81 results about "Vanadium carbide" patented technology

The invention provides a polysilazane green special refractory ceramic coating and a preparation method thereof, and belongs to the field of ceramic coatings. The ternary core material composed of titanium carbide, zirconium boride and silicon nitride provides high hardness, oxidation resistance, thermal shock resistance and excellent thermal stability; the silicon dioxide-aluminum oxide composite shell layer remarkably improves the oxidation resistance and reliability of the coating through the synergistic oxidation resistance and crack self-repairing function; the multi-metal oxygen cluster network endows the coating with excellent electrical conductivity, thermal conductivity and corrosion resistance; the intercalated montmorillonite enhances the crack resistance and oxidation resistance through a layered structure and embedded active ions; and the boron nitride coated vanadium carbide particles provide lubricity, oxidation resistance and wear resistance. Through collaborative optimization of multiple components, the comprehensive performance of the coating is comprehensively improved in the aspects of oxidation resistance, thermal conductivity, interface stability, high-temperature performance, mechanical performance and the like, so that the coating shows excellent long-term stability and functionality in an extreme environment.

The invention discloses a preparation method of a superfine WC-Co hard alloy. 89.8-90% wt of superfine tungsten carbide, 9% wt of superfine Co powder and 1-1.2% wt of composite additive chromium carbide and vanadium carbide are adopted; wherein the weight ratio of chromium carbide to vanadium carbide is 1 / 2; ball-milling the raw materials to obtain a mixture; and the pressed blank is subjected to a specific oscillation pressure and rapid cooling sintering process, the contact form and interface state among particles are improved, the density of the hard alloy is improved, WC grain growth is inhibited, flowing of binding phase Co is promoted, the structure and mechanical properties of the alloy are remarkably improved, and the nanocrystalline WC-Co hard alloy with high strength and high density is obtained.

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 application discloses a kind of hard alloy cutter materials for deep hole machining, the cutter material is composed of the following weight percentage components: tungsten carbide: 75%~85%, wherein 0.2~0.4 μm superfine tungsten carbide particles account for 60%~80%, 0.4~0.8 μm tungsten carbide particles account for 20%~40%; Cobalt: 10%~15% titanium carbide: 2%~5%; Tantalum carbide: 1%~3%; Niobium carbide: 0.5%~2%; Vanadium carbide: 0.3%~1.0%; Chromium carbide: 0.2%~0.8%; Rare earth element: Y2O3 Or La2O3: 0.1%~0.5%. The application breaks through the bottleneck of high temperature wear, insufficient strength and short service life of traditional hard alloy in deep hole machining through three-dimensional innovation of component design, structure control and surface strengthening, and provides an efficient solution for precision deep hole machining of high hardness materials.

This invention relates to the field of metal matrix composite material preparation technology, and discloses a method for preparing a bundled vanadium carbide reinforced steel matrix composite material, comprising: immersing vanadium wire in a pretreatment chemical isolation liquid and drying it to form a precursor solid film on the surface; fabricating a preform from the vanadium wire with the solid film on the surface using a three-dimensional orthogonal weaving process; placing the preform in a vacuum sintering furnace and heating it to complete solid-phase pre-alloying; fixing the preform in a mold and preheating it under a protective atmosphere; melting a high-carbon steel matrix material until it is completely liquefied, injecting it into the mold to immerse the preform, and cooling it to obtain a composite preform block; subjecting the composite preform block to in-situ reaction diffusion heat treatment to obtain the composite material. This invention prevents the thermal loss of vanadium wire during liquid casting and, through in-situ diffusion reaction, allows the generated vanadium carbide to inherit the initial weaving morphology, achieving a three-dimensional bundled uniform distribution of the reinforcing phase within the steel matrix.

The invention discloses blast furnace stemming and a preparation method thereof. The invention discloses a high-temperature-resistant wear-resistant coating which is characterized by comprising the following components in parts by weight: 380-420 parts of brown aluminum oxide, 70-90 parts of a carburant, 50-70 parts of Guangxi white mud, 110-150 parts of silicon carbide, 15-30 parts of asphalt powder, 5-30 parts of vanadium carbide or chromium carbide or a mixture of vanadium carbide and chromium carbide or pore-forming vanadium chromium carbide and 50-100 parts of liquid resin. The blast furnace stemming disclosed by the invention has relatively high high-temperature breaking strength, normal-temperature compression strength and normal-temperature breaking strength, and excellent slag and molten iron erosion resistance and molten iron scouring resistance.

The present invention provides a low-oxygen vanadium carbide and a method for producing the same, which is formed by reducing the oxygen content, mixing vanadium oxide and a carbon compound, then refining the particle size by high-energy milling using a high-energy milling apparatus, followed by vacuum heat treatment and a carbonization reduction reaction.

The invention relates to a preparation method of a ternary two-dimensional layered heterojunction and application of the ternary two-dimensional layered heterojunction to a rechargeable zinc battery and a sodium battery, a vanadium-based MAX phase and halide salt are used as precursors, a two-dimensional layered vanadium carbide / vanadium trioxide heterojunction is prepared through a melting solid-liquid reaction, the two-dimensional layered vanadium carbide / vanadium trioxide heterojunction is used as a precursor, zinc acetate is used as a metal ion source, adenine and 4, 4 '-diphenyltetracarboxylic acid are used as a metal ion source, and the ternary two-dimensional layered heterojunction is prepared. The ternary two-dimensional vanadium carbide / vanadium trioxide / biological metal organic framework layered heterojunction with three components is obtained through solvothermal reaction by taking 4, 4 '-biphenyldicarboxylic acid as an organic ligand and concentrated nitric acid as a pore structure regulating agent, and the specific capacities of the ternary two-dimensional vanadium carbide / vanadium trioxide / biological metal organic framework layered heterojunction are respectively higher than 220 mAh g <-1 > and 200 mAh g <-1 > when the ternary two-dimensional vanadium carbide / vanadium trioxide / biological metal organic framework layered heterojunction is used as a positive electrode material of a rechargeable aqueous zinc ion battery and a rechargeable sodium metal battery. The rate capability is excellent, and the cycle performance is good. The controllable preparation of the ternary two-dimensional layered heterojunction is realized by starting from the easily obtained MAX phase and halide salt through a process with high repeatability, simple process and less time consumption, and the method is suitable for industrial production.

The present invention belongs to the field of surfacing welding, and specifically relates to an alloy material for surfacing welding, a surfacing welding method, and a mechanical part. The chemical composition of the surfacing welding alloy material is, by weight percentage, C: 0.7-1.4, Si: 0.9-1.3, Mn: 1.5-2.5, Cr: 12-16, W: 1.5-3.0, V: 1.5-3.0, and the balance is iron. By combining a C content of 0.7wt% to 1.4wt%, a W content of 1.5wt% to 3.0wt%, and a V content of 1.5wt% to 3.0wt%, sufficient tungsten carbide and vanadium carbide hard phases in a finely dispersed distribution are provided while simultaneously refining the grains. This improves the hardness and wear resistance of the surfacing alloy layer, and suppresses low-temperature temper brittleness, thereby preventing the continuous precipitation of carbides between grains and the thermal expansion difference between grains from synergistically generating strong internal stress, suppressing the generation and expansion of cracks, and improving the corrosion resistance of the surfacing alloy layer.

The invention discloses a preparation method and device of a gradient structure tungsten carbide-cobalt composite grinding ball for a ball mill, and relates to the technical field of grinding ball preparation. Firstly, tungsten carbide powder, cobalt powder, vanadium carbide powder, chromium carbide powder and stearic acid are mixed and subjected to ball milling; carrying out layered powder filling and isostatic pressing to prepare a green body, carrying out liquid-phase sintering in a vacuum furnace, and introducing hydrogen to prevent decarburization; and then carrying out ultrasonic treatment with cerium nitrate and ammonium molybdate solutions, then carrying out hot pressing to strengthen the surface, and finally regulating and controlling stress through quenching and tempering to prepare the gradient structure grinding ball which has a hard outer layer and a tough inner layer and has high wear resistance and impact toughness. Through gradient structure design, multi-element compounding and precise process control, the outer layer of the grinding ball is wear-resistant, the inner layer is impact-resistant, the wear resistance is improved, the impact toughness is improved, the service life is prolonged, the production cost is reduced, and the grinding ball is suitable for industrial production.

The invention belongs to the technical field of electro-catalytic hydrogen evolution, and particularly relates to a metal type cobalt-vanadium carbide heterostructure composite material and a preparation method and application thereof. The method comprises the following steps: dissolving Zn (NO3) 2.6 H2O and Co (NO3) 2.6 H2O in methanol, then adding a 2-methylimidazole methanol solution, uniformly stirring, continuously adding a methanol / water mixed solution containing MXene sol, stirring for reaction, washing, drying to obtain a precursor, and finally putting the precursor in a mixed atmosphere for high-temperature pyrolysis and cooling to obtain the composite electrocatalytic material. According to the method, MOF is adopted for in-situ assembly on the surface of two-dimensional V2C MXene, the composition and structure of a precursor can be effectively controlled, uniform dispersion of a cobalt-vanadium carbide heterostructure in the mesoporous carbon sheet is achieved, and the problems that traditional metal nanoparticles are prone to agglomeration, uneven in distribution and the like are solved. In addition, the synthesis process is simple, convenient and controllable, does not need complex post-treatment or multi-step calcination process, and is suitable for large-scale production.

The invention is directed to a wear resistant vanadium alloyed powder metallurgy produced cold work tool steel for knives consisting of in weight % (wt.%): 2.2 - 2.4 C; 0.1 - 0.55 Si; 0.2 - 0.8 Mn; 4.1 - 5.1 Cr; 3.1 - 4.5 Mo; 7.2 - 8.5 V optional components and impurities balance Fe, wherein the cold work tool steel after hardening does not contain more than 1 volume % of carbides larger than 1 pm other than vanadium carbides and wherein at least 25 % of the vanadium carbides have a size of 3 pm and / or wherein the vanadium carbides are near spherical and at least 55 of the number of the vanadium carbides has an aspect ratio ≤ 1.5. The invention is also directed to a method of producing said steel and the use of said steel.

The present disclosure provides Max and MXene using low-cost vanadium carbide instead of an expensive vanadium metal, and a method for preparing same.

The invention provides a hard alloy material for an optical mold, a preparation method of the hard alloy material and a near-net forming preparation method of the optical mold. The hard alloy material for the optical mold is formed by mixing 90-93 wt.% of tungsten carbide powder, 90-93 wt.% of vanadium carbide powder and 100 wt.% of silicon nitride powder and then carrying out SPS (spark plasma sintering) on the mixture, and the content of the tungsten carbide powder, the vanadium carbide powder and the silicon nitride powder is 100 wt.% of the total weight of the material. The content of the vanadium carbide is 0.95 wt.% to 1.05 wt.%; and the balance being silicon nitride. The hard alloy material has certain hardness and strength, the thermal expansion coefficient can be matched with the mold core material, the eccentricity of the aspheric lens and the lens assembly yield are effectively improved, the problems that materials are wasted and the machining period is prolonged due to a cake material prepared through a traditional spark plasma sintering technology are solved, and the yield of the optical mold is effectively improved.

The application discloses an alloy material and a preparation method and a mold thereof. The alloy material comprises tungsten carbide, a binder phase, tantalum carbide, chromium, and a carbon compound, wherein the carbon compound comprises at least one of titanium carbide, niobium carbide and vanadium carbide. The mold prepared from the alloy material can be used for preparing lithium battery tabs. The material has good wear resistance, and is not prone to wear, corner collapse, fatigue cracks and the like in high-frequency and high-impact tab stamping operations, so that the service life of the mold is long, and the production continuity and tab forming precision are not affected.

The present application belongs to the technical field of hard alloy material, and particularly relates to a hard alloy for hard rock tooth and a preparation method thereof. The method comprises the following steps: mixing coarse tungsten carbide powder, submicron tungsten carbide powder, cobalt powder, nickel powder, chromium carbide powder, vanadium carbide powder, tantalum carbide powder, niobium carbide powder, dimolybdenum carbide powder, graphite powder, tantalum-niobium-zirconium composite carbide solid solution pinning body and yttrium-doped cerium oxide toughening control body, ball milling, drying, crushing, sieving, granulating, die pressing, cold isostatic pressing, degreasing, vacuum sintering, hot isostatic pressing treatment, grinding, cleaning and drying. The present application can inhibit grain growth by multiple carbides, and can improve the grain boundary and binder phase distribution by using rare earth oxides, so that the obtained hard alloy has good wear resistance, impact resistance and anti-chipping performance, and is suitable for hard rock tooth.

The invention belongs to the field of metal materials, and provides a multi-element hard alloy wear-resisting ball and application of the multi-element hard alloy wear-resisting ball in the heavy industry. Through gradient design of a chromium-rich / molybdenum-rich nano precipitated phase reinforced binding phase, a vanadium carbide and graphite core-shell modified tungsten carbide hard phase, outer-layer low-binding-phase fine grains and inner-core high-binding-phase coarse grains, synergy of high hardness and wear resistance of the outer layer and high toughness and fragmentation resistance of the inner core is realized; the problems that high-hardness wear resistance and low-friction self-lubricating of an existing ball-milling medium are difficult to consider, gradient structure residual stress and interface defect sensitivity are high, and a high-density non-sheath hot isostatic pressing process window is extremely narrow are solved, the wear-resisting ball has the excellent performance that the Vickers hardness HV is 1200-1600, the compressive strength is 4000-6000 MPa, and the density is 14.0-15.3 g / cm < 3 >, and the wear-resisting performance of the wear-resisting ball is greatly improved. The method has wide application value in grinding media of ore ball mills or semi-autogenous mills.

The present invention provides a low-oxygen vanadium carbide and a preparation method therefor, the low-oxygen vanadium carbide having reduced oxygen content and being formed by mixing a vanadium oxide with a carbon compound, and then refining the particle size thereof by means of high-energy milling by using a high-energy milling apparatus, and carbonizing and reducing same by means of a vacuum heat treatment.

The application discloses a kind of corrosion-resistant alloy steel van body and preparation method, belong to van body technical field, first by to van body blank is carried out normalizing, quenching, tempering treatment after obtaining van body semi-finished product, again to van body semi-finished product is sequentially using picosecond laser and nanometer laser and is etched, after anodic oxidation treatment form porous and uniform oxide layer, by laser cladding method uniform vanadium carbide, titanium carbide coating is formed on surface, the porous structure of oxide film can improve the adhesion of subsequent coating, form oxide film plus coating composite protection system, increase the corrosion resistance of corrosion-resistant alloy steel van body, prolong the service life of corrosion-resistant alloy steel van body in slurry pump.

Provided is a vanadium carbide containing an oxygen content of 4,000 ppm or less and a carbon content of less than 15 wt %, where a crystalline system of the vanadium carbide exhibits a combination of a trigonal system and a cubic system, which facilitates the process for manufacturing MAX and MXene excluding the expensive vanadium metal.

The present application provides a positive electrode active material, which includes at least one sheet structure, the sheet structure includes a plurality of particles, the particles include a composite and a carbon layer encapsulating the composite, the composite including vanadium trioxide and vanadium carbide. The heterogeneous structure formed by vanadium trioxide and vanadium carbide accelerates the electron and ion transport within the particles, the construction of vanadium carbide and carbon layer can also significantly improve the conductivity, and the sheet structure also shortens the ion transport path, thereby obtaining a positive electrode active material with excellent rate performance, high reversible capacity and long cycle life. The present application also provides a preparation method and application of the positive electrode active material.

The present invention provides a polysilazane-based green special refractory ceramic coating and a preparation method thereof, belonging to the field of ceramic coatings. The present invention provides high hardness, oxidation resistance, thermal shock resistance and excellent thermal stability with a ternary core material composed of titanium carbide, zirconium boride and silicon nitride; the silica-alumina composite shell layer significantly improves the oxidation resistance and reliability of the coating through synergistic oxidation resistance and crack self-repairing functions; the polymetallic oxygen cluster network gives the coating excellent electrical conductivity, thermal conductivity and corrosion resistance; the intercalated montmorillonite enhances the crack resistance and oxidation resistance through the layered structure and embedded active ions; the boron nitride-coated vanadium carbide particles provide lubricity, oxidation resistance and wear resistance. The synergistic optimization between multiple components comprehensively improves the comprehensive performance of the coating in terms of oxidation resistance, thermal conductivity, interface stability, high temperature performance and mechanical properties, so that it exhibits excellent long-term stability and functionality in extreme environments.

The present application relates to the technical field of alloy, in particular to a kind of hard alloy rod based on regenerated tungsten carbide powder and preparation method thereof.The rod is prepared from carbon shell regenerated tungsten carbide powder, cobalt powder, vanadium carbide powder and tricarbide chromium powder by low-energy mixing, dense mixing extrusion, dewaxing sintering and fine grinding.The carbon shell regenerated tungsten carbide powder is obtained by sequentially forming first polydopamine sublayer containing urea, second polydopamine sublayer and resorcinol-formaldehyde resin outer layer on the surface of regenerated tungsten carbide particles, and then pre-pyrolysis by argon.The hierarchical carbon shell is used to compensate the carbon-oxygen fluctuation on the surface of regenerated tungsten carbide particles during sintering process, so that the obtained rod has fine and uniform tungsten carbide grains, lower hardness dispersion, higher transverse breaking strength and lower micro-drill edge collapse rate.

The invention belongs to the field of polycrystalline diamond compacts, and particularly relates to a diamond blade capable of machining a high-quality cutting edge. The preparation method of the diamond blade comprises the following steps: (1) uniformly mixing diamond micro-powder with the particle size of not more than 2 microns and vanadium carbide to obtain mixed powder; and (2) the mixed powder and a hard alloy substrate are assembled and then subjected to high-temperature and high-pressure sintering, gathering of diamond particles is hindered through vanadium carbide, the distribution uniformity of the diamond particles and adhesives among the diamond particles is improved, and the diamond blade capable of machining a high-quality cutting edge is obtained. According to the method, the small-particle-size diamond micro powder and the vanadium carbide are selected for mixing, the particle size of diamond particles is reduced, the distribution uniformity of an adhesive is improved, and therefore the number and the size of notches are reduced, and the size of the notches can reach 0.01 mm or below.

The invention relates to a carbon-carbon composite material loaded vanadium carbide and bismuth vanadate self-supporting photoelectrocatalysis electrode and a method and application, and belongs to the technical field of photoelectrocatalysis materials.The method comprises the steps that vanadium carbide powder and bismuth vanadate powder are dispersed in isopropanol and polyacrylic acid respectively, then elemental iodine is added, the mixture is mixed to be uniform, and a corresponding mixed solution is obtained; a carbon-carbon composite material is used as a substrate, vanadium carbide and bismuth vanadate are sequentially deposited under 5-10 V and then dried, bismuth vanadate and vanadium carbide are deposited, then drying and etching are sequentially conducted, the mass ratio of vanadium carbide to bismuth vanadate is (0.34-1.02): (0.34-1.02), and the vanadium carbide / bismuth vanadate photoelectrocatalytic photo-anode and photo-cathode are obtained. The efficient and stable photoelectrocatalysis full water splitting performance under the neutral condition can be realized.

According to the laser cladding-composite casting integrated forming process for the wear-resistant bucket tooth for the super-large excavator bucket and the wear-resistant bucket tooth, laser cladding and casting technologies are adopted for collaborative manufacturing, and laser power is adopted for cladding iron-based alloy powder containing molybdenum boride / vanadium carbide / titanium nitride composite ceramic particles layer by layer, so that a surface micro-texture wear-resistant layer is formed. A dovetail groove array is innovatively designed on the back face of the base plate, a gradient preheating process is matched, an aluminum oxide hollow ball thermal buffer medium is added in a resin sand casting mold, and interface metallurgical bonding is achieved through molten steel pouring. And the interface oxygen content is smaller than or equal to 0.01 wt% by adopting rare earth scaling powder, quenching-tempering heat treatment is combined, and finally the wear-resistant bucket tooth with the tooth top surface hardness being 1400-1800 HV, the matrix hardness being 300-400 HV and the interface bonding strength being larger than or equal to 500 MPa is prepared. The technology effectively solves the technical problems that a traditional bucket tooth is insufficient in wear resistance and an interface is easy to strip through cladding layer superhard ceramic phase strengthening and casting matrix toughness optimization, and is suitable for manufacturing wear-resistant parts of large engineering machinery.

This application provides a method for toughening high-strength steel based on the synergistic effect of residual ferrite and vanadium carbides, comprising the following steps: S1: vanadium carbide dissolution treatment; S2: multi-morphology carbide formation treatment; S3: sub-temperature austenitizing heating and holding treatment; S4: multi-type bainite controlled cooling treatment; S5: austenite undecomposed tempering treatment. This application, through the synergistic effect of the formation of multi-morphology vanadium carbides in S1, the residual undissolved ferrite in S2, and the formation of multi-morphology bainite in S3, can significantly improve the impact toughness of steel workpieces without reducing or slightly reducing their strength.

This application relates to the technical field of aluminum alloys, and in particular to a high-strength electrical aluminum alloy and its smelting process. The aluminum alloy comprises an aluminum alloy matrix and a grain inhibitor. The amount of grain inhibitor added is 0.08-0.16% of the weight of the aluminum alloy matrix. The weight percentage of each chemical component of the aluminum alloy matrix is ​​as follows: Fe 0.6-0.85%, Mg 0.7-0.9%, Si 0.05-0.09%, Cu 0.3-0.5%, Re 0.12-0.22%, B 0.02-0.06%, with the balance being Al. The grain inhibitor is prepared by treating a metal carbide mixture with a cationic surfactant, loading graphene oxide, and then reducing the graphene oxide with hydrazine hydrate. The metal carbide mixture is a mixture of titanium carbide, vanadium carbide, and tantalum carbide. It has the advantages of improving the electrical conductivity and strength of the electrical aluminum alloy.

A method is provided for densifying a ceramic matrix composite (CMC) preform in which a porous CMC preform is subjected to slurry infiltration wherein metal carbide particulate material is introduced into the spaces between fiber tows of the CMC preform to form an infiltrated CMC preform. Thereafter, molten metal or molten metal alloy is introduced into the infiltrated CMC preform by melt infiltration to react the metal or molten metal alloy with the metal carbide particulate material and create a ceramic matrix within the CMC preform forming a ceramic matrix composite. The metal carbide particulate material is selected from zirconium carbide particles, hafnium carbide particles, tantalum carbide particles, niobium carbide particles, titanium carbide particles, tungsten carbide particles, cobalt carbide particles, vanadium carbide particles, chromium carbide particles, ytterbium carbide particles, yttrium carbide particles, tantalum hafnium carbide particles, and mixtures thereof.

The invention relates to the technical field of drill bit materials, in particular to a special wear-resistant powder taper-shank crown drill for high-hardness materials. According to the special wear-resistant powder taper shank crown drill for the high-hardness material, tungsten carbide and cobalt powder serve as matrixes, tantalum carbide, vanadium carbide and titanium-cobalt-nitrogen doped graphene composite powder are added to serve as reinforcing phases, and the special wear-resistant powder taper shank crown drill is prepared through ball-milling mixing, spray granulation, isostatic pressing forming and gradient sintering. Wherein the titanium-doped graphene composite powder is constructed by adopting a polymer P123 template method, titanium dioxide nanoparticles and graphene form a sandwich structure through high-temperature calcination, and the interface bonding strength can be remarkably improved. The special wear-resistant powder taper-shank crown drill for the high-hardness material has high hardness, high fracture toughness, excellent wear resistance and long cutting life, and is particularly suitable for efficient precision machining of high-hardness materials such as titanium alloy and high-temperature alloy.