27 results about "Vacuum annealing" patented technology

This invention discloses a heat treatment process for reducing the fracture sensitivity of 20Mn2A circular link chains, comprising the following steps: (1) Pretreatment: heating to 650±10℃ at a rate of 4.8-5.2℃ / min in a vacuum annealing furnace, holding for 1-3 hours, and then cooling to room temperature in the furnace; (2) Graded quenching; (3) Two-stage tempering: the first stage is low-temperature tempering: holding at 200-210℃ for 2-3 hours, followed by oil cooling; the second stage is medium-temperature tempering: holding at 380-400℃ for 1-2 hours, followed by oil cooling. This invention, through a scientific three-stage treatment, achieves an optimized match between the strength and toughness of 20Mn2A circular link chains, with the specific objectives being: tensile strength ≥1050N / mm², low-temperature impact energy at -40℃ ≥48J, and internal residual stress ≤85MPa, significantly reducing fracture sensitivity and extending service life.

The present application belongs to the technical field of electrolytic copper foil manufacturing, and particularly relates to a HVLP copper foil with low surface roughness and a preparation method thereof. The preparation method comprises the following steps: electrolytic foil growth, vacuum annealing treatment, electrochemical grain boundary pinning treatment, surface treatment and drying and slitting. The vacuum annealing treatment is performed after the electrolytic foil growth and before the surface treatment, so as to eliminate the residual stress in the copper foil; the electrochemical grain boundary pinning treatment adopts a silicon tungstate or phosphomolybdate electrolyte, and introduces tungsten or molybdenum elements at the grain boundary of the copper foil to form a pinning layer; in the surface treatment, the roughening treatment adopts pulse current and adds grain nano-refining additives, the solidification treatment is performed in a solidification liquid containing a rare earth salt, and the silane coupling agent treatment adopts a complex treatment liquid of KH-560 and a long-chain alkyl silane coupling agent. The obtained HVLP copper foil has a roughness Rz of the rough surface of less than or equal to 0.8 microns, high initial peel strength, a peel strength retention rate of more than 80% after hygrothermal aging, and good long-term service stability.

This invention discloses a method for preparing permanent magnets by low-temperature orientation molding and hot-pressing densification of omnidirectional NdFeB magnetic powder, relating to the field of permanent magnet materials technology. The invention includes the following steps: Fe, B-Fe alloy, and Co are melted, and Nd, Ga, Al, and Cu are added and melted. After casting, the mixture is vacuum annealed, crushed, and treated in a hydrogen atmosphere at 300-350℃, followed by vacuum treatment at 350℃, then treatment in a hydrogen atmosphere at 800-820℃ and 80kPa, and then vacuum treatment in a constant axial static magnetic field at 800℃, 0.08-0.1Pa, and 2.2-2.5T. After discharge, the material is pretreated with a dilute nitric acid aqueous solution, then modified with a modified suspension and modified nanosheet dispersion, and finally subjected to warm pressing, vacuum degreasing, and hot pressing to obtain an omnidirectional NdFeB permanent magnet with excellent remanence, intrinsic coercivity, maximum energy product, and squareness.

The present application relates to a kind of shallow diamond NV color center preparation method, shallow diamond NV color center, specifically relates to quantum material technical field, the preparation method includes: diamond is sequentially ion implanted, vacuum annealing, ladder vacuum annealing, and oxygen annealing;The angle of the ion implantation is 7-10 °;The energy of the ion implantation is 2-30 keV.The shallow diamond NV color center provided in the present application, by optimizing the parameter of ion implantation, so that the distribution interval of diamond NV color center in shallow along depth direction is narrow, to ensure that it has good use performance when being used as quantum material.

The present application relates to the technical field of vacuum equipment, and proposes a vacuum temperature rising annealing mechanism with a liftable heating cover, which comprises a vacuum equipment and a vacuum annealing furnace, the vacuum equipment and the vacuum annealing furnace are connected through a plug valve, a bearing plate is detachably connected inside the vacuum annealing furnace, a partition plate is fixedly connected to the inner wall of the upper end of the vacuum annealing furnace, the vacuum annealing furnace is divided into an installation cavity and an annealing cavity through the partition plate, the installation cavity and the annealing cavity are in communication, a driving part is fixedly installed on the vacuum annealing furnace, a heating cover driven to lift by the driving part is arranged in the vacuum annealing furnace, and a collection box is detachably installed at the bottom end of the vacuum annealing furnace. When the temperature rising annealing process is performed on the workpiece, the heating cover is first covered on the periphery of the workpiece to form a relatively closed heating space, the workpiece is radiantly heated by means of the molybdenum sheet heater arranged in the heating cover, which helps to establish a uniform and stable thermal field environment around the workpiece, thereby effectively improving the overall effect of the annealing process.

The application discloses wafer-level two-dimensional graphite-phase carbon nitride and a preparation method thereof. The preparation method comprises the following steps: placing a substrate in a pretreatment cavity after cleaning and drying; performing degassing and vacuum annealing on the substrate until an atomic level step appears on the surface of the substrate, and then cooling to a first temperature; controlling a growth table to be heated to the first temperature, transferring the substrate to the growth table, and heating to a second temperature; controlling the growth table to rotate, introducing nitrogen into the growth cavity, and controlling a nitrogen plasma generating device and an electron beam device to start working; synchronously opening a nitrogen plasma generating device shutter and an electron beam device shutter; and cooling to room temperature after growth is completed. The wafer-level two-dimensional graphite-phase carbon nitride film is directly prepared based on a method of plasma-assisted molecular beam epitaxy, the prepared two-dimensional graphite-phase carbon nitride has good uniformity and high crystallization quality, the size and thickness of the prepared graphite-phase carbon nitride film can be adjusted based on actual requirements, and different research or working condition requirements can be met.

The application relates to the technical field of chemical materials, and particularly discloses a preparation method of solid catalytic material with a surface rich in hydrogen bond microenvironment and application of the solid catalytic material in uranium separation, and the preparation method comprises the following steps: after washing and drying a metal material, the metal material is placed in a plasma reactor, then gas is introduced, plasma treatment is carried out, vacuum annealing is carried out after the treatment is completed, and the solid catalytic material is obtained. The application introduces a hydrogen bond special microenvironment on the surface of the metal material, has good photocatalytic uranium separation performance, realizes uranium separation in radioactive wastewater, and solves the problem that powder state photocatalytic materials are not applicable in actual popularization and application.

This invention discloses a method and corresponding system for purifying high-purity copper using an electronic-grade tri-acid cycle, relating to the field of purification technology. The steps are as follows: crude copper or waste copper is oxidized and dissolved using a specific ratio of electronic-grade nitric acid-sulfuric acid-hydrochloric acid mixture to obtain a leachate; a customized complexing agent is added to selectively remove precious and heavy metal impurities; high-purity copper is prepared through copper displacement and electrolytic reduction; the acid waste liquid is regenerated through three-stage fractional distillation and then recycled to achieve a closed-loop tri-acid cycle; finally, electronic-grade high-purity copper is obtained through vacuum annealing and densification. The system includes closed-loop connected units for oxidation dissolution and complexation impurity removal, and is equipped with tail gas treatment and intermediate detection modules. This method achieves a copper recovery rate ≥99%, an acid recovery rate ≥95%, no waste acid discharge, and a final product purity ≥99.9999%, meeting the needs of high-end electronics fields while being both environmentally friendly and economical.

The present application relates to the technical field of pipe annealing, and discloses a method for improving straightness and outer diameter of nuclear zirconium alloy cladding pipe after annealing, which comprises the following steps: step one, installing an elastic constraint structure on the inner wall of an annealing tool; step two, arranging the pipe to be annealed into the annealing tool with the elastic constraint structure through a specific arrangement method; step three, annealing the arranged annealing tool in a vacuum annealing furnace; and step four, removing the pipe to be annealed from the annealing tool after annealing. The elastic constraint structure in the present application overcomes the shortcomings of rigid constraint between the pipes and between the pipes and the tool in the existing annealing tool. The thermal expansion between the pipes is absorbed by the elastic constraint structure during the annealing process, and the local outer diameter size change caused by the rigid contact between the pipes and the tool is reduced. The straightness and outer diameter size change after annealing in the present application are obviously improved compared with the existing annealing method.

The application discloses a production method for improving the yield of titanium alloy seamless pipes, and comprises the following steps: mixing raw materials to press into multiple electrode blocks, welding to obtain consumable electrodes; adding alloy element tantalum into the consumable electrodes, melting by using a vacuum consumable arc furnace to obtain titanium alloy ingots; after heat preservation, carrying out multi-pass hot continuous rolling to obtain titanium alloy bars; polishing the surface of the titanium alloy bars, carrying out inclined piercing to form a pipe blank after heat preservation; after pickling, carrying out one-pass cold rolling to obtain a pipe blank; boring the pipe blank from the inside to the outside, then carrying out multi-pass cold rolling to obtain a titanium alloy seamless pipe semi-product; sequentially carrying out vacuum annealing, pickling and polishing on the titanium alloy seamless pipe semi-product to obtain a titanium alloy seamless pipe. The application can improve the yield of pipe materials, is especially suitable for titanium alloy seamless pipes with a pipe diameter less than 20 mm, has a wide application prospect, and can be applied to important or key components such as hydraulic pipelines and fuel pipelines of an airplane.

The application discloses a kind of iron wire coil vacuum annealing furnace subsection temperature self-adapting control method, specifically relates to steel wire coil vacuum annealing control technical field, for solving existing iron wire coil vacuum annealing process when furnace charging weight and stacking mode change still rely on artificial experience setting curve, temperature field in furnace is not uniform, resulting in organization and hardness batch fluctuation, energy consumption is difficult to fine control problem.Through in furnace charging after steel grade, furnace charging weight and stacking mode match annealing subsection control template, identify heat load index in vacuum extraction stage, and in the whole process of annealing based on temperature field uniformity index and thermal history index self-adapting adjustment three-temperature zone target temperature bias and cycle, strong cold fan working condition, to thereby in furnace charging condition fluctuation and stacking mode change automatically match the heat load of this furnace, keep hearth temperature field uniform, stabilize iron wire coil organization and hardness and reduce the technical effect of dependence on artificial experience test firing.

The utility model discloses a series connection type vacuum drying annealing equipment, including first vacuum cavity, second vacuum cavity, vacuum drying cavity and vacuum annealing cavity in series connection, first vacuum cavity and second vacuum cavity are communicated through first valve, second vacuum cavity and vacuum drying cavity are communicated through second valve, vacuum drying cavity and vacuum annealing cavity are communicated through third valve, the substrate that has been coated vacuum drying annealing film layer passes first vacuum cavity, second vacuum cavity, vacuum drying cavity and vacuum annealing cavity in proper order, first vacuum cavity and second vacuum cavity are independently connected vacuum source respectively, and first vacuum cavity is low vacuum cavity, and second vacuum cavity is high vacuum cavity, the utility model discloses can improve process beat significantly, improve production line capacity, and the cavity of different vacuum degree facilitates buffer -type feeding, thereby reducing the mura phenomenon of film layer.

The application discloses a preparation method of large-size molybdenum rod based on low magnetic susceptibility molybdenum powder, which comprises the following steps: preparing low magnetic susceptibility molybdenum powder through vacuum purification; obtaining a molybdenum powder green body through static pressure forming; preparing a high-density molybdenum blank through vacuum segmented sintering; obtaining a heat-treated molybdenum blank through segmented heat treatment; obtaining a molybdenum rod rough blank through multi-pass temperature control forging; and obtaining a large-size low magnetic susceptibility molybdenum rod after vacuum annealing. The preparation method of the large-size molybdenum rod based on the low magnetic susceptibility molybdenum powder removes ferromagnetic impurities such as Fe, Ni and Co in the molybdenum powder from the source through vacuum purification, so that the total content of the impurities is less than or equal to 5 ppm, the oxygen content is less than or equal to 20 ppm, the magnetic susceptibility of the molybdenum rod is fundamentally reduced, and the magnetic susceptibility of the finished product is less than or equal to 1.0*10 ‑6 emu / g; the cold isostatic pressing and the vacuum segmented sintering process improve the density of the large-size molybdenum blank, the relative density is greater than or equal to 99.5%, and there are no defects such as pores and internal cracks.

This invention discloses a novel composite vacuum annealing device. The device comprises x annealing modules, each including a vacuum chamber and a heat source. The heat source is disposed within the vacuum chamber, and the x vacuum chambers are controllably connected. The sample to be annealed can be transferred between the x vacuum chambers. Specifically, m of the annealing modules use infrared heat sources, and n use resistance heat sources, where x ≥ 2, m ≥ 1, and n ≥ 1. This invention combines the advantages of rapid heating with the good heat retention of resistance heating, and is further enhanced by the periodic reciprocating motion of a vacuum-assisted external loading plate. This effectively improves the temperature uniformity during long-term annealing and also allows for the long-term annealing of large-sized samples.

This invention relates to a process for preparing lithium metal surface coating modification for sulfide solid electrolytes, belonging to the field of solid-state lithium battery material preparation technology. Lithium metal foil is ultrasonically cleaned with anhydrous ethanol and dried. The dried lithium metal foil is placed on the sample stage of a magnetron sputtering device, using an Al target as the sputtering source, and a mixed gas is introduced for magnetron sputtering to form an Al2O3 underlayer. Lithium ethanol and phosphoric acid are used as lithium and phosphorus sources respectively, and argon gas is introduced as the carrier gas. A composite coating of Li3PO4-Al2O3 is obtained through plasma-assisted atomic layer deposition. The composite-coated lithium metal foil is transferred to a vacuum annealing furnace for vacuum annealing, cooled, and then transferred to a plasma device, where a mixed gas is introduced for plasma treatment. After argon purging, the foil is removed, sealed, and stored in a glove box. The coated modified lithium metal prepared by this invention can effectively reduce interfacial impedance and significantly improve battery cycle stability.

The utility model provides a kind of laser vacuum annealing device, including first vacuum cavity, the bearing table of being housed in the first vacuum cavity;The first vacuum cavity is provided with the window that laser beam can pass through;The first vacuum cavity is communicated with the second vacuum cavity of housing mechanical arm, and mechanical arm is configured to carry the wafer of at least one wafer elevator to the bearing table.The laser vacuum annealing device of the utility model increases vacuum cavity, eliminates oxygen element in annealing process process, realizes complete oxygen-free in silicide formation process;Meanwhile, the wafer warping information before annealing is obtained by automatic focusing assembly and the focusing depth of laser annealing is accurately adjusted according to the above information of wafer, reduces the peeling of annealing layer caused by annealing, reduces the risk of semiconductor device performance decline caused thereby.

The application provides a preparation method of a hole transport layer, a perovskite solar cell and a preparation method thereof. The preparation method of the hole transport layer comprises the following steps: providing an electrically conductive substrate; conveying the electrically conductive substrate to a first chamber to form a first initial hole transport layer on one side surface of the electrically conductive substrate; conveying the electrically conductive substrate to a second chamber to form a second initial hole transport layer on the side surface of the first initial hole transport layer away from the electrically conductive substrate; conveying the electrically conductive substrate to a vacuum annealing chamber and / or a nitrogen annealing chamber to perform vacuum annealing treatment and / or nitrogen annealing treatment on the first and second initial hole transport layers; and placing the electrically conductive substrate in a vacuum environment during the conveying process. The obtained hole transport layer has high compactness, which is beneficial to improving the electrical performance of the perovskite solar cell.

The application relates to a lithium metal surface coating modification preparation process for a sulfide solid-state electrolyte, and belongs to the technical field of solid-state lithium battery material preparation. Lithium metal foil is ultrasonically cleaned with anhydrous ethanol and dried; the dried lithium metal foil is placed on a sample table of a magnetron sputtering device, an Al target is used as a sputtering source, mixed gas is introduced, magnetron sputtering is carried out, and an Al2O3 base layer is formed; ethanol lithium and phosphoric acid are used as a lithium source and a phosphorus source respectively, argon is introduced as a carrier gas, plasma-assisted atomic layer deposition composite coating is carried out, and a Li3PO4-Al2O3 composite coating layer is obtained; the lithium metal foil after composite coating is transferred to a vacuum annealing furnace, vacuum annealing is carried out, and the lithium metal foil is transferred to a plasma device after cooling; mixed gas is introduced, plasma treatment is carried out; after argon blowing, the lithium metal foil is taken out and sealed and stored in a glove box. The coated modified lithium metal prepared by the application can effectively reduce the interface impedance and significantly improve the cycle stability of the battery.

The application discloses a preparation process of an elliptical ring-shaped nanocrystalline alloy iron core with high initial permeability, and comprises the following specific steps: S1, designing the iron core and a mold thereof; S2, winding amorphous alloy ribbons into a circular ring-shaped iron core according to the size and volume of the iron core; S3, placing the circular ring-shaped iron core into the mold; S4, placing the mold with the circular ring-shaped iron core into a vacuum annealing furnace to perform vacuum crystallization annealing; S5, after the annealing is completed, taking out the annealed circular ring-shaped iron core from the mold, placing the annealed circular ring-shaped iron core into an elliptical ring-shaped stainless steel protective box, and pouring silicon rubber to package the elliptical ring-shaped stainless steel protective box; and S6, measuring V-A characteristics by using an iron core performance measuring instrument, and calculating the initial permeability from the V-A data, compared with the prior art, the application offsets the deformation in the crystallization process by pre-deformation before annealing and mold shrinkage during the annealing process, greatly reduces internal stress, and obtains high initial permeability; uniform deformation of the elliptical ring-shaped iron core can be realized, and the elliptical ring shape is maintained after the annealing.

The present application relates to the technical field of surface engineering, and particularly relates to a PVD multi-arc coating process for solving the difficult demolding of carbon fiber hot press forming. 3×10‑3Pa Under the conditions of workpiece revolution and rotation, a Cr transition layer, a CrN buffer layer and a CrAlN support layer are sequentially deposited, and TiAlN and CrAlN nano-multilayer modulation structures with a period ratio of 1:5 are alternately deposited; after coating, vacuum annealing at 350 DEG C is carried out, and then PFPE gas phase deposition passivation is implemented to reduce surface energy. The present application has the advantages of low friction, low surface energy, high temperature resistance, wear resistance and corrosion resistance, can significantly reduce the demolding force and improve the service life of the mold.

This invention relates to a multi-element high-abundance rare-earth permanent magnet material, its preparation method, and its application. The permanent magnet material is composed of the following atomic percentages: (Ce+La+Y) 15%-20%, Fe 70-80%, B 5-8%, Co 0.5-3%, Zr 0.1-2%; wherein the rare earth components are Ce 10-13.5%, La 1-4%, and Y 1-5%. The preparation method includes the following steps: preparing an alloy ingot of CeLaYFeCoZrB atomic percentage by arc melting of the alloy raw materials; crushing the alloy ingot and preparing alloy strips using a melt rapid quenching method; and vacuum annealing the quenched alloy strips in a magnetic field environment. Compared with the prior art, this invention uses only the high-abundance rare earth elements cerium, lanthanum, and yttrium as rare earth components, significantly improving the comprehensive magnetic properties of the high-abundance rare-earth permanent magnet material.

This invention relates to an interface engineering method and structure for high-stability graphene transistors, belonging to the field of two-dimensional material optoelectronic device manufacturing. The method first involves transferring graphene prepared by chemical vapor deposition to an insulating substrate with pre-defined electrodes and etching the channel. Subsequently, vacuum low-temperature annealing is performed in the chamber of a thin-film deposition system to remove impurity molecules adsorbed on the graphene surface. Then, without disrupting the vacuum, metal oxide nanolayers of varying thicknesses are deposited in situ for encapsulation. Through the synergistic effect of "vacuum annealing-encapsulation," the Dirac point of the graphene transistor can be brought back from heavily p-type doped to near zero, achieving its intrinsic characteristic of high carrier mobility at room temperature and pressure. Furthermore, after 60 days of storage in an atmospheric environment, the carrier mobility of graphene treated with "vacuum annealing-in-situ encapsulation" interface engineering decreases by less than 4%. This invention provides effective process guidance for the large-scale fabrication of high-performance, high-stability graphene-based optoelectronic devices.

The utility model relates to a kind of armored heating wire sealing sleeve for vacuum annealing furnace, including, vacuum pipe cover, sealing ring, sealing compression ring and sealing nut, the vacuum pipe cover end is provided with outer expansion pipe, inner groove is provided in the outer expansion pipe, sealing ring one end is embedded in inner groove, sealing compression ring is also provided in the inner groove, the sealing nut is connected vacuum pipe cover and sealing compression ring;The utility model is excellent and durable in sealing effect: the structure is sealed by the radial compression of sealing ring, under the synergistic effect of sealing nut and sealing compression ring, sealing ring can be tightly attached to the inner wall of welded pipe cover and the surface of armored heating wire, effectively prevent gas leakage, can long time maintain the low air pressure or inert atmosphere environment in vacuum furnace, meet the strict requirement of vacuum degree for high purity, high-precision heat treatment.

The application discloses a vanadium target grain refining method and belongs to the metal target material metallographic technical field, and comprises the following steps: target blank plastic deformation, plastic deformation comprises forging and rolling, and vacuum annealing treatment is carried out after each time of forging and rolling; target blank heat treatment, and the target blank heat treatment condition is under the protection of a protective gas, the temperature is 550-600 DEG C, and the heat preservation time is 20 min. In order to reduce the harm caused by work hardening in the plastic deformation process of the vanadium target, the selected intermediate heat treatment scheme is not easy to be oxidized, and can meet the temperature requirement in the plastic deformation process of the vanadium target. When the target material is heat treated, vacuum heat treatment is needed, so as to avoid that the target material is oxidized, and argon is filled as the protective gas to 10 ‑2 MPa; then the temperature is increased to 1000 DEG C and heat preservation is carried out, then power is cut off after heat preservation and the target material is cooled in the furnace, the target material is heated more uniformly; the target material is heated uniformly during heat treatment and vacuum annealing process, and the target material obtained finally does not have serious color difference on the surface.

The application provides a high-permeability low-loss iron-based nanocrystalline magnetic powder core and a preparation method thereof. The preparation method of the nanocrystalline magnetic powder core comprises the following steps: dispersing a resin bonding agent in acetone, adding an iron-based amorphous powder, and stirring until the acetone is completely volatilized; adding a release agent after granulation and drying, and obtaining an amorphous magnetic powder core after pressing and curing; the molecular formula of the iron-based amorphous powder is Fe a Si b B c Cu d Nb e M f M is a combination of two or three of metal elements Mn, V and C; and the obtained amorphous magnetic powder core is subjected to vacuum annealing treatment to obtain a nanocrystalline magnetic powder core. The obtained iron-based nanocrystalline magnetic powder core can simultaneously improve the permeability and reduce the loss by optimizing the components, and the comprehensive performance is improved; the optimized components can improve the stability and reliability of the magnetic powder core, so that the magnetic performance of the magnetic powder core can be maintained stable in a long-term use process.

The application provides a welding method of an aluminum oxide target material, which comprises the following steps: cleaning, sand blasting, PVD titanium plating and vacuum annealing treatment of an aluminum oxide target blank, then lapping the preprocessed oxygen-free copper back plate together to obtain a target material to be welded; placing the target material to be welded into a closed sleeve, performing hot isostatic pressing treatment on the closed sleeve after vacuumizing the closed sleeve to obtain the aluminum oxide target material; the raw material for sand blasting is white corundum powder, and the air pressure for sand blasting is 0.8-1.5 MPa. The aluminum oxide ceramic target blank is metallized on the welding surface, then the oxygen-free copper back plate is HIP diffusion welded, the aluminum oxide target material with a welding strength greater than or equal to 60 MPa and a well-reacted welding seam interface is obtained, and the aluminum oxide target material meets the use requirements of the semiconductor industry for such products.

This invention belongs to the field of powder processing technology and discloses a method for preparing aluminum nitride with graphene based on interfacial whisker growth. The method involves pre-treating aluminum nitride powder in a chemical vapor deposition process to introduce an Fe source. The Fe source acts as a catalytic active site, catalyzing the formation of nanoparticles on the aluminum nitride surface. This induces the Al and N atoms on the aluminum nitride surface to combine with oxygen from the iron source, catalyzing the directional growth of high aspect ratio Al-Fe-O or AlN nanofibers on the aluminum nitride surface. Graphene coating is then applied, simultaneously completing the interweaving and entanglement with the whiskers to form a three-dimensional interlocked stable structure. Defects are eliminated through low-temperature vacuum annealing, further strengthening the interfacial bonding. This method is highly operable, better suited for downstream product processes, fully utilizing the structural combination function, and improving the strength and impact resistance of downstream composite materials.