2203 results about "Nickel" patented technology

The present invention provides: a steel sheet which contains Ni, Cu and Sn, and has excellent chemical conversion treatability; and a component which includes said steel sheet.　A steel sheet and a component including the same according to the present invention are characterized by having a chemical composition containing, in mass %, 0.010-1.000% of Ni, 0.010-1.000% of Cu, and 0.003-1.000% of Sn, and by the emission intensities of Ni, Cu, and Sn in the surface layer of the steel sheet as measured by high-frequency glow discharge optical emission spectrometry satisfying the following relationships.　Ni: Surface layer maximum intensity / Bulk intensity ≤ 1.5 Cu: Surface layer maximum intensity / Bulk intensity ≤ 1.3 Sn: Surface layer maximum intensity / Bulk intensity ≤ 15

The invention belongs to the field of nickel-based alloy materials, and discloses a precipitation hardening type nickel-based alloy welding wire and a preparation method thereof.The precipitation hardening type nickel-based alloy welding wire comprises, by mass, 50%-60% of nickel, 15%-20% of chromium, 15%-20% of iron, 2%-4% of molybdenum, 2%-5% of niobium, 0.01%-2% of tantalum, 0.2%-2% of aluminum, 0.5%-1.2% of titanium, 0.03%-0.08% of carbon, 0.1%-0.5% of manganese, 0.1%-0.5% of silicon, 0.01%-0.05% of magnesium, 0.01%-0.05% of yttrium, 0.5%-2% of tungsten, 0.1%-0.6% of cobalt, 0.001%-0.02% of boron and the balance impurities; according to the precipitation hardening type nickel-based alloy welding wire and the preparation method thereof, through component optimization and process innovation, the nickel-based alloy welding wire with high-temperature strength, excellent hot crack resistance and welding toughness is provided.

The invention discloses a nickel-based alloy additive manufacturing method for high-frequency ultrasonic dynamic forging printing. The method comprises the steps that nickel-based alloy powder and a base plate are pretreated; scanning the nickel-based alloy powder layer by layer through laser to form a molten pool; in the machining process of each layer, when the temperature of the molten pool ranges from 1000 DEG C to 1400 DEG C, ultrasonic waves are activated to generate compound vibration; the composite vibration comprises axial vibration and transverse vibration; when the ultrasonic vibration phase difference reaches a preset first interval, short pulse laser is triggered; the ultrasonic vibration phase difference is a phase deviation between an ultrasonic vibration waveform and a pulse laser shock triggering moment; and until all layers are machined, a formed part is obtained. According to the scheme, the dislocation density is improved, secondary grain refinement and bubble escape are achieved, and interlayer stress redistribution is made uniform.

The invention discloses a nickel-based alloy composite plate and a preparation method thereof, and belongs to the technical field of nickel-based alloys, the nickel-based alloy composite plate comprises a stainless steel bottom plate and a nickel-based alloy plate, and the nickel-based alloy plate comprises, by weight, 52-58 parts of nickel powder, 17-21 parts of molybdenum powder, 8-12 parts of copper powder, 7-9 parts of boron powder, 2-3 parts of modified hafnium carbide powder, 4-7 parts of an alloy reinforcing agent and 2-3 parts of a fluxing agent. The modified hafnium carbide prepared from hafnium oxide and nano carbon powder successfully replaces metal hafnium with high cost in the traditional process; and meanwhile, the actual adding proportion of the modified hafnium carbide in the nickel-based alloy plate is greatly reduced, the cost of industrial mass production is doubly reduced from the two aspects of raw material selection and dosage control, and the economic requirement of large-scale production is better met.

The invention relates to the field of design and preparation of powder metallurgy friction materials, in particular to a copper-based powder metallurgy friction material and a preparation method thereof. Raw materials used in the method comprise, by mass, 45%-55% of copper powder, 8%-20% of iron powder, 6%-15% of ferrochromium, 16%-22% of graphite, 0.5%-4% of molybdenum disulfide, 0.5%-4% of tin sulfide and 0.5%-4% of nickel-coated tungsten disulfide, and the mass ratio of the tin sulfide to the nickel-coated tungsten disulfide is (1-2): (1-2). In the nickel-coated tungsten disulfide, the content of nickel is 5-40%; the sum of the total amount of molybdenum disulfide, nickel-coated tungsten disulfide and tin sulfide is less than or equal to 5%. The preparation method comprises the following steps: weighing raw material powder according to the designed components, mixing, pressing and sintering to obtain the product. The composition design has the characteristics of scientificity, simple and controllable process and the like, and the obtained product has excellent tribological performance and completely meets the friction braking requirement of high-speed heavy-load equipment of 400km / h and above.

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 bainite plastic die steel comprises the following components in percentage by mass: 0.01-0.15% of C, 0.25-1.0% of Si, 0.5-2.0% of Mn, less than or equal to 0.045% of P, less than or equal to 0.015% of S, 2.0-5.0% of Cr, 1.01-2.0% of Ni, 0.0010-0.0050% of B, 0.004-0.008% of N and the balance of Fe and other inevitable impurities, and the following requirements are simultaneously met: the hardness index is more than or equal to 28 and less than or equal to 13.8 + 132.8 C + 2.34 Mn + 1.84 Cr-1.12 Ni and less than or equal to 38, and the bainite index is C 0.5 * Mn 1.4 * Cr 4 * Ni * N-1. 05 / 20 and less than or equal to 2000. According to the die steel, the tensile strength is larger than or equal to 800 MPa, the hardness is 28-38 HRC, the hardness difference value of the section of a steel plate with the thickness of 15-300 mm is smaller than or equal to 2 HRC, the straightness is smaller than or equal to 2 mm / m, and the flaw detection quality meets the E / e level requirement in the SP1921-84 standard. The method can be applied to manufacturing of plastic parts in the fields of automobiles, household appliances, medical treatment, electronics 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.

A method for joining, by brazing, a first part and a second part, the steps of preparing at least one of the parts including the following: a) providing a part intended to be brazed, the part being made of carbon or based on titanium, nickel or a CoCr alloy, b) performing inert gas plasma treatment on the part whereby the part is cleaned and an active surface is formed on the part, c) depositing a first layer comprising an active element on the active surface of the part, the active element being a carbide-forming element, d) depositing a second layer of gold on the first layer, whereby the first layer is protected from oxidation and good wetting is ensured.

According to the preparation method and the application of the high-nickel positive electrode material with the core-shell structure, the deep charge-discharge specific capacity and the cycling stability of the layered positive electrode material are remarkably improved by controlling the calcination condition of the high-nickel positive electrode material in an oxygen-free environment, regulating and controlling the oxygen vacancy on the surface of the material and synthesizing the sample with the core-shell structure. Meanwhile, the method is simple, effective and low in cost, and the prepared material is good in morphology uniformity and suitable for large-scale production.

The invention belongs to the technical field of high-temperature alloy heat treatment, and discloses a method for improving the hot working performance of a nickel-based high-temperature alloy for a molten salt reactor by combining pre-deformation and homogenization. The method comprises the steps that raw materials of the nickel-based superalloy for the molten salt reactor to be improved are sequentially subjected to vacuum induction melting, pouring and electroslag remelting refining treatment, and an electroslag remelting refined alloy cast ingot is obtained; the electroslag remelting refined alloy cast ingot is sequentially subjected to heating, heat preservation and pre-deformation treatment and is air-cooled to the room temperature, and a pre-deformed cast ingot is obtained; and the pre-deformed cast ingot is subjected to homogenization treatment and air cooling to the room temperature, and the method is completed. The method is a novel heat treatment process combining pre-deformation and high-temperature homogenization, the hot working performance of the alloy is optimized, the high-temperature alloy uniform in structure and excellent in mechanical property is obtained, and application in the field of high-temperature molten salt energy systems is met.

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 invention discloses a preparation method of a mine filling material based on iron-rich solid waste and the obtained material.The preparation method comprises the steps that 5-30 parts by mass of steel slag powder, 40-50 parts by mass of copper slag powder, 5-20 parts by mass of red mud, 25-50 parts by mass of ferronickel slag powder, 10-12 parts by mass of carbide slag and 10-12 parts by mass of alkaline residues are subjected to dry mixing; then adding 10-15 parts by mass of water glass, 5-10 parts by mass of a water reducing agent, 5-10 parts by mass of a foaming agent and 10-40 parts by mass of water, mixing and stirring, and finally adding 100-250 parts by mass of tailings, and stirring again to obtain the mine filling material. According to the invention, various industrial wastes are utilized as resources and completely replace traditional cement raw materials, so that the production cost and carbon emission of the mine filling material are remarkably reduced, and the prepared mine filling material is good in compressive strength and improved in mechanical property.

The invention provides a nickel-based high-temperature alloy cutting microstructure prediction method based on a dislocation gradient model, and aims to realize optimization of process parameters through multi-scale modeling. The method comprises the following steps: firstly, calculating dislocation mobility under different temperature and pressure conditions by utilizing molecular dynamics simulation; and a dislocation generation and annihilation rate model is established in combination with a dislocation dynamics theory, so that a dynamic relationship between cutting strain and dislocation evolution is disclosed. And further through data fitting, a constitutive equation between the dislocation density and the material hardening behavior is constructed, and the evolution law of the dislocation cell structure is described emphatically. On an ABAQUS platform, a two-dimensional cutting model containing a thermal coupling effect is established, a dislocation density constitutive equation is embedded into a user-defined material module, and closed-loop correlation of macroscopic cutting parameters and microstructure evolution is achieved. According to the method, the dislocation density is creatively used as a cross-scale bridge, the understanding of a dynamic recrystallization and dislocation motion coupling mechanism in the cutting process is deepened, a prediction model is provided for technological parameter optimization, and the method has important engineering guiding significance for improving the integrity of the machined surface of the high-temperature alloy part.

The invention discloses a bimetal composite plate with an X90-grade composite layer made of nickel base alloy Inconel625 and a manufacturing method of the bimetal composite plate. The bimetal composite plate comprises the following chemical components in percentage by weight: base material components including C, Si, Mn, Cr, Ni, Mo, Cu, Nb, V, less than or equal to 0.05% of Al, Ti and the balance of Fe and inevitable impurity elements; the composite material comprises the following components: less than or equal to 0.08% of C, less than or equal to 0.5% of Si, less than or equal to 0.5% of Mn, 20.0-23.0% of Cr, 8.0-10.0% of Mo, 3.15-4.15% of Nb, less than or equal to 5.0% of Fe, less than or equal to 0.05% of Al, less than or equal to 0.05% of Ti and the balance of Ni and inevitable impurity elements. According to the invention, the components are comprehensively optimized, and proper rolling and tempering processes are matched to obtain the bimetal composite plate with yield strength not lower than X90 and excellent corrosion resistance for the oil and gas transmission line pipe.

The invention relates to a multi-physics field coupling method for a smelting process of a ferronickel heating furnace, and relates to the multi-physics field coupling method for the ferronickel heating furnace, the method comprises the following steps: establishing a ferronickel heating model, importing the ferronickel heating model into ICEM software for grid division, and finally importing a grid into FLUENT; according to the method, based on a Maxwell's equation and an Ohm's law, an electrothermal conversion algorithm, an electromagnetic induction algorithm and a multiphase heat transfer and mass transfer algorithm are compiled in combination with a user-defined function (UDF), so that a mathematical analysis model for mutual coupling of multiple physical fields, multiphase flows and furnace body thermal stress in smelting of the submerged arc furnace is established. The model is combined with a radiation model, a turbulence model, a multi-phase flow model and a static structure model, a heat and mass transfer mechanism among an electric arc, a molten pool and a furnace body is disclosed, an influence mechanism of a furnace body structure and a multi-physical field on furnace body temperature distribution is explored, and an action mechanism between the furnace body temperature and thermal stress is clarified, so that the deformation position and deformation amount of the furnace body are predicted.

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.

To provide a calcined body that is processed easier than a conventional calcined body and where differences in hardness between production lots are suppressed.SOLUTION: A calcined body comprises: at least one first transition metal element selected from the group consisting of manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), and silver (Ag); a coloring element of at least one of a lanthanoid rare earth element and a second transition metal element different in kind from the first transition metal element; and zirconia containing a stabilizing element. A content of the first transition metal element is 100 mass.ppm or more, a content of the second transition metal element is less than 100 mass.ppm, and an absolute value of a difference in hardness relative to a hardness of a calcined body obtained from a commercially available powder is 10 HV or less.SELECTED DRAWING: None

The invention relates to the technical field of petrochemical equipment, and discloses a Ni-Cr-Mo corrosion-resistant alloy seamless tube for petrochemical equipment and a manufacturing method, the seamless tube comprises the following components: C < = 0.01%, Si < = 0.05%, Mn < = 0.30%, P < = 0.015%, S < = 0.005%, 22.2-24.0% of Cr, 16.0-17.0% of Mo, T < = 0.10%, A < l > < = 0.30%, 1.3-1.9% of Cu, Co < = 0.50%, Fe < = 1.5%, Nb < = 0.10%, W < = 0.40%, N < = 58.0%, and the sum of the components is 100%. By accurately controlling the proportion of alloy components and strictly limiting the contents of elements such as carbon, silicon, phosphorus and sulfur, key elements such as chromium, molybdenum and nickel are reasonably blended. Wherein the carbon content is strictly controlled not to exceed 0.01%, so that the precipitation of carbides is effectively avoided, and the intergranular corrosion resistance is improved; and the chromium content is controlled to be 22.2-24.0%, so that the oxidation resistance and the corrosion resistance are enhanced. All the elements have a synergistic effect, so that the alloy seamless tube has high strength, good toughness and excellent corrosion resistance, and can stably work in a high-temperature and high-pressure petrochemical environment accompanied by a strong corrosive medium.

The invention discloses conductive nickel powder, a preparation method and an electronic product, relates to the technical field of conductive materials, and aims to improve the conductivity of nickel powder while giving consideration to the electromagnetic shielding function of the conductive nickel powder. According to the preparation method, the nickel powder coating the surface of the carbon nano tube is prepared, so that the prepared nickel powder is easier to break through the infiltration phenomenon, and in order to further improve the application performance of the conductive nickel powder, a polyaniline chain segment introduced with a camphorsulfonic acid structure is further prepared and formed on the surface of the nickel powder; the conductivity of a polyaniline structure is improved, the surface polarity of the nickel powder is improved, and the compatibility with resin is improved; finally, the conductive nickel powder can have high dispersity and high compatibility while having high conductivity in the conductive adhesive, and the use performance of the conductive nickel powder is improved.

The invention provides a precursor material with a coated core-shell structure as well as a preparation method and application of the precursor material. The precursor material comprises an inner core, a middle shell layer and a shell coating layer, the inner core is made of a high-nickel ternary precursor material; the middle shell layer is made of a first manganese-rich ternary precursor material; the material of the shell coating layer comprises a second manganese-rich ternary precursor material; the molar percentage content of Ni is sequentially reduced from the inner core to the middle shell layer and then to the outer shell coating layer. By designing the structure of the precursor material, the thermal stability and the structural stability of the material are improved while the high-energy density requirement of the ternary positive electrode material is met, and the shell coating layer can also be used as a protective layer to prevent an electrolyte from being in contact with the interior and reduce the side reaction of an interface; the energy density, the safety performance and the cycle life of the ternary positive electrode material are synchronously improved.

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 belongs to the technical field of brazing materials, and discloses high-entropy composite brazing filler metal and a preparation method and application thereof. The high-entropy composite brazing filler metal comprises a nickel-based brazing filler metal matrix and high-entropy alloy powder, and the high-entropy alloy powder comprises, by atomic percent, 15%-25% of Co, 15%-25% of Cr, 15%-25% of Fe and 25%-45% of Ni. According to the high-entropy composite brazing filler metal, the low melting temperature is kept, the high-entropy alloy particles can adjust joint residual stress caused by the large difference of thermal expansion coefficients of dissimilar materials, the interface regulation and control effect is achieved, generation and distribution of joint brittle phases are affected, a special core-shell structure is formed around the high-entropy particles, and therefore the high-entropy composite brazing filler metal can be obtained. A continuous brittle phase formed by a joint can be broken, crack propagation is prevented, the mechanical property of the joint is remarkably improved, the brazing filler metal preparation method is simple and easy to implement, and the high-entropy composite brazing filler metal adopts an instantaneous liquid diffusion brazing mode, so that weld joint structure components are homogenized.

The invention discloses a double-metal gradient diffusion layer modified high-nickel ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: filtering and uniformly dispersing high-nickel ternary positive electrode material powder; introducing inert gas into the atomic layer deposition system, and raising the temperature to a target temperature; respectively preheating the metal precursors A and B to proper temperatures; the preparation method comprises the following steps: sequentially introducing a metal precursor A, precursor water, a metal precursor B and precursor water into a reaction chamber, alternately depositing according to a pulse-reaction-purging sequence, and repeatedly circulating the process to obtain the bimetallic oxide coated high-nickel ternary positive electrode material, and post-annealing treatment. According to the bimetal gradient diffusion layer modified high-nickel ternary positive electrode material prepared by the preparation method disclosed by the invention, the lithium storage performance of the high-nickel ternary material is greatly improved, excellent cycling stability and rate capability are obtained, the coating layer is accurate and controllable, the preparation process is simple, meanwhile, large-batch production can be realized, and relatively high application value is achieved.

The invention provides a sample dissolving method of a nickel-based alloy, and belongs to the technical field of analytical chemistry, and the nickel-based alloy comprises the following components in percentage by mass: 0.15-0.20% of C, 0.15-0.20% of B, 0.15-0.20% of C, and the balance of Fe and inevitable impurities. Comprising the following steps: preliminarily dissolving a sample through concentrated hydrochloric acid and concentrated nitric acid; adding perchloric acid, and preserving heat for 1-2 minutes at the temperature of 100-120 DEG C to obtain a yellow insoluble substance, the ratio of the adding volume of the perchloric acid to the mass of the sample being (110-130) mL: 1g; transferring the liquid and the yellow insoluble substance into a second reaction cup, adding hydrofluoric acid, and keeping the temperature at 50-60 DEG C for 2-4 minutes; and fixing the volume after dissolving. Firstly, concentrated hydrochloric acid and concentrated nitric acid are adopted for dissolution, due to the fact that the content of Cr, Mo and W is high, and detection of Ce, Si and other metals cannot be affected, the adding mode of the concentrated nitric acid and the concentrated hydrochloric acid is limited, then perchloric acid is added, fuming of the perchloric acid is controlled, and the content of the perchloric acid and the content of the concentrated nitric acid which are added in the earlier stage are combined; the method has the advantages that low Cr content due to generation of CrO2Cl2 is avoided while metal carbides are dissolved, undissolved yellow substances are dissolved in combination with hydrofluoric acid, and low Si content due to generation of SiF4 is avoided.

The present invention discloses a method for separating nickel and iron from a nickel-iron alloy by chlorination roasting: (1) placing the nickel-iron alloy in a roasting furnace; (2) introducing a gaseous chlorinating agent into the roasting furnace for staged roasting to obtain roasting slag and a roasting gas phase; wherein the gaseous chlorinating agent is a mixture of chlorine and gaseous ferric chloride; and (3) condensing the roasting gas phase obtained in step (2) in stages to obtain solid ferric chloride and liquid silicon tetrachloride, respectively. The present invention controls the composition of the chlorinating agent during the chlorination roasting process to achieve selective and directional volatilization of iron into the gas phase while preventing nickel from being chlorinated. Thus, nickel and iron in the nickel-iron alloy can be separated in a single step, and the process flow is short.

The invention belongs to the technical field of nickel-based alloy material processing and forming, and particularly relates to a preparation method and application of a powder metallurgy and isothermal forging In738 disc shaft ring piece. The hot isostatic pressing technology is adopted for preforming the blank, internal gaps and cracks of the material are eliminated, the structure is homogenized, element segregation is improved, the fatigue life is prolonged, and a plastic blank is provided for subsequent isothermal forging. Furthermore, the temperature difference between the blank and the mold is reduced through preheating treatment, deformation resistance sudden change caused by local chilling is avoided, and microcrack initiation is inhibited. In addition, dynamic recrystallization is promoted through isothermal forging, a fine equiaxed crystal structure is obtained, and the high-temperature strength is improved; and through solution treatment, grain coarsening is inhibited, a supersaturated solid solution is reserved, and driving force is provided for aging precipitation. And then a dual-mode gamma'phase strengthening system is formed through a two-stage aging process, and the endurance life is optimized. Therefore, the high-temperature comprehensive mechanical property of the In738 nickel-based alloy is improved, and the use requirement of the In738 nickel-based alloy at high temperature is met.