311 results about "Bimetal" patented technology

The invention discloses an inorganic normal-temperature rapid-hardening coal-rock mass reinforcing and filling material, and relates to the technical field of mine reinforcement. The material comprises a liquid A and a liquid B, the liquid A is prepared from cement, fly ash, magnetic nano silicon dioxide, citric acid and a layered bimetal oxide-sodium hexametaphosphate compound; and the liquid B comprises water glass, superfine limestone and water. During use, the liquid A and the liquid B are mixed according to the volume ratio of 1: 1 and injected into a target area, and a 1.5 Tesla magnetic field is applied at the initial stage of grouting until the grout is initially set. Through the synergistic effect of the compound protection dispersing agent, the magnetic particles and an external magnetic field, the technical problems that an existing material is unstable in performance due to temperature change, nanoparticles are prone to agglomeration, and magnetic response is attenuated in an alkaline environment are effectively solved; the technical effects of rapid solidification, high strength and excellent durability in high-temperature, low-temperature and complex mine environments are achieved.

The application discloses an automatic girth welding process for a bimetal metallurgical composite pipe, which comprises the following steps: S1, bimetal metallurgical composite pipe selection, wherein a base pipe of the bimetal metallurgical composite pipe is an X60 steel pipe, and chemical components of the X60 steel pipe are as follows: C is 0.03-0.05, Si is 0.25-0.35, Mn is 1.40-1.60, P is less than or equal to 0.008, S is less than or equal to 0.005, Cr is less than or equal to 0.30, and the balance is Fe; and a cladding layer is an Incoloy 825 corrosion-resistant alloy, and chemical components of the Incoloy 825 corrosion-resistant alloy are as follows: C is less than or equal to 0.05, Si is less than or equal to 0.50, Mn is less than or equal to 1.0, P is less than or equal to 0.005, S is less than or equal to 0.003, Ni is 38.0-45.0, Cr is 20.0-23.0, Mo is 2.5-3.5, Cu is 1.8-3.0, Ti is 0.6-1.2, Al is less than or equal to 0.15, and the balance is Fe. The application solves the problem of automatic girth welding of the bimetal metallurgical composite pipe. Not only the production cost and the labor intensity of workers are greatly reduced, but also the welding efficiency and the welding quality of the bimetal metallurgical composite pipe are effectively improved. The welded joint has excellent comprehensive mechanical properties and corrosion resistance.

The invention relates to the technical field of plasma welding, in particular to plasma welding equipment for bimetal composite pipe machining, which comprises a horizontally arranged support mounting plate, two groups of displacement support material guide modules, two groups of displacement clamping and fixing modules and a rotary welding mechanism, and the rotary welding mechanism comprises a supporting mounting ring and an adjusting welding module. The plasma welding equipment is highly integrated and automatic, the whole-process integrated operation of pipe feeding, aligning, clamping and welding is achieved, the efficiency and quality are remarkably improved, the equipment has good adaptability, pipes of different lengths and diameters are stably treated through adjustable supporting and a quick-changing clamping module, and the production efficiency is improved. The multi-degree-of-freedom welding mechanism can accurately adjust the position and the angle, it is guaranteed that girth welding is accurate and uniform, the overall structure is stable, operation is convenient and fast, and high-quality welding of the bimetal composite pipe is effectively guaranteed.

The invention discloses a rolling and expanding bidirectional laminating method for a layered bimetal composite hollow shaft, which is characterized in that an outer shaft and an inner shaft which are made of metal materials are in interference fit to obtain an initial composite hollow shaft; then the initial composite hollow shaft is fed into a three-roller skew rolling mill, when a roller performs skew rolling on the initial composite hollow shaft, the reaming rod extends into an inner hole of the initial composite hollow shaft at the same time, and the outer diameter of the reaming rod is larger than the diameter of the inner hole of the initial composite hollow shaft; the initial composite hollow shaft is subjected to bidirectional compression in the radial direction by the roller and the reaming rod during rolling; the initial composite hollow shaft is pushed forwards in the axial direction, meanwhile, the axial relative position of the roller and the reaming rod is kept unchanged till lamination rolling of the whole composite hollow shaft is completed, and the layered bimetal composite hollow shaft is obtained; the device has the advantages that during rolling, the roller and the reaming rod simultaneously compress the composite hollow shaft inside and outside in the radial direction, and the bonding strength of the composite hollow shaft is remarkably improved.

The invention provides a metal type flux-cored wire, a bimetal composite pipe for high-pressure hydrogen storage and transportation and a preparation method of the bimetal composite pipe. In the metal type flux-cored wire, a flux core comprises the following components in percentage by mass: 26%-34% of Cr powder, 12%-20% of Fe50Ni50 powder, 4.5%-9.5% of Fe20Mn80 powder, 1.0%-2.0% of Fe30Si70 powder, 0.20%-0.30% of CeN powder, 0.40%-0.50% of NbN powder, less than or equal to 0.1% of Re2O7 powder and the balance of Fe powder; the outer skin is a 314 austenitic stainless steel strip and comprises the following alloy components in percentage by mass: 24%-26% of Cr, 19%-21% of Ni, 1%-2% of Mn, 2%-3% of Si, 0.08%-0.10% of C, less than or equal to 0.0012% of S, less than or equal to 0.010% of P and the balance of Fe. The metal type flux-cored wire can be used for preparing a bimetal composite pipe used in a high-pressure or corrosive environment.

According to the production method of the hot-rolled extra-thick and ultra-wide double-metal composite plate, S30403 is selected as a stainless steel layer, and the stainless steel layer comprises the following chemical components in percentage by mass: 0.02%-0.029% of C, 0.3%-0.5% of Si, 0.8%-1.0% of Mn, less than or equal to 0.04% of P, less than or equal to 0.005% of S, 18.0%-18.8% of Cr, 8.0%-8.2% of Ni and the balance of Fe and inevitable impurities; the base layer is made of Q355B low-alloy high-strength steel and comprises the following chemical components in percentage by mass: 0.06%-0.12% of C, 0.15%-0.3% of Si, 1.45%-1.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.02%-0.05% of Al, 0.008%-0.02% of Ti and the balance of Fe and inevitable impurities; the key process steps comprise assembling, heating, rolling, cooling and finishing, and industrial preparation of the high-performance bimetal composite plate with the width larger than 3.5 m, the total thickness not smaller than 100 mm, the base material larger than or equal to 90 mm and the stainless steel coating larger than or equal to 10 mm is achieved.

The application provides a double-metal composite drill rod with a special-shaped section and a manufacturing process thereof, and the double-metal composite drill rod with a special-shaped section comprises a steel-aluminum special-shaped section composite rod body, the steel-aluminum special-shaped section composite rod body comprises a steel outer tube, and an aluminum alloy inner tube is arranged in the steel outer tube; an inner-outer tube special-shaped torsion transmission section transmission structure is adopted between the aluminum alloy inner tube and the steel outer tube; or a special-shaped connecting pin torsion transmission structure is adopted between the aluminum alloy inner tube and the steel outer tube. The double-metal composite drill rod with a special-shaped section fully utilizes the high strength and wear resistance of steel and the high specific strength and corrosion resistance of light alloy, adopts a mechanical composite process, forms a light double-metal composite drill rod with a special-shaped section and a processing technology, and has the comprehensive performance of light weight, high strength, good processing performance, low cost, corrosion resistance and good wear resistance.

This utility model discloses an oil-free lubricated bearing plate, comprising a bimetallic plate composed of a base metal plate and a sintered metal plate. Graphite insertion holes are equidistantly distributed on the bimetallic plate. A first slot is equidistantly formed on the side of the base metal plate closest to the sintered metal plate, and a first locking strip is fixedly connected to the side of the sintered metal plate corresponding to the first slot. In the production of this utility model, the base metal plate is pre-processed to form the first slot and the second locking strip. Alloy powder is then spread evenly on the base metal plate, and the base metal plate and the sintered metal plate are bonded together through sintering. The pre-processed first slot and second locking strip ensure a tight bond between the base metal plate and the sintered metal plate, greatly enhancing the bonding strength and preventing cracks from appearing between them.

The invention belongs to the technical field of bimetal composite pipe blank making, and particularly relates to bimetal pipe metallurgy composite blank making equipment and a blank making method. The device at least comprises a rotatable base; the hollow cylindrical shell is vertically arranged and is fixedly assembled on the upper surface of the base; the supporting seat is fixedly arranged below the center of the hollow cylindrical shell and is rotationally connected with the base; and the forging and pressing mechanism is arranged above the supporting seat. By means of the method, metallurgical bonding of the outer-layer carbon steel base body and the inner-layer corrosion-resistant alloy layer of the bimetal composite blank can be effectively achieved, the bonding strength of the outer-layer carbon steel base body and the inner-layer corrosion-resistant alloy layer is ensured, and a good foundation is laid for follow-up pipe manufacturing procedures such as punching forming and rolling of the blank.

This invention discloses a SiC-supported LDH nanocomposite material, its preparation method, and its application as a microwave absorbing and corrosion-resistant material. The SiC-supported LDH nanocomposite material has a core-shell structure, wherein the core is silicon carbide nanowires and the shell is a layered bimetallic hydroxide doped with a third metal. nw The loading of the third metal-doped layered bimetallic hydroxide is 43.1%–168%. This invention improves the microwave absorption performance of the composite material by adjusting the LDH shell content and doping the LDH with cobalt to form a ternary LDH. Furthermore, the core-shell structure of the SiC-loaded LDH nanocomposite not only provides multiple scattering conditions for microwaves but also acts as a physical barrier, extending the corrosion path and acting as a labyrinth effect to hinder the intrusion of corrosive media. Moreover, the LDH memory effect and anion exchange effect further resist chloride ion intrusion, achieving a lightweight, integrated application of microwave absorption and corrosion protection.

The invention discloses a thin metal strip preparation method and a thermal bimetal composite strip, and the method comprises the following steps: adopting a vacuum induction melting process to smelt all raw materials in a preset proportion to obtain alloy liquid with preset components, and pouring in a protective atmosphere to obtain an alloy ingot; the alloy cast ingot is sequentially subjected to forging, hot rolling, acid pickling and surface coping treatment, and an intermediate steel coil is obtained; the middle steel coil is subjected to multi-pass cold rolling, a strip is obtained, multi-pass cold rolling is executed through a preset deformation sequence, and at least one time of middle solution annealing treatment is conducted in the multi-pass cold rolling process; and the strip is subjected to final cold rolling and finished product solution annealing treatment, and the metal thin strip for the passive layer of the thermal bimetal composite strip is obtained. The alloy components and the purity are accurately controlled by adopting vacuum induction melting, and the corrosion resistance and the stability of thermal expansion and resistivity of the passive layer thin strip are improved by combining the multi-pass cold rolling with the preset deformation sequence and the intermediate solution annealing process.

The present application relates to the technical field of welding of metal materials, and particularly relates to a method for realizing steel-copper alloy double-metal connection of a plunger cap and a product, which comprises a steel plunger cap base body after mechanical processing and quenching and tempering heat treatment, a copper alloy plunger cap lining plate; setting process parameters of a friction welding machine tool; clamping the steel plunger cap base body and the copper alloy plunger cap lining plate in the friction welding machine tool; starting the friction welding machine tool, the steel plunger cap base body approaching the copper alloy plunger cap lining plate, the two abutting surfaces being attached, and then friction welding is performed; after the friction welding is completed, the obtained steel-copper alloy double-metal connected plunger cap blank is cooled; turning processing is performed on the plunger cap blank; the plunger cap blank is detected to check the steel-copper alloy double-metal connection interface welding condition of the plunger cap blank after the friction welding; at least one sample of the plunger cap is extracted for metallographic detection, the steel-copper alloy double-metal connection interface morphology of the plunger cap blank is observed, and the welding depth of copper to the steel base body is measured.

This invention relates to the field of intelligent rolling technology, and discloses an intelligent rolling method and system for aluminum-based bimetallic bearing materials based on three-roll differential rolling. The method includes: acquiring real-time multidimensional variable data of three-roll differential rolling; obtaining principal component eigenvectors by dimensionality reduction after normalization and principal component analysis; constructing a reconstruction matrix and calculating the squared Euclidean norm of the residual matrix as the squared prediction error value; analyzing the contribution if the error exceeds a threshold, locating the precise coordinates of the profile deviation; maintaining the original parameters if the error does not exceed a threshold; generating adjustment parameters and compensation commands through a roll elastic deformation model based on the mill geometric data, and outputting them to the drive system; calculating the dynamic following error, performing secondary compensation for exceeding the threshold, and finally obtaining optimized rolling parameters. This method can achieve precise positioning and targeted compensation of rolling profile deviation, ensuring stable product quality.

This invention discloses a bimetallic composite self-lubricating bushing and its preparation method, comprising an outer layer and an inner layer. The outer layer is made of steel, and the inner layer is made of copper alloy. The inner wall of the outer layer is provided with multiple mating grooves, which are arranged in multiple layers along the axial direction of the outer layer. Adjacent mating grooves are spaced apart, and each layer includes multiple annularly spaced mating grooves. The inner layer is located within the mating grooves. Each mating groove includes a tip and a tail. The tips of adjacent mating grooves face opposite directions, and the distance between two adjacent mating grooves is the same as the groove width. The multi-layer mating groove structure of this invention, through centrifugal casting, achieves bimetallic interlocking and increases the metallurgical bonding area of ​​the staggered triangular straight mating groove structure with adjacent layers of tips facing opposite directions, significantly improving the interfacial bonding force of the bimetallic composite bushing.

Aspects of the subject technology relate to tools, system and methods related to a drilling tool that is fabricated using a bimetallic member that is subjected to an infiltration process. The method can include having an amount of precipitation hardenable steel and an amount of another type of steel. The precipitation hardenable steel and the other type of steel are metallurgically bonded to form a bimetallic member including a casting mandrel portion and a drill string connection portion. A reinforcing powder is infiltrated with a binder while in contact with the casting mandrel portion to form a metal matrix composite about the casting mandrel portion. A cutting structure is fabricated into the metal matrix composite of the drilling tool.

This utility model relates to the field of cold welding machine technology, specifically a three-station bimetallic cold forging composite contact automatic welding machine. It mainly includes a support frame, with a protective shell at the top. Feeding components are connected to the left and right sides of the front end of the protective shell. A bottom mold and a wire inlet mold are located at the front of the protective shell, and cutting components are located on both the left and right sides of the front end. A linkage turntable is located on the left rear end of the protective shell, and a transmission gear set is located on the right side of the protective shell. This three-station bimetallic cold forging composite contact automatic welding machine, through the cooperation of a rotation adjustment component, an intermittent lifting component, a moving support component, and a stamping station component, processes the product at multiple stations, resulting in a uniform silver layer distribution and stronger bonding strength. The processing is monitored by an imaging device, and the machine automatically stops immediately upon detecting material shortage, material depletion, overlapping of products, or broken needles, thus preventing further losses.

A kind of mining bimetallic sprocket and manufacturing method, including the following steps, using three fire forging forming mode to the bimetallic profile blank is forged treatment;The sprocket of forging forming is normalized;After the sprocket blank of normalizing is sprocket rough machining tooth groove, inner hole, outer circle, end face;The base body of sprocket is quenched and tempered heat treatment;Outer circle of sprocket base body, tooth type semi-finishing;Finish machining gear.The sprocket piece material of the application can satisfy that sprocket appearance hardness is lower, wear resistance is higher, not easy to wear during use.Connection sleeve material can satisfy that sprocket appearance hardness is lower inner hole hardness is softer, easy to gear.Adopt blank 3 fire forging process, can make blank internal grain refinement.

This invention relates to the field of oil casing for energy exploration and development, and provides an integral metallurgical composite bimetallic tubing and its manufacturing process. The process includes: S1: performing a first external upsetting on the first end of the tubing, after which the outer surface dimensions of the tubing end meet the requirements of the outer diameter of the internal threaded joint, and the inner surface of the tubing end is conical; S2: performing a second upsetting on the internal threaded joint section of the first end, after which the outer surface dimensions of the first end of the tubing remain unchanged, the inner surface is conical, and the thickness of the corrosion-resistant alloy layer on the inner surface increases linearly from the end face along the axial direction inward; S3: performing overall heat treatment; S4: machining the internal thread on the first end of the tubing; S5: machining the external thread on the second end of the tubing. This invention forms a corrosion-resistant alloy torque shoulder at the thread end of the internal threaded joint, solving the problem of corrosion resistance treatment at the internal thread end of the corrosion-resistant alloy tubing thread; it eliminates the need to use corrosion-resistant alloy welding to form a corrosion-resistant alloy layer at the internal thread end, effectively reducing tubing production costs and improving production efficiency.

This invention relates to the field of supercapacitor electrode materials, particularly bimetallic materials, and more specifically to nitrogen-doped nickel-cobalt bimetallic porous carbon composite materials, their preparation, and applications. The nitrogen-doped nickel-cobalt bimetallic porous carbon composite material is obtained by synthesizing a precursor via a hydrothermal method using 1,2,4-triazole-3-carboxylic acid as a ligand, followed by calcination at 600℃. This composite material contains abundant redox active sites and excellent conductivity, especially exhibiting excellent electrochemical performance under a 1:1 nickel-cobalt molar ratio. Experiments show that when the nickel-cobalt molar ratio is 1:1 during MOF synthesis, the obtained NC / NiCo1 / 1 exhibits excellent electrochemical performance at a mass ratio of 1.0 A g. ‑1 Below this, the specific capacitance can reach 595.76 F g. ‑1 It also exhibits excellent cycling performance, retaining 92.30% of its specific capacitance after 3000 cycles, and its specific surface area can reach 68.87 m². 2 g ‑1 .

This invention relates to the field of oilfield equipment monitoring technology, specifically proposing a structure and method for monitoring corrosion inside a bimetallic composite plate pressure vessel. The structure includes an inner section and an outer section. The inner section is installed inside the pressure vessel, and its thickness is the same as that of the inner layer of the pressure vessel. The outer section covers the inner wall of the inner section. An anti-corrosion layer is applied to the outer wall of the outer section. Blind holes and through holes are adjacently formed on the outer wall of the inner section, with the end of the through hole near the outer section abutting against the inner wall of the outer section. By detecting the blind holes and through holes in the inner section, the corrosion status of the pressure vessel's inner layer can be deduced. Since grinding or welding repair of the inner section is unnecessary, it avoids affecting the subsequent normal operation of the pressure vessel. Furthermore, it overcomes the shape limitations of the pressure vessel itself, reduces errors in the detection results, and ensures the accuracy of the calculated corrosion rate of the pressure vessel's inner layer.

A carrierless bimetallic particulate material comprising elemental metallic silver and elemental metallic ruthenium having an average particle size (d50) in the range of 1 to 100 μm, preferably 1 to 20 μm and comprising a silver: ruthenium weight ratio in the range of 1 to 2000 parts by weight of silver: 1 part by weight of ruthenium.

A method for seamless bimetallic bonding includes a roughening step, a forming step, and a welding step. The roughening step involves preparing a first metal block and a second metal block, and roughening the surfaces of both. The forming step involves preparing a mold with a lower mold and a mold cover, placing the first metal block into the lower mold, and forming a connecting unit, a first tip, and a second tip made of polymer material on the first connecting surface of the first metal block. The welding step involves using the mold cover to press the second metal block and performing ultrasonic welding to form a bonded block. This invention uses ultrasonic welding to melt the first tip and the second tip, filling the gap between the first metal block, the second metal block, and the connecting unit to achieve a seamless bond.

The invention discloses a rolling composite low-cost anti-oxidation pretreatment method for a heterogeneous bimetal composite pipe, and belongs to the technical field of metal material composite machining. The method comprises the following steps: polishing, cleaning and drying a to-be-compounded surface of the bimetal composite pipe, and removing an oxide layer, oil stains and other impurity attachments on the to-be-compounded surface; the two metal composite pipes are sleeved together according to the structure that the metal with the large thermal expansion coefficient serves as an inner covering layer, and the metal with the small thermal expansion coefficient serves as an outer layer, and a combined pipe blank is formed; and the interference fitting temperature of the metal pipe to be compounded is determined through calculation, the combined pipe blank is placed in a heating furnace to be heated to the interference fitting temperature, heat preservation is conducted for a certain time, and interference fitting of the combined pipe blank is achieved. According to the method, the inner-layer metal pipe and the outer-layer metal pipe are tightly attached through heating, air is exhausted, and the problem that the interface of the combined pipe blank is oxidized is effectively avoided. The method is simple in process, low in equipment requirement, outstanding in cost advantage and suitable for anti-oxidation pretreatment of heterogeneous metal pipe industrial rolling composite production.

This utility model discloses a sheet metal shearing device for processing bimetallic rolled bushings, including a base. A bracket is fixedly installed on the top of one side of the base, and first hydraulic rods are symmetrically installed on the top of the brackets. A lifting plate is installed on the bottom of the first hydraulic rod corresponding to the inner side of the bracket, and a shearing blade is installed at the bottom of the lifting plate. When the cutting edge of the shearing blade needs to be sharpened, the first hydraulic rods drive the shearing blade to rise. A drive mechanism then drives a bracket to reciprocate. When the bracket drives a grinding plate to press against the end of the shearing blade, the inclined side of the grinding plate causes the grinding plate and mounting plate to move against the spring force towards the support plate. The grinding plate, through the spring, presses against both sides of the shearing blade. The movement of the grinding plate sharpens the cutting edge of the shearing blade. This sheet metal shearing device allows for maintenance of the shearing blade without disassembly, effectively shortening the maintenance time and improving the shearing efficiency of the sheet metal.

The application discloses a copper-zinc bimetallic organic metal framework compound and a synthesis method and application thereof, and is based on a hydrothermal solvent method and a strong alkali compound surface layer activation process to prepare a novel porous composite material, and the specific steps comprise zinc-based "core" layer MOF material synthesis, surface strengthening activation of the core layer material by using a strong alkali, copper-based loading, in-situ growth of a "shell" layer MOF, and application of the material to CO2 adsorption and capture; the optimal sample has a CO2 adsorption capacity of up to 151.8 cm 3 / g under normal temperature and pressure, a CO2 gas adsorption capacity of up to 271.2 cm 3 / g in a high pressure section, a separation coefficient of the material for 400 ppm CO2 / N2 is up to 26.34, a separation coefficient of the material for 40 / 60 v / v CO2 / H2 is up to 141.07, and after an adsorption-desorption cycle test, the adsorption capacity performance is still retained to be not less than 95%, compared with a traditional single-metal MOF material, the method can significantly improve the adsorption separation performance and stability of the material.

The invention belongs to the technical field of catalysts, and particularly relates to a bimetal MIL-53-derived porous composite metal oxide material and a preparation method thereof, a propane dehydrogenation catalyst prepared from the bimetal MIL-53-derived porous composite metal oxide material and application of the propane dehydrogenation catalyst. Comprising the following steps: carrying out hydrothermal reaction on aluminum salt, gallium salt and 1, 4-terephthalic acid; carrying out solvent heat treatment on the hydrothermal reaction product, and washing to obtain a bimetallic MIL-53 precursor; the preparation method comprises the following steps: preparing a bimetallic MIL-53 precursor, sequentially calcining the bimetallic MIL-53 precursor in an inert atmosphere and an oxidizing atmosphere to obtain a porous composite metal oxide material, introducing H2 in a nitrogen atmosphere for reduction, and calcining the porous composite metal oxide material in air to obtain the composite metal oxide catalyst. Gallium oxide clusters can be prevented from being formed, it is guaranteed that gallium oxide is evenly dispersed in the material, and meanwhile generation of an active species GaIV is promoted.

The utility model discloses a casting forming mould for preparing a bimetal composite hammerhead, and relates to the technical field of crusher hammerhead casting, the casting forming mould comprises a base, the top of the base is provided with a fixed mould and a screw rod, the top of the base is connected with a sliding frame in a sliding mode in the front-back direction, the sliding frame is connected to the screw rod in a threaded mode, and the fixed mould is connected with the screw rod in a sliding mode. The sliding frame is connected with the movable mold, and cavities are formed in the opposite sides of the fixed mold and the movable mold. The feeding pipe is stably inserted through the inserting groove, molten metal is injected through the connecting pipe, the molten metal can flow into the cavity through the inclined runner after flowing through the feeding pipe, and when the inclined runner does not need to be used for liquid injection, the plugging rod moves along the feeding pipe to enter the inclined runner to be aligned with the cavity, and then the inclined runner can be plugged. Therefore, after the liquid level of molten metal is higher than the inclined runners on the two sides, the molten metal cannot enter the inclined runners, protruding structures on the two sides of the formed hammer head are avoided, and forming of the hammer head is guaranteed.

The preparation method comprises the steps that a high-strength steel bar serves as a core material, a corrosion-resistant pipe serves as a wall material, and transition middle layers such as a Ni-P layer, a pure Cu layer and a Ni-Cu alloy layer are deposited on the outer wall of the core material and / or the inner wall of the wall material; the core material is coaxially inserted into the wall material, the two ends of the core material and the two ends of the wall material are welded and sealed, and a blank material is formed; the blank is heated to a preset temperature and then subjected to hot rolling compounding, and a bar is formed; the bar is subjected to annealing treatment, and a bolt blank is formed; and rolling threads on the bolt blank to obtain the bimetal composite bolt. The transition intermediate layer is used as an intermediate layer barrier and buffer to prevent severe mutual diffusion of metal elements in the hot working process, generation of brittle intermetallic compounds is inhibited, thermal expansion matching and residual stress are controlled, and the thermal expansion performance is improved. And the risk of interface fatigue cracking caused by superposition of residual stress and working stress in the service process is reduced, and high strength and high corrosion resistance are both considered.

The invention relates to the technical field of battery materials, and discloses a positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: mixing a lithium source, a positive electrode precursor material and a composite nanosheet, and sintering to obtain the positive electrode material, the composite nanosheet comprises a carbon material and bimetallic sulfide loaded on the carbon material, and metal elements in the bimetallic sulfide comprise a nickel element and a cobalt element. According to the preparation method of the positive electrode material provided by the invention, the composite nanosheet is introduced, and the carbon material in the composite nanosheet and the bimetallic sulfide cooperate with each other to jointly improve the conductivity, the charge transfer speed, the structural stability and the integrity of the positive electrode material, so that the capacity performance and the cycle stability of the battery running on a high-voltage platform are improved.

The present disclosure relates to a water splitting catalyst including a porous carbon layer, a bimetallic metal alloy core dispersed on the porous carbon layer, and a single-atom precious metal dispersed on the bimetallic metal alloy core, in which oxygen is adsorbed on the surface of the bimetallic metal alloy core.