 <-4 >-0.1839 S / cm, and the porosity is 80%-90%; the asymmetric conductive layer is plated on the surface of one side of the porous conductive substrate, and the asymmetric conductive layer is made of nickel-phosphorus alloy. The composite material significantly reduces the electromagnetic wave reflection coefficient through an absorption-reflection-reabsorption mechanism, has high electromagnetic shielding effectiveness and excellent high temperature resistance and corrosion resistance, and is suitable for serving in a severe environment.

The utility model relates to the technical field of batteries, and provides a confluence plate, a battery cell and a battery to achieve the purpose that after the confluence plate is welded into a part of the battery cell, the surface of a welding area of the confluence plate makes contact with electrolyte, and the welding area of the confluence plate is not prone to being corroded by the electrolyte. The confluence plate comprises a confluence plate body and a surface aluminum layer, the confluence plate body is a copper layer, and the surface aluminum layer wraps the outer surface of the confluence plate body.

The invention discloses a titanium-based-iridium tantalum oxidation coating anode and a preparation method and application thereof, and belongs to the technical field of anode preparation, and the preparation process of the titanium-based-iridium tantalum oxidation coating anode comprises the steps that a titanium substrate is brushed with a solution containing a tantalum source A, then sintering is conducted, brushing-sintering is repeated, and a tantalum-coated titanium substrate is obtained; the tantalum-coated titanium substrate is brushed with the iridium-tantalum oxidation coating liquid, then sintering is carried out, and brushing-sintering is repeated, so that the tantalum-coated titanium substrate is obtained; the iridium-tantalum oxidation coating liquid contains a tantalum source B, an iridium source and a zirconium source; in the iridium tantalum oxidation coating liquid, the mass ratio of tantalum to iridium is (6-7): (4-5), according to the preparation method provided by the invention, through two times of brushing, the tantalum content in the titanium-based-iridium tantalum oxidation coating anode is more than 5% greater than the iridium content, and when the titanium-based-iridium tantalum oxidation coating anode is used for an alkaline citric acid electroplating system, the decomposition of a complexing agent can be effectively inhibited, the components of the electroplating liquid are maintained to be stable, so that the quality of a plating layer is ensured, and the service life of the plating layer is prolonged. The maintenance cost of the plating solution is reduced and the service life is prolonged.