74results about How to "Precise thickness control" patented technology

The invention discloses a preparation method of a standardized sheet for a thermoelectric test of minerals or mineral materials and alloys, belongs to the technical field of mineralogy, material science and prospecting prediction, and establishes a preparation process of a universal mineral or mineral material and alloy thermoelectric sheet. Covering all semiconductor mineral types or mineral material types such as pyrite, magnetite, graphite and sintered ore; accurate thickness control is achieved through a double-face polishing-loading sheet supporting structure, in-situ testing of the thermoelectricity of minerals or mineral materials and alloys is achieved, and the testing precision is improved; by adopting a conductive adhesive-copper plate composite structure, the interface resistance is reduced, the supporting strength is met, and the requirement of eliminating detection interference is met; residual colloid is thoroughly removed through ultrasonic cleaning, and the insulation effect is avoided; according to the standardized sheet, the hollow aminated phenolic resin nanosphere is used as a conductive substrate and is used for bonding a sample and a copper plate, the contact resistance between the sample and an electrode can be greatly reduced, and the accuracy of test data is improved.

The utility model discloses a sheet thickness adjusting device of a plastic sheet machine, which relates to the technical field of sheet machines, solves the problems of low sheet thickness adjusting accuracy and poor production quality of the existing device, and adopts the following scheme that a fixed frame A is assembled on the top surface of a base. Through the arrangement of a telescopic air cylinder and a limiting rod, the telescopic air cylinder drives a fixing frame B to move downwards, the fixing frame B slides on the limiting rod, the moving stability of the fixing frame B is guaranteed, the distance between the fixing frame B and a fixing frame A is the distance between a lower adjusting roller and an upper adjusting roller, and the thickness of a sheet can be accurately controlled through scale line observation; and meanwhile, through the arrangement of supporting rods and scraping plates, the outer wall of the lower adjusting roller can be scraped by the two sets of scraping plates, the outer wall of the upper adjusting roller can be scraped by the two sets of scraping plates, raw materials are prevented from being adhered to the outer walls of the adjusting rollers, and the production effect and quality of the next set of sheets are guaranteed.

The invention relates to a silicon-based negative electrode material based on metal oxide coating and preparation and application thereof, and a preparation method of the material comprises the following steps: S1, putting a silicon-based material into a solvent for ultrasonic dispersion to obtain a uniform suspension; s2, adding a metal oxide precursor into the suspension obtained in S1, and carrying out hydrolysis or condensation reaction to generate a continuous metal oxide coating layer on the surface of the silicon-based material in situ; and S3, after the reaction is finished, centrifugally separating, washing and drying the obtained product to obtain the silicon-based negative electrode material, namely a target product. Compared with the prior art, the method provided by the invention is simple in process, low in cost and good in repeatability, and the obtained coated silicon material has excellent structural stability and electrochemical performance and has a wide application prospect in high-energy-density lithium ion batteries and all-solid-state batteries.

This invention discloses a continuous conductivity testing bench for lubricating grease and its testing method. The test bench includes a grease pump, a conductive base plate, a heating module, and an upper conductive plate. It can continuously measure the dynamic conductivity of the lubricating grease before and after breakdown and before and after blockage at a preset temperature, calculate the average conductivity during the continuous thickness change process, and conclude that the grease thickness is different when breakdown and blockage occur. It obtains the accurate values ​​of the grease thickness in the test area corresponding to each breakdown and blockage. In the blockage analysis, the volume of the grease to be injected into the test area is calculated by integration. Based on the instantaneous volume flow rate detected by the elliptical gear flow meter, the actual volume of the grease to be injected into the test area is calculated, and the flow rate of the grease pump is adjusted to ensure that the difference between the volume of the grease to be injected into the test area and the actual volume of the grease injected into the test area is within a preset range. This avoids the pressure changes caused by insufficient grease thickness or excessive grease affecting the test accuracy.

This utility model relates to the field of post-printing processing technology, and more particularly to a UV ink fixing device for PVC anti-slip mats. This utility model provides such a UV ink fixing device for PVC anti-slip mats, including a body, guide blocks, a conveyor belt, a motor, a steel roller, a discharge device, magnet two, and magnet one, etc.; the guide blocks are installed inside the body, the conveyor belt is installed on the body, the motor is installed on one side of the body, the motor output shaft is connected to the drive roller shaft of the conveyor belt, the discharge device is movably installed on the body, the steel roller is rotatably arranged between the discharge devices, magnet two is symmetrically installed on the discharge device, and magnet one is movably attracted to magnet two. This utility model uses a rotating knob to drive a threaded rod to move the connecting frame, achieving smooth lifting and lowering of the discharge device, and precisely adjusting the coating height, thus adapting to PVC anti-slip mats of different thicknesses.

A method for manufacturing a semiconductor memory device includes: sequentially forming a lower oxide layer, a word line metal layer, and an upper oxide layer over at least a portion of a memory cell; forming a via through the upper oxide layer, the word line metal layer, and the lower oxide layer to expose a portion of the memory cell; forming a sacrificial pillar in the via; removing the upper oxide layer to expose the top of the sacrificial pillar; sequentially forming a first oxide sidewall, a nitride sidewall, and a second oxide sidewall on the sidewall of the top of the sacrificial pillar; removing the nitride sidewall to form a void; and etching the word line metal layer through the void to form individual word lines. An enhanced self-aligned word line process utilizes different material spacers to precisely pattern the word line metal layer to form multiple word lines with balanced widths.

This utility model discloses a filter element cutting device, comprising: a U-shaped frame, a conveyor internally mounted on the U-shaped frame, a folding cover rotatably mounted on the other end of the U-shaped frame, a folding pressing mechanism fixedly mounted inside the U-shaped frame, the pressing end of the folding pressing mechanism being able to flip and press against both ends between the conveyor and the folding cover to achieve pressing of the conveyed filter element, and an N-shaped frame fixedly mounted on the upper surface of the U-shaped frame, with a laser ranging sensor fixedly mounted inside the N-shaped frame. This application, through the design of the folding pressing mechanism, achieves fully automated operation from conveying, folding, detection, and cutting, reducing manual intervention, improving production efficiency, and lowering labor costs. Simultaneously, the closed-loop thickness detection and control system ensures the stability and consistency of filter element quality, improving the overall product quality.

The utility model relates to the technical field of carbon brush production, in particular to a carbon brush oiling tool which is provided with a horizontal moving unit, a vertical moving unit is arranged on the horizontal moving unit, an oiling unit is arranged on the vertical moving unit, the oiling unit comprises an oil pipe, an oil injection valve and an oiling brush, and an oiling position adjusting unit is arranged on the vertical moving unit. Through linkage control of the horizontal moving unit and the vertical moving unit, it is ensured that the oiling brush can be accurately positioned to the starting point of the carbon brush milling arc face, and continuous and uniform covering of an oil film is achieved through the constant-speed pulling-up action from bottom to top. The oil injection valve and the lifting speed are synchronously adjusted, the oil quantity and thickness can be accurately controlled, and the problem that an oil film is too thick or too thin in traditional manual operation is solved; the oiling position adjusting unit is integrated on the vertical moving unit, so that transverse deviation is supported, carbon brushes of different sizes and radians are adapted, missing coating or uneven coating caused by workpiece tolerance is avoided, and the process compatibility is remarkably improved.

The utility model discloses a quick-opening type ash pipe sealing processing device, which relates to the technical field of pipeline processing, and comprises a pipeline body and a processing base, the side end part of the processing base is provided with a positioning assembly, the positioning assembly comprises a support ring, a driving ring and a flexible toothed belt, the driving ring is internally provided with two gluing assemblies, and the flexible toothed belt is arranged on the support ring. Each gluing assembly comprises a supporting cylinder, guide blocks, pressing wheels, a glue injection head and a flow guide plate, the driving ring can rotate at the side end of the supporting ring, meanwhile, the driving ring drives the two guide blocks to rotate at the same time, the multiple pressing wheels are installed at the two ends of each guide block, and the surfaces of the pressing wheels extrude a pipeline body of a pipeline; and meanwhile, the two guide plates are installed at the tail end of the guide block, the air is guided out through the guide plates, the air is obliquely blown to the surface of the pipeline body through the obliquely-arranged guide plates, dust on the surface of the pipeline body is removed, and the sealing and gluing quality is guaranteed.

The utility model relates to the technical field of shortening machine, disclose a shortening machine for pastry production, including base, the top fixed coupling of base has the support block, the left side fixed coupling of support block has the support rod, the top fixed coupling of support rod has the transmission device, still include: power mechanism, power mechanism includes the support frame fixed connection in the support block top, the inside rotation connection of support frame has the rotary column, the utility model discloses a straight line descending motion of moving block in the limit groove, and the downward slide of sliding sleeve on the outside of convex axle, and then realized the synchronous descent of U -shaped frame and second compression roller, and this linkage design has guaranteed the distance between first compression roller and second compression roller can accurate adjustment, thereby realized the accurate control to dough extrusion thickness, this accurate thickness adjusting capacity, not only has improved the quality and consistency of pastry production, also makes the operation more simple and quick, and the production efficiency has been improved greatly.

The application relates to the technical field of LED, in particular to a high-reliability reverse-polarity red LED chip and a manufacturing method thereof. x The reverse-polarity red LED chip is sequentially provided with a silicon substrate, a metal bonding layer, a silver mirror layer, a dielectric layer, an epitaxial layer, a GaAs contact layer, an N-type electrode, a roughening layer and a SiO2 / SiN x composite passivation layer, three-layer gradient in-situ fusion sealing layer; the three-layer gradient in-situ fusion sealing layer covers the cutting path sidewall of the reverse-polarity red LED chip; the three-layer gradient in-situ fusion sealing layer is sequentially provided with an AuSn-based anticorrosion layer, a TiO2 insulating layer and a SiO2 mechanical protection layer from inside to outside. Through adjustment of the chip structure and cooperation with a laser cutting process, the problems of silver ion migration, electrochemical corrosion, sulfidation corrosion and sidewall microcrack failure are effectively solved, and the long-term service reliability of the chip is greatly improved.

The application discloses a laser ranging four-roller micro-foaming calender and a calendering method thereof, and belongs to the technical field of plastic foamed plate processing equipment. The calender comprises a four-roller calendering unit, a laser ranging unit, a servo adjusting unit and a control system. The plate thickness is detected in a non-contact real-time mode by a laser triangulation ranging sensor, and the servo motor is linked with the PLC control system to realize closed-loop dynamic adjustment of the roll gap. The calendering method adopts multi-channel symmetrical calendering of the upper roller group and the lower roller group and gradient temperature control, so that the plate sequentially completes surface skinning, internal foaming and thickness setting calendering, and the thickness uniformity and the surface quality are effectively improved.

This application provides a composite plate and its preparation method. The method includes composite blank preparation, hot rolling, heat treatment, and plate separation. After grinding one side of the substrate blank and both sides of the cladding blank, a release agent is applied to the side of the cladding blank away from the substrate blank, with the release agent thickness fluctuating ≤0.5mm. Then, the composite blank is assembled in the order of substrate-cladding-cladding-substrate. The total weight of the release agent is W. e 4×10 ‑6 ×CR×L s ×W s ~10×10 ‑6 ×CR×L s ×W s W e The unit is g, CR is the preset total compression ratio for rolling, and L s W is the length of the cladding blank. s This refers to the width of the cladding blank; the length and width are in mm. The thickness of the cladding blank and the cladding steel plate must meet the following formula: ; t cb For the thickness of the base material blank, t cp t represents the target thickness of the substrate in the composite board. sb For the thickness of the cladding blank, t sp The values ​​represent the target thickness of the cladding material in the composite plate, all in mm. a represents -0.2 to 0.2 mm, b represents 1 to 10 mm, and c represents -5 to 5 mm. By controlling the amount of release agent and the billet ratio, the thickness of the cladding material after rolling is made uniform.

This application provides a TOPCon solar cell with improved leakage current and its fabrication method, relating to the photovoltaic field. After phosphorus diffusion, a patterning process is performed on the front edge and central axis of the silicon wafer using a laser, followed by acid washing and alkali washing to obtain an alkali-washed silicon wafer. An Al2O3 thin film is prepared on the front surface of the alkali-washed silicon wafer using plasma ALD, followed by annealing to form an Al2O3 layer. SiO2 is then prepared on the surface of the Al2O3 layer using plasma ALD. x N y Layer; SiH4, CM4 and CH3M gases are introduced, and ALD is used on SiO2. x N y SiN layer surface x M layer; M is a halogen element, SiN x Halogen elements in the M layer move along the path close to SiO₂ x N y One side of the layer to the side away from SiO x N y The content gradient on one side of the layer decreases; electrode printing, sintering, and light injection are performed to obtain TOPCon solar cells with improved leakage current. This can reduce recombination loss and leakage current.

This invention discloses an anti-clogging powder coating suitable for microporous sound-absorbing ceilings. The powder coating is a polyester / TGIC two-component matte powder system. The formulation, by mass percentage, includes 99.8%-99.9% polyester / TGIC two-component matte powder substrate. During use, the coating uses polyester / TGIC two-component matte powder as the substrate and is combined with 0.1%-0.2% hydrophobic fumed silica as a rheology modifier. By precisely controlling the particle size D50 of the polyester / TGIC two-component matte powder substrate to 25-30μm, and utilizing the anti-sagging properties and rheology regulation function of fumed silica, precise control of the coating thickness is achieved during the spraying process. This avoids the shrinkage or clogging of micropores in the microporous sound-absorbing ceiling caused by coating sagging or accumulation. This solves the technical problems of easy clogging and reduced sound absorption effect when traditional powder coatings are used to spray microporous ceilings. After spraying, the micropore diameter retention rate of the ceiling is ≥95%. It is suitable for places with sound absorption requirements such as conference rooms, auditoriums, concert halls, school classrooms, and hospitals.

The invention discloses a high-transparency TPU (thermoplastic polyurethane) hot melt adhesive film composition and a production process thereof, and belongs to the technical field of high polymer materials. The composition comprises a TPU matrix, a polymer modifier and the like. The production process comprises the following steps: synthesis of a four-arm star-shaped polymer modifier, vacuum dehydration of raw materials, high-speed mixing, gradient temperature control extrusion granulation, and gradient melting-rapid cooling curtain coating film formation under nitrogen protection. In order to overcome the defects that an existing TPU hot melt adhesive film is insufficient in transparency, poor in bonding durability and prone to migration of a modifier, star topology modifier design and a dual covalent cross-linking synergistic scheme are provided, molecular-level compatibility of the modifier and TPU is achieved, and finally the hot melt adhesive film high in transparency, high in bonding stability and excellent in processing performance is obtained. The method is suitable for high-end scenes such as optical device fitting.

The utility model discloses an anti-coking, impact-resistant and vibration-resistant adjusting ball valve for coal chemical industry black water, and relates to the field of adjusting ball valves. In coal chemical industry black water treatment, a black water medium has the characteristics of high suspended matter content, high temperature, high alkali content, high corrosion content and high-hardness solid particle content, and abrasion, corrosion, coking jamming and driving failure of traditional valve internals are easily caused. Comprising a fixing shaft, a left valve body, a right valve body, a left valve seat, a right valve seat, a ball body, a valve rod and an executing mechanism, the ball body, the valve seats and valve body flow channels are spray-welded with tungsten carbide layers with the hardness larger than or equal to HRC65, the left valve seat and the right valve seat achieve two-way pre-tightening sealing through spiral springs and the ball body, and scraper type cutting edges are arranged on the sealing faces of the valve seats. The valve rod adopts a large-diameter high-strength design and is in anti-rotation connection with the ball body, and the stuffing box adopts a disc spring load limiting and pressurizing structure. The wear resistance, impact resistance and coking resistance are remarkably improved, bidirectional reliable sealing is achieved, stable driving under the high-torque working condition is guaranteed, the service life of the valve is prolonged, and the valve is suitable for the coal chemical industry black water extreme working condition.

The application discloses a kind of aluminum nitride as medium's capacitance loaded MEMS filter and manufacturing method, method includes: providing silicon substrate;Forming first metal layer on silicon substrate, and it is patterned;Forming dielectric layer on first metal layer and it is patterned;Silicon substrate is coated with photoresist and is patterned, carries out silicon hole etching, forms silicon via by thinning process;Forming patterned second metal layer on the front and back of silicon substrate;The first metal layer is as the lower electrode of capacitor, dielectric layer is as the dielectric layer of capacitor, and the second metal layer is the upper electrode of capacitor, filter resonator, via and back ground metal.End loaded capacitor mode can greatly reduce the volume of filter, the second metal layer is simultaneously as capacitor upper electrode, filter resonator, via and back ground metal, not in need additional process step to make resonator, reduce process step, realize the miniaturization of filter, satisfy SiP integration demand.

The invention provides a chip structure, a chip and a preparation method of the chip structure, and the preparation method comprises the steps: providing a substrate, and depositing a metal layer on one side of the substrate; depositing a first dielectric layer on one side, away from the substrate, of the metal layer; depositing a second dielectric layer on one side, deviating from the metal layer, of the first dielectric layer; etching the second dielectric layer, the first dielectric layer and the metal layer to form a metal reflection part and a metal interconnection part; depositing a third dielectric layer on one side, deviating from the substrate, of the etched structure; performing planarization processing on the third dielectric layer by taking the second dielectric layer as a grinding stop layer; removing the second dielectric layer; the first dielectric layer and the third dielectric layer are combined to form a dielectric layer, the dielectric layer comprises a first area and a second area correspondingly, and the surface of the side, away from the substrate, of the first area is flush with the surface of the side, away from the substrate, of the second area. According to the invention, the thickness of the dielectric layer can be accurately controlled, the thickness uniformity of the chip dielectric layer is effectively improved, and the performance of the chip is improved.

The utility model discloses a limiting plate assembly for a calender, and relates to the technical field of automobile leather processing. The limiting plate assembly for the calender comprises a fixing support and a limiting assembly, guide rollers are arranged on the two sides of the fixing support, the limiting assembly is arranged on the guide rollers, the limiting assembly comprises a two-way threaded rod, threaded blocks and a limiting plate, and the two sets of threaded blocks are installed on the two-way threaded rod in a threaded mode and symmetrically distributed front and back; the guide roller is slidably sleeved with two sets of limiting plates which are symmetrically distributed front and back, and the bottoms of the limiting plates and the tops of the threaded blocks are fixedly installed. Through the arrangement of the limiting assembly, leather is clamped, it is ensured that the leather is kept in the center when entering and exiting the calender, leather deviation is avoided, it can be ensured that the leather is subjected to uniform pressure, and therefore the thickness and quality of the calendered leather are more consistent, frequent adjustment and reworking can be avoided through accurate control over leather centering, and the production efficiency is improved. And the production stability and efficiency are improved.

The invention relates to the technical field of infrared detection, in particular to a polarization infrared chip, a preparation method of the polarization infrared chip and a polarization infrared detector, and the polarization infrared chip comprises a reading circuit, an infrared sensitive layer, an infrared substrate and a metasurface polarization array, the reading circuit is arranged below the infrared sensitive layer, and the infrared sensitive layer is connected with the reading circuit through flip chip bonding; the super-surface polarization array is formed by etching the back surface of the infrared substrate. The infrared substrate is directly used as the base of the metasurface polarization array, so that the focal length of the formed metasurface polarization array is accurate and controllable, the vertical integration precision of the polarization infrared chip can be effectively improved, inclination and high integration errors in the heterogeneous integration process are reduced, and meanwhile diversified design of the metasurface polarization array is facilitated.

A kind of sliding formwork steel bar spacing and concrete cover thickness control device, belong to the technical field of water conservancy and hydropower engineering construction, including positioning angle steel, the positioning angle steel is fixedly connected on jack crossbeam, several positioning blocks evenly arranged are connected on the positioning angle steel along its length direction, positioning hole is opened in the positioning block, the hole wall of the positioning hole is recessed to form recess, several ball bearings are arranged in the recess along its circumferential direction.The positioning angle steel and the positioning hole in the utility model are arranged to accurately control the steel bar spacing and the concrete cover thickness, at the same time, the setting of ball bearing also avoids the steel bar that is inserted into positioning hole from being jammed, to ensure that the quality of sliding formwork construction concrete meets the design standard.

The invention discloses an alternating multilayer polymer foam material and a preparation method thereof. The preparation method comprises the following steps: S1, weighing polystyrene and polymethyl methacrylate; s2, polystyrene and polymethyl methacrylate are prepared into a polymer sheet through multi-layer co-extrusion equipment, the polymer sheet comprises polystyrene layers and polymethyl methacrylate layers which are alternately stacked, the thickness of the polystyrene layers is 50-500 microns, and the thickness of the polymethyl methacrylate layers is 50-500 microns; s3, the polymer sheet is placed in a high-pressure kettle for saturation, after full saturation, a sample is taken out of the high-pressure kettle, foaming is conducted at the foaming temperature, the polystyrene layer forms a first foam hole layer, the polymethyl methacrylate layer forms a second foam hole layer, and the alternate multi-layer polymer foam material is prepared.

The invention belongs to the technical field of all-solid-state electrolyte materials, and discloses an all-solid-state electrolyte membrane with a three-layer structure, a sulfide intermediate electrolyte layer is prepared through slurry wet coating, and ultrathin elastic electrolyte layers are formed on the two sides of the sulfide intermediate electrolyte layer through spraying or spin coating, so that the preparation of the all-solid-state electrolyte membrane is realized; the all-solid-state electrolyte membrane has the composite structure characteristics of high ionic conductivity of a sulfide solid electrolyte and high flexibility of an ultrathin elastic electrolyte layer, has excellent interface adaptability and room-temperature ionic conductivity, and can remarkably reduce interface impedance and inhibit a space charge layer effect; and the all-solid-state battery is endowed with higher cycling stability and rate capability, and has important power battery and energy storage industrialization application value.

A high-speed and high-stability reverse coating surface treatment process and device are provided herein, which comprises the following steps: S1, longitudinal stretching of a film, and surface corona treatment after the longitudinal stretching is completed; S2, single-sided or double-sided, single-layer or multi-layer reverse surface coating of the film subjected to the surface corona treatment; and S3, transverse stretching after the coating is completed. The on-line normal pressure cavity reverse coating processing mode can change the performance of the film surface after the on-line surface treatment of the film, can enhance the adhesion of the aluminum layer or ink of the aluminum printing composite product, and can meet the requirements of various high-performance products after the aluminum printing composite. In the reverse coating process, the precise control of the coating thickness can be realized through the adjustment of the scraper type liquid inlet assembly, the bubbles possibly generated on the film surface can be extruded and broken through the negative pressure adsorption device, so that the stability and uniformity of the overall coating are maintained, and the high-speed coating is realized.

The application discloses a preparation method of an energy-saving and environment-friendly composite material and belongs to the technical field of high-temperature-resistant ceramic matrix composite materials. In the application, hyperbranched polyborate is used as a high-carbon-sacrificial-layer precursor, and a four-step process of "fiber surface coating-pyrolytic carbonization-matrix densification-high-temperature oxidation burn-off" is adopted to build a uniform and controllable nanoscale escape type interface between alumina fibers and an oxide matrix. The application solves the problems of weak bonding force, uneven thickness and poor interface load transfer capacity of a traditional carbon coating, and the prepared composite material has high strength, high toughness and good high-temperature stability, and the process is simple, energy consumption is low, the environment is friendly, and the application is suitable for industrial production.

The invention discloses stainless steel wire straightening, calendering and automatic winding equipment which comprises a rack and further comprises a steel wire coil pay-off mechanism, a first tension guide wheel mechanism, a stress straightening mechanism, a calendering mechanism, a second tension guide wheel mechanism, a wire arranging wheel mechanism and a flat wire winding mechanism which are arranged on the rack. The steel wire coil pay-off mechanism is used for outputting a whole coil of stainless steel wires; the tension guide wheel mechanism I is used for adjusting tension and guiding the steel wire to be conveyed to the stress straightening mechanism; the stress straightening mechanism is used for circumferentially twisting the conveyed steel wire so as to release the multi-dimensional stress of the steel wire; the calendaring mechanism is used for calendaring the steel wire subjected to stress straightening into a flat shape; the second tension guide wheel mechanism is used for adjusting tension and guiding the rolled flat steel wire to be conveyed to the wire arranging wheel mechanism. The wire arranging wheel mechanism is used for guiding the steel wire to be wound neatly and tightly in the winding process. And the flat wire winding mechanism is used for winding the calendered flat steel wire.

The invention discloses a porous copper foil taking an aluminum foil as a cathode carrier and a preparation method and application thereof, and the preparation method comprises the following steps: preparing an electrolyte: taking deionized water as a solvent of the electrolyte, and containing copper sulfate, sulfuric acid, chloride ions, SPS (Sulfonyl Phosphate Sulfonate), PEG (Polyethylene Glycol) and collagen; electrode assembly: putting a titanium plate as an anode and an aluminum foil as a cathode into the electrolytic cell, wherein the titanium plate and the aluminum foil are relatively arranged in parallel; and electrolytic deposition is conducted, specifically, direct current is introduced into the electrolytic cell for electrochemical deposition, the electrolysis temperature is controlled to be 30-60 DEG C, the current density is 10-50 A / dm, a stirring device is adopted to stir electrolyte in the electrochemical deposition process, the stirring speed is 50-300 r / min, and the porous copper foil is directly deposited on the surface of the aluminum foil cathode. The preparation method has the beneficial effects that accurate control of the thickness, the pore diameter and the porosity of the porous copper foil is realized through coordinated regulation and control of electrolyte components and process parameters.

This utility model discloses a powder-spreading device for metal-based dispersed solid self-lubricating material sheets, comprising: a base with an electromagnetic chuck mounted thereon; two guide rail structures mounted on the base, each with a ball bearing slider slidably mounted on its outer circumferential surface; and a fixing plate connected to the two ball bearing sliders. A scraper is provided between the fixing plate and the electromagnetic chuck, allowing for height adjustment. The scraper is connected to the fixing plate via an adjusting element. Adjusting the distance between the scraper and the sheet material allows for synchronous adjustment of the scraper by adjusting the height of the adjusting element. This utility model features a simple structure, combining the electromagnetic chuck for sheet material fixation with an adjustable scraper structure. This achieves stable sheet material fixation, precise powder layer thickness control, and simple and safe operation during powder spreading. It also effectively suppresses dust generation, improves powder spreading quality and production efficiency, and has good practicality and industrial application prospects.