2568 results about "Metal substrate" patented technology

The invention relates to a self-repairing anti-corrosion water-based paint applied to the field of paint compositions, which is prepared by the following steps: firstly, preparing a self-repairing microcapsule encapsulated with a self-repairing agent and a corrosion inhibitor, and then uniformly dispersing the self-repairing microcapsule into water-based base resin under a low-shear condition; the prepared coating can be applied to the surface of a pretreated metal base material in a brush coating, spray coating or blade coating mode and the like, a micron-sized anti-corrosion coating is formed after curing, under the normal condition, the microcapsules are placed in the coating in a standing mode and do not work, when scratches occur, the self-repairing microcapsules are broken and play a role, and the corrosion resistance of the coating is improved. The self-repairing agent rapidly fills and heals the damaged part of the coating to form a new barrier layer, the corrosion inhibitor forms a protective film on the exposed metal surface to inhibit the corrosion reaction, and the synergistic mechanism can effectively delay the corrosion diffusion of the scratched part, so that the protection integrity of the coating on the base material is maintained, and the service life of the coating is prolonged. And the coating can be suitable for metal structure protection in severe environments such as ocean climate, high-humidity and high-salt environments, acid rain regions, chemical environments and the like.

The invention relates to the field of precise driving and positioning, in particular to a multi-mode bidirectional movement rotary piezoelectric motor. Comprising a base, a rotor mechanism, a stator mechanism and a pre-tightening mechanism, the stator mechanism comprises a flexible metal oscillator connected to the pre-tightening sliding block. The flexible metal oscillator comprises a diamond frame of a sheet structure and an elastic metal substrate connected between a set of opposite angles in the diamond frame. The two groups of piezoelectric ceramic pieces are symmetrically fixed on the same side surface of the elastic metal substrate; the motor further comprises a first driving foot and a second driving foot which are fixed to the flexible metal vibrator, the first driving foot and the second driving foot are fixed to the two adjacent corners of the rhombic frame body respectively, and the first driving foot and the second driving foot make contact with the inner ring of the rotor bearing. According to the technical scheme, through the asymmetric structural design, the rhombic flexible metal oscillator can generate two working modes, so that the motor realizes bidirectional rotation under the condition that the voltage and the structure are not changed.

The invention discloses a dual-frequency / broadband switchable dynamic tuning metamaterial terahertz absorber which comprises M * N terahertz absorption units of a multi-layer structure, the M * N terahertz absorption units of the multi-layer structure are distributed in an M * N two-dimensional mode, and M and N are positive integers. Each terahertz absorption unit with the multi-layer structure comprises a metal substrate, a dielectric layer and a resonance layer which are sequentially arranged from bottom to top; the dielectric layer and the metal substrate are square and have the same side length; the resonance layer comprises a single-layer graphene layer with a hollow cross, and a solid cross-shaped vanadium dioxide layer is embedded in the hollow part of the single-layer graphene layer with the hollow cross; and the appearance of the single-layer graphene layer with the hollow cross is cross-shaped. The absorber can be dynamically tuned, has the characteristic of polarization insensitivity, and can keep stable absorption in an incidence angle range of 0-60 degrees. The invention further discloses a preparation method of the dual-frequency / broadband switchable dynamic tuning metamaterial terahertz absorber.

Methods and systems for coating metal substrates are provided. The methods and systems include sequential application of low flow and high flow powder coatings followed by a single heating step to provide a cured coating. The methods and systems include a marker that allows coating uniformity to be monitored and assessed during application. The described methods provide coatings with optimal surface smoothness and edge coverage.

The invention relates to environment-friendly hydrophobic ink and a preparation method thereof, and belongs to the technical field of water-based ink. A copolymerization modifier capable of being combined in a water-based polyacrylate emulsion in an initiation polymerization mode in the stage of preparing the modified water-based polyacrylate emulsion is prepared, and an o-hydroxy aromatic ketone structure in the copolymerization modifier can endow water-based ink with lasting ultraviolet absorption performance; the trifluoromethyl structure can reduce the surface energy of the water-based ink, and the benzimidazole ring structure can form stable coordinate bonds with metal ions, so that the bonding performance of the water-based ink and a metal substrate is enhanced; when the copolymerization modifier is used for modifying the water-based polyacrylate emulsion, the long-term performance, the hydrophobic and oil-resistant performance and the adhesion performance on the surface of a metal base material of the finished water-based ink can be effectively improved.

The invention relates to an SPnT surface-mounted microwave mechanical switch, and relates to the technical field of microwave switches, the microwave mechanical switch comprises a metal substrate, a plurality of micro coaxial transmission lines are arranged in the metal substrate, the length direction of the micro coaxial transmission lines is arranged along the thickness direction of the metal substrate, and the two ends of the micro coaxial transmission lines penetrate through the metal substrate; the radio frequency communication mechanism comprises a plurality of radio frequency reeds, one radio frequency reed is correspondingly arranged between every two adjacent micro coaxial transmission lines, the radio frequency reeds and the metal substrate are arranged in parallel at intervals, and linkage pieces are arranged on the radio frequency reeds; the electromagnetic driving mechanisms and the radio frequency reeds are arranged in a one-to-one correspondence mode, the electromagnetic driving mechanisms are connected with the corresponding linkage pieces, and the electromagnetic driving mechanisms are used for driving the radio frequency reeds to be in lap joint with the two corresponding micro-coaxial transmission lines. The microwave mechanical switch provided by the invention can be suitable for application scenes with relatively high requirements on high-frequency performance.

The invention discloses a super-smooth, anti-corrosion and anti-coagulation hydrogel composite coating on the surface of a medical instrument as well as a preparation method and application of the super-smooth, anti-corrosion and anti-coagulation hydrogel composite coating, and the super-smooth, anti-corrosion and anti-coagulation hydrogel composite coating is a surface hydrogel composite coating formed by taking N-(3, 4-dihydroxyphenethyl)-2-benzoylbenzamide (BPDA) as a primer and grafting a hydrophilic polymer on the primer. BPDA is deposited on the surface of the substrate, then hydrophilic monomer surface graft polymerization is initiated by light, and a hydrogel coating is constructed on the surface of the BPDA substrate. The BPDA primer provides excellent corrosion resistance, the corrosion rate of a metal substrate is effectively reduced, and benzophenone derivatives with photoreaction activity on BPDA molecules can mediate firm combination of the hydrogel layer; after meeting water, a stable and compact hydrated layer is formed, the super-lubricating property is achieved, adhesion of protein and cells can be remarkably inhibited, and thrombus formation is effectively prevented. The anti-corrosion and anti-blood coagulation coating has excellent anti-corrosion and anti-blood coagulation properties, and is widely applicable to anti-blood coagulation and anti-corrosion surface modification in the fields of medical instruments and the like.

The invention discloses a preparation method of a metal organic framework modified fluorine-free super-amphiphobic coating, and belongs to the technical field of super-amphiphobic coatings. According to the technical scheme, the method comprises the steps of preparation and modification of a metal organic framework and formation of a fluoride-free super-amphiphobic coating. Adding a metal oxide and nano silicon dioxide particles into a polyacrylic acid solution to form spherical particles; enabling the spherical particles to react with imidazole ligands to obtain metal organic framework particles with porous spherical structures, and wrapping nano silicon dioxide particles in the metal organic framework particles; modifying the metal organic framework particles by using a silane coupling agent; the preparation method comprises the following steps: firstly, attaching modified metal organic framework particles to the surface of a metal matrix, then attaching fluorine-free alkyl silane to the surface of the metal matrix, and heating and curing to obtain the fluorine-free super-amphiphobic coating. The fluorine-free super-amphiphobic coating is applied to the aspect of a metal surface super-amphiphobic coating, and the problems that an existing fluorine-free super-amphiphobic coating is poor in oleophobic and hydrophobic performance and poor in durability are solved.

The invention discloses a silicon carbide power module packaging structure with low thermal resistance and low stress, and belongs to the technical field of semiconductor devices. The packaging structure comprises a metal substrate; the insulating ceramic layer is arranged on the metal substrate; the circuit layer is arranged on the insulating ceramic layer; the lower surface of the silicon carbide chip is connected with the circuit layer through a first interface layer; the composite heat dissipation stress buffer layer is arranged on the upper surface of the silicon carbide chip through a second interface layer; the copper clamp is connected with the upper surface of the composite heat dissipation stress buffer layer through a third interface layer; and the composite heat dissipation stress buffer layer is made of a copper-graphite composite material. According to the invention, the junction temperature of the silicon carbide chip can be greatly reduced, the overall thermal resistance is reduced, the surface stress of the chip is reduced, the warping phenomenon of the chip in the working process is effectively improved, and the long-life reliability of the power module under the long-term thermal cycle working condition is ensured.

Various embodiments of the present disclosure are directed towards an integrated chip (IC). The IC includes a substrate. The substrate includes a metal layer, a device layer disposed over the metal layer, and an insulating layer disposed vertically between the metal layer and the device layer. A semiconductor device is disposed on the device layer. An interlayer dielectric (ILD) layer is disposed over the semiconductor device and the substrate.

A sheet metal substrate (1) for use in elevators, comprising: a single body (2) extending from a top side (2a) to a bottom side (2b) and from a left side (2c) to a right side (2d), in which the edges (3) of the top side (2a) and the bottom side (2b) and the edges (3) of the left side (2c) and the right side (2d), as reinforcement, are bent backwards and inwards so as to define, for each side, an inner recess (4) extending along the corresponding side (2a, 2b, 2c, 2d); at least one reinforcement (10) of a first type extending longitudinally and attached to an intermediate region of the rear side (2f) of the body (2); at least two reinforcements (20) of a second type, which extend longitudinally and are arranged at least partially in the inner recesses (4) of the left side (2c) and the right side (2d), respectively; at least one reinforcement (30) of a third type, which is formed transversely and is arranged at least partially in the inner recess (4) of the top side (2a).

The invention relates to the technical field of metal material coatings, in particular to a PVD composite coating and a preparation method thereof. The preparation method comprises the following steps: pretreating a metal matrix to obtain a pretreated matrix; carrying out magnetron sputtering deposition on the surface of the pretreated matrix by using a composite target material, carrying out plasma spraying and laser texturing for multiple times, and repeating the process to form a composite coating crude product containing a third rare earth doped high-entropy alloy coating; the composite coating crude product is subjected to post-treatment, and the composite coating is obtained; wherein the composite target material is AlCoCrFeNi-Y, and the composite oxide comprises aluminum oxide, titanium oxide and cerium oxide. According to the preparation method, the bonding strength, hardness and strength of the composite coating can be remarkably improved through magnetron sputtering deposition of the rare earth doped high-entropy alloy coating, plasma spraying formation of the composite ceramic coating with the gradient content, laser texturing treatment, alternate construction of multiple layers of coatings and the like in combination with elaborately selected materials with low expansion coefficients.

The invention relates to a method for manufacturing a carbon oil filled single-layer metal substrate, which comprises the following steps of: cutting a metal substrate, and providing the metal substrate with a preset size; performing first-time drilling processing, performing back drilling processing on the metal substrate to form a grounding hole, and synchronously processing a first positioning hole for positioning an outer-layer circuit; filling holes with carbon oil; curing treatment: baking the metal substrate filled with the carbon oil; manufacturing an outer layer circuit pattern; drilling for the second time, namely processing a second positioning hole for carbon oil printing positioning on the metal substrate; carbon oil printing, wherein carbon oil printing operation is carried out based on the second positioning hole; and a post-treatment process: carrying out subsequent treatment on the metal substrate subjected to carbon oil printing to obtain a finished product of the metal-based circuit board. The metal substrate is subjected to processing operations of secondary drilling and secondary carbon oil printing, so that accurate positioning can be realized, and deviation of the circuit board caused by telescopic deformation after circuit manufacturing etching is prevented.

The invention discloses a coating, a preparation method and application, and relates to the technical field of anticorrosive coatings. A dry film of the coating comprises 0.1 wt%-6wt% of a lamellar filler; the lamellar filler is prepared by loading magnetic nanoparticles on the surfaces of two-dimensional nanoparticles and coating a layer of high-molecular polymer. After the coating forms a film, a specific magnetic control orientation curing method is matched, so that high dispersion stability and planar orientation arrangement of the two-dimensional nano filler in a resin matrix are realized, and corrosion of water and oxygen to a base material can be effectively blocked. When the thickness of the coating dry film is only 1-2 microns, the coating dry film still has no obvious corrosion phenomenon after being subjected to a neutral salt spray test for 2000 hours. The metal base material with the thin coating thickness has heat conductivity, corrosion resistance and weather resistance, the preparation process is simple, the cost is low, and the metal base material has extremely high market application value.

The invention provides a preparation method of a fusing composite belt, which comprises the following steps: providing a first metal base material, forming a first groove in a first side of the first metal base material and extending along a second direction, forming a second groove in a second side of the first metal base material and extending along the second direction, and providing a second metal base material and extending along the second direction, the melting point of the second metal base material is lower than the melting point of the first metal base material, the width of the second metal base material arranged in the first groove in the third direction is smaller than the width of the first groove in the third direction, and the second metal base material is connected in the first groove and the second groove; and second-time compounding is conducted, specifically, the first side and the second side are extruded at the same time, so that the second metal base material is in interference fit with the interior of the first groove and the interior of the second groove. According to the preparation method of the fusing composite belt, the processing efficiency of the metal composite belt can be improved while deformation and fracture of the metal composite belt are effectively prevented.

The invention belongs to the technical field of wear-resistant coatings, and particularly relates to a wear-resistant coating for a metal plate of a compressed garbage truck and a preparation method of the wear-resistant coating. The invention aims to solve the problem that an existing coating for the metal plate of the garbage truck is difficult to keep good protection performance under corrosion and abrasion. The preparation method comprises the following steps: carrying out pre-reaction grafting modification on epoxy resin and amine-terminated polyether to obtain an epoxy prepolymer; alpha-aluminum oxide and barium sulfate are mixed, dispersed, ground and subjected to surface activation, and a basic filler is obtained; adding a mica filler into the basic filler, and shearing and mixing to obtain a composite filler; mixing the epoxy prepolymer with a phosphate auxiliary agent to obtain a primer; dispersing and mixing the epoxy prepolymer and the composite filler to obtain a functional coating; after a metal base material is subjected to sand blasting treatment, primer is pre-sprayed on the surface of the metal base material, and then functional paint is covered and sprayed to obtain the wear-resistant coating. The wear-resistant coating prepared by the invention can keep good protection performance under corrosion and wear, and has high application value.

The invention provides a laser polishing device combining gas protection and substrate heat dissipation and a using method. The device comprises a focus lens (1), a laser beam (2), a to-be-polished sample piece (3), a gas nozzle (4), a gas pipe (5), a high-pressure gas cylinder (6), a dust collector (7), a cooling liquid level (8), a metal substrate (9), an objective table (10), a water tank (11) and a laser (12). The invention further relates to a using method of the device. A micro-nano coarse structure is formed on the surface of the metal substrate through chemical etching, electrochemical etching or laser etching and the like, then a hydrophilic oxide layer is introduced through oxidation treatment or plasma treatment, and the super-hydrophilic performance of the metal substrate is further enhanced. The device has excellent liquid cooling capacity, gas protection performance and oxidation resistance, heat can be efficiently conducted and dissipated in the laser polishing process, the temperature uniformity of the surface of a sample is ensured, and overheating and oxidation phenomena are prevented.

The invention relates to the technical field of functional materials, and discloses a bionic hydrophobic anti-corrosion coating construction method which comprises the following steps: S1, substrate pretreatment: performing ultrasonic cleaning on a metal substrate to remove surface oil stains and oxides; s2, laser-electrochemical composite texturing: manufacturing a micron-nano hierarchical structure on the surface of the base material by adopting femtosecond laser, and then growing a metal organic framework layer on the nano structure in situ by adopting an electrochemical method; s3, plasma activation: bombarding the surface of the metal organic framework layer by adopting Ar / O2 mixed plasma; s4, carrying out gradient fluorosilane grafting; s5, filling the dynamic covalent network; and S6, roll-to-roll continuous coating is carried out. Through a laser-electrochemical composite texturing technology and a gradient fluorosilane grafting technology, the problems that a traditional hydrophobic coating is single in structure and poor in binding force are solved, and the effects that a micron-nano hierarchical structure is constructed on the surface of a metal base material, molecular gradient arrangement is formed, the hydrophobic performance is improved, and the interface binding strength is enhanced are achieved.

The invention discloses a heat dissipation substrate and a preparation method and application thereof.The preparation method of the heat dissipation substrate comprises the following steps that a metal substrate body is provided, a groove is machined in the metal substrate body, the groove is filled with a composite heat conduction material, then a cover plate matched with the groove is additionally arranged, and a green body is obtained; the green body is subjected to hot pressing sintering at the temperature of 600-1150 DEG C, so that the composite heat conduction material is converted into a compact sintering body, the grooves are deformed to be just matched with the compact sintering body, a cooked blank is obtained, and then the surface of the cooked blank is ground. According to the preparation method, internal gaps are reduced through the pressing effect of the cover plate, the density of the composite heat conduction material is improved, then the dense sintering body is formed through hot pressing sintering, the dense sintering body and the metal substrate body are fused into a whole, and finally the integrated heat dissipation substrate is obtained. The prepared heat dissipation substrate has good heat conductivity and heat dissipation performance, and can be widely applied to efficient heat dissipation of various power devices.

The invention discloses a VO2-based polarization modulator, a polarization characteristic analysis method and a modulation method, and belongs to the field of optical devices, the VO2-based polarization modulator comprises a metal substrate layer, a Si dielectric layer and a metasurface unit periodically arranged at the top end of the Si dielectric layer, and the metasurface unit is of a chiral structure formed by compounding VO2 and metal; each metasurface unit comprises a middle structure composed of a first middle metal frame and a second middle metal frame and side metal strips arranged on the two sides of the middle structure, and VO2 is embedded in the middle positions of the opposite sides of the first middle metal frame and the second middle metal frame. Metal protrusions are connected to the middle positions of the opposite sides of the first middle metal frame and the second middle metal frame. By adopting the VO2-based polarization modulator, the polarization characteristic analysis method and the modulation method, the polarization state of incident light can be adjusted by the metasurface by adjusting the conductivity of vanadium dioxide, and a dynamic tunable function is realized.

A transparent wideband microwave absorber unit cell, a transparent wideband microwave absorber and a method of forming a transparent wideband microwave absorber, include a metal substrate, a first layer of glass attached to the metal substrate and having a first pattern of indium tin oxide (ITO) configured as a square loop centered about a central vertical axis and a second pattern of ITO including four equidistant square patches, a second layer of glass attached to the first layer of glass and having a third pattern of ITO configured as a dipole having a cross shape with a center axis coaxial with the central vertical axis, and a third layer of glass attached to the second layer of glass and having a fourth pattern of ITO configured as five circular patches, with a first circular patch located coaxially with the central vertical axis and four equidistant circular patches.

The invention discloses a coating for improving the paint adhesion capability of a metal part of a distribution box, and the coating is prepared by the following steps: depositing a first oxide layer on the metal surface, the first oxide layer comprising Zn element and Ce element; a second oxide layer is deposited on the surface of the first oxide layer, the second oxide layer comprises a Zn element and a Ce element, and the molar ratios of the Zn element and the Ce element of the first oxide layer and the second oxide layer are different; a third oxide layer is deposited on the surface of the second oxide layer, and the third oxide layer comprises a Zn element and a Dy element; and a fourth oxide layer is deposited on the surface of the third oxide layer, the fourth oxide layer comprises a Zn element and a Dy element, and the molar ratios of the Zn element and the Dy element of the third oxide layer and the fourth oxide layer are different. The coating provided by the invention can improve the adhesive ability of the paint to a metal substrate.

The invention discloses a method for preparing a sulfur-doped nickel hydroxide-based self-supporting electrolyzed water anode, and belongs to the technical field of preparation of electrolyzed water catalytic electrodes, and the method comprises the following steps: S1, preparing strong oxidizing salt, thiourea and transition metal salt into an active solution; s2, pretreating the nickel-containing metal substrate to obtain a precursor; and S3, immersing the precursor in an active solution for ultrasonic impregnation, and performing in-situ oxidation to prepare the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode. According to the method for preparing the sulfur-doped nickel hydroxide-based self-supporting electrolytic water anode, an oxidizing agent-thiourea-transition metal salt synergistic reaction system is adopted, an ultrasonic-assisted technology is combined, and a high-performance catalytic layer is directly grown on the surface of the metal substrate in situ at room temperature; the invention aims to synchronously realize high catalytic activity, excellent stability and macro preparation of the electrode and fundamentally solve the core pain points of long process, high energy consumption, difficulty in amplification and the like in the prior art.

The invention belongs to the technical field of coatings, and provides an environment-friendly solvent-free coating composition for a metal surface and a preparation method of the environment-friendly solvent-free coating composition. According to the coating composition, through the synergistic effect of the fluorine-containing polymer, the fluorinated polyester and the modified polyurethane, the corrosion resistance and the environmental stability of a coating are improved. Firstly, perfluoromethyl vinyl ether and triethanolamine react under the action of a catalyst to prepare a fluorine-containing polymer, and a three-dimensional cross-linked network structure of the fluorine-containing polymer endows a coating with hydrophobicity and chemical inertness; secondly, fluorinated polyester is prepared through free radical polymerization, and the surface energy is reduced through a perfluorinated chain segment; finally, modified polyurethane is prepared through polycaprolactone glycol, single-terminal dihydroxyl polydimethylsiloxane and the like, the surface energy is reduced through a silicon-oxygen chain segment of the modified polyurethane, and the oxidation resistance is improved through a thioether bond. The coating composition shows excellent water resistance, oxidation resistance and chemical corrosion resistance, has excellent mechanical property and adhesive force, and is suitable for protecting a metal substrate in a severe environment for a long time.

The utility model discloses a camping lamp which comprises a top cover and a light-transmitting lampshade connected with the bottom of the top cover, the middle of the top of the top cover extends upwards to be provided with an outer protruding part, and the top cover is provided with an outer surrounding step surrounding the outer protruding part. An inner ring step is arranged in the top cover; the wall body of the inner ring step and the wall body of the outer ring step are jointly provided with a plurality of heat dissipation holes distributed in a circumferential mode in a penetrating mode, a metal base plate is tightly attached to and fixed to the inner ring step, a plurality of LED lamp beads are fixed to the lower surface of the metal base plate, and a wire hole is formed in the middle of the metal base plate. According to the camping lamp, the LED lamp is directly arranged on the metal substrate for direct heat conduction, so that the heat dissipation efficiency is improved.

The invention relates to the field of semiconductor lasers, and discloses a vertical cavity surface emitting laser based on a composite metal substrate and photonic crystals, which comprises a CIC composite metal substrate, a GaAs buffer layer, a lower n-type DBR, an n-type contact layer, a multi-junction cascade active region, a p-type contact layer and an upper p-type DBR which are sequentially arranged from bottom to top, a plurality of two-dimensional photonic crystals are etched in the light emitting direction of the upper layer p-type DBR; the thermal stability and reliability of the device under a high-power continuous working condition are effectively improved, stable single-mode output is realized, light field limitation is enhanced, light beam quality is improved, array and on-chip integration are facilitated, the problem of low efficiency of a 650nm red light laser in the aspect of single-mode output of a base VCSEL is effectively solved, and the device has a wide application prospect. The method has a good application prospect and a wide application range.

The invention belongs to the technical field of Raman spectrum, and relates to a gold nano array structure, a preparation method thereof and application of the gold nano array structure in SERS (Surface Enhanced Raman Scattering) trace detection. The preparation method comprises the following steps: dropwise adding a PDMS curing liquid on the surface of a first gold nanoparticle film taking a PVP film as a substrate, heating until PDMS is cured, cooling to a second temperature, removing PVP, carrying out gold evaporation, then heating to a third temperature to form a gold nano array with consistent gap size, dropwise adding a PVP solution on the surface, and tearing off the PVP film after the PVP solution is cured into the PVP film, so as to obtain the gold nano array with the uniform gap size. And the PVP thin film with the gold nano array is obtained and attached to a non-metal substrate, PVP is removed, and the gold nano array structure is obtained. According to the preparation method, hot spot distribution of the gold nano array structure can be optimized, the uniformity of hot spots can be improved, gaps of the gold nano array structure can be precisely regulated and controlled by adjusting the third temperature, the enhancement effect of the nano structure can be optimized in different detection environments, and various practical application requirements are met.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention relates to the technical field of OLED (Organic Light Emitting Diode) manufacturing process etching processes, in particular to a silver etching solution for an OLED manufacturing process as well as a preparation method and application of the silver etching solution. The silver etching liquid comprises nitric acid, phosphoric acid, a buffer agent, a metal ion chelating agent and an ionic liquid inhibitor, the ionic liquid inhibitor comprises 1-butyl-3-methylimidazole phosphate, the metal ion chelating agent is selected from at least one of pyromellitic acid, diethylenetriamine pentaacetic acid and ethylenediamine tetramethylene phosphoric acid, and the buffer agent is selected from at least one of sodium chloride, sodium chloride and sodium chloride. The buffering agent comprises acetic acid, and all the components are prepared according to a specific mass ratio. The etching solution can balance the etching rate of silver and indium tin oxide, avoid silver residues and black spot defects, prolong the service life of the solution, reduce the use of a volatile buffer agent, adapt to the OLED fine manufacturing process, improve the product yield and reduce the production cost, and is suitable for etching of a metal substrate in the OLED manufacturing process.

The invention discloses a preparation method of a WC reinforced composite coating. The preparation method comprises the following steps: uniformly mixing ZrO2-WC composite powder with nickel-based alloy powder to obtain raw material powder; the density of the ZrO2-WC composite powder is similar to that of the nickel-based alloy powder, and the ZrO2-WC composite powder is a core-shell structure particle formed by coating WC particles with ZrO2; and cladding the raw material powder on the surface of a metal substrate by adopting a laser cladding method to obtain the WC reinforced composite coating. On one hand, the problems of decarburization and burning loss of WC in the laser cladding process are effectively avoided through the protection effect of ZrO2 with great heat generated by coating the outside of the composite powder; in addition, the density of the composite WC reinforced powder is close to that of the parent phase of the coating, the problem that the WC reinforced phase sinks and segregates in a laser molten pool due to the fact that the density difference between the conventional WC reinforced phase and the parent phase is too large can be solved, and therefore the high-performance composite coating with the WC reinforced phase free of decarburization and burning loss, uniform in distribution and free of cracks is obtained.