963 results about "Nickel alloy" patented technology

The invention discloses a laser cladding preparation method for improving the wear resistance of a cladding layer by doping tungsten carbide. According to the method, cladding process parameters are preliminarily obtained based on finite element heat flow analogue simulation, cladding layer preparation is carried out, cladding quality characterization is carried out to obtain the optimal cladding process parameters, and finally the cladding layer with the wear-resistant characteristic is obtained. The method comprises the following steps: firstly, constructing a heat flow coupling three-dimensional model, carrying out grid division, establishing a heat source model, defining thermophysical parameters of tungsten carbide (10-15%) nickel alloy composite powder and a matrix, and determining simulated boundary conditions; setting a multi-factor process parameter combination to carry out numerical simulation calculation, and determining laser processing process parameters of laser power, scanning speed and light spot diameter; preparing a cladding layer on the surface of the nodular cast iron by using tungsten carbide (10-15%) nickel alloy composite powder through a laser cladding method; and carrying out microscopic morphology and microhardness experiments to carry out quality analysis verification on the cladding layer, determining the optimal process parameters of laser power, scanning speed and light spot diameter when the cladding layer has no obvious defect morphology and the hardness is higher than that of the raw material, and obtaining the laser cladding preparation method for improving the wear resistance of the cladding layer by doping tungsten carbide. The invention provides a new research method and a high-quality preparation approach for improving the wear resistance of the cladding layer by tungsten carbide, and can be widely applied to the fields of strengthening and repairing mining machinery, aerospace parts and the like.

The invention relates to the technical field of hydraulic test of nickel alloy pipes, and discloses a hydraulic test system for a thin-wall nickel alloy pipe. According to the system, in the axial loading state of the thin-wall nickel alloy pipe, a closed water pressure cavity is established through an annular sealing clamp, and then strain distribution data on the surface of the pipe body is collected through a distributed optical fiber sensor array. And constructing a three-dimensional stress field reconstruction model based on the acquired strain distribution data, calculating an equivalent plastic deformation threshold value of the pipe body under different water pressure gradients, adjusting a water pressure loading curve slope parameter according to the equivalent plastic deformation threshold value, and generating a dynamic water pressure loading instruction. And the high-frequency pressure pulse generator executes the instruction, synchronously triggers the X-ray diffractometer to collect lattice distortion data of the tube body, inputs the data into the material microscopic damage evolution model, and outputs a microscopic defect spatial distribution map. And finally, material constitutive parameters of the three-dimensional stress field reconstruction model are corrected based on the atlas, closed-loop feedback control is formed, and multi-dimensional data acquisition and accurate management and control of the thin-wall nickel alloy pipe hydrostatic test are achieved.

The invention discloses a special composite enamel coating for a chromium-nickel alloy base material and a preparation method of the special composite enamel coating, when the special composite enamel coating structurally comprises one layer, the special composite enamel coating comprises the following components in parts by mass: 40-65 parts of a basic glass phase, 30-55 parts of a high-melting-point ceramic reinforced phase, 2-10 parts of a thermal expansion coefficient regulator and 0.5-5 parts of an interface bonding accelerant. Compared with the prior art, the enamel coating can achieve nearly perfect thermal expansion coefficient matching with a chromium-nickel alloy matrix, a tough chemical bonding interface is formed, the enamel coating can stably work for a long time in the extreme high-temperature environment of 1,100 DEG C or above, and meanwhile the enamel coating has the excellent abrasion resistance, repeated rapid cooling and rapid heating cycle resistance and thermal shock resistance.

The invention relates to the technical field of iron-nickel alloy foil preparation, and discloses a low-curl iron-nickel alloy foil suitable for an all-solid-state battery and a preparation method of the low-curl iron-nickel alloy foil. The electrolyte solution is added into an electrolytic cell, and current is applied to the electrolyte solution; the method comprises the following steps: depositing an iron-nickel alloy on the surface of a cathode roller, stripping to obtain an iron-nickel alloy foil, carrying out electrophoresis on the iron-nickel alloy foil by using a magnesium oxide electrophoresis solution in an electrophoresis cell to form a magnesium oxide coating on the iron-nickel alloy foil, cleaning with an acid solution, and carrying out electrochemical fluorination treatment on the iron-nickel alloy foil to obtain the magnesium oxide coating on the iron-nickel alloy foil. Forming a fluorinated layer on the magnesium oxide coating; and the iron-nickel alloy foil is subjected to heat treatment at the temperature not exceeding 600 DEG C in a heat treatment chamber, and the iron-nickel alloy foil is obtained after cooling. The high-quality iron-nickel invar iron-nickel alloy foil can solve the curling problem and is suitable for all-solid-state batteries.

The invention provides a copper-nickel alloy foil and a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode current collectors, and the preparation method comprises the following steps: preparing a copper-nickel composite electrolyte, and adding a coordination agent, a pH buffer agent and an additive into the copper-nickel composite electrolyte to obtain a mixed electrolyte; the coordination agent comprises a main coordination agent and an auxiliary coordination agent, and the main coordination agent comprises at least one of trisodium citrate, potassium sodium tartrate and sodium pyrophosphate; the auxiliary coordination agent comprises at least one of ammonia water, glycine and triethanolamine; and a cathode and an anode are placed in the mixed electrolyte, the pH of the mixed electrolyte is controlled to be 6-10, direct current is applied for electrochemical deposition, and the copper-nickel alloy foil is obtained. According to the method, the alkalescence system is adopted, the main coordination agent and the auxiliary coordination agent are used, full coordination of free Cu < 2 + > and Ni < 2 + > is achieved, precipitation is avoided, the hydrogen evolution phenomenon is greatly reduced, and the alloy foil quality is improved.

A firearm suppressor is provided, including a tubular core, a baffle carried within the core, and a tubular mount. The core may be attached end-to-end to the mount. A cap may be attached end-to-end to the core opposite the mount. An intermediate member may be included, extending between the mount and the cap, and residing outboard of the core. The intermediate member may be welded to the mount and to the cap. The mount, the cap, and the intermediate member may be composed of one or more of titanium, aluminum, resins, polymers, composites, carbon fiber, and ceramics, whereas the core and the baffle may be composed of one or more of cobalt, nickel alloy, steel, stainless steel, and cobalt alloy.

The invention discloses a production process of a novel copper-based alloy bimetallic synthesis material, and relates to the field of alloy materials.The production process comprises the steps that a copper-nickel alloy is selected as a base material, a titanium alloy is selected as a functional layer, and stress distribution of a bonding layer is designed and optimized through gradient component distribution; preparing a copper-nickel alloy liquid by utilizing vacuum induction melting, supporting and fixing a core rod through three points, and controlling temperature and flow velocity for pouring to form co-growth crystals; the surface of the base material is cleaned through a sand blasting process, a Cu-Ti nano coating is coated through a PVD technology, and a nanoscale convex-concave structure is formed; building a mathematical model of a temperature field and a component diffusion field, and optimizing and combining area temperature distribution and diffusion behaviors through simulation analysis; through gradient temperature control annealing treatment, residual stress is eliminated, and diffusion is promoted; the bonding performance is evaluated by combining shear strength and microhardness tests; and dividing the production process based on the modular design. The method can be widely applied to the industrial fields with high-temperature, high-strength and corrosion-resistant requirements.

The invention discloses a seawater conductivity sensor electrode material based on a copper-nickel-based nanostructure and a preparation method, the electrode material comprises: a substrate, a copper-nickel-based nanostructure layer being formed on the surface of the substrate; the substrate comprises an insulating compound and a coating coated on the surface of the insulating compound, the insulating compound comprises at least one of high-resistance silicon, silicon oxide, aluminum oxide ceramic and plastic, the coating comprises a metal coating and / or a semiconductor coating, and the copper-nickel-based nanostructure layer is in a dendritic crystal or cluster form. The copper-nickel alloy nanostructure is a core material of the electrode, so that the electrode material has high specific surface area and rich active sites, the measurement accuracy and measurement limit of the electrode material can be improved, the service life can be prolonged, the manufacturing cost can be reduced, and the application requirements of the ocean Internet of Things can be met.

The invention relates to normalized high-strength medium-carbon acid-resistant container steel and a preparation method, and belongs to the technical field of steel manufacturing. The acid-resistant container steel comprises the following chemical components in percentage by mass: less than or equal to 0.20% of C, less than or equal to 0.55% of Si, 1.20-1.70% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, less than or equal to 0.050% of Nb, less than or equal to 0.050% of V, less than or equal to 0.030% of Ti, more than or equal to 0.020% of Al, less than or equal to 0.0060% of Ca and a matrix element Fe. A proper amount of Nb (niobium), V (vanadium) and Ti (titanium) alloy elements are added to replace a traditional Cu (copper) and Ni (nickel) alloy combination, and the alloy component cost is greatly reduced while high strength and acid resistance are guaranteed.

The invention belongs to the field of metal material processing, and particularly relates to a high-strength high-temperature nickel alloy welding material and a preparation method thereof.The high-strength high-temperature nickel alloy welding material comprises, by weight, 0.02%-0.05% of C, 0.10%-0.20% of Si, 18.0%-22.0% of Cr, 7.0%-9.0% of Fe, 4.0%-6.0% of Co, 2.0%-4.0% of W, 3.0%-6.0% of Mo, 0.005%-0.010% of B, 0.5%-2.5% of the total amount of Al and Ti, 0.05%-0.08% of Zr, 2.0%-2.5% of Nb, 0.30%-0.40% of RE, smaller than 0.005% of S, smaller than 0.005% of P, 1.5%-4.0% of modified boron nitride mixed powder and the balance Ni, the high-strength and high-temperature nickel alloy welding material is obtained through hot working, heat treatment, surface treatment and coating preparation, and the problem that in the prior art, deposited metal formed after welding of the high-strength and high-temperature nickel alloy welding material is poor in high-temperature mechanical property in a high-temperature environment can be effectively solved.

The invention discloses an iron-nickel metal magnetic powder core with high stable magnetic conductivity and low loss and a preparation method of the iron-nickel metal magnetic powder core. The iron-nickel metal magnetic powder core is prepared through the steps of preparing iron-nickel alloy powder through gas atomization, screening the particle size, carrying out insulation coating, carrying out compression molding, carrying out heat treatment and carrying out impregnation and spraying. Wherein in the insulating coating process, a passivation solution is adopted to form an insulating layer on the surface of the iron-nickel alloy powder, and the passivation solution comprises 0.1 wt%-0.3 wt% of phosphoric acid, 0.1 wt%-0.6 wt% of sol and the balance deionized water according to the weight part of the iron-nickel alloy powder; and the pH value of the passivation solution is 4-7. According to the technical scheme, the iron-nickel alloy powder is subjected to insulation coating through cooperation of the phosphoric acid, the sol and the coating agent, the magnetic hysteresis loss is effectively reduced, the magnetic conductivity of the iron-nickel magnetic powder core is improved, the quality factor of the iron-nickel magnetic powder core is remarkably improved to 95 or above, and after the obtained high-magnetic-conductivity low-loss iron-nickel magnetic powder core is subjected to long-term high-temperature aging, the magnetic conductivity change rate does not exceed 2%; and the safety and the performance stability are greatly improved in the application of power electronic devices.

The present invention belongs to the fields of electrical and electronic engineering and advanced nonferrous metal additive manufacturing. Specifically, it relates to a method for preparing copper alloy-tungsten-copper composite electrical contacts using laser additive manufacturing. The method uses coaxial powder feeding laser cladding to prepare a nickel or nickel alloy coating as an intermediate layer on a copper alloy substrate. This is followed by laser cladding to prepare a tungsten-copper coating. The composite electrical contact consists, in sequence, of a pure copper or copper alloy substrate layer, a pure nickel or nickel alloy coating, and a tungsten-copper coating. The resulting electrical contact has high electrical and thermal conductivity and good resistance to arc erosion. Using laser cladding technology to prepare copper alloy-tungsten-copper electrical contacts can effectively reduce production costs, improve production efficiency, and facilitate subsequent maintenance and repair, making it environmentally friendly.

The present application relates to high-temperature alloy smelting technical field, specifically relates to a kind of high-aluminum titanium cast nickel-based high-temperature alloy purification smelting method.The pure smelting method, step one, low calcium nickel alloy preparation;Step two, pure smelting: batching and furnace charging, melting period, refining period, alloying period, calcium treatment purification period and casting period;Pure smelting process is carried out in vacuum induction melting furnace, 2 / 3 low calcium nickel alloy is directly loaded into magnesium oxide crucible when furnace charging, and the remaining 1 / 3 low calcium nickel alloy is added in calcium treatment purification period.The present application prepares a kind of component accurately controllable "low calcium nickel alloy" as master alloy by pre-preparation, is added in key smelting stage, solves the problem of calcium element direct addition, realizes the deep deoxidation denitrogenation desulfurization of alloy melt, significantly reduces the oxygen, nitrogen, sulfur impurity content in alloy, to improve the purity and comprehensive mechanical properties of alloy.

The invention belongs to the field of electromagnetic shielding material manufacturing, and particularly relates to a foam nickel alloy blackening process for an electromagnetic shielding material. The foam nickel alloy blackening process for the electromagnetic shielding material comprises the following steps: forming an alloy blackening layer by adopting an alloy electrodeposition blackening step; alloy forming the alloy blackening layer comprises Ni and S, and further comprises one or more of Zn, Sn and Mo. Further, the alloy blackening layer is composed of any one of an alloy Ni-Zn-S, an alloy Ni-Sn-S, an alloy Ni-Mo-S, an alloy Ni-Zn-Sn-S, an alloy Ni-Zn-Mo-S, an alloy Ni-Sn-Mo-S, an alloy Ni-Zn-Mo-S, and an alloy Ni-Sn-Mo-S. Further, the process comprises a pretreatment step, a nickel pre-plating step, an alloy electrodeposition blackening step, a post-treatment step and a drying step. The alloy blackening foamed nickel finished product has excellent conductivity, can improve the absorption capacity of electromagnetic waves, further improves the electromagnetic shielding performance, and has high application value in the field of electromagnetic shielding materials.

Disclosed is a copper foil to which a carrier foil is attached, which has favorable peel strength under high-temperature pressing conditions, the copper foil to which the carrier foil is attached comprising: a carrier foil; a release layer on the carrier foil; a heat-resistant layer on the release layer; and an ultra-thin copper foil on the heat-resistant layer, in which a buffer layer of a nickel alloy is interposed between the release layer and the heat-resistant layer.

The invention provides a conductive paste and a preparation method and application thereof, and the conductive paste comprises 84-91 wt% of a conductive phase, 0.8-5.2 wt% of a glass phase, 4-11 wt% of an organic carrier, 0.1-3 wt% of a dispersant, and the balance of a solvent. The conductive phase comprises 5-60 wt% of nickel alloy powder and 40-95 wt% of silver powder, the nickel alloy powder comprises at least one nickel alloy compound, the nickel alloy compound has a general formula of Ni-alpha-beta-gamma, alpha, beta and gamma are three non-nickel elements which are different from one another, and the sum of the alpha, the beta and the gamma is 100%. The elements alpha, beta and gamma are respectively selected from any one of transition metal, rare earth metal, alkaline earth metal and other non-nickel elements, the mass content of the nickel element is 10-99 wt%, and the sum of the mass content of the elements alpha, beta and gamma is 1-90 wt%. Nickel elements and non-nickel elements alpha, beta and gamma in a proper mass ratio are screened to form nickel alloy powder, so that the physical and chemical properties of the nickel alloy powder are improved, the ratio of the nickel alloy powder for replacing silver powder is increased, the electrical properties in the conductive slurry can be guaranteed, and the cost of the slurry is remarkably reduced.

The invention provides a production process of a high-low tooth screw, relates to the technical field of screw production, and solves the problems of poor skid resistance, low fastening efficiency, unbalanced mechanical properties, insufficient corrosion resistance and the like of a traditional screw through innovative design and process optimization. SCM435 alloy steel is selected, spaced anti-skid teeth are pressed within the range of 270 degrees in the circumferential direction of the head of the screw through a four-station cold header, high-low alternating tooth forms are twisted on the rod portion, the gradient hardness of the surface and the core portion is achieved through isothermal quenching, surface treatment is combined with zinc-nickel alloy electroplating and a polytetrafluoroethylene coating, and the corrosion resistance and the assembly smoothness are improved; full-process intelligent detection is realized through machine vision, three-coordinate measurement and torsion test. The local layout of the anti-skid teeth reduces material consumption and improves meshing efficiency, the high-low tooth form reduces assembly torque and stabilizes pre-tightening force, gradient heat treatment enhances fatigue resistance, the composite coating improves corrosion resistance, and intelligent detection guarantees product consistency.

The invention is suitable for the technical field of water electrolysis hydrogen production, and provides an alkyne-rich carbon-ruthenium nickel alloy catalyst and a preparation method and application thereof. The preparation method comprises the following steps: simultaneously adding a ruthenium salt solution, a nickel salt solution and an organic molecule solution into an alkyne-enriched carbon dispersion liquid for reaction; and carrying out centrifugation, cleaning and vacuum drying treatment on the reacted mixed solution to obtain the alkyne-rich carbon-ruthenium nickel alloy catalyst. According to the invention, the acetylene-rich carbon-ruthenium nickel alloy catalyst uniformly loaded with ruthenium nickel (RuNi) clusters is successfully prepared. In the performance evaluation of hydrogen production by water electrolysis in a simulated seawater environment, the material shows excellent hydrogen evolution activity as a cathode catalyst. Experimental results show that under the applied potential of-0.6 V (relative to a reversible hydrogen electrode, RHE), the absolute value of the current density can reach 0.847 A cm <-2 > to 0.896 A cm <-2 >. The invention provides a feasible material solution for developing a high-performance water electrolysis hydrogen production catalyst suitable for a complex water quality environment.

The invention discloses a hydrogen storage alloy and a preparation method thereof, relates to the technical field of metal functional materials, and solves the problems of high reaction temperature and low hydrogen absorption and dehydrogenation rate of a magnesium-based hydrogen storage material in the prior art. The prepared hydrogen storage alloy comprises the following alloy components in parts by mass: 5-15 parts of nickel, 2-8 parts of yttrium, 2-8 parts of ytterbium, 68.8-91 parts of magnesium and 0-0.2 part of impurities. A magnesium ingot, a magnesium-yttrium alloy and a magnesium-ytterbium alloy are melted, then magnesium-nickel alloy is added, stirring is conducted till the magnesium-nickel alloy is melted, standing is conducted, and casting is conducted to obtain a hydrogen storage magnesium alloy cast ingot; the method comprises the following steps: crushing a hydrogen storage magnesium alloy cast ingot, loading into a stainless steel ball milling tank for dry milling, and adding a solvent into the tank body for wet milling after the dry milling is finished; and drying to obtain the magnesium alloy flaky powder. According to the invention, multiphase cooperation, structure regulation and interface optimization of multiple elements are utilized, so that the hydrogen absorption and desorption performance of the hydrogen storage material is obviously enhanced.

The invention relates to the technical field of metallurgy preparation of heterogeneous materials, in particular to an efficient laser cladding preparation method of nickel-based superalloy on the surface of copper alloy, which comprises the following steps: increasing the absorptivity of the copper alloy to infrared laser through preheating, and carrying out laser cladding on GH3625 alloy on the surface of Cu-Cr-Zr alloy through regulating and controlling the components of a copper alloy / nickel alloy intermediate layer, so as to prepare the nickel-based superalloy on the surface of Cu-Cr-Zr alloy. And formation of a microstructure in the non-equilibrium solidification process is controlled, the process is optimized, and the mechanical property of the material is improved. According to the method, the intermediate layer is utilized to perform non-equilibrium state metallurgy preparation of the GH3625 alloy on the surface of the Cu-Cr-Zr base material, compared with the method without adding the intermediate layer, after the intermediate layer is added, the content of the copper element in a molten pool is increased, liquid-phase separation is promoted, a large-range Ni-Cr core shell is formed to serve as a low-energy nucleation site, crystal grains are refined, and the performance of the Cu-Cr-Zr alloy is improved. Further, a fine grain strengthening effect is achieved; the thickness of the element diffusion layer is also increased by adding the middle layer, the element uniformity is promoted, the dependence on Malangori is reduced, the heat input is reduced, the optimization of process parameters is realized, and the mechanical property of the heterogeneous material is further improved.

The invention belongs to the field of metal material processing, and particularly relates to a multi-element nickel alloy composite welding wire with low thermal crack sensitivity and a preparation method of the multi-element nickel alloy composite welding wire with the low thermal crack sensitivity. The welding wire comprises the following powder raw materials in parts by weight: 0.01 to 0.05 percent of C, 0.10 to 0.20 percent of Si, 28.5 to 30.5 percent of Cr, 7.0 to 11.0 percent of Fe, less than or equal to 1.0 percent of Mn, 1.0 to 2.0 percent of Co, 4.0 to 5.0 percent of Mo, 0.001 to 0.005 percent of B, 0.1 to 0.2 percent of Al + Ti, 0.005 to 0.020 percent of Zr, 1.0 to 2.0 percent of Nb, 0.1 to 0.4 percent of Ta, 0.5 to 1.0 percent of Sn, 0.20 to 0.30 percent of RE, less than 0.005 percent of S, less than 0.005 percent of P and the balance of Ni. And the plating layer comprises a titanium carbide layer and a nickel layer from inside to outside. A welding wire raw material is subjected to smelting, high and low temperature refining, annealing, forging and rolling, multi-pass drawing-annealing, solid solution-aging treatment and acid pickling, coating and plating to obtain the nickel-based alloy welding wire, and the problems that in the prior art, when a nickel-based alloy welding material is used for welding, cracks are prone to being generated, and the strength is low due to hot corrosion can be effectively solved.

The invention relates to the technical field of nickel alloy pipe water pressure detection, and discloses a thin-wall nickel alloy pipe inner wall water pressure test detection system and method. The method comprises the steps that a closed water pressure environment is established in a pipe, a preset pressure gradient is applied, and pipe wall deformation response data are collected through a distributed sensing array; and generating a composite feature matrix containing axial strain, circumferential stress and radial displacement features through multi-dimensional feature extraction, inputting the composite feature matrix into a material performance degradation evaluation model, and simulating microstructure change to output a potential defect distribution map. Dynamically adjusting the water pressure gradient and the pressure maintaining time according to the map, executing a secondary water pressure test, and capturing a microscopic deformation sequence image through high-frequency imaging; comparing the image with a model prediction result identification deviation value, and iteratively updating a model parameter to optimize a detection threshold value; the test is completed by optimizing the threshold value, qualified pipe section marks and defective pipe section positioning coordinates are output, and the comprehensiveness and accuracy of thin-wall nickel alloy pipe inner wall defect detection are improved.

To provide a high Ni alloy containing Nb and N that has superior high-temperature creep strength.SOLUTION: A high Ni alloy having superior high-temperature creep strength, the alloy comprising, in mass%, C: 0.08% or less, Cr: 20-30%, Ni: 23-60%, Al: 0.01-0.20%, Ti: 0.05% or less, B: 0.0002-0.0050%, N: 0.10-0.30%, O: 0.006% or less, Ca: 0.0001-0.0050%, at least one of Mo and W in an amount of Mo+0.5×W: 0.01-1.50% (less than 1.50%), Nb: 0.10-0.65%, and at least one of V and Ta in a total amount of 0.01-0.60%, and satisfying the following [Limiting Expression A], and characterized in that the total amount (Nb) of Nb precipitated in the steel material is 0.11 mass% or less. [Limiting Expression A] 0.65≤Nb%+2×V%+Ta%≤1.60.SELECTED DRAWING: Figure 1

Valves with a coated surface are described. A surface of the valve can include a surface coating. For example, the surface coating can include many different materials and may include a metal or metal alloy such as, for example, a molybdenum alloy or a nickel alloy or a nickel molybdenum alloy. Systems and devices including the valves are also described.

The invention provides an alternating-current weak current high-precision detection system and method, and the system comprises a copper-nickel alloy shielding cover which is used for inhibiting space power frequency radiation interference and power system broadband noise, and a magnetic sensitive element which is used for converting the detected magnetic field change into a corresponding initial current signal, the trans-impedance amplifier is used for converting the initial current signal into a voltage signal; the adaptive noise suppression module collects a power frequency fundamental wave reference signal and a harmonic wave reference signal, generates a harmonic wave anti-phase counteracting signal, and performs anti-phase counteracting on real noise of the initial current signal; the analog-to-digital converter is used for converting the voltage signal into a discretized digital signal, and the discretized digital signal comprises a target signal and a random noise signal; and the FPGA coherent demodulation module is used for carrying out cross-correlation operation and narrow-band filtering on the target signal and the random noise signal to separate out a micro-current signal. The technical problems that in the prior art, composite noise covering is limited, the frequency fluctuation adaptability is poor, and microvolt-level signals are difficult to capture are solved.

The invention discloses a gradient copper-nickel alloy and a preparation method thereof, and belongs to the technical field of alloy preparation. CuCrZr is laid on the substrate, laser printing is carried out, and a CuCrZr alloy layer is formed on the surface of the substrate; gradient powder feeding printing is carried out on the CuCrZr alloy layer, and circulation is carried out for multiple times; the conveyed powder comprises CuCrZr and GH4169, the content of the CuCrZr is reduced along with the number of times of gradient powder feeding printing, and during last gradient powder feeding printing, only GH4169 is conveyed, printing is conducted, and the gradient copper-nickel alloy is obtained. Through the composition gradient design from CuCrZr to GH4169 and the multi-cycle printing process, collaborative improvement of high strength and high plasticity is achieved, and the product of high strength and ductility is obtained. According to the method, a single component can realize structure-function integration from high thermal conductivity and electrical conductivity to excellent high-temperature strength and corrosion resistance, and the application potential of a material system in different fields is greatly expanded.

The invention relates to a production method of high-grade non-oriented silicon steel hot-rolled strip steel, and belongs to the technical field of steel preparation. The method comprises the following steps: carrying out heating treatment on a non-oriented silicon steel continuous casting sheet billet containing specific alloy components, and controlling the tapping temperature of the heating treatment to be a set tapping temperature; carrying out rough rolling on the heated non-oriented silicon steel continuous casting sheet billet to obtain an intermediate billet; the intermediate billet is subjected to finish rolling, and hot-rolled strip steel is obtained; and the hot-rolled strip steel is subjected to laminar cooling, coiling, heat preservation and edge cutting, and the high-grade non-oriented silicon steel hot-rolled strip steel is obtained. Key process parameters of each hot rolling process are accurately controlled, and batch stable production of the high-grade non-oriented silicon steel with high silicon and high nickel alloy components is realized. According to the method, the edge qualification rate and the yield are increased, the harsh requirements of users for the material performance, the size and the strength are met, and key material support is provided for strategic emerging industries such as new energy automobiles and unmanned aerial vehicles.

The multi-measuring-point armored alloy thermocouple comprises a thermode, a metal armored layer arranged outside the thermode in a sleeving mode and an insulating material filled between the thermode and the metal armored layer, a plurality of metal wires of the thermode are made of copper-nickel alloy materials and are arranged in order, one ends of the metal wires are welded to form a measuring end, and the other ends of the metal wires are welded to form a welding end. The metal armor layer adopts a layered structure design and is composed of an innermost layer, a middle layer and an outermost layer; the metal armoring layer adopts a spiral winding armoring structure design, and an armoring material is wound around the thermocouple wire in a spiral mode. According to the invention, research is carried out from the aspects of structure, process method, dynamic characteristics, numerical simulation, alloy material components and the like, and analysis and inspection are carried out in combination with the means of theoretical analysis, experimental test and the like, so that the use of precious thermocouple materials is effectively reduced; and finally, the comprehensive performances such as the bending quality, the dynamic response time, the measurement precision, the stability and the manufacturing cost of the armored cable are improved.

The invention discloses an FPC film strain gauge and a manufacturing method thereof. The strain gauge comprises a flexible insulating substrate, a specific-component copper-nickel alloy layer (with 55% of Cu and 45% of Ni and the thickness of 1-5m) sputtered on the flexible insulating substrate, a plurality of independent sensitive grids etched on the alloy layer and arranged along different directions, and a signal lead on the other surface of the substrate, wherein the flexible insulating substrate is connected with the specific-component copper-nickel alloy layer through a via hole with a metalized hole wall. The manufacturing method comprises the steps of drilling, three-step plasma treatment, magnetron sputtering of alloy, electroplating of copper to reinforce the hole wall, double-sided photoetching and etching and the like. Through glue-free sputtering combination and a specific alloy formula, the problems of glue layer aging and temperature drift of a traditional strain gauge are solved, and the product has the advantages of being ultrathin, flexible, high in stability, high in precision and suitable for batch production.

The invention belongs to the technical field of soft magnetic materials, and particularly relates to a preparation method of a low-loss high-direct-current superposition iron-silicon / iron-nickel composite magnetic powder core. The large-particle iron-silicon alloy powder and the small-particle iron-nickel alloy powder are mixed, the large deformation degree of the iron-nickel particles can be prevented, meanwhile, the direct-current superposition characteristic of the magnetic powder core is improved, and power loss is reduced. And the magnetic powder is preheated in N2 or H2 atmosphere, so that the grains grow up, the grain boundary is reduced, and the hysteresis loss of the magnetic powder core is effectively reduced. The magnetic powder is coated with the aluminum-magnesium silicate, the coating effect can be improved, the dispersion effect of the coated magnetic powder is good, the redundant coating agent serves as filler, and the completeness of a coating layer during forming is guaranteed. And the magnetic powder core blank is annealed in the H2 atmosphere, so that the blank is prevented from being oxidized, and the power loss of the magnetic powder core is reduced. The prepared low-loss iron-silicon magnetic powder core has excellent soft magnetic performance and low power loss, and meets the requirements of electronic components for soft magnetic material performance.