28 results about "Vanadium nitride" patented technology

This invention relates to the field of metallurgical technology, and more particularly to a method for preparing vanadium nitride using a mixed reducing gas. The method includes: grinding vanadium trioxide uniformly and pressing it into vanadium pentoxide tablets; placing the tablets in an electric furnace; first heating to 500-700°C under a nitrogen atmosphere; then introducing a mixed gas of methane, hydrogen, and nitrogen and holding for 20 minutes; then further heating to 800-850°C and holding for 20 minutes to obtain high-purity vanadium trioxide; subsequently heating to 1050-1150°C and holding for 1-5 hours to obtain crude vanadium nitride; stopping the introduction of the reducing gas and holding at 1050-1150°C for 0-4 hours under a nitrogen atmosphere; and then cooling to room temperature to obtain high-quality vanadium nitride. The technical solution mentioned in this invention features a low-temperature, short-time, and simple-to-operate vanadium nitride preparation process, enabling its large-scale application. Simultaneously, the resulting products are carbon monoxide and hydrogen, both of which can be recycled, thus helping to reduce carbon emissions.

The invention discloses a low-temperature steel flux-cored wire and a preparation method and application thereof, and belongs to the field of flux-cored wires. The flux-cored wire comprises a stainless steel strip and flux-cored powder filled in the stainless steel strip, and the flux-cored powder comprises, by mass, 37%-41% of electrolytic nickel powder, 18%-22% of metal chromium powder, 2.2%-3.2% of chromium nitride, 2.0%-3.5% of molybdenum powder, 16%-21% of electrolytic manganese powder, 1.6%-1.8% of pre-alloyed silicon-titanium-iron powder, 0.45%-0.55% of rare earth silicon iron, 0.6%-0.8% of vanadium nitride, 0.4%-0.6% of yttrium-stabilized zirconia, 0.08%-0.12% of boron-nickel alloy, 1.5%-2.0% of ferroniobium powder and the balance iron powder. And the balance iron powder. Through the design of the low-carbon and high-alloy flux core powder, the strength of a welding material is matched with that of a low-temperature steel base material, and good toughness, high strength and excellent corrosion resistance of the material are kept in an extremely low-temperature environment.

The present disclosure relates to methods of forming a vanadium nitride-containing layer. The methods include providing a substrate within a reaction chamber of a reactor and depositing a vanadium nitride-containing layer on a surface of the substrate, where the deposition process includes providing a vanadium precursor to the reaction chamber and providing a nitrogen precursor to the reaction chamber. The present disclosure also relates to structures and devices including a vanadium nitride-containing layer.

The invention discloses a method for reducing production cost by using vanadium slag, which fully utilizes the vanadium slag to produce HRB400E so as to reduce consumption of vanadium-nitrogen alloy and argon, the vanadium slag is added into molten steel during refining treatment, vanadium in the vanadium slag is reduced into the molten steel, argon is replaced by nitrogen serving as a bottom blowing medium, the nitrogen is decomposed into free nitrogen in a high-temperature state, and the free nitrogen is decomposed into free nitrogen in a high-temperature state. And free nitrogen reacts with reduced vanadium to produce vanadium nitride, so that vanadium slag alloy is replaced, the synthesis cost is reduced, and the method is one of the inventions for low-cost production. According to the method, argon is replaced by cheap nitrogen, and the method is an invention for low-cost production. According to the method, after the vanadium slag is added, the reduction reaction is performed to produce SiO2, the SiO2 in the vanadium slag reacts with CaO in the slag to produce low-melting-point calcium silicate, the melting point of the slag is reduced, fluorite is replaced, and the method is the third invention of low-cost production. The comprehensive application components of the three aspects reduce the production cost.

The invention relates to the technical field of metallurgy, and particularly discloses a material modifier for ultrahigh-chromium high-carbon cast iron, the ultrahigh-chromium high-carbon cast iron and a smelting method of the ultrahigh-chromium high-carbon cast iron. The material modifier for the ultrahigh-chromium high-carbon cast iron is alloy metal powder and comprises the following raw materials in parts by weight: 6-8 parts of ferroniobium powder, 0.2-0.4 part of chromium nitride, 0.2-0.4 part of tungsten nitride, 0.15-0.25 part of vanadium nitride, 0.3-0.5 part of molybdenum nitride, 0.5-1.5 parts of chromium carbide and 3-5 parts of silicon carbide. The impact toughness and Rockwell hardness of the ultrahigh-chromium and high-carbon cast iron using the material modifier for the ultrahigh-chromium and high-carbon cast iron are as high as 4.90 J / cm < 2 > and 68.5 HRC, the toughness and hardness of the ultrahigh-chromium and high-carbon cast iron are improved, the minimum wear rate is 0.30%, and the ultrahigh-chromium and high-carbon cast iron has high wear resistance.

This invention discloses a surface-modified current collector, an all-solid-state battery, its preparation method, and an electrical device. The surface-modified current collector includes a negative electrode current collector substrate, a lithium storage layer, and a lithiophilic layer arranged sequentially along the thickness direction. The lithium storage layer has a plurality of micropores oriented perpendicularly to and / or inclined to the surface of the negative electrode current collector substrate. The lithium storage layer includes a conductive micropore template with a micropore structure having a plurality of micropores with the same orientation as the micropores and a vanadium nitride layer disposed on the surface of the conductive micropore template and the inner wall of its micropore structure. This lithium storage layer constitutes a three-dimensional conductive framework, which can guide lithium ions to transport longitudinally or tend to transport longitudinally and deposit uniformly, suppress lithium dendrite growth, and alleviate volume expansion stress during cycling. The lithiophilic layer provides low nucleation overpotential sites, further promoting uniform lithium deposition. Through the synergy of the above layers, uniform lithium deposition can be effectively achieved, and volume expansion stress during cycling can be dispersed and absorbed, significantly improving the cycle performance and safety of the battery.

This invention relates to the field of powder metallurgy high-nitrogen steel preparation technology, specifically a method for optimizing the corrosion resistance of high-nitrogen steel based on powder metallurgy technology. The method includes: pre-treating gas-atomized high-nitrogen steel pre-alloyed powder by inert gas purging, constant-temperature heating for degassing, and mechanical stirring; then physically mixing it with a nano-chromium nitride, vanadium nitride, and niobium nitride composition; during filling, activating a variable-frequency mechanical vibration table to achieve gradient densification filling with a higher density at the bottom of the mold than at the top; after multi-stage vacuum and inert gas circulation, using stepped heating and simultaneous application of axial pressure and isotropic inert gas static pressure to complete solid-state sintering and preliminary densification. This invention, through gradient filling and multi-field coupled sintering process design, improves powder distribution and sintering densification state, reduces microscopic defects in the matrix, optimizes nitrogen element distribution, and enhances the corrosion resistance of high-nitrogen steel. The process has strong adaptability and is suitable for the powder metallurgy preparation of high-nitrogen steel components.

The invention relates to the field of alkaline electrochemical generators, in particular to the field of accumulators. More specifically, the invention relates to a secondary electrochemical generator with a zinc electrode, characterized in that it comprises: a) an electrolyte, which is an aqueous alkaline solution with a molar concentration of 4 M to 15 M of hydroxide anions, and a concentration of soluble silicates, expressed as silicon dioxide (SiO2), of 0.15 to 80 g / l; b) a zinc electrode comprising a conductive ceramic, which at least partially comprises nitrides and / or hafnium carbides and / or carbides and / or magnesium silicides and / or carbides and / or niobium nitrides and / or carbides and / or carbides and / or titanium nitrides and / or vanadium nitrides and / or carbides and / or azides of any two metals selected from the group consisting of hafnium, magnesium, niobium, titanium and vanadium.

The invention relates to a four-layer metal oxide / metal / metal / metal oxide coating that provides multispectral camouflage. Said coating having camouflage characteristics provides thermal, multispectral and electromagnetic protection by offering reflection, absorption and transmission properties against infrared (IR), ultraviolet (UV) and electromagnetic waves. As the ceramic layer, it comprises titanium dioxide (TiO₂), titanium nitride (TiN), zinc oxide (ZnO), zinc nitride (Zn₃N₂), iron (III) oxide (Fe₂O₃), iron (II) oxide (FeO), iron nitride (Fe₂N), aluminium oxide (Al₂O₃), aluminium nitride (AlN), tin oxide (SnO₂), magnesium oxide (MgO), magnesium nitride (Mg₃N₂), calcium oxide (CaO), calcium nitride (Ca₃N₂), cobalt oxide (CoO), tungsten oxide (WO₃), vanadium oxide (V₂O₅), vanadium nitride (VN), manganese oxide (MnO₃), chromium oxide (Cr₂O₃), chromium nitride (CrN), nickel oxide (NiO), boron oxide (B₂O₃), boron nitride (BN) or barium oxide (BaO). As the metal layer, copper (Cu), aluminium (Al), nickel (Ni), cobalt (Co), silver (Ag), gold (Au), iron (Fe), tungsten (W), tin (Sn), zinc (Zn), magnesium (Mg), vanadium (V), chromium (Cr), lead (Pb) or platinum (Pt) is used to provide protection against thermal cameras and UV rays, while electromagnetic waves are blocked. The adhesive-free layered structure is resistant to wear and provides versatile protection for military clothing and mobile platforms by optimising reflection and transmission.

The invention discloses high-strength nodular cast iron and a processing technology thereof, belongs to the technical field of cast iron preparation, and aims to solve the technical problem that the strength and corrosion resistance of nodular cast iron in the prior art need to be further improved. Magnesium-cerium-sulfur oxide microcapsule particles, iron-molybdenum-boron alloy particles and titanium-vanadium nitride composite particles are introduced in the preparation process of the nodular cast iron, so that different material units respectively participate in tissue formation, matrix construction and operation response processes of the nodular cast iron; the prepared nodular cast iron shows stable yield characteristics and lower volume wear and mass loss levels in tests of mechanical properties, wear resistance and corrosion resistance, keeps a more balanced performance state under the conditions of bearing, friction, corrosion and the like, and is suitable for application scenes with higher requirements on comprehensive service performance.

This utility model relates to the field of biosensor technology and discloses a vanadium nitride-enhanced fiber optic SPR sensor. The vanadium nitride-enhanced fiber optic SPR sensor provided includes an optical fiber body with a sensing region formed on the optical fiber body. From the inside to the outside, a gold film layer, a vanadium nitride film layer, and a gold nanoparticle film layer are respectively attached to the surface of the sensing region. By introducing vanadium nanosheets, which have high conductivity, low loss, and high refractive index, a composite structure is formed with noble metal nanoparticles (Au NPs), constructing a "high refractive index medium enhancement-localized surface plasmon resonance synergy" system. This compensates for the energy loss of the metal film, enhances the interaction between the electromagnetic field and the target molecules, and further improves the sensitivity of the sensor.

The application discloses a vanadium-based positive electrode material and a preparation method and application thereof. The vanadium-based positive electrode material comprises a nitrogen-doped carbon matrix, quantum dot-sized vanadium nitride and vanadium trioxide loaded on the nitrogen-doped carbon matrix, a non-homogeneous interface is formed between the nitrogen-doped carbon matrix and the quantum dots, a heterojunction is formed between the quantum dot-sized vanadium nitride and the quantum dot-sized vanadium trioxide, and the nitrogen-doped carbon matrix is formed by calcining melamine. The preparation method comprises the following steps: adding ammonium metavanadate and melamine in a molar ratio of 1:2-4 into a dimethyl sulfoxide aqueous solution, stirring, obtaining a homogeneous solid solution, centrifuging, drying, sintering at 555 DEG C-1555 DEG C for 1h-5h in an inert atmosphere, and naturally cooling to obtain the vanadium-based positive electrode material. The vanadium-based positive electrode material has abundant heterojunctions, the preparation process is simple, the conditions are easy to control, the vanadium-based positive electrode material has long cycle stability, high specific capacity and excellent rate performance when used as a positive electrode of a zinc ion battery, and the zinc ion storage performance is outstanding.

The present invention relates to a carbon composite material for use in a positive electrode of a lithium-sulfur battery, the carbon composite material including a porous carbon material; and vanadium nitride particles formed on a surface of the porous carbon material. A lithium-sulfur battery using the carbon composite material has improved stability by rapidly converting lithium polysulfide into lithium sulfide.

The invention discloses an interface regulation and control method and a preparation method of a high-load porous vanadium nitride-foamed nickel self-supporting flexible supercapacitor electrode material, and belongs to the technical field of capacitors. The self-supporting porous VN electrode is grown on foamed nickel in situ through an extensible interface soaking-nitriding strategy. The structure advantages of the three-dimensional conductive substrate and the porous VN are ingeniously combined, the active substance loading capacity up to 28.10 mg cm <-2 > is achieved, and the excellent surface capacitance performance and the good rate characteristic are shown. Mechanism research shows that rich pore structures and stable interface contact promote ion migration and charge transfer. The flexible asymmetric supercapacitor assembled by taking VN / NF as a negative electrode and ZNCO / NF as a positive electrode shows high energy density and long-term cycling stability. The research provides important material basis and scientific basis for designing a high-performance and high-load electrode for a practical novel energy storage system.

This disclosure relates to polycrystalline cubic boron nitride material with cBN particles in a metal matrix comprising zirconium nitride and / or vanadium nitride precipitates or grains.

The invention relates to the technical field of steel and iron material manufacturing, in particular to normal-pressure high-nitrogen steel and an efficient nitrogen increasing production control method thereof. The method comprises the following steps: electric furnace production, LF refining pretreatment for adjusting the content of other elements except nitrogen and manganese, RH vacuum treatment for adjusting vacuum pressure in the midway to increase the nitrogen content yield, LF treatment for adjusting the content of nitrogen and manganese elements, RH soft blowing and continuous casting for producing the high-nitrogen steel, and has the beneficial effects that the production efficiency is improved, and the use of manganese nitride, vanadium nitride and other alloys is reduced; excessive adding amount and excessive nitrogen content are avoided, the cost is saved, the nitrogen content control hit rate is increased, and the production efficiency is improved.

The application discloses a kind of based on high-temperature stability surface catalytic material's ammonia decomposition hydrogen purification composite membrane and preparation method, the composite membrane includes matrix layer, and catalytic layer is distributed in the surface of matrix layer two sides, the matrix layer is vanadium metal layer, the catalytic layer is vanadium nitride layer.The composite membrane of the application has excellent hydrogen permeation performance and high-temperature durability, and vanadium nitride has the catalytic performance of hydrogen dissociation and hydrogen polymerization comparable with palladium under ammonia decomposition hydrogen production condition, and mutual diffusion does not occur with matrix layer at high temperature above 450 DEG C.In addition, the application is carried out structure regulation on the surface of vanadium metal layer, and the thickness of vanadium nitride catalytic layer can be conveniently grown in situ in matrix, and it is more suitable for large-scale industrial production.

This invention belongs to the field of metallurgical materials and discloses a high-quality vanadium nitride alloy and its preparation method. The method includes the following steps: S1: pressing a square pyramidal raw material block to obtain a raw material block; S2: breaking the raw material block into multiple irregular small blocks, and drying them in a 110℃ oven to constant weight; S3: placing the material in a high-temperature tube furnace and maintaining it in a high-purity nitrogen atmosphere, using a carbothermic reduction nitriding one-step reaction for a set time, first heating to a high-temperature zone, then holding at that temperature, and then naturally cooling down, thus obtaining high-quality vanadium nitride with a nitrogen content higher than 18wt%. This invention, by preparing irregular small blocks, combining the agglomeration method and the reduction method, controlling the size and shape of the material, and controlling various other process conditions to stabilize the nitrogen yield, improves the vanadium-nitrogen microalloying effect, and makes the nitrogen content of the product higher than 18%, possessing excellent properties such as uniform microstructure, stable quality, and high nitrogen content.

The present disclosure relates to methods of forming vanadium nitride-containing layers.SOLUTION: The method comprises providing a substrate in a reaction chamber of a reactor and depositing a vanadium nitride containing layer on a surface of the substrate, wherein the deposition process comprises providing a vanadium precursor to the reaction chamber and providing a nitrogen precursor to the reaction chamber. The present disclosure further relates to structures and devices including vanadium nitride-containing layers.SELECTED DRAWING: Figure 1

The present application belongs to the technical field of electrocatalyst materials, and particularly relates to a preparation method of a vanadium nitride / transition metal monatomic supported electrocatalyst, which comprises the following steps: dissolving a water-soluble transition metal salt, a vanadium source and an alkaline substance in water to form an alkaline aqueous solution; adding a surfactant to the alkaline aqueous solution to prepare a mixed solution; performing a hydrothermal reaction on the mixed solution, and obtaining a vanadium / metal hydroxide powder after the reaction; mixing the vanadium / metal hydroxide powder with a nitrogen-containing carbon source, fully grinding, and performing a heat treatment under a protective atmosphere to obtain the vanadium nitride / transition metal monatomic supported electrocatalyst. The electrocatalyst prepared by the present application presents a morphology structure of nanotubes growing on nanosheets, exposes a large number of sites on the surface, is conducive to the exposure of catalytic active sites, and can fully play a synergistic effect between the morphology and the supported monatomic atoms, which is conducive to improving the overall conductivity of the material, the catalytic activity and the stability of the material.

A secondary battery (5) and its preparation method and power supply device are disclosed. The secondary battery (5) includes a positive electrode, a negative electrode, and a separator (10). The separator (10) is located between the positive electrode and the negative electrode. The separator (10) includes a first polymer layer (101) and a material layer (102) disposed on the first polymer layer (101). The material layer (102) includes inorganic materials, including one or more of lithium aluminum titanium phosphate, lithium aluminum germanium phosphate, lithium aluminum titanium germanium phosphate, lithium aluminum titanium phosphate, lithium aluminum tantalum titanium phosphate, lithium tetrathiophosphate, lithium germanium phosphorus sulfide, lithium phosphorus sulfide, iron oxide, copper oxide, titanium dioxide, tin dioxide, manganese dioxide, zinc oxide, zirconium dioxide, chromium nitride, vanadium nitride, nickel nitride, iron nitride, graphene oxide, graphene oxide, fluorinated graphite, fluorinated graphene, fluorinated carbon nanotubes, and fluorinated carbon fibers. The secondary battery (5) has excellent high-rate cycle performance and a long service life.

A cathodic arc coating system includes alternating layers of at least one of titanium vanadium nitride (TiVN) and titanium silicon vanadium nitride (TiSiVN) disposed on a substrate; and alternating layers of titanium vanadium chromium nitride (TiVCrN) and titanium silicon vanadium nitride (TiSiVCrN) disposed on a substrate. A cathodic arc process includes a sub-hertz variable bias forming the alternating layers of alternating layers of at least one of titanium vanadium nitride (TiVN) and titanium silicon vanadium nitride (TiSiVN) disposed on a substrate; and alternating layers of titanium vanadium chromium nitride (TiVCrN) and titanium silicon vanadium nitride (TiSiVCrN) disposed on a substrate.

The present invention discloses a method for precisely controlling the nitrogen content during the smelting of a high-strength iron-nickel-molybdenum alloy, belonging to the field of metallurgical technology. After the vacuum treatment process in the VD vacuum treatment process is completed, nitrogen is filled into the furnace, and the nitrogen filling pressure is P N2 , and the nitrogen filling pressure P N2 is calculated according to the formula. After the nitrogen filling is completed, vanadium nitride alloy is added, and then the bottom blowing gas is switched to nitrogen, and the nitrogen flow rate is controlled at 50-70 NL / min for 10-15 min, and then the steel is tapped for casting. After the VD vacuum degree treatment in the present invention, under the nitrogen atmosphere condition, nitrogen is increased by adding a nitrogen-containing alloy and bottom blowing nitrogen, and the oxygen and inclusion content in the molten steel are reduced to the greatest extent, and the precise control of the nitrogen content in the high-strength iron-nickel-molybdenum alloy can be realized.

The invention relates to the technical field of metallurgy, and provides a high-wear-resistance roll collar and a preparation method thereof. The high-wear-resistance roll collar comprises a core part and a working layer outside the core part, and the core part is made of graphite steel; the core part consists of the following components in percentage by weight: C, Si, Mn, P, S and the balance of iron and other inevitable impurities; the working layer comprises a matrix and a reinforcing phase, and the mass ratio of the matrix to the reinforcing phase is 100: (5-8); the matrix is composed of the following components in percentage by weight: C, Mo, W, Cr, Ti, Nb, Mn, La, S, P and the balance of iron and other inevitable impurities; the reinforcing phase is composite vanadium nitride; the composite vanadium nitride is vanadium nitride loaded nano powder; the nano powder is titanium powder and nickel powder. By means of the technical scheme, the problem that in the prior art, the wear resistance of the roll collar is insufficient is solved.

The cathodic arc coating system includes at least one alternating layer of titanium vanadium nitride (TiVN) and titanium silicon vanadium nitride (TiSiVN) disposed on a substrate, and at least one alternating layer of titanium vanadium chromium nitride (TiVCrN) and titanium silicon vanadium nitride (TiSiVCrN) disposed on the substrate. The cathodic arc process includes a sub-hertz variable bias that forms at least one alternating layer of titanium vanadium nitride (TiVN) and titanium silicon vanadium nitride (TiSiVN) disposed on the substrate, and at least one alternating layer of titanium vanadium chromium nitride (TiVCrN) and titanium silicon vanadium nitride (TiSiVCrN) disposed on the substrate.

The present application relates to the technical field of synthetic ammonia catalyst, in particular to a cesium-modified cobalt-based vanadium nitride synthetic ammonia catalyst, a preparation method and application thereof. When the cesium-modified cobalt-based vanadium nitride synthetic ammonia catalyst is prepared, cobalt acetylacetonate, vanadium nitride and an organic solvent are mixed, water and cesium nitrate are added, then the solvent of the above mixture is removed to obtain cesium ion promoted cobalt acetylacetonate / vanadium nitride, and the cesium ion promoted cobalt acetylacetonate / vanadium nitride is heat treated in a hydrogen atmosphere to obtain the cesium-modified cobalt-based vanadium nitride synthetic ammonia catalyst Cs-Co / VN. The cesium-modified cobalt-based vanadium nitride synthetic ammonia catalyst Cs-Co / VN prepared by the method can reduce the reaction activation energy required in the ammonia synthesis process to 48 kJ / mol.

The application relates to the technical field of steel materials, in particular to a high-wear-resistance steel material for a pipe mold and a preparation process thereof, which comprises the following preparation steps: step S1: smelting, step S2: casting and heat treatment, and step S3: preparation of the high-wear-resistance steel material for the pipe mold. In the smelting process, an inoculation modifier composed of an Al-Ti-Nb intermediate alloy and a vanadium iron nitride alloy is used, the Al-Ti-Nb intermediate alloy and the vanadium iron nitride alloy can play a mutual synergistic effect, and the strength and toughness of the steel material body can be improved; through high-temperature solid solution treatment at 1030-1040 DEG C and twice tempering treatment at 540-560 DEG C, the toughness of the steel material body is optimized on the basis of maintaining high hardness, the balance between hardness and toughness is realized; in the preparation process of the high-wear-resistance steel material for the pipe mold, laser cladding material mixed by AlCoCrNiTiB alloy powder and nano ytterbium oxide powder is used to perform surface modification on the steel material body, so that the high-wear-resistance steel material for the pipe mold simultaneously has the characteristics of low friction and wear resistance.

The invention relates to the technical field of alloy additives, and discloses a high-heat-resistance and corrosion-resistance vanadium-based composite additive and a preparation method thereof.The vanadium-based composite additive comprises, by mass, 25-35 parts of nano vanadium powder, 15-22 parts of vanadium-titanium alloy powder, 8-15 parts of vanadium nitride, 3-8 parts of cerium dioxide, 4-9 parts of a corrosion-resistance regulating agent and 16-25 parts of aluminum-zirconium alloy powder, the nano vanadium powder is modified, and the aluminum-zirconium alloy powder is modified. The anti-corrosion regulating agent is a composite system of zinc phosphate and lanthanum oxide. According to the invention, the formula defect of single vanadium powder in the prior art is abandoned, a quaternary collaborative core system (V-VTi30-VN-CeO2 quaternary system) is constructed according to the core requirements of heat resistance, corrosion resistance, toughening, molding and the like of aluminum alloy modification, and the effects of strengthening without sacrificing corrosion resistance and without weakening mechanical properties are realized; the problems that an existing aluminum alloy is prone to brittle fracture, corrosion failure, rapid performance attenuation and the like under the complex working conditions of high-low temperature circulation, high-temperature corrosion and the like are solved.