501 results about "Metallic Nickel" patented technology

The invention discloses a nickel-iron-based bimetallic organic framework catalyst and a preparation method thereof, and belongs to the field of electrochemical catalyst preparation, the preparation method comprises the following steps: step 1, dissolving a metal nickel salt in pure water, and carrying out ultrasonic dispersion to obtain a solution A; the preparation method comprises the following steps: dissolving a ferrocene dicarboxylic acid ligand in N, N-dimethylformamide to obtain a solution B; ultrasonically stirring and uniformly dispersing the solution A and the solution B to obtain a mixed solution; and 2, synthesizing the nickel-iron-based bimetallic organic framework catalyst from the mixed solution by using a hydrothermal method. The nickel-iron-based bimetal organic framework catalyst prepared by the preparation method disclosed by the invention shows good OER catalytic performance in an alkaline medium.

The invention relates to a stainless steel flux-cored wire for welding 5% Ni steel, the stainless steel flux-cored wire is prepared by coating powder with a stainless steel strip, the mass of the powder accounts for 22%-28% of the total mass of the flux-cored wire, and a flux core comprises the following components in percentage by weight: 15.0%-30.0% of chromium metal powder, 9.0%-20.0% of nickel metal powder, 3.0%-10.0% of molybdenum metal powder, 2.0%-8.0% of electrolytic manganese metal, 30.0%-35.0% of rutile, 0.5%-3.0% of quartz, 2.0%-8.0% of albite, 0.5%-3.0% of potassium feldspar, 0.5%-5.0% of cryolite and 0.2%-0.5% of self-made raw materials. And the balance of reduced iron powder and inevitable impurities. The external steel strip is an austenitic stainless steel strip 304L, and the carbon content of the external steel strip is smaller than or equal to 0.025%. The flux-cored wire is mainly matched with a steel plate with the Ni content being about 5% for welding, the low-temperature impact of a welded joint of the flux-cored wire at the temperature of-140 DEG C can reach 40 J, the tensile strength is larger than 600 MPa, and the flux-cored wire is good in crack resistance and excellent in comprehensive performance.

The invention discloses a preparation method of a nickel-based catalyst and the nickel-based catalyst. The preparation method of the nickel-based catalyst comprises the following steps: S1, completely dissolving an acid source, cerium salt and a solvent; s2, carrying out hydrothermal reaction on the solution obtained in the step S1; s3, carrying out solid-liquid separation on the product obtained in the step S2, and washing, drying and calcining the obtained solid product to form a carrier which is cerium dioxide derived from a metal organic framework; s4, an active component is loaded on the carrier, and the active component is metallic nickel or nickel oxide. According to the preparation method of the nickel-based catalyst, the nickel-based catalyst with relatively high specific surface area and developed mesoporous channels can be prepared, thermal agglomeration of active sites of metal nickel can be avoided, and the stability and catalytic performance of the nickel-based catalyst are improved.

The invention relates to the technical field of welding materials, and particularly discloses a high-temperature-resistant flux-cored wire containing rare earth elements and a preparation method of the high-temperature-resistant flux-cored wire. The high-temperature-resistant flux-cored wire containing the rare earth elements comprises a welding wire skin and a flux core. The flux core comprises the following raw materials of dehydrated rutile, dehydrated potassium feldspar, zircon sand, metal chromium powder, metal nickel powder, electrolytic manganese, ferrotitanium, ferro-aluminum, potassium cryolite, potassium titanate, sodium titanate, fine iron powder, yttrium-based iron alloy powder, atomized ferrosilicon, nitrided ferrochrome, bismuth oxide, auxiliaries and the balance reduced iron powder. The auxiliary agent is a mixture of a zirconium-iron alloy, a titanium-iron alloy and an aluminum-magnesium alloy. A specific alloy auxiliary is introduced into the flux core to protect stable transition of rare earth yttrium, yttrium and multiple components synergistically optimize the weld joint performance, 253MA heat-resistant steel is matched, slag and electric arc regulation and control components and a reasonable process are matched, and the welding quality of the welding wire is improved.

The invention belongs to the technical field of preparation of high-quality metallic nickel connecting strips for new energy batteries, and provides a preparation process for optimizing residual stress of a metallic nickel stamping connecting sheet for a new energy battery, which specifically comprises the steps of material selection, striping, continuous die stamping, inert atmosphere protection annealing, and residual stress detection and control. The range of corners and chamfers of a stamping die adopted in the progressive die stamping is 0.2 mm-1 mm, and the fit dimensional tolerance of a female die and a male die of the stamping die is controlled to be + / -0.05 mm; and the stamping surface in contact with the metal nickel strip is processed by adopting an electrochemical corrosion milling method, the roughness Ra of the stamping surface is less than 0.4 mu m, and the hardness HRC is more than or equal to 55. The metal nickel connecting strip prepared through the method is low in residual stress and small in size deformation after being used, the service life of the metal nickel connecting strip is prolonged, safety and reliability of the metal nickel connecting strip are improved, and the application prospect is wide.

There is disclosed a method of constructing a layered double hydroxide (LDH) material comprising selected metal ions, and employing metallic vanadium carbide (V2C) for promoting conductive properties of the LDH material, wherein the layered LDH material is a trimetallic LDH material. The trimetallic LDH material comprises selected Ni2+, Co2+, and A3+ metal ions with its cationic configuration for improving photocatalytic properties of the LDH material, wherein trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C)-based composite is coupled with a graphitic carbon nitride (g-C3N4) nanosheet, to form a hybrid-junction photocatalyst. Also disclosed is a layered structure of vanadium carbide (V2C) MXenes, comprising trimetallic nickel-cobalt-aluminium layered double hydroxide (NixCoyAlz LDH) and vanadium carbide MXene (V2C) coupled with graphitic carbon nitride (g-C3N4), forming a NixCoyAlz LDH / g-C3N4 hybrid-junction photocatalyst.

The invention relates to a nickel-magnesium alloy, a preparation method thereof and a nickel-magnesium alloy product. The preparation method of the nickel-magnesium alloy comprises the following steps that metal magnesium, metal nickel and fused salt are subjected to smelting treatment under the non-vacuum condition, and then forming treatment is conducted; the molten salt is prepared from the following components in parts by mass: 100 parts of KCl, 0 to 20 parts of MgCl2, 0 to 30 parts of KF, 0 to 20 parts of NaCl, 0.5 to 5 parts of CeCl3 and 0.5 to 5 parts of LaCl3. In the smelting process, under the non-vacuum condition, the fused salt with the specific components can cover the surface of magnesium melt, so that magnesium metal is not prone to volatilization and oxidation, the oxygen content and the inclusion content in the nickel-magnesium alloy are reduced, and the quality of the nickel-magnesium alloy is improved.

The invention relates to a polypropylene foam material with a wave-absorbing function, and belongs to the technical field of wave-absorbing materials. The polypropylene foam material with the wave-absorbing function is prepared from the following components in parts by mass: 75 to 85 parts of polypropylene resin, 15 to 25 parts of wave-absorbing filler, 3 to 4 parts of nucleating agent, 3.5 to 4.5 parts of foaming agent and 0.2 to 0.8 part of antioxidant, the preparation method of the wave-absorbing filler comprises the following steps: plating nickel on molybdenum disulfide to obtain nickel-plated molybdenum disulfide; and then the surface of the nickel-plated molybdenum disulfide is coated with copper in situ, and the wave-absorbing filler is obtained. The surface of molybdenum disulfide is sequentially coated with metal nickel, polydopamine and metal copper, the metal copper and the metal nickel can be tightly and evenly distributed on the surface of molybdenum disulfide, the metal copper and the metal nickel are tightly combined together through the polydopamine, the synergistic effect can be achieved, and the electric conductivity, the magnetic conductivity and the wave absorbing capacity are improved.

The invention provides an alkyne selective hydrogenation catalyst with high activity and high selectivity and a preparation method thereof. The catalyst is a compound of metallic nickel and alkali metal hydride and is marked as nickel-alkali metal hydride, high catalytic reaction activity and high olefin selectivity can be both considered by regulating and controlling the proportion of the nickel elementary substance and the alkali metal hydride, and compared with the metallic nickel and the alkali metal hydride as the catalyst, the catalyst has the advantages that the catalytic activity is high; the catalytic activity and the olefin selectivity are greatly improved. The nickel-alkali metal hydride catalyst is suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure fixed bed gas phase reaction system, is also suitable for alkyne selective hydrogenation reaction in a high-temperature and high-pressure reaction kettle liquid-solid phase reaction system, and has a good application prospect.

The invention discloses a metal oxide nano island modified nickel-based catalyst for low-temperature CO2 methanation as well as a preparation method and application of the metal oxide nano island modified nickel-based catalyst, and belongs to the technical field of preparation of low-temperature CO2 methanation catalysts. The catalyst comprises a metal nickel salt and a metal oxide nano island, the particle size of the metal nickel salt is 5-20 nm, and the particle size of the metal oxide nano island is 2-10 nm. The invention further discloses a preparation method and application of the metal oxide nano island modified nickel-based catalyst for low-temperature CO2 methanation. According to the novel catalyst, CO2 can be converted into CH4 under the mild conditions of 160 DEG C and 0.1 MPa, the CO2 conversion rate is close to 90% at 220 DEG C, the CH4 selectivity is 100%, and the reaction temperature is reduced by 100 DEG C compared with that of a traditional nickel-based catalyst.

The invention provides a flux-cored wire, a manufacturing method of the flux-cored wire, a gas-shielded arc welding method and deposited metal. The flux core of the flux-cored wire comprises the following components in percentage by weight: 27.5 to 29.5 percent of rutile, 1.0 to 2.0 percent of ferrovanadium, 0.2 to 0.3 percent of bismuth oxide, 0.8 to 1.2 percent of cryolite, 12.5 to 15.0 percent of high-carbon ferrochrome, 5.0 to 6.5 percent of electrolytic manganese metal, 4.5 to 6.5 percent of metal nickel, 1.0 to 3.0 percent of feldspar, 1.5 to 2.5 percent of ferromolybdenum, 1.0 to 2.5 percent of aluminum-magnesium alloy, 32.0 to 35.0 percent of micro-carbon ferrochrome, 0.5 to 1.5 percent of ferrotitanium, 1.15 to 2.85 percent of fluorite, 0.8 to 2.0 percent of ferrosilicon and 0.6 to 1.5 percent of lithium carbonate. In the invention, the alloy content of deposited metal and the hardness of the surfacing layer are controlled by adjusting the percentage of the flux core in the total weight, the surfacing layer with excellent corrosion resistance and proper hardness is ensured to be obtained, and the service life of the wrapper roller is prolonged. And meanwhile, by controlling all the components in the flux powder of the flux-cored wire and the proportion, the flux-cored wire has excellent welding process performance.

The invention discloses a Pt-Ni (OH) 2 composite hydrogen evolution catalyst and a preparation method and application thereof.The preparation method of the Pt-Ni (OH) 2 composite hydrogen evolution catalyst comprises the following steps that a platinum source, metal nickel salt and urea are dissolved in a solvent and dispersed, and a mixed solution is obtained; transferring the mixed solution into a reaction kettle, carrying out hydrothermal reaction, cooling, and carrying out solid-liquid separation on a reaction product to obtain a solid product; and finally, washing the solid product, and freeze-drying to obtain the product. According to the Pt-Ni (OH) 2 composite hydrogen evolution catalyst prepared by adopting a one-step solvothermal method, the alpha-Ni (OH) 2 component can obviously improve the hydrogen evolution catalytic activity in an alkaline electrolyte; and the interlayer spacing of alpha-Ni (OH) 2 is further expanded, so that more active sites can be exposed, the mass transfer process is accelerated, the electron transfer path is improved, the proton conductivity is improved, rapid transfer of reactants and products is promoted, and the catalytic activity is improved.

The invention belongs to the technical field of electrode plates, and particularly relates to a high-activity binary alloy hydrogen evolution electrode plate and a preparation process method. The preparation process method comprises the following steps: obtaining a metal nickel electrode substrate and white corundum sand with different particle sizes; carrying out cleaning treatment on the metal nickel initial electrode substrate; the pretreated metal nickel initial base body serves as a working electrode, and sand blasting pretreatment is conducted on a metal nickel electrode base body through white corundum sand; dust removal operation is conducted on the metal nickel electrode base body subjected to sand blasting pretreatment; and spraying binary metal alloy powder on the intermediate hydrogen evolution electrode plate through an atmospheric plasma spraying process to form the high-activity binary alloy hydrogen evolution electrode plate. The whole preparation process method sequentially comprises the steps of cleaning treatment, sand blasting pretreatment, atmospheric plasma spraying, natural cooling and the like, the process method for preparing the electrode plate is optimized, it is guaranteed that the electrode plate has excellent long-time hydrogen evolution stability when the electrode plate is subjected to a hydrogen evolution reaction, and the excellent hydrogen production effect can be achieved.

The invention provides a flux-cored wire for marine crack arrest steel and a preparation method and application of the flux-cored wire, and particularly relates to the technical field of welding materials. The flux-cored wire comprises a steel strip and a flux core filled in the steel strip, and the flux core comprises the following components in parts by weight: 10-15 parts of rutile, 5-6 parts of quartz, 2-4 parts of ferrotitanium, 20-40 parts of sodium fluoride, 20-40 parts of potassium feldspar, 6-18 parts of manganese-silicon alloy, 4-8 parts of low-carbon ferromanganese, 1.5-2.5 parts of magnesium powder, 1.5-2 parts of rare earth ferrosilicon, 0.2-0.4 part of ferroboron, 1-2 parts of metallic nickel and 1.5-6 parts of iron powder. The ship crack arrest steel flux-cored wire has the advantages of being high in strength, good in low-temperature toughness, good in crack resistance, high in deposition rate, stable in electric arc, little in splashing, easy in slag removal and attractive in weld joint forming, and is suitable for welding of crack arrest steel at a core structure part of an ultra-large container ship.

The invention provides an electrode loaded with an amorphous catalyst as well as a preparation method and application of the electrode. The preparation method comprises the steps that aluminum metal powder and magnesium metal powder are subjected to first mixing, and mixed aluminum-magnesium powder is obtained; the mixed aluminum-magnesium powder is sprayed on the surface of at least one side of a metal nickel base material in a vacuum plasma spraying mode, and the metal nickel base material loaded with an aluminum-magnesium alloy transition layer is obtained; carrying out second mixing on the amorphous metal source and an auxiliary agent to obtain mixed amorphous powder; the mixed amorphous powder is sprayed on the surface of the side, away from the metal nickel base material, of the aluminum-magnesium alloy transition layer in a cold spraying mode, an amorphous catalyst layer is obtained, and then a first electrode is obtained; and sequentially carrying out heat treatment and alkaline leaching on the first electrode to obtain the electrode loaded with the amorphous catalyst. The aluminum-magnesium alloy transition layer is firstly prepared on the metal nickel base material, and then the amorphous catalyst layer is prepared through the cold spraying technology, so that the binding force between the amorphous catalyst layer and the base material is effectively enhanced.