19221 results about "Alloy" patented technology

The invention provides an electromagnetic-assisted nickel-based alloy laser melting deposition crack inhibition method and system, relates to the technical field of automatic control, constructs an intelligent control system, carries out deep fusion and real-time prediction on multi-source heterogeneous sensing data, generates a prediction result, sets a reward function and an action-value network, and improves the performance of the nickel-based alloy laser melting deposition crack inhibition system. Solving to obtain an optimization control strategy and analyzing and outputting the optimization control strategy; and constructing a three-dimensional electromagnetic field distribution matrix. In combination with real-time feedback of the shape of the molten pool, the molten pool is stimulated to flow directionally and oscillate non-linearly according to the resonance effect, oscillation parameters are obtained, thermodynamic behaviors corresponding to the molten pool are predicted according to the oscillation parameters, and a thermodynamic prediction result is fed back to the central control unit; the method comprises the following steps: detecting the surface appearance of a part, extracting defect characteristic parameter vectors, inverting defect influence factors, generating a dynamic regulation and control curve, dispersing the dynamic regulation and control curve into multi-dimensional control instruction vectors, updating a preset regulation and control model, outputting optimized regulation and control model parameters, and carrying out crack suppression operation again.

The invention provides a rapid welding storage battery busbar structure and a manufacturing process, and relates to the field of lead-acid storage batteries, the rapid welding storage battery busbar structure comprises a plate group, a non-lead metal strip, a non-lead metal positive terminal and a non-lead metal negative terminal, the non-lead metal strip and the non-lead metal positive terminal are made of metal or alloy with the conductivity higher than that of lead, and the non-lead metal strip is electrified to be rapidly heated and is welded with the cluster group tab and the non-lead metal positive and negative terminals at the same time, and after being firmly welded, the non-lead metal strip is cut to form a busbar and is sealed by glue. According to the lead-acid storage battery, metal with the conductivity higher than that of lead is adopted to replace lead and lead-based alloy to serve as the busbar of the lead-acid storage battery, the gravimetric specific energy of the lead-acid storage battery is improved, the material cost of the lead-acid storage battery is reduced, the mode of welding by heating the metal strip is adopted to replace the technology of manufacturing the busbar through hot melting of lead, the production efficiency is improved, and the energy consumption is reduced; meanwhile, clean production is achieved, and lead pollution in the traditional production process is avoided.

The invention discloses a steel wire rod for a 2200-2260 MPa grade ultrahigh stress corrosion resistance prestressed steel strand, the steel strand and a production method of the steel strand, and the steel wire rod comprises the following alloy components in percentage by mass: 0.83-0.89% of C, 0.60-1.40% of Si, 0.20-0.80% of Mn, 0.15-0.50% of Cr, less than 0.30% of Cu, less than 0.30% of Ni, less than 0.30% of Mo, 0.01-0.05% of V, 0.001-0.05% of Nb, less than or equal to 0.008% of S, less than or equal to 0.010% of P, less than or equal to 0.0040% of N, less than or equal to 0.0020% of O and the balance of Fe and other inevitable impurities, through component design and a reasonable after-rolling controlled cooling process, the microstructure is refined, the sorbite rate is improved, high strength and plasticity are obtained with low carbon content, the drawing deformation can be reduced, material damage can be reduced, and the corrosion resistance of the steel strand is improved.

The invention relates to the technical field of electrolytic refining, and provides an electrochemical device and method for extracting metal from molten salt. The electrochemical device comprises an anode, a cathode, an insulating container, an electrolytic bath and an ultrasonic stirring device. The cathode comprises a conductive part and liquid metal; the insulating container is provided with a containing space, the top side of the containing space is open, the liquid metal is contained in the containing space, and a part of the conductive part is inserted into the liquid metal; the electrolytic bath is provided with a containing cavity used for containing molten salt, the insulating container can be used for being immersed in the molten salt so that liquid metal can make contact with the molten salt, and one part of the anode is used for being inserted into the molten salt; a portion of the ultrasonic stirring device is inserted into the liquid metal for oscillating the liquid metal. The liquid metal is subjected to ultrasonic oscillation in the electrolysis process, so that the possibility that metal dendrites are formed on a reduction product or a high-melting-point alloy layer is formed on the surface of the liquid metal is effectively reduced, the reaction efficiency of electrolytic extraction is improved, and the quality of the extracted reduction product is improved.

The invention relates to the field of numerical control machining, discloses a numerical control machining method and system integrating thermal expansion dynamic compensation, and aims to solve the problem that precision is out of control due to thermal deformation in high-speed cutting of motorcycle light alloy castings. The method comprises the steps that distributed temperature and displacement sensors are arranged in a key area of a workpiece, and a temperature field and thermal expansion amount are collected in real time; constructing a local thermal deformation prediction model based on a material expansion coefficient and a geometric structure, and correcting a tool path in real time through a coordinate system dynamic offset algorithm; and an on-line measurement feedback mechanism is introduced, and model parameters are adaptively optimized, so that closed-loop compensation is realized. The system comprises a sensing module, a thermal deformation modeling and compensation calculation module, a coordinate dynamic correction module, an online measurement feedback module and a parameter adaptive updating module. Through millisecond-level dynamic compensation and closed-loop self-optimization, the size precision and form and position stability of the complex thin-wall part under the high-temperature working condition are remarkably improved, the rejection rate and cooling energy consumption are reduced, and the method is suitable for a high-precision batch machining scene.

The invention relates to the technical field of alloy die-casting, and particularly discloses an alloy die-casting temperature field control method and system capable of reducing hot cracks, temperature gradients of different areas of a die are adjusted in real time according to flowing and solidification characteristics of alloy liquid, so that the surface temperature distribution of the die is matched with the solidification rate of the alloy liquid, and the alloy die-casting temperature field is controlled. Utilizing a machine learning algorithm to predict a risk area where hot cracks are generated on the basis of historical data and real-time monitoring data, and dynamically adjusting the flow velocity of a cooling system, the heating power of a die or die-casting process parameters according to a prediction result; through dynamic temperature gradient control, intelligent prediction and feedback control, a cooling strategy, a stress release mechanism and a real-time monitoring and optimizing process, thermal stress concentration can be effectively reduced, the possibility of generation of thermal cracks is reduced, the yield of castings is improved, the cooling time of the castings can be shortened through the cooling strategy, and therefore the production efficiency is improved, and the production cost is reduced. And reworking and scrapping of castings are reduced.

The invention relates to a 1500MPa-grade nickel-based alloy for a second-generation high-temperature superconducting baseband and a preparation method of the 1500MPa-grade nickel-based alloy, and belongs to the technical field of materials. The nickel-based alloy comprises the following chemical components in percentage by weight: 15.0 to 17.0 percent of Cr, 15.0 to 17.0 percent of Mo, 4.5 to 9.5 percent of W, 5.0 to 7.0 percent of Fe, 0.3 to 0.7 percent of Mn, 0.01 to 0.05 percent of Si, 0.1 to 0.2 percent of V, 0.1 to 0.5 percent of Co, 0.1 to 0.2 percent of Al, 0.001 to 0.01 percent of B and Clt, 0.005%, Plt; 0.005%, Slt; 0.002%, Olt; 0.002%, Nlt; 0.002%, and the balance being nickel. On the basis of hastelloy, the strength of a matrix is improved by increasing the W element content, matching an optimized heat treatment process and combining cold deformation; the content of C is controlled, precipitation of carbides is controlled, and it is ensured that the carbides are completely dissolved in a matrix during homogenization treatment; and a pure smelting process is adopted, so that the oxygen content in the alloy is reduced, the inclusion content is controlled, and high purity is ensured. By adopting the component control strategy and the processing preparation and heat treatment process, the nickel-based alloy with the yield strength of 1,300 MPa or above, the tensile strength of 1,500 MPa or above and the ductility of 7.5% or above can be obtained after annealing is conducted for 5 min at the temperature of 900 DEG C, and the requirement of a second-generation high-temperature superconducting high-performance metal base band is met.

The invention discloses an automatic welding device for a rotary alloy furnace tube, and belongs to the technical field of arc welding equipment.The automatic welding device for the rotary alloy furnace tube comprises a base and a U-shaped bin located at the top of the base, and the two ends of the interior of the U-shaped bin are jointly provided with a centering clamping mechanism used for clamping the outer side of the furnace tube; a driving mechanism for providing power for the centering clamping mechanism to clamp the furnace tube is arranged on the outer side of the centering clamping mechanism, and a welding mechanism is arranged on the inner top of the U-shaped bin. A local sealing design is adopted for the inflation mechanism, the annular air bag is attached to the inner wall of the furnace tube after being inflated, an independent cavity communicated with the outside only through a welding seam gap is formed near the welding seam, the protection requirement can be met only by filling the local space with argon, the whole furnace tube or a large-range external space does not need to be filled, and compared with traditional overall argon filling, the argon filling efficiency is greatly improved. The argon consumption is greatly reduced, the industrial gas purchase cost is remarkably reduced, and the production cost investment is reduced.

The invention discloses super high-strength and high-toughness steel and a preparation method thereof. The super high-strength and high-toughness steel comprises the following components in percentage by mass: 0.18 to 0.35 percent of C, 0.05 to 0.12 percent of Si, 0.30 to 0.50 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.008 percent of S, 0.8 to 1.5 percent of Cr, 0.10 to 0.30 percent of Mo, 2.5 to 3.5 percent of Ni, 0.05 to 0.12 percent of V, 0.01 to 0.05 percent of RE and the balance of Fe. When the content of C is not higher than 0.25%, the alloy contains 0.0005-0.003% of B and the balance of Fe and other inevitable impurities; the preparation process comprises the steps of smelting, homogenization treatment and blank opening, intermediate annealing treatment, large-deformation warm rolling, subzero treatment and low-temperature tempering treatment. The medium-carbon martensite super-high-strength and high-toughness steel with a large enough metastable austenite phase region is obtained through component design, conventional equipment and a production process are utilized for tissue regulation and control, the size of a martensite block is refined to about 1 micron, and the comprehensive mechanical property of the medium-carbon martensite steel is remarkably improved. The material prepared by the invention has ultrahigh strength and high toughness, and is easy for industrial large-scale production and lower in cost.

The invention discloses a 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate and a manufacturing method thereof, and the 500MPa-grade supercritical CO2 corrosion-resistant pipeline coil plate comprises the following chemical components: 0.05 to 0.10 percent of C, 0.6 to 0.9 percent of Si, 1.50 to 1.70 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 0.10 to 0.30 percent of Cr, 0.35 to 0.45 percent of Mo, 0.03 to 0.05 percent of Nb, 0.01 to 0.03 percent of Ti, 0.02 to 0.05 percent of Al, 0.20 to 0.30 percent of Co, less than or equal to 0.008 percent of N, 1.2 to 4.3 percent of Mo / Cr, 0.75 to 0.92 percent of Mo + Cr + Co, 2.8 to 3.9 percent of Si / Co and the balance of Fe and inevitable elements. The manufacturing method comprises the steps of smelting, slab continuous casting, continuous casting slab heating, rolling, cooling and coiling. In the transverse direction of the rolled plate, Rt0.5 is larger than or equal to 540 MPa, Rm is larger than or equal to 640 MPa, Rt0.5 / Rm is smaller than or equal to 0.87, A50 mm is larger than or equal to 36%,-40 DEG C impact energy KV8 is larger than or equal to 220 J, and-20 DEG C drop weight DWTT is larger than or equal to 95%; in the longitudinal direction, Rt0.5 is larger than or equal to 520 MPa, Rm is larger than or equal to 630 MPa, Rt0.5 / Rm is smaller than or equal to 0.86, and A50mm is larger than or equal to 38%; the average corrosion rate in a 14.5 MPa supercritical CO2 environment is 1t; and 0.05 mm / a. The low-carbon medium-manganese molybdenum-chromium-cobalt-containing alloy design is adopted, the low-temperature toughness of a weld joint is guaranteed, the CO2 corrosion resistance and the oxidation resistance are improved, and higher safety is achieved in pipeline engineering.

The invention provides a preparation method of laser cladding heterostructure stainless steel. According to the method, dried stainless steel pre-alloyed powder is subjected to laser melting deposition to form heterostructure stainless steel alloy with cross deposition of coarse grains and fine grains; the grain size of the fine crystal is 3-6 [mu] m, and the structure of the fine crystal layer is an equiaxed structure; the grain size of the coarse crystal is 20-50 [mu] m, and the structure of the coarse crystal layer is a columnar crystal formed along the Z axis. According to the method, the specific coarse grain / fine grain cross deposition heterostructure is presented in the stainless steel by changing the deposition layer process parameters and the scanning path, the material strength is improved while the material ductility is guaranteed, and the alloy has the excellent mechanical property.

The invention relates to a hot-rolled wire rod for a 2260MPa-grade stranded wire and a manufacturing method of the hot-rolled wire rod, after the high-carbon component design of C-Si-Mn-Cr-Mo-Nb-Al is adopted for rolling and spinning to form the wire rod, online molten salt isothermal toughening treatment is carried out, so that the wire rod is firstly subjected to front-section molten salt treatment and is rapidly cooled, and enters a sorbite phase region from an austenite state to form a structure taking a sorbite structure as a main structure; and then carrying out rear-section molten salt treatment, reducing the circulation volume of molten salt, promoting the unconverted retained austenite to be continuously converted into sorbite, carrying out isothermal tempering, promoting fusing of a part of sorbite lamellar layers, and finally carrying out slow cooling through a roller way, so as to prepare the hot-rolled wire rod of which the microscopic structure comprises a mixed structure consisting of tempered sorbite, ferrite and fused sorbite, the tensile strength can reach 1534-1584 MPa, the percentage reduction of area can reach 33%-38%, and the alloy can be used in the application fields of manufacturing 2260 MPa grade stranded wires and the like without additional heat treatment procedures.

The invention discloses a high-strength silver-free copper-based brazing filler metal which is composed of P, Sn, Ni and Cu. The high-strength silver-free copper-based brazing filler metal is low in cost, safe, environmentally friendly and good in welding effect; through the adding of Sn and Ni, the melting point of brazing filler metal alloy is reduced, and the tensile strength and wettability of the brazing filler metal alloy are enhanced.

The invention relates to the technical field of ceramic substrates, and provides a high-toughness multilayer ceramic substrate and a preparation method thereof. Raw materials of the high-toughness multilayer ceramic substrate comprise the following components in parts by weight: 90-95 parts of aluminum oxide, 13-17 parts of a sintering aid, 2-5 parts of a plasticizer, 1-3 parts of a dispersant, 3-5 parts of a binder, 10-12 parts of an aid and 55-65 parts of water, the auxiliaries comprise boron carbide, copper-tin alloy powder and graphene oxide. According to the technical scheme, the problem of poor toughness of the multi-layer ceramic substrate in the prior art is solved.

The invention discloses a cold-resistant and damp-heat-resistant PETG / PP alloy floor base material and a preparation method thereof, and a floor and a preparation method thereof. The floor base material comprises the following raw materials in parts by mass: 5-20 parts of PETG resin, 2-8 parts of PP resin, 1-5 parts of a compatilizer, 3-10 parts of a flexibilizer, 20-70 parts of calcium carbonate, 3-10 parts of a modified inorganic fibrous filler, 0.2-2 parts of a chain extender, 1-3 parts of a lubricant, 0.5-2 parts of an antioxidant and 0.5-3 parts of an anti-hydrolysis agent. According to the cold-resistant and damp-heat-resistant PETG / PP alloy floor base material and the preparation method thereof as well as the floor and the preparation method thereof, the dimensional stability, cold resistance and damp-heat resistance of a polyester environment-friendly floor material can be improved.

The invention relates to a 1300MPa-grade nickel-based alloy for a second-generation high-temperature superconducting baseband and a preparation method of the 1300MPa-grade nickel-based alloy, and belongs to the technical field of materials. The high-strength wear-resistant steel comprises the following chemical components in percentage by weight: 15.0%-17.0% of Cr, 15.0%-17.0% of Mo, 3.0%-4.5% of W, 5.0%-7.0% of Fe, 0.3%-0.7% of Mn, 0.01%-0.05% of Si, 0.1%-0.2% of V, 0.1%-0.5% of Co, 0.1%-0.2% of Al, 0.040%-0.080% of N, Clt and the balance of Fe. 0.002%, Plt; 0.005%, Slt; 0.002%, Olt; 0.002%, and the balance being nickel. The purification smelting process is adopted, the oxygen content in the alloy is reduced, the inclusion content is controlled, and the high purity of the material is guaranteed. By adopting the component control strategy, the heat treatment process and the final cold machining preparation, the nickel-based alloy with the yield strength being 1100 MPa or above, the tensile strength being 1300 MPa or above, the ductility being 15% or above and the product of strength and elongation being 20 GPa.% or above can be obtained after annealing is conducted for 5 min at the temperature of 900 DEG C, and the requirements of a second-generation high-temperature superconducting high-performance metal base band are met.

The invention belongs to the technical field of solid-liquid phase change heat dissipation, and discloses a memory alloy-based phase change expansion buffer structure, which comprises an elastic structure, a supporting structure, a thin wall, a cavity, a flaring, an electronic device, a heat sink, fins, a connecting structure and a phase change material, the thin wall is made of shape memory alloy and separates the internal cavity and the external phase-change material, the internal cavity is communicated with the external environment through the flaring, and in the flying process of the aerospace vehicle, external airflow flows into the flaring to take away heat stored by the phase-change material continuously. Based on the shape memory function of the memory alloy, additional space expansion buffering can be provided for the phase change material when the temperature changes, and stress damage caused by phase change expansion is avoided. The memory alloy thin wall and the elastic supporting structure are combined, the structure is simple, no moving part exists, circulating work in the high-temperature environment and the low-temperature environment can be achieved, local hot spots caused by internal gap movement of the phase change material in the circulating phase change process are reduced, and heat transfer deterioration is avoided.

The invention discloses an alloy die casting ultrasonic flaw detection device which comprises an operation table and an ultrasonic flaw detection host, the ultrasonic flaw detection host is fixed on the operation table, a flaw detection assembly is arranged above the operation table, and the flaw detection assembly comprises a movable frame, a mounting frame, an inclined plate, a detection probe, a ball, a cross rod and a second spring. And a mounting frame is arranged on the front side of the movable frame. According to the ultrasonic flaw detection device for the alloy die casting, in the using process of the device, when a movable frame moves downwards to drive an ejector block to move downwards to make contact with a workpiece, a coating roller makes contact with the workpiece at the moment, and the ejector block is stressed to move relative to a fixed frame and cooperates with the effects of a piston, a cylinder, a one-way air inlet valve, a one-way air outlet valve and a guide pipe; according to the coupling agent coating device, air in the cylinder can enter the coupling agent storage barrel, a coupling agent in the coupling agent storage barrel can be discharged to the coating roller under the action of air pressure, and the coating roller rolls through downward movement of the device, so that the coating effect of the coupling agent can be realized, and detection is facilitated.

An alloy punching apparatus, comprising a main body (1). A bottom end surface of the main body (1) is fixedly connected, symmetrically left and right, to two support plates (101), and each support plate (101) is penetratingly connected, symmetrically front and back, to two support studs (2). An upper end surface of each support plate (101) is provided, symmetrically front and back, with two anti-loosening parts (3). A lower die seat (4) is fixedly mounted in a middle portion of a top end surface of the main body (1), and a punching assembly (5) is mounted above the lower die seat (4). A lubricating mechanism (6) is provided at a bottom portion of the punching assembly (5), and a linking assembly (7) is mounted at a back side of the punching assembly (5). An oil collecting box (8) is mounted at an inner bottom end surface of the main body (1), and a controller (9) is mounted at a front side of an upper portion of a left end surface of the main body (1). By means of cooperation between the linkage assembly and the lubrication mechanism, after a period of use, lubricating oil on an outer surface of a guide slide rod is not lost, and due to a cyclic lubrication effect, the lubrication effect on the outer surface of the guide slide rod is greatly improved, thereby avoiding premature failure of the punching apparatus.

The invention discloses a molybdenum-rhenium alloy pipe fitting defect identification method and system based on a high-definition microscopic image. The method comprises the following operation steps that high-definition microscopic equipment is used for collecting the high-definition image of a molybdenum-rhenium alloy pipe fitting; preprocessing the high-definition image of the molybdenum-rhenium alloy pipe fitting to obtain a molybdenum-rhenium image to be detected; performing execution processing of a region growing algorithm on the molybdenum-rhenium image to be detected to obtain a defect region to be detected; performing defect identification on the to-be-detected defect area to obtain type defects; and judging the defect problem of the molybdenum-rhenium alloy pipe fitting according to the type defect.

The invention discloses a hard alloy cutter welding visual inspection data intelligent management method, and relates to the technical field of welding quality detection, and the method comprises the following steps: obtaining image data in a welding process through a visual inspection system; preprocessing the image data; analyzing defect characteristics of a welding joint area based on an image recognition algorithm, and recognizing a welding quality problem; generating a defect report based on the identified defect features; establishing a welding quality prediction model, and automatically generating a quality evaluation result; and storing the data to the cloud. Through high-resolution image capture and automatic defect analysis based on an image recognition algorithm, defects, such as cracks, air holes and weld irregularity, of a welding joint area can be accurately recognized in real time, the detection precision and efficiency are greatly improved, personal errors are reduced, a welding quality prediction model is established based on a machine learning algorithm, and the welding quality prediction accuracy is improved. Therefore, the quality of the current welding operation is predicted, and the reliability of the detection process is improved.

The invention relates to a production method of a wire rod for an alloy welding wire, and belongs to the technical field of steel manufacturing. Mn, Cr and Ni alloying and V and Ti microalloy strengthening are adopted, and a certain amount of B is added, so that the requirement of a 60-kilogram-level alloy welding wire is met. The process route is designed as follows: molten iron pretreatment, converter smelting, LF furnace external refining, 150mm / 180mm square billet continuous casting, heating furnace heating, rolling, roller way slow cooling and heat preservation vestibule heat preservation. Molten steel with stable components, good castability and gas content meeting the requirement is obtained through the technologies of molten iron pretreatment, converter smelting, LF furnace external refining and the like, after the molten steel is poured into a continuous casting blank, stack cooling or hot delivery and hot charging are conducted for 24 hours, and the technologies of high-temperature rolling, high-temperature spinning, roller way slow cooling and heat preservation vestibule are adopted for high-speed wire rolling. By adopting the process of the scheme, the wire rod can be prevented from generating abnormal structures such as martensite and bainite which influence drawing, and the wire rod for the high-strength alloy welding wire with the specification of phi 5.5 mm, which has stable components and can be drawn into filaments with the specification of phi 1.2 mm without annealing, is obtained.

The invention provides a production method of an invar alloy 4J36 hot-rolled coil, belongs to the technical field of invar alloy 4J36 hot rolling, and solves the problem that the invar alloy 4J36 hot-rolled coil needs to be efficiently produced. The plate blank is preheated and then heated after being ground, and the heated plate blank is subjected to high-pressure water descaling; and the descaled plate blank is rolled into an intermediate blank through seven-pass rough rolling, the intermediate blank is rolled into a black coil through five-pass steckel mill finish rolling, and the black coil is rolled into an invar alloy 4J36 hot-rolled black coil finished product. The method comprises the steps of slab component control, slab preheating and heating, rough rolling to obtain an intermediate slab, steekle mill rolling, coiling and the like, and surface oxidation generated in the heating process is reduced by adjusting the heating process; and through rolling of the steekle mill, dynamic recrystallization is fully carried out, the surface quality of the produced invar alloy 4J36 hot-rolled coil meets the product requirement, and the yield and the production efficiency are both remarkably improved.

The invention discloses a method for preparing a copper-aluminum layered composite board by introducing laser into an intermediate layer, which comprises the following steps: introducing laser into the intermediate layer (Al-Cu-Mg-Si-Zr-Sc series alloy), so that on one hand, copper and aluminum to be compounded are in a heating state to be subjected to rolling compounding by utilizing the heat conduction effect of the heated intermediate layer; the rolling reduction rate and the rolling mill capacity requirement are obviously reduced; and on the other hand, the added middle layer has excellent obdurability, so that the cooperative deformation capacity between the to-be-compounded dissimilar materials can be improved, and the interface bonding performance of the composite material is improved. And a mode of'introducing laser into the middle layer and carrying out short-time online annealing treatment 'is adopted to replace'large down pressure and long-time diffusion annealing' adopted by a traditional copper-aluminum composite material, so that the processing and forming efficiency of the copper / aluminum composite material is remarkably improved, and the method has the characteristic of short process.

The invention discloses a preparation method of a medium-entropy alloy and stainless steel explosive welding composite board, and belongs to the field of metal-based composite material processing. The preparation method specifically comprises the following steps: polishing the medium-entropy alloy and the stainless steel to remove oil stains and oxides on the surfaces of the medium-entropy alloy and the stainless steel; a low-carbon steel anvil serves as a base plate, stainless steel serves as a base plate, a medium-entropy alloy serves as a compound plate, a corrugated board serves as a buffer layer of explosive and the compound plate, and metallurgical connection of the medium-entropy alloy plate and the stainless steel plate is achieved through low-detonation-velocity high-brisance mixed explosive. The interface bonding rate of the obtained composite board is larger than 98.8%, the yield strength is larger than 620 MPa, the tensile strength is larger than 735 MPa, the percentage elongation after fracture is larger than 40%, and the interface shear strength is larger than 300 MPa. The process is simple and convenient, and is suitable for industrial production.

The invention provides a method and system for detecting the content of platinum, palladium and rhodium in an automobile exhaust purification catalyst and application, and relates to the technical field of automobile exhaust purification, the method comprises the following steps: crushing, grinding, sieving, performing microwave acidolysis, neutralizing, washing and drying a catalyst sample to obtain dry filter residues; a trapping agent and a fluxing agent are added into the dry filter residues, constant-temperature heating is conducted in inert gas, then cooling forming is conducted, and an alloy button is obtained; blowing ash on the alloy, then adding mixed acid into the alloy, heating the alloy in a water bath at 95 DEG C for 25-35 minutes to obtain a dissolved solution, then adding a masking agent into the dissolved solution, and oscillating to obtain a solution to be detected; and filtering the liquid to be detected, fixing the volume and detecting. According to the method, precise quantification of trace platinum, palladium and rhodium in the complex matrix catalyst can be realized, and the method has a relatively high recovery rate; meanwhile, pollution elements are prevented from being used, and the method is green and efficient and better conforms to the concept of green chemistry.

The invention relates to the technical field of hard alloy tool bit machining, in particular to a hard alloy tool bit performance detection device which comprises a fixing mechanism, a wear resistance detection mechanism and a bending resistance detection mechanism, the wear resistance detection mechanism and the bending resistance detection mechanism are mounted on the fixing mechanism, and the fixing mechanism comprises a bottom table, a support and a fixing assembly, and the support and the fixing assembly are mounted on the bottom table. The alloy tool bit is primarily clamped and fixed through the clamping part, and when the first hydraulic push rod pushes the connecting disc to move rightwards to conduct friction testing on the alloy tool bit, the pushing rod is used for pushing the clamping part to conduct secondary clamping and fixing on the testing end of the alloy tool bit; and then the pushing rod and the hollow circular ring are connected and locked through the connecting part, and through linkage matching of the hollow circular ring, the clamping part, the pushing rod and the connecting part, the relative stability of the friction block and the alloy tool bit during detection is improved, and then the detection accuracy is improved.

The invention discloses a welding method for heterogeneous multi-wire in-situ metallurgy of a submerged arc pipe of a hydrogen conveying pipeline, and aims to solve the problem of hydrogen-induced failure caused by the problems of coarse weld structure, secondary phase particle aggregation, low-temperature impact toughness and the like caused by a traditional multi-wire submerged arc welding method. The welding method comprises the steps that firstly, the to-be-welded face of the hydrogen conveying pipeline is polished and cleaned; and secondly, the cleaned hydrogen conveying pipeline to be welded is welded through three-wire submerged arc welding, H08MnMoTiB is adopted as a first welding wire, BH60GX-III is adopted as a second welding wire, H08Mn2NiA is adopted as a third welding wire, the components of the three welding wires are optimized, and the technological parameters such as the wire feeding speed, the current and the voltage of the three welding wires are optimized and adjusted. According to the method, the idea of in-situ metallurgy and multi-wire submerged arc welding are fused, the alloy component proportion of transition metal of a welding pool is achieved by changing the wire feeding speed of different welding wires, and different welding process parameters are supplemented, so that quantitative adjustment of the cladding metallurgy performance of a welding seam is achieved, and the hydrogen-induced corrosion resistance is improved.

The invention belongs to the technical field of nickel-based alloy welding wires, and discloses a corrosion-resistant nickel-based alloy welding wire and a production process thereof, and the corrosion-resistant nickel-based alloy welding wire comprises the following components in percentage by mass: 50-65% of nickel, 16-24% of chromium, 8-10% of molybdenum, 3.5-5.5% of niobium and tantalum, 3-4.5% of copper, 3-4% of tungsten, 0.5-1.0% of tin, 0.1-0.3% of rare earth element, 0.1-0.5% of grain boundary optimizer, 2-5% of nano reinforced phase and the balance of Fe and other inevitable impurities. Through multi-element alloying design, nano reinforced phase compounding and gradient coating synergistic effect, comprehensive improvement of corrosion resistance, high-temperature mechanical property and welding manufacturability is achieved; a welding wire base body is based on nickel, a compact and self-repairing gradient oxidation film is formed by accurately regulating and controlling the atomic proportion of chromium, molybdenum and tungsten, and the chloride ion permeation resistance and the high-temperature oxidation resistance are remarkably improved; therefore, the welding wire has excellent corrosion resistance, high-temperature strength and welding adaptability.

The invention discloses a method for applying liquid metal as a thermal interface material, and relates to the technical field of thermal management. The liquid metal with high thermal conductivity is selected as a core heat-conducting medium, the liquid metal shows excellent heat-conducting performance at the normal temperature, the gallium-indium-tin alloy with high thermal conductivity is selected as the core heat-conducting medium, the heat-conducting performance of the thermal interface material is remarkably improved, and the heat-conducting performance of the thermal interface material is greatly improved at the normal temperature. The liquid metal shows excellent heat conduction performance and can form an almost unobstructed heat conduction path, so that heat generated by the electronic equipment is quickly transferred to the radiator, in addition, in combination with the intelligent response material layer, the shape memory polymer is subjected to phase change at a specific temperature, the liquid metal is driven to form a closer contact interface, and the heat dissipation efficiency is improved. The interface thermal resistance is further reduced, and the heat conduction efficiency is remarkably improved.