16 results about "Nickel ferrite" patented technology

The invention discloses a polyurethane flame-retardant sound-insulation composite board with a multi-layer structure and a preparation method thereof, and belongs to the technical field of composite boards, nickel nitrate is used as a nickel source, ferric nitrate is used as an iron source, nickel ferrite powder is obtained through a solvothermal method and a high-temperature calcination method, the nickel ferrite powder is compounded with graphene oxide to obtain composite aerogel powder, the surface of the composite aerogel powder is coated with polydopamine, and the flame-retardant sound-insulation composite board with the multi-layer structure is obtained. The enhanced aerogel powder is obtained; the preparation method comprises the following steps: preparing functional rigid polyurethane foam from polyether polyol, polymethylene polyphenyl polyisocyanate, enhanced aerogel powder, ammonium polyphosphate, magnesium hydroxide and a foaming aid through a one-step foaming method, putting the functional rigid polyurethane foam as a core layer between an aluminum-magnesium-manganese alloy color steel plate and a porous sound insulation plate, and carrying out hot-pressing compounding, so as to obtain the aluminum-magnesium-manganese alloy color steel plate / porous sound insulation plate. The polyurethane flame-retardant sound-insulation composite board with the multi-layer structure is obtained; and comprehensive improvement of flame retardance, sound insulation, heat insulation, electromagnetic shielding and dimensional stability is realized.

The application discloses a kind of nickel ferrite solid-state reference electrode for concrete and its design method, nickel ferrite solid-state reference electrode for concrete, including tube body and wire, cement paste layer, alkaline colloid layer, electrode material layer, conductive layer and packaging layer are sequentially arranged in tube body, one end of wire passes through packaging layer and is connected with conductive layer.Design method includes the following steps: the resistivity of cement paste layer, alkaline colloid layer, electrode material layer, conductive layer and packaging layer is calculated;Determine the target resistance and inner diameter size of nickel ferrite solid-state reference electrode;The thickness of cement paste layer, alkaline colloid layer, electrode material layer, conductive layer and packaging layer is calculated;Prepare nickel ferrite solid-state reference electrode for concrete.The general reference electrode is prepared in the application, the contact area of electrode layer and conductive layer increases, since the conductive performance of conductive layer is significantly better than electrode layer material, use the electrode material containing nickel ferrite, the potential stability and repeatability of prepared reference electrode are significantly improved.

The invention discloses a film-forming lubricating wear-resistant lead screw working fluid and a preparation method thereof. The processing liquid is prepared from the following components in parts by weight: 12 to 28 parts of surface modified nano nickel ferrite, 2.5 to 8.5 parts of ferroferric oxide, 6 to 15 parts of a compound adhesive, 8 to 22 parts of a compound dispersant, 0.8 to 3.2 parts of a compound antioxidant and 50 to 99 parts of base oil. The preparation method comprises the steps of step-by-step modification, ultrasonic dispersion and high-shear homogenization. Through a magnetic synergistic lubrication system and a rapid film forming technology, the technical problems of insufficient lubrication performance, poor wear resistance and difficult film forming of the traditional screw rod working fluid are solved. Compared with the traditional cutting fluid, the optimal embodiment of the invention realizes the remarkable effects that the friction coefficient is reduced by 57.1%, the tool wear is reduced by 42.5%, the surface roughness is improved by 60.4%, and the dispersion stability exceeds 30 days.

A transmission line is disclosed which includes a first conductor, a second conductor, a composite disposed between the first conductor and the second conductor, the composite includes non-linear inclusions comprising one or more of non-linear dielectric and non-linear magnetic inclusions mixed in a matrix material, wherein the non-linear dielectric inclusions are selected from the group consisting of barium strontium titanate (BST), barium titanate, strontium titanate, barium zirconate titanate, lead zirconate titanate, lead titanate, lithium niobate, potassium niobate, lead scandium tantalate, strontium barium niobate, and combinations thereof, and the non-linear magnetic inclusions are selected from the group consisting of nickel zinc ferrite (NZF), manganese zinc ferrite, cobalt ferrite, manganese ferrite, zinc ferrite, nickel ferrite, and combinations thereof, wherein the non-linear inclusions by volume are about 25% NZF, about 10% BST / 15% NZF, and about 15% BST / 10% NZF, and wherein the first conductor, the second conductor, and the composite form a capacitor.

The application relates to the field of photocatalysis, in particular to a composite photocatalyst for removing methylene blue and a preparation method and application thereof. The preparation method of the composite photocatalyst for removing methylene blue comprises the following steps: mixing a mixed solvent containing choline chloride, ethylene glycol and water, a nickel source, an iron source and citric acid, and performing a complexing reaction, then adjusting the pH value of the reaction system, and performing a self-propagating reaction by heating to obtain a precursor; the precursor is calcined to obtain the composite photocatalyst; the main components of the composite photocatalyst include NiFe2O4, alpha-Fe2O3 and Ni3Fe. The composite photocatalyst with the main components of NiFe2O4, alpha-Fe2O3 and Ni3Fe can be obtained by adopting the method, the composite photocatalyst can overcome the shortcomings of pure nickel ferrite and alpha-Fe2O3 as photocatalysts, and the photocatalytic capacity is further improved.

The invention provides a preparation method of a nickel-iron sulfide loaded MOF (Metal Organic Framework)-based electrolytic seawater catalyst. The preparation method comprises the following steps: firstly, growing a ferro-nickel metal organic framework material NiFe-MOF on the surface of foamed nickel in situ through a solvothermal method; and then, part of NiFe-MOF is subjected to in-situ conversion into nickel iron sulfide nanoparticles by utilizing a vapor deposition technology, so that the sulfide-loaded NiFe-MOF (NiFe-MOF-S) is formed. The material can realize high activity and super durability required by direct seawater electrolysis in an alkaline seawater electrolyte. When the prepared sulfide-loaded NiFe-MOF material is used for seawater electrolysis oxygen evolution reaction, the electrocatalyst shows relatively low overpotential and good long-term operation stability.

The invention discloses a preparation method and application of eutectic composite metal ceramic. The method comprises the following steps: mixing ytterbium oxide, nickel oxide and iron oxide, carrying out pressure molding to obtain a green body, sintering the green body in an air atmosphere to obtain a sintered body, and melting, cooling and crushing the sintered body to obtain eutectic ceramic particles; and the eutectic ceramic particles, nickel ferrite powder and an adhesive are mixed and molded, then calcined, degummed and fired, and the eutectic composite metal ceramic is obtained. According to the method, a metal powder raw material is not used, a metal phase is separated out at the grain boundary of eutectic particles in an in-situ oxygen loss mode, and the corrosion resistance of the material is greatly improved on the basis that the conductivity of the material is guaranteed. The prepared eutectic composite metal ceramic inert anode material has important application in the fields of zero-carbon molten salt electrolytic aluminum, zero-carbon molten salt electrolytic magnesium, zero-carbon molten salt electrolytic rare earth, zero-carbon molten salt electrolytic carbon dioxide and the like.

FIELD: welding.SUBSTANCE: invention can be used for welding a ceramic inert anode based on nickel ferrite and a metal conductive block of an aluminium electrolyser. A ceramic inert anode based on nickel ferrite and a metal conductive block is produced and processed to form the surfaces to be joined. Producing a transition metal alloy foil and attaching the surfaces to be joined of a ceramic inert anode and a metallic conductive block, respectively, to two surfaces of the transition metal alloy foil to form a prefabricated connecting body. Vacuum diffusion welding is performed on a prefabricated connecting body at a diffusion temperature of 950 to 1200 °C, heating speeds from 10 to 30 °C / min, thermal insulation time from 2 to 20 min, pressure from 5 to 30 MPa and cooling rate from 4 to 8 °C / min.EFFECT: improved efficiency.6 cl, 3 dwg, 3 ex

The invention discloses a nickel ferrite catalytic material as well as a preparation method and application of the nickel ferrite catalytic material with a controllable crystal face, and belongs to the technical field of electro-catalysis. The preparation method comprises the following steps: fixing a conductive substrate in a cavity of a magnetron sputtering coating machine, ensuring that the substrate is parallel to a target surface, and setting a target-substrate distance to be 2-20cm; the cavity of the magnetron sputtering coating machine is pre-vacuumized, and glow cleaning is carried out after inert gas is introduced; nickel ferrite is used as a target material, a nickel ferrite catalytic layer is deposited in situ on the surface of the conductive base material through physical vapor deposition, and the nickel ferrite catalytic material is obtained. According to the method, the magnetron sputtering technology is adopted, the target-substrate distance is changed, effective regulation and control over the nickel ferrite crystal face structure are successfully achieved, and the electronic structure and the surface adsorption / desorption energy barrier of the material can be remarkably influenced by the fine change of the crystal structure; therefore, three bottlenecks of low activity, poor stability and slow dynamics confronted by nickel ferrite as an OER catalyst are synchronously broken through, and key material and technical support is provided for commercial application of an AEM electrolytic cell.

The invention discloses a nickel ferrite-based electromagnetic wave-absorbing composite material and a preparation method thereof, and belongs to the technical field of wave-absorbing materials, nickel ferrite nano porous particles are subjected to carbon heat treatment to obtain heat-treated nickel ferrite matrix powder, and then a two-dimensional molybdenum disulfide nanosheet is loaded on the surface of the heat-treated nickel ferrite matrix powder with a three-dimensional structure to obtain the nickel ferrite-based electromagnetic wave-absorbing composite material. And finally, the nickel ferrite / molybdenum disulfide composite powder is subjected to surface modification through a conductive polymer polyaniline, and the electromagnetic wave-absorbing composite material based on the nickel ferrite can be obtained. The effective bandwidth of the electromagnetic wave-absorbing composite material can reach 9 GHz under the thickness of 2 mm through multi-stage cooperation of oxygen vacancies, sulfur vacancies, conductive coating, heterostructures and other characteristics, and continuous coverage of 8-18 GHz is achieved.

The invention discloses a method for strengthening degradation and conversion of lignocellulose through photo-Fenton treatment, which comprises the following steps: (1) mixing crushed straws with a hydrogen peroxide solution, activated carbon doped nickel ferrite nanoparticles and deionized water to obtain a mixed solution; (2) carrying out white light irradiation on the mixed solution while carrying out oscillation treatment, and then carrying out solid-liquid separation to obtain supernate and residues; and (3) performing enzymolysis saccharification on the residues. The straw is pretreated by adopting a photocatalysis and Fenton reaction synergistic mode, so that the effects of degrading and removing lignin, well retaining cellulose and efficiently performing enzymolysis saccharification are achieved.

The application provides a preparation method of a nickel ferrite catalyst, and comprises the following steps: a) dissolving Ni(NO3)2 . 6H2O, Fe(NO3)3 . 9H2O in a mixed solvent to obtain a mixed metal salt solution; the mixed solvent is a mixed solvent of water and an alcohol solvent; b) adding a basic solution dropwise into the mixed metal salt solution to obtain a mixed solution; c) performing heat treatment on the mixed solution, and then performing solid-liquid separation to obtain an initial nickel ferrite powder; and d) performing annealing treatment on the initial nickel ferrite powder in a reducing atmosphere to obtain the nickel ferrite catalyst. The preparation method is simple and efficient, and can effectively solve the problems of low oxygen vacancy density of the nickel ferrite, unstable vacancy structure and high preparation cost, improve the OER performance of water electrolysis hydrogen production, and can be successfully used in the field of industrial water electrolysis under high current density.

The invention relates to the technical field of target material preparation, and provides a nickel ferrite target material and a preparation method thereof.The preparation method comprises the steps that NiO powder and Fe2O3 powder are provided and sequentially subjected to mixed ball milling, drying and calcination treatment with a dispersing agent and a solvent, and NiFe2O4 calcined powder is obtained; the A-doped Fe3O4 powder, NiFe2O4 calcined powder, a dispersing agent and a solvent are mixed, ball-milled and dried, and mixed powder is obtained; a is selected from at least one of MnO2, CuO, CoO, Cr2O3 and MgO; and carrying out pre-pressing treatment and hot-pressing treatment on the mixed powder, and then machining to obtain the nickel ferrite target material. The A-doped Fe3O4 powder is introduced, and Fe < 2 + > and Fe < 3 + > exist on octahedral sites in a crystal structure of the A-doped Fe3O4 powder at the same time, so that electron exchange can be realized through an oxygen ion bridge, a conductive path is constructed in the material, the conductivity of the target material is improved, and the requirement of a direct-current sputtering process is met.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a multi-component high-entropy alloy nickel ferrite composite anode material and a preparation method thereof. Through cooperation of the high-entropy alloy and the nickel ferrite, the overall performance of the anode is remarkably improved, the high-entropy alloy provides good conductivity and structural support, and the nickel ferrite provides excellent corrosion resistance and electrochemical inertness. Moreover, the preparation method of the anode material is controllable in process, rich in raw materials and suitable for industrial amplification. The result of the embodiment shows that the anode material provided by the invention is high in density and excellent in corrosion resistance.

The application relates to the technical field of target material preparation, and provides a nickel ferrite target material and a preparation method thereof, which comprises the following steps: providing NiO powder and Fe2O3 powder, and sequentially mixing, ball milling, drying and calcining the NiO powder and the Fe2O3 powder with a dispersant and a solvent to obtain NiFe2O4 calcined powder; mixing, ball milling and drying Fe3O4 powder doped with A, the NiFe2O4 calcined powder, the dispersant and the solvent to obtain mixed powder; A is at least one selected from MnO2, CuO, CoO, Cr2O3 and MgO; and the mixed powder is subjected to pre-pressing treatment and hot-pressing treatment, and then is machined to obtain the nickel ferrite target material. The Fe3O4 powder doped with A is introduced, Fe 2+ and Fe 3+ exist on octahedral sites in the crystal structure of the Fe3O4 powder doped with A, so that electron exchange can be realized through oxygen ion bridges, a conductive path is constructed in the material, the conductivity of the target material is improved, and the direct-current sputtering process requirement is met.

The application relates to the field of material preparation, and relates to an aluminum and phosphorus co-doped heterostructure cobalt trioxide / iron nickel oxide / foam nickel composite nanomaterial and a preparation method and application thereof. The aluminum and phosphorus co-doped heterostructure cobalt trioxide / iron nickel oxide / foam nickel composite nanomaterial has a heterostructure of two-dimensional nanosheet layers grown on nanowires, is beneficial to mass and charge transmission, changes the electronic structure of Co3O4 and NiFe2O4 through aluminum and phosphorus co-doping, further improves the electrocatalytic performance, meanwhile, the aluminum and phosphorus co-doped heterostructure cobalt trioxide / iron nickel oxide / foam nickel composite nanomaterial preparation method adopts simple raw materials and process equipment, is low in cost, is beneficial to large-scale production, is expected to produce good social and economic effects, and has good catalytic electrolytic water oxygen evolution reaction activity in an alkaline environment.