1392 results about "Nickel" patented technology

The invention relates to the technical field of alloys, in particular to a weldable high-temperature corrosion-resistant nickel-based alloy and a preparation process thereof. The nickel-based alloy comprises Cr, Mo, W, Ti, Al, Nb, Co, B, Zr, La, C, Si, Mn, P, S and the balance Ni and inevitable impurities. The element content meets the following conditions: Al + 0.5 Ti + 0.3 Nb is greater than or equal to 3.35 wt.% and less than or equal to 3.8 wt.%, the volume fraction of the gamma'phase is correspondingly 28-34%, and the electron vacancy number Nv is less than 2.6. According to the preparation process, VIM and PESR duplex smelting, multi-pass forging, solid solution rapid cooling and aging heat treatment are adopted, and the welding process is optimized in a matched mode. The alloy has excellent welding performance while maintaining excellent high-temperature strength and corrosion resistance, and is particularly suitable for high-temperature parts needing to be welded in the fields of aerospace, energy, chemical industry and the like.

The invention relates to the technical field of electro-catalysis oxygen evolution, and particularly discloses a nickel-molybdenum foam composite oxygen evolution electro-catalysis material with high-valence nickel induced by molybdate radicals and a preparation method of the nickel-molybdenum foam composite oxygen evolution electro-catalysis material aiming at the problem that an existing oxygen evolution electro-catalysis material is insufficient in comprehensive performance or poor in performance stability. Soaking in a NaCl aqueous solution, and taking out; s2, mixing the nickel-molybdenum alloy foam with a K3 [Fe (CN) 6] aqueous solution, heating, and carrying out a hydrothermal reaction; and S3, finally, the nickel-molybdenum alloy foam is placed in the air or oxygen atmosphere and heated to 350-450 DEG C, heat preservation treatment is conducted for 2 h, and the nickel-molybdenum foam composite oxygen evolution electro-catalysis material is obtained. Molybdate anions are adopted as a sustainable induction source to be coupled with a NixOy / Fe3O4 heterogeneous interface, integrated construction is achieved on a nickel-molybdenum foam framework, and the nickel-molybdenum foam composite material has the advantages of being low in overpotential, high in stability, high in activity, high in binding force and long-term in durability and meanwhile being simple in process, easy to amplify on a large scale and the like.

The invention relates to a nickel-molybdenum anode electrode based on a crack induced self-passivation mechanism and a preparation method of the nickel-molybdenum anode electrode. The method comprises the following steps that 1, a substrate is soaked in a solution A for 1-25 min and then taken out; 2, immersing the substrate treated in the step 1 into a solution B for 10 minutes to obtain a precursor; and 3, putting the precursor into a Joule ultrafast heating device, heating the precursor to 380-450 DEG C at a heating rate greater than or equal to 100 DEG C / min in an air or inert atmosphere, carrying out heat preservation for a certain time, and cooling to obtain the nickel-molybdenum anode electrode. According to the method, the foam nickel three-dimensional framework is free of structural damage through short-time chemical soaking, the original high porosity and interconnection network of the foam nickel three-dimensional framework are perfectly reserved, and the loss rate of the specific surface area is reduced. According to the prepared nickel-molybdenum anode electrode, by means of the self-passivation effect of the crack edge and the component storage function of the thick layer, the Mo dissolution rate is reduced by one order of magnitude, and thousand-hour-level stable operation under the low current density can be achieved.

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention provides a nickel-based rare earth composite powder material for high-speed laser cladding and a preparation method of a nickel-based rare earth composite coating, and relates to the technical field of laser cladding and metal surface modification. The nickel-based rare earth composite coating takes Inconel 625 nickel-based alloy as a matrix phase material; a trace amount of rare earth oxide Y2O3 is introduced into a powder system to serve as a second phase enhancing component, and the material is prepared and formed at a time under the condition of a high-speed laser cladding process; in the high-speed laser cladding process, due to high scanning speed, low heat input per unit length and high cooling rate, metal liquid in a molten pool has the characteristic of rapid solidification; the rare earth oxide Y2O3 can stably exist in a molten pool, the particle surface of the rare earth oxide Y2O3 provides a large number of heterogeneous nucleation cores for the alloy solidification process, meanwhile, grain growth is restrained through the grain boundary pinning effect, and therefore the solidification structure form of the nickel-based cladding coating is remarkably improved.

The application provides a nickel-based cast high-temperature alloy and a preparation method thereof, wherein the chemical composition of the nickel-based cast high-temperature alloy is as follows: 0.12wt%-0.15wt% of C, 18.5wt%-21.5wt% of Cr, 10wt%-18wt% of Co, 2.5wt%-4.5wt% of W, 1.5wt%-3.0wt% of Mo, 1.5wt%-3.0wt% of Al, 3.2wt%-4.0wt% of Ti, 1.3wt%-2.5wt% of Nb, 0.010wt%-0.013wt% of B, Zr≤0.1wt%, and the balance of Ni. The nickel-based cast high-temperature alloy has good mechanical properties, microstructure stability and process performance, and can be used for preparing large thin-walled complex structure hot end structural parts.

The invention discloses a high-specific-gravity and high-toughness tungsten-nickel-copper material and a preparation method thereof, and belongs to the technical field of non-ferrous metal materials. The material comprises the following components in percentage by mass: 6-15% of nickel; 2-5% of copper; 2-5% of manganese, and the balance tungsten and inevitable impurities. The preparation method of the material comprises the following steps: preparing materials (pure tungsten powder, pure nickel powder, pure copper powder and pure manganese powder), mixing the powder, pressing, sintering, and carrying out recrystallization annealing heat treatment. In the burdening step, two kinds of tungsten powder with different particle size grades are selected and added, and the gradient particle size ratio is adjusted. By adding the strengthening element manganese, combining the gradient particle size ratio and enhancing interface bonding, the high specific gravity and high strength of the material are kept, meanwhile, excellent toughness can be kept, and the material is suitable for aerospace gyroscope rotors and balance weight parts, electronic industry precise instrument parts, medical instrument ray shielding materials and national defense military industry kinetic energy armor-piercing weapon parts.

The invention provides a zinc-copper-nickel-copper smelting deslagging agent and a preparation method and a use method thereof. The zinc-copper-nickel-copper smelting deslagging agent comprises the following raw materials in percentage by mass: 5-15% of calcium fluoride, 20-30% of sodium carbonate, 5-15% of sodium fluoride, 10-20% of sodium hexafluoroaluminate and the balance of borax. Compared with the prior art, the zinc-copper-nickel-copper slag remover prepared by mixing the raw materials can effectively reduce impurities to be less than 0.14% of Fe, less than 0.005% of Pb and less than 0.003% of Si in the smelting process, the impurity components are obviously reduced, the number of times of component adjustment and unqualified sampling is reduced, impurities mixed in a casting blank are reduced, and finally the metal purity and the casting quality are improved. Meanwhile, loss of zinc and nickel is reduced to the maximum extent; and adverse effects on the zinc-copper-nickel alloy are avoided.

The invention discloses a method for improving the oxidation resistance of nickel-based superalloy, and belongs to the technical field of metal material surface modification. Based on the high-energy transient effect of laser shock waves, the method mainly comprises the key steps of alloy surface pretreatment, laser shock peening process implementation, post-treatment and the like. Specifically, firstly, the surface of the nickel-based single crystal alloy is subjected to pretreatment such as polishing and cleaning, surface defects and pollutants are removed, and the treatment quality is guaranteed; then, according to the material characteristics and performance requirements of the nickel-based single crystal alloy, laser parameters such as laser energy, pulse width and light spot diameter are accurately set, and proper restraint layer and absorption layer materials are selected; then, high-energy pulse laser is utilized to irradiate the absorption layer, high-temperature and high-pressure plasma is induced to be generated, the plasma expands and explodes to generate strong shock waves, the shock waves act on the alloy surface, the surface material is subjected to severe plastic deformation, a residual compressive stress layer with the depth capable of reaching hundreds of micrometers is formed, meanwhile, surface grains are refined, and the microstructure is optimized; and after the strengthening treatment is completed, simple cleaning and performance detection post-treatment are carried out. Through laser shock strengthening, a special organization structure with high density and low defect density is formed on the surface of the nickel-based single crystal alloy, diffusion and invasion of oxygen atoms are effectively hindered, and the oxidation resistance of the alloy is remarkably improved. According to the method, the controllability of technological parameters is high, the strengthening effect can be accurately regulated and controlled, the treatment process is free of pollution and high in efficiency, the obtained strengthened nickel-based single crystal alloy can be widely applied to the fields such as aerospace engine hot end parts and nuclear energy equipment which have strict requirements for high-temperature oxidation resistance, the reliability of related parts is greatly improved, and the service life of the related parts is greatly prolonged.

The invention discloses a preparation method of high-toughness nickel-based alloy composite powder for additive manufacturing. The method comprises the steps that nickel-based alloy matrix powder and nanometer reinforced particles are fed into a forming cavity, under the inert atmosphere and cooling conditions, a spiral blade is driven to rotate at the high speed of 15000-30000 rpm, meanwhile, the pressure in the cavity is maintained to be 2-8 MPa, and treatment is conducted for 30-120 minutes; and through the synergistic effect of kinetic energy and high-speed airflow, combination of size selective milling and cold welding is achieved, and the core-shell structure composite powder with matrix powder evenly coated with nano-reinforced particles is prepared. According to the preparation method, ball-milling-medium-free design is adopted, powder pollution and sphericity deterioration are avoided, and the prepared composite powder has high sphericity and fluidity, is suitable for the laser additive manufacturing process and can effectively refine grains, inhibit element segregation, cooperatively improve the strength and toughness of components and solve the problem of high-plasticity inversion.

The invention provides a ternary positive electrode precursor material and a preparation method and application thereof. The ternary positive electrode precursor material sequentially comprises a nickel-cobalt-manganese core, a nickel-cobalt-manganese transition layer and a nickel-cobalt-manganese shell from inside to outside, wherein the surface of the nickel-cobalt-manganese core is coated with the nickel-cobalt-manganese transition layer, and the surface of the nickel-cobalt-manganese transition layer is coated with the nickel-cobalt-manganese shell; wherein the nickel-cobalt-manganese core is also doped with a boron element; the molar content of nickel in the surface, close to the nickel-cobalt-manganese core, of the nickel-cobalt-manganese transition layer is smaller than the molar content of nickel in the nickel-cobalt-manganese core, the molar content of nickel in the nickel-cobalt-manganese transition layer is gradually reduced from inside to outside, and the molar content of nickel in the surface, close to the nickel-cobalt-manganese shell, of the nickel-cobalt-manganese transition layer is larger than or equal to the molar content of nickel in the nickel-cobalt-manganese shell; and the molar content of manganese in the nickel-cobalt-manganese shell is the highest. According to the precursor material, the lithium-nickel mixing phenomenon is inhibited, stress cracking easily caused by sudden change of components between the core and the shell from the core to the shell is relieved, the effect of inhibiting the side reaction of an electrolyte is also achieved, and the cycling stability and safety of the battery are improved.

The invention discloses a nickel-cobalt-selenium (Co1-xNixSe2) nano material for electrocatalytic oxidation of ethylene glycol as well as a preparation method and application of the nickel-cobalt-selenium (Co1-xNixSe2) nano material. The material is prepared by a hydrothermal method which comprises the following steps: (1) pouring 20mL of deionized water containing 475.9 mg of CoCl2. 6H2O into a 1mol / L NaOH solution containing 0.32 g of selenium powder to prepare a precursor solution; (2) placing in a stainless steel autoclave with a polytetrafluoroethylene lining, carrying out hydrothermal reaction at 180 DEG C for 18 hours, washing with absolute ethyl alcohol and deionized water, and carrying out vacuum drying at 60 DEG C to obtain a CoSe2 material; and (3) the molar feeding ratio of CoCl2. 6H2O to NiCl2. 6H2O is adjusted, so that the nickel / cobalt ratio x is 0.25, 0.50 or 0.75, and materials with different components, namely Co < 0.75 > Ni < 0.25 > Se < 2 >, Co < 0.50 > Ni < 0.50 > Se < 2 > and Co < 0.25 > Ni < 0.75 > Se < 2 >, are prepared. The series of materials are applied to ethylene glycol oxidation under the alkaline condition, the catalytic performance of Co < 0.50 > Ni < 0.50 > Se < 2 > is optimal, the current density reaches 111 mA cm <-2 > under the electric potential of 1.6 V vs.RHE, the total Faraday efficiency reaches up to 91.4%, and the application prospect in the field of PET plastic recovery is wide.

The invention discloses a manufacturing process of an NO7718 nickel base alloy nut for nuclear equipment. The manufacturing process comprises the steps of material preparation, hot forging, shot blasting, solid solution heat treatment, physical and chemical detection, finish machining, precipitation hardening heat treatment and detection packaging. The hot forging near-net forming technology is adopted, the shape of the nut blank is directly obtained through plastic deformation, the cutting allowance of machining is greatly reduced, a large number of raw materials are prevented from becoming sweeps, the material utilization rate is remarkably increased, and the raw material cost is effectively reduced; by accurately controlling the initial forging temperature, the final forging temperature and the cooling speed of hot forging as well as subsequent solution treatment and precipitation hardening treatment, grains can be refined, and the precipitation form and distribution of a strengthening phase can be controlled, so that the microstructure of the material is optimized, and the material obtains more excellent comprehensive mechanical properties such as higher strength, plasticity and toughness cooperation; and the harsh working condition requirements of nuclear equipment can be better met. The process provided by the invention ensures the stability and consistency of product performance.

The invention provides a nickel metal hydroisomerization catalyst as well as a preparation method and application thereof. The catalyst comprises nickel, an alumina carrier and a molecular sieve, the nickel is loaded on the alumina carrier, and the content of the nickel in the catalyst is 1-10wt%; the molecular sieve is an SAPO molecular sieve. According to the invention, alumina is used as a carrier, non-noble metal nickel is loaded through a wet immersion method and is mixed with the molecular sieve to prepare the alkane isomerization catalyst, so that active metal with smaller particle size and higher dispersity can be provided, metal agglomeration at high temperature is avoided, and the utilization rate of metal is increased; the catalyst with excellent catalytic activity can be obtained only by loading low-content nickel metal, the catalyst has higher catalytic activity and selectivity, the obtained product contains more isomers, and the low-temperature fluidity of the product can be remarkably improved.

The invention relates to the technical field of gas analysis, in particular to a determination method for detecting impurity elements in chlorine-nitrogen mixed gas by an ICP-MS (Inductively Coupled Plasma Mass Spectrometry) method. The invention establishes an analysis method for determining the contents of eight elements including iron (Fe), chromium (Cr), copper (Cu), zinc (Zn), nickel (Ni), sodium (Na), cadmium (Cd) and phosphorus (P) in chlorine-nitrogen mixed gas by an ICP-MS (Inductively Coupled Plasma Mass Spectrometry) method. By optimizing ICP-MS analysis conditions and a sample pretreatment process and adopting an electronic-grade solvent to leach elements, rapid and accurate detection and high reproducibility of the impurity content in the chlorine-nitrogen mixed gas are realized. The method can be applied to quality control and analysis in the production process of a chlorine-nitrogen mixed gas product, and lays a foundation for establishing a standard of a chlorine-nitrogen mixed gas analysis method.

The invention provides a treatment method for synergistically enhancing the comprehensive performance of a neodymium-iron-boron magnet, and belongs to the technical field of magnetic materials. According to the method, a heavy rare earth layer and a corrosion-resistant metal layer such as copper, nickel and cobalt for promoting grain boundary diffusion of heavy rare earth are respectively deposited on the surface of the neodymium-iron-boron magnet by adopting a multi-layer electroplating method, the coercivity of the neodymium-iron-boron magnet is enhanced through grain boundary diffusion, and the corrosion resistance of the magnet is enhanced through a nickel-cobalt coating. The treatment method comprises the following steps: carrying out electrochemical deposition on the neodymium-iron-boron magnet in a heavy rare earth metal plating solution, and then respectively electroplating a copper plating layer and a nickel-cobalt plating layer to obtain a heavy rare earth-containing plating layer with strong corrosion resistance and good plating film binding force; the neodymium-iron-boron magnet containing the heavy rare earth coating is subjected to heat treatment, and the coercive force of the magnet is improved through heavy rare earth grain boundary diffusion. The neodymium iron boron grain boundary diffusion process and the surface corrosion prevention process are subjected to integrated treatment, the technological process of high-performance neodymium iron boron industrial preparation is shortened, and the coercive force and the corrosion resistance of the magnet are comprehensively enhanced.

The invention provides a nickel ore target region prediction method and system based on hyperspectral remote sensing data analysis, and relates to the technical field of mineral resource exploration, and the method comprises the steps: firstly obtaining a hyperspectral remote sensing data body of a to-be-predicted region, then carrying out alteration feature space clustering construction processing on the hyperspectral remote sensing data body, forming an alteration feature space cluster body, and carrying out the clustering construction processing on the alteration feature space cluster body; the method comprises the following steps: identifying spatial distribution of various geological alteration types and binding spectral features, then carrying out mineralization alteration combination sequential spatial evolution processing to obtain a mineralization alteration sequential evolution body, then carrying out target area indication feature anchoring shaping construction processing on the mineralization alteration sequential evolution body to form a target area indication space shaping body, and carrying out target area indication feature anchoring shaping construction processing on the target area indication space shaping body. And positioning key indication characteristics of the nickel ore target region, and finally carrying out nickel ore target region space consolidation delineation treatment to generate a nickel ore target region prediction result. According to the method, spectrum and space information of hyperspectral remote sensing data is fully utilized, and the accuracy and reliability of nickel ore target region prediction are effectively improved.

The invention discloses high-performance bridge steel and a production method thereof, and belongs to the technical field of ferrous metallurgy. The bridge steel comprises the following chemical components in percentage by mass: 0.09%-0.11% of carbon; silicon: less than or equal to 0.55%; 1.4%-1.6% of manganese; less than or equal to 0.018% of phosphorus; sulfur: < = 0.005%; 0.15% to 0.20% of niobium; less than or equal to 0.08% of vanadium; 0.006% to 0.03% of titanium; 0.01 to 0.02 percent of chromium; 0.01% or less of nickel; less than or equal to 0.3% of copper; 0.01% to 0.045% of aluminum; less than or equal to 0.3% of molybdenum; not more than 0.008% of nitrogen; and the balance of iron and inevitable impurities. According to the high-performance bridge steel and the production method thereof, by optimizing the component design and the production process, production of the bridge steel with high strength, low yield ratio, high toughness and good welding performance can be achieved.

The invention relates to an additive manufacturing and residual stress measuring method for a nickel-based high-temperature alloy component. The additive manufacturing and residual stress measuring method comprises the following steps that 1, the nickel-based high-temperature alloy component is prepared on a substrate through a selective laser melting technology; 2, the formed nickel-based high-temperature alloy component is separated from the base plate, and stress relief annealing heat treatment is conducted on the nickel-based high-temperature alloy component; the destressing annealing heat treatment comprises the following steps: preserving heat at 550-950 DEG C for 2 hours, and then air-cooling to room temperature; and 3, measuring the residual stress of the nickel-based high-temperature alloy component subjected to stress annealing heat treatment by a contour method. The residual stress of the component is greatly reduced through heat treatment, and cracking and deformation of the component caused by the internal residual stress of the component are avoided.

The invention provides a method for inhibiting cracks of an additive manufacturing nickel-based superalloy and application of the method. The method comprises the steps that a selective laser melting technology is adopted, nickel-based alloy powder is subjected to 3D printing, so that the nickel-based alloy powder is formed layer by layer, and a printing component is obtained; wherein during printing, interlayer rotation is carried out, and after printing of each layer is completed, the layer is subjected to same-path instant remelting with the same laser scanning path and the same 3D printing process condition; the printing component is subjected to sectional type heat treatment, the sectional type heat treatment comprises a first stage, a second stage and a third stage, the heat treatment temperature of the first stage is 650-850 DEG C, the heat treatment temperature of the second stage is 950-1200 DEG C, and the heat treatment temperature of the third stage is 650-850 DEG C, so that the nickel-based superalloy is obtained. According to the method, the crack inhibition effect of the additive manufacturing nickel-based superalloy can be improved, and the strength and plasticity of the additive manufacturing nickel-based superalloy are improved.

The invention belongs to the technical field of nickel-based superalloys, and discloses a surface protection method of a superalloy material used in a high-temperature, high-pressure or oxygen-enriched environment. The method comprises the following steps: coating the surface of a high-temperature alloy material with a pure platinum coating; the high-temperature alloy material is used in at least one environment of high temperature, high pressure and oxygen enrichment; the high temperature ranges from 550 DEG C to 750 DEG C; the high pressure is 2 to 55 MPa; the rich oxygen is oxygen concentration gt; 90%. The oxygen-enriched ablation resistance of the high-temperature alloy material is improved, and the use safety of the high-temperature alloy material in a high-temperature, high-pressure and oxygen-enriched severe environment is improved.

This hot-rolled steel sheet has a desired chemical composition, in a microstructure at a position of ¼ from a surface in a sheet thickness direction, in terms of area %, residual austenite is less than 3.0%, ferrite is 15.0% or more and less than 60.0%, and pearlite is less than 5.0%, an E value is 10.7 or more, an I value is 1.020 or more, a CS value is −8.0×105 to 8.0×105, a standard deviation of Mn concentrations is 0.60 mass % or less, at the surface, an area ratio of a region where a Ni concentration is 0.2 mass % or more is 10.0% or more, an area ratio of a region where an O concentration is 3.0 mass % or more is 3.0% to 50.0%, and a maximum value of sphere equivalent diameters of oxides is 5.00 μm or less, and a tensile strength is 980 MPa or more.

The invention discloses a continuous annealing furnace for nickel-based superalloy and a process of the continuous annealing furnace, and relates to the technical field of nickel-based superalloy annealing, the annealing furnace comprises a supporting table and an annealing furnace body arranged at the upper end of the supporting table, the annealing furnace body comprises a feeding transfer chamber, a preheating chamber and a soaking chamber which can be communicated in sequence and can be independently sealed; the process comprises the following steps of S1, nickel-based high-temperature alloy part feeding, S2, inert gas conveying, S3, annealing treatment and S4, cooling treatment. According to the device, heat loss can be greatly reduced, air can be prevented from entering the device, the possibility that parts are oxidized is effectively avoided, the step of removing oxygen is reduced, meanwhile, the supporting position of the trapezoidal plate on the parts can be changed, follow-up preheating and soaking work on the parts is facilitated, the annealing and cooling quality is ensured, and the parts are treated more uniformly.

The invention discloses a high-power charging gun terminal plating treatment method, and relates to the technical field of automobile terminal plating. Aiming at the problems of poor wear resistance, insufficient corrosion resistance, short service life and the like of an existing charging gun terminal coating in a high-power fast charging scene, the invention provides a copper-nickel-graphite silver gradient composite coating structure. According to the structure, T2 red copper is used as a base material, a copper bottom layer, a nickel transition layer and a graphite silver functional layer are sequentially arranged, and the material ratio and the preparation process of each plating layer are optimized, so that the temperature rise of the terminal is reduced by 10-15K under the working condition of large current of 300A and above, the plugging service life can reach more than 30,000 times, meanwhile, the stable performance is kept in a high-humidity and high-salt-fog environment, and the service life of the terminal is prolonged. And the production cost and the maintenance cost are reduced.

The invention discloses a high-thermal-stability nickel-based wrought superalloy and a preparation method thereof, belongs to the technical field of superalloys, and aims to solve the problems of poor high-temperature structure stability, narrow thermal deformation process window and the like of the existing superalloy. The high-thermal-stability nickel-based wrought superalloy is prepared from the following components in percentage by mass: 9.0 to 12.0 percent of Cr, 12.0 to 16.0 percent of Co, 6.0 to 7.5 percent of W, 2.0 to 4.0 percent of Mo, 3.6 to 4.5 percent of Al, 1.4 to 2.0 percent of Ti, 1.2 to 1.8 percent of Nb, 0.2 to 0.8 percent of V, less than or equal to 1.0 percent of Fe, 0.03 to 0.10 percent of C, 0.01 to 0.03 percent of B, 0.02 to 0.08 percent of Zr, 0.01 to 0.02 percent of Ce and the balance of Ni and other inevitable impurities. Wherein the sum of the contents of W and Mo is 8.5-11.5%, and the mass ratio of W to Mo is 2.0-3.5. The high-thermal-stability nickel-based wrought superalloy has good high-temperature structure stability and excellent high-temperature performance.

The invention discloses an ultralow-temperature high-toughness non-magnetic steel flux-cored wire for a controllable nuclear fusion device and a preparation method of the ultralow-temperature high-toughness non-magnetic steel flux-cored wire. A special stainless steel strip is adopted to wrap a metal powder type flux core, and the flux core accounts for 29.6%-30.4% of the total mass of the flux-cored wire; the flux core comprises the following components: 14%-18% of electrolytic manganese, 21%-23% of chromium metal, 0.3%-1.0% of ferrotitanium, 4.4%-5.0% of nitrided ferrochromium, 27.5%-28.5% of nickel powder, 0.5%-1.0% of 52 # ferrosilicon, 8%-9% of molybdenum powder, 0.1%-0.3% of lithium fluoride and the balance of atomized iron powder. The problems that an existing non-magnetic steel welding material is insufficient in toughness and high in magnetic conductivity at the ultralow temperature of-269 DEG C are solved by optimizing flux-cored alloy elements of (nickel-chromium-nitrogen) synergistic stable austenite, matching with a manufacturing process of sealed baking and roller die drawing forming of powder at the temperature of 120-140 DEG C and a welding process protected by argon (Ar) with the purity of 99.999%. The AKV2 of a welded joint is larger than or equal to 34J at the temperature of-269 DEG C, the tensile strength is larger than or equal to 620 MPa, the relative permeability is smaller than or equal to 1.02, the problems that nitrogen of an existing solid welding wire is difficult to control, and hardening is easy can be solved, and the welding wire is completely matched with the extreme working condition of a controllable nuclear fusion device.

The invention provides a method for preparing 6N-grade high-purity nickel through multistage electrochemical refining, and belongs to the technical field of non-ferrous metal hydrometallurgy. According to the method, under the ultra-clean environment, the ultra-pure raw materials and the pulse electrodeposition technology are used, impurity precipitation is effectively inhibited, deposition layer growth kinetics is optimized, through multi-stage linkage, parameter collaboration and whole-process quality control, the problems that according to a traditional electrolytic method, impurity removal is not thorough, and the cathode deposition morphology is poor are effectively solved, and the method is suitable for industrial production. Limit purification and compact deposition are achieved, and a 6N-grade high-purity nickel cathode product with the smooth surface like a mirror and the compact and defect-free structure can be stably and efficiently obtained. The result of the embodiment shows that the purity of the high-purity nickel obtained through the method is larger than 99.9999%, and the standard of 6N-grade high-purity nickel is met.

The invention provides a nickel-based superalloy with high cobalt and gamma'content and a preparation method and application thereof, and belongs to the technical field of superalloy additive manufacturing. The invention provides spherical nickel-based high-temperature alloy powder which comprises the following components in percentage by mass: 20 to 30 percent of Co, 8 to 10 percent of Cr, 4 to 7 percent of Al + Ti, 14 to 16 percent of W + Mo + Ta, 0 to 3.5 percent of Nb, 0.001 to 0.015 percent of B, 0.05 to 0.1 percent of C and the balance of Ni. And the spherical nickel-based superalloy powder serves as a printing raw material, laser additive manufacturing is conducted, then heat treatment is conducted, and the nickel-based superalloy with the high cobalt content and the high gamma'content is obtained. The nickel-based superalloy with high cobalt and gamma'content prepared by the method has excellent high-temperature mechanical properties and excellent printability, and is suitable for direct forming of turbine blades or additive manufacturing repair of damaged turbine blades.

The invention provides a mirror surface processing method for a pure nickel heater, which comprises the following steps of: roughly milling the surface of the pure nickel heater by adopting a flat-bottomed milling cutter, and then finely milling by adopting a single crystal diamond milling cutter to obtain roughness Ralt; the invention discloses a pure nickel heater with a mirror surface effect. According to the method, the surface of the pure nickel heater is subjected to rough milling and finish milling treatment by adopting the specific cutter, so that the pure nickel heater which meets the roughness requirement and has the mirror surface effect can be obtained, and the subsequent use requirement is met.

The invention discloses a 18K gold luster imitation gold alloy suitable for the sculpture field and a preparation method thereof, the 18K gold luster imitation gold alloy comprises the following basic components in percentage by weight: 20-22% of zinc, 10-20% of copper, 10-20% of zinc, 10-20% of copper, 10-20% of copper and 10-20% of zinc. 3%-4% of aluminum; 2%-3% of silicon; 0.9% to 1.9% of nickel; 0.1% of rare earth, and the balance copper and inevitable impurities. The method has the beneficial effects that one-time forming can be directly carried out through conventional copper art sculpture machining modes such as casting and forging, follow-up complicated procedures such as gilding and gilding are not needed, the sculpture production period is greatly shortened, the manual operation difficulty is reduced, and the 18K gold appearance is accurately matched.