42results about How to "Reduce surface defects" patented technology

This invention discloses a manufacturing process for composite 7-series aluminum alloy sheets. The composite 7-series aluminum alloy sheets are formed by laminating and rolling multiple layers of 7-series aluminum alloy sheets and multiple layers of 1-series aluminum alloy connecting plates. The 7-series aluminum alloy sheets are composed of the following components by weight percentage: Si: ≤0.22%, Cr: ≤0.23%, Fe: ≤0.35%, Cu: 2.0-3.5%, Mg: 3.5-4.5%, Zn: 6.5-10.0%, Ti: 0.015-0.2%, Zr: 0.05-0.15%, rare earth cerium alloy: 0.015-0.05%, total impurities ≤0.1%, and the remainder being aluminum. This invention uses a lamination method to roll multiple layers of 7-series aluminum alloy sheets and multiple layers of 1-series aluminum alloy connecting plates, which effectively improves plasticity, toughness, and strength. Compared with existing single 7-series materials, it has higher material strength, better impact resistance and weldability, can adapt to corrosion resistance in complex environments, and extends service life.

The invention provides a multi-component thin film evaporation film thickness monitoring and adjusting device and method and application, the multi-component thin film evaporation film thickness monitoring and adjusting device comprises a conveying module used for conveying a substrate so as to deposit a film layer on the moving substrate through a first evaporation source and a second evaporation source, the conveying module is provided with a position sensing module, and the position sensing module is used for sensing the position of the film layer on the moving substrate through the first evaporation source and the second evaporation source; a trigger signal is generated when the substrate enters the set area; the first film thickness monitoring module is used for acquiring the deposition speed of the first evaporation source and the thickness of a film layer deposited on the substrate; the second film thickness monitoring module is used for acquiring a reflection spectrum of the second evaporation source in a set area; and the control module is used for obtaining the film thickness according to the reflection spectrum of the second evaporation source through an inversion algorithm, and independently feeding back and controlling the real-time evaporation working condition. The thickness of materials with different evaporation rates is subjected to differential parallel monitoring, a closed-loop feedback system is formed, the film thickness monitoring accuracy is improved, and long-time operation of monitoring work is guaranteed.

This invention discloses a method for reusing negative electrode graphite from waste lithium batteries, comprising the following steps: stripping graphite from the current collector to obtain waste graphite; mixing and grinding the waste graphite, sublimed sulfur, and red phosphorus to obtain a mixed powder; placing the mixed powder in an inert gas atmosphere and rapidly burning it in a rapid-burning device for a period of time, followed by cooling, to obtain recycled graphite. The invention also discloses the preparation and application of this recycled graphite. This invention is applicable to the field of lithium battery recycling technology. Rapid burning effectively removes impurity elements from the negative electrode graphite in waste lithium batteries, helping to reduce the negative impact of these impurities on the performance of the negative electrode graphite; subsequently, through the grinding reaction with sublimed sulfur and red phosphorus, C-S-P bonds are formed, improving the conductivity and rate performance of the graphite, thereby enhancing the capacity and cycle performance of the obtained recycled graphite.

This invention relates to the field of semiconductor technology, specifically disclosing a gallium oxide epitaxial wafer and its preparation method. The preparation method of the gallium oxide epitaxial wafer includes the following steps: S1, placing a (011)-plane gallium oxide substrate in a reaction chamber, introducing a carrier gas, and then introducing oxygen, chlorine, and hydrogen for a first growth; S2, introducing oxygen and hydrogen chloride for a second growth on the first-grown gallium oxide substrate to obtain a gallium oxide epitaxial wafer; wherein, in S1, the flow rate ratio of oxygen to chlorine is (2~3):1; in S2, the flow rate of oxygen is 200~400 sccm, and the flow rate ratio of oxygen to hydrogen chloride is (5~20):1. This invention optimizes the number of growth cycles and growth conditions during the preparation of the gallium oxide epitaxial wafer, reduces epitaxial defect density, improves epitaxial film quality, and realizes the preparation of high-thickness gallium oxide epitaxial wafers with low surface defects and nanoscale surfaces.

This product relates to the field of polymer composition technology and discloses a weather-resistant and anti-aging outdoor PVC artificial leather material. The material includes a base fabric and a PVC resin layer formed on at least one side of the base fabric. The PVC resin layer is formed by plasticizing PVC paste resin, a polymeric plasticizer, and a composite stabilizing component. The composite stabilizing component includes an organically intercalated layered double hydroxide with anions of ultraviolet-absorbing compounds containing carboxylic acid groups and aromatic conjugated structures as interlayer anions, a polymeric hindered amine light stabilizer, and an epoxy-type auxiliary stabilizer. This material can restrict the migration of ultraviolet-absorbing components, continuously achieving ultraviolet energy reduction, fixation of acidic degradation products, and free radical termination, delaying yellowing, chalking, cracking, and mechanical property degradation of the PVC resin layer, and improving weather resistance stability during outdoor use.

The present application relates to the technical field of fluorine-containing wastewater treatment, and specifically discloses a fluorine-containing wastewater coagulation-crystallization advanced treatment method and equipment, which comprises the following steps: sending fluorine-containing wastewater into a conditioning tank for water quality and quantity homogenization; sending the conditioned wastewater into a reconstruction section reaction tank, and then into a reconstruction section conditioning tank and a reconstruction section flocculation tank in sequence; introducing part of the first fluorine-containing sludge into a crystal fluorine recrystallization device, and then returning the activated sludge to the reconstruction section reaction tank; sending the supernatant into an induction section reaction tank; then into an induction section conditioning tank and an induction section flocculation tank in sequence, and finally performing solid-liquid separation in an induction section sedimentation tank; and monitoring the fluorine ion concentration of the effluent from the induction section sedimentation tank. The present application constructs a two-section gradient coupling treatment system of "reconstruction section rough fluorine removal + induction section fine fluorine removal", and innovatively integrates the "crystal fluorine recrystallization strengthening" and "exceeding standard backflow closed loop regulation and control" mechanisms.

The utility model provides a bubble eliminating device in an electrolytic copper electrolysis process, belongs to the technical field of electrolytic copper, and aims to solve the problem that in an existing electrolytic bath, although bubbles can be brought to a liquid level by mechanical stirring and electrolyte circulation, the surface quality of cathode copper is still possibly influenced due to the fact that an electrode top area is close to a bubble layer. Comprising an electrolytic bath, a front water blocking tank, a driving cylinder, a defoaming assembly and a filtering and separating assembly, the front water retaining tank is fixedly connected to the front of the electrolytic cell; the bottoms of the two driving cylinders are fixedly connected to the left side and the right side of the electrolytic cell correspondingly. The defoaming assembly is arranged inside and in front of the electrolytic bath; and the filtering and separating assembly is arranged in front of the electrolytic bath. The flow direction of the electrolyte is controlled through the water retaining block, the electrolyte containing bubbles is introduced into the water storage tank, the bubbles are broken through the defoaming pump and circularly reinjected into the electrolytic bath, meanwhile, copper slag is intercepted by the filter plate, and the quality of the electrode is guaranteed.

The invention discloses a method for optimizing a production process of a 6-series alloy frame profile, and relates to the technical field of aluminum alloy materials, the optimization method comprises the following steps: a 6-series aluminum alloy capable of improving the surface quality comprises the following components: 0.4-0.8% of silicon, less than or equal to 0.7% of iron, 0.15-0.4% of copper, less than or equal to 0.15% of manganese, 0.8-1.2% of magnesium, 0.04-0.35% of chromium, less than or equal to 0.25% of zinc, less than or equal to 0.15% of titanium, and the balance of aluminum and other inevitable impurity elements; the mechanical property of an extruded product is improved by optimizing a cast ingot homogenizing process, and the quenching sensitivity requirement is reduced, so that the qualified rate of the quenched product is improved. By optimizing the extrusion process, the deformation of the product after quenching is reduced, so that the qualified rate of the product after quenching is improved. The alloy performance can be as follows: the tensile strength is greater than or equal to 280 MPa, the yield strength is greater than or equal to 240 MPa, and the ductility is greater than or equal to 8%.

This application belongs to the field of display technology and relates to a self-crosslinking compound, a thin film, an optoelectronic device, and a display apparatus. The self-crosslinking compound can reduce surface defects and stress in inorganic perovskite materials.

This application relates to a method for preparing CsPbBr3 nanosheet materials and their applications. The method includes: mixing cesium carbonate, oleic acid, and an oil-phase solvent, and stirring and heating under an inert gas atmosphere until the solution becomes clear, obtaining a cesium precursor solution; mixing octadecene, oleic acid, oleylamine, and lead bromide, heating until the lead bromide is completely dissolved, and then cooling to 22°C to obtain a mixed clear solution; injecting the cesium precursor solution into the mixed clear solution, maintaining the temperature at 22°C for 10 seconds, adding isopropanol and acetylene dicarboxylic acid, heating to 100°C after 10 seconds and maintaining the temperature for 10 minutes, cooling the reaction temperature to room temperature, centrifuging and washing, and collecting the precipitate to obtain the CsPbBr3 nanosheet material. This application involves the use of the CsPbBr3 nanosheet material in the preparation of photodetectors. This application can improve the luminous efficiency and stability of CsPbBr3 nanosheets under blue light, and improve the performance of photodetectors based on CsPbBr3 nanosheets.

The invention belongs to the technical field of photoelectrochemistry, and particularly relates to a preparation method and application of a high-performance NiCoOOH / MoO3 / Mo: BVO photoelectrode film. Firstly, a BiOI nano array is prepared through an electro-deposition method, and then a BVO photoelectrode film is prepared through high-temperature calcination. And then dispensing the Mo source on the BVO photoanode, and carrying out secondary high-temperature calcination to prepare the MoO3 / Mo: BVO photoelectrode film. And finally, cobalt nitrate hexahydrate and nickel sulfate hexahydrate are dissolved in a sodium hydroxide solution to prepare a NiCoOOH electro-deposition solution, and a NiCoOOH / MoO3 / Mo: BVO photoelectrode film is prepared through CV electrochemical deposition. At the moment, the cocatalyst NiCoOOH improves the stability, and meanwhile, the separation and injection efficiency of photon-generated carriers of BVO is enhanced by adding the MoO3 layer and doping Mo, so that the photoelectric property of the BVO photoelectrode is remarkably improved, and the BVO photoelectrode can be applied to photoelectrochemical water decomposition.

This application relates to the field of solar cell technology, and more particularly to a solar cell, a tandem cell, and a photovoltaic module. The first textured structure of the metallized region includes a raised structure, which includes at least a platform structure. The platform structure includes a side surface and a top platform with micro-pyramids. Both the side surface and the micro-pyramids reflect incident light, which is beneficial to improving the absorption capacity of long-wavelength light. Furthermore, the combination of the side surface and the micro-pyramids helps to reduce the number of relatively large sharp peaks, reduces surface defects, and facilitates the deposition of a passivation layer, thereby reducing the recombination probability of charge carriers and improving the photoelectric conversion efficiency of the solar cell. At the same time, the top platform with micro-pyramids can also allow the electrode paste to fully fill the gaps, increasing the contact area between the electrode and the substrate, which helps to reduce the contact resistance and improve the charge carrier collection efficiency, thereby improving the photoelectric conversion efficiency.

The invention belongs to the technical field of nano material preparation, discloses a zero-dimensional perovskite nanocrystalline large-scale preparation method based on a room-temperature self-assembly strategy, and aims to solve the technical problems that in the prior art, the uniformity of a product is poor, high luminous efficiency and conductivity are difficult to achieve at the same time, and the wavelength cannot be accurately regulated and controlled. According to the method, a water-in-oil microemulsion system is adopted as a nanoreactor, and the high uniformity of nanocrystal growth is fundamentally guaranteed through a confinement reaction. The composition creatively comprises two ligands: one ligand is a pi-conjugated conductive main functional ligand with surface passivation and charge transfer functions, which solves the problem of poor conductivity caused by the traditional insulating ligand while ensuring high photoluminescence efficiency, and the other ligand is a competitive tuning ligand which forms dynamic competitive balance with the main ligand. The key problems of product uniformity, conductivity, wavelength controllability and the like are synergistically solved, and the prepared nanocrystal has high optical purity, high quantum yield and excellent conductivity.

The utility model belongs to the technical field of metal processing, and particularly relates to a high-thermal-conductivity metal processing calendering device which comprises a calendering machine, two conveying rollers are installed in the middle of the calendering machine, two calendering rollers are installed in the middle of the calendering machine, a preheating box is fixedly connected to the middle of the calendering machine, two preheating grooves are formed in the middle of the preheating box, and the two preheating grooves are communicated with the calendering machine. The two preheating grooves are oppositely arranged, two fixing boxes are fixedly connected to the middle of the preheating box, the two fixing boxes are fixedly connected to the positions corresponding to the preheating grooves, two through grooves are formed in the side walls of the fixing boxes, the two through grooves are oppositely arranged, a plurality of through holes are formed in the middles of the fixing boxes, and two fans are installed in the middles of the fixing boxes. Through the structure, the metal material can be effectively preheated before being rolled, the temperature gradient of the metal material in the rolling process is reduced, a metal product is effectively and more easily subjected to plastic deformation, and the size deviation caused by uneven local hardness is reduced.

The application provides a GaN-based light-emitting diode epitaxial structure and a preparation method thereof, wherein a Zn source is introduced as a surface activator during the growth of a P-type AlGaN electron blocking layer, a P-type AlGaN electron blocking layer structure with a gradient distribution of Zn concentration along the direction of the P-type AlGaN electron blocking layer is constructed, and specifically, through the core role of the Zn surface activator and the innovative design of the gradient distribution of the Zn concentration, the valence band Ev is smoothly and non-peaked along the whole process, and the hole injection is smooth along the whole process under the premise of ensuring that the conduction band Ec is smoothly and non-peaked and the strong electron blocking capability is not lost.

The invention discloses a high-reliability liquid capacitor and a preparation method thereof, and relates to the technical field of electrolytic capacitors. The high-reliability liquid capacitor comprises a core package and an aluminum shell, the core package comprises an anode foil, a cathode foil, an electrolyte solution and electrolytic paper, the preparation method comprises the steps of formation, winding compounding, liquid immersion, vacuum heat sealing and cooling solidification, and the prepared liquid capacitor is high in sparking voltage, low in generated leakage current and long in service life.

The invention provides a stable-ligand CdSe / ZnS quantum dot based on multiple binding sites, a preparation method of the stable-ligand CdSe / ZnS quantum dot and a carrier-injection-free LED device. According to the scheme, the alanine modified long-chain alkylamine ligand is used, alanine endows the ligand with more sites which are mutually combined with the surfaces of the quantum dots, on one hand, more binding sites can passivate surface defects of the CdSe / ZnS quantum dots and improve the luminous efficiency, and on the other hand, the stability of the quantum dots can be improved; the prepared modified quantum dots can be applied to injection-free electroluminescent devices driven by a high-frequency alternating-current electric field.

The invention discloses a pure highland barley powder extrusion puffing process optimization method, and belongs to the technical field of food extrusion processing. According to the method, the technical problems that the high-fiber highland barley powder is easily subjected to insufficient puffing and too hard texture in the extrusion process, and the retention rate of heat-sensitive functional components such as beta-glucan is low are solved. The method comprises the following steps: optimizing process parameters based on a multi-target response surface method, and determining the water content of materials, the temperatures of a first region, a second region, a third region and a fourth region of a machine barrel and the rotating speed of a screw; carrying out low-temperature superfine grinding on the highland barley powder; a compound emulsifier and edible sodium bicarbonate are added during hardening and tempering; during extrusion, the temperature gradient between the third area and the fourth area is controlled to be smaller than or equal to 20 DEG C; the method is mainly used for producing the high-quality pure highland barley puffed food, the puffing rate and the beta-glucan retention rate of the product can be synergistically improved, the hardness of the product is effectively controlled, and the eating quality and the nutritional value are improved.

The invention provides a perovskite absorption layer and a preparation method and application thereof, and the preparation method comprises the steps: coating a perovskite wet film with an ionic liquid solution, and carrying out the annealing treatment, thereby obtaining a uniform, flat and smooth perovskite absorption layer. Compared with a common method of passivating the perovskite thin film after annealing, the method has the advantages that the wet film passivation distribution depth can be increased by selecting the appropriate passivation layer, so that the surface defects of the perovskite thin film are repaired more efficiently, and perovskite crystal lattices are stabilized. According to the preparation method, the one-time annealing process can be reduced, and the production line preparation time is shortened; and the upper interface of the perovskite thin film can be effectively modified, good ohmic contact with an electron transport layer is formed, and the photoelectric property of the perovskite solar cell is improved. In addition, a green and environment-friendly solvent with low toxicity and high volatility is selected, so that the method is suitable for large-size industrial assembly line preparation scenes.

Provided is a polishing composition that can achieve wettability enhancement and haze reduction of a polished surface of a silicon wafer. The polishing composition for a silicon wafer contains an abrasive, a cellulose derivative, a surfactant, a basic compound, and water. Here, the cellulose derivative has a weight average molecular weight of more than 120 × 104, and the surfactant has a molecular weight of less than 4000.

The present application belongs to the technical field of electric arc additive manufacturing, and discloses an online self-adaptive regulation method for the appearance of electric arc additive manufacturing. According to the deviation between the actual formed part appearance and the theoretical appearance of the part, the forming trajectory and forming parameters of the unformed part are dynamically adjusted. In this way, a layer closed-loop control mechanism is formed, which can reduce the forming deviation and improve the flatness of the deposited layer surface. The method can be widely applied in the field of electric arc additive manufacturing, effectively solving the problem of poor cumulative forming precision of electric arc additive manufacturing, improving the forming quality and surface flatness during additive manufacturing, ensuring the stability of the process, and realizing a more accurate and reliable manufacturing process.

The application provides a preparation method of high-end electronic-grade polyimide film, and the film is prepared from diamine monomers, dianhydride monomers and cross-linking fluorine-containing reaction monomers through polymerization, doping, casting, two-way stretching and gradient imidization. The application effectively solves the problems of high thermal expansion coefficient, large high-frequency dielectric loss and poor size stability of the existing polyimide film by introducing rigid cross-linking units containing fluorine into the molecular chain, and combining multi-batch low-temperature polymerization, multi-layer gradient filtration, simultaneous two-way stretching and segmented gradient imidization process. The method is stable in process, the product has excellent comprehensive performance, and is suitable for fields of 5G high-frequency communication flexible copper-clad plate and chip packaging substrate.

A method for in-situ synthesis of PbCl2-coated PbSe quantum dots. The synthesis steps are as follows: mixing lead oxide (PbO), 1-octadecene (ODE), oleic acid (OA) and lead chloride (PbCl2), removing water oxygen in the reaction system under vacuum conditions, slowly heating to completely dissolve yellow PbO, then passing nitrogen and continuing to heat to temperature stability; injecting diphenylphosphine selenium (DPPSe) solution into Pb precursor solution, then slowly pushing into the mixed solution of diphenylphosphine (DPP) and tri-n-octylphosphine selenium (TOPSe) with a stepper motor to obtain PbCl2-coated PbSe quantum dots. By changing the amount of PbCl2, the particle size distribution of the synthesized PbSe quantum dots is controlled, and the finally prepared quantum dots have uniform particle size distribution and high air stability.

The application belongs to the technical field of perovskite material preparation, and particularly discloses a mixed halogen perovskite single crystal material and a preparation method thereof. 2.8 I 0.2 The obtained single crystal is treated at 20 DEG C and 90% RH for 3-6 h, surface defects are systematically repaired by using the moisture-induced lattice expansion and surface hydroxyl passivation mechanism, ion migration is inhibited, and the phase separation phenomenon is slowed down. The process is simple, controllable, and reproducible, and is suitable for laboratory-scale preparation and industrialization promotion.

This invention relates to the field of optoelectronic device technology, and in particular to a perovskite heterojunction and its preparation method. The perovskite heterojunction comprises a narrow-bandgap perovskite single crystal and a wide-bandgap perovskite single crystal, with the wide-bandgap perovskite single crystal loaded on the surface of the narrow-bandgap perovskite single crystal. The bandgap of the narrow-bandgap perovskite single crystal is 2.21 eV–2.34 eV, and the bandgap of the wide-bandgap perovskite single crystal is 2.91 eV–3.29 eV. The perovskite heterojunction structure of this invention consists of a wide-bandgap perovskite single crystal encapsulating a narrow-bandgap perovskite single crystal. Because the outer perovskite layer has a wider bandgap, its absorption wavelength range is narrower than that of the inner narrow-bandgap perovskite layer. Therefore, by selecting a suitable laser excitation band, interference from the outer perovskite layer can be avoided, and the information from the inner perovskite layer can be directly obtained. Simultaneously, because the outer perovskite layer can protect the inner perovskite layer, it can passivate surface defects of the inner perovskite to a certain extent and isolate the influence of water vapor and oxygen in the working environment.

This invention relates to the field of harmless treatment technology for oily sludge, specifically to a method for preparing carbon quantum dots from oily sludge. Conventional methods for preparing carbon quantum dots from oily sludge have limitations in yield and fluorescence intensity. To address these issues, this invention provides a method for preparing carbon quantum dots from oily sludge. Considering the complex composition of oily sludge, this invention designs a multi-stage purification process chain of "ultrasonic extraction—water washing—Soxhlet extraction—acidification treatment." Each step works synergistically, purifying the sludge step by step to ultimately obtain a high-purity refined organic carbon source. The refined organic carbon source removes impurities through gentle solvent extraction and acid washing, maximizing the preservation of the organic carbon source's chemical activity and structural integrity. In the hydrothermal reaction, it can be effectively converted into carbon quantum dots, avoiding carbon source loss or activity reduction due to over-processing, thus further improving the yield and fluorescence intensity of carbon quantum dots.

The application discloses a resin acid interface modified perovskite solar cell, which comprises a transparent conductive electrode, an electron transport layer, a perovskite active layer, an interface modification layer, a hole transport layer and a metal electrode layer which are stacked in sequence; wherein the electron transport layer is a SnO2 film, the interface modification layer is a resin acid (C 19 H 29 COOH), and the perovskite active layer is MAPbI3 (CH3NH3PbI3); the perovskite cell has lower interface defects, can maintain higher photoelectric conversion efficiency under high humidity conditions, and has higher environmental stability. The application further provides a preparation method of the resin acid interface modified perovskite solar cell.

Provided is a method for producing a polishing composition of which filterability is good and which can reduce surface defects of an object to be polished. A method for producing a polishing composition containing a modified polyvinyl alcohol composition containing a modified polyvinyl alcohol or a derivative thereof and water includes a heat retention step of retaining the modified polyvinyl alcohol composition at a solution temperature of 30°C or higher and lower than 60°C, in which the heat retention step is performed such that a parameter A is 2.0 or more.

The invention provides a manufacturing method of a gate oxide layer, which comprises the following steps of: firstly, providing a silicon-containing substrate; next, a first oxygen plasma deposition is provided to form a first silicon dioxide layer covering the silicon-containing substrate. Second, a second oxygen plasma deposition is provided to form a second silicon dioxide layer covering the first silicon dioxide layer. And finally, providing third oxygen plasma to bombard the second silicon dioxide layer.