11 results about "Vanadium carbide" patented technology

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 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 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 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.

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 invention discloses a method for preparing high-density cobalt-free nano-tungsten carbide cemented carbide, belonging to the field of cemented carbide technology. The preparation method includes the following steps: aluminum powder, copper powder, manganese powder, molybdenum powder, and titanium powder are mixed and then subjected to a first ball milling process to obtain high-entropy alloy powder; nano-tungsten carbide powder, high-entropy alloy powder, tantalum carbide powder, vanadium carbide powder, carbon nanotubes, lanthanum oxide, and yttrium oxide are mixed and then subjected to a second ball milling process to obtain composite powder; paraffin wax, stearic acid, ethylene-vinyl acetate copolymer, and low-density polyethylene are mixed to obtain a binder; the composite powder and binder are kneaded to obtain a compound; the compound is extruded to obtain a green body; the green body is subsequently subjected to solvent degreasing and hot degreasing treatments to obtain a degreased green body; the degreased green body is rapidly hot-pressed and sintered to obtain the high-density cobalt-free nano-tungsten carbide cemented carbide. Through the above scheme, this invention prepares a high-density cobalt-free nano-tungsten carbide cemented carbide with good density, hardness, and oxidation resistance.

The present application relates to the technical field of alloy, in particular to a high-strength, impact-resistant hard alloy cold heading die preparation method. It aims to improve the anti-chipping and anti-radial cracking ability of the die lip and the working zone under high impact cold heading conditions. The die includes an outer working zone surrounding the die cavity and located in the corresponding area of the lip and the working zone, and a core bearing zone located outside the outer working zone, both of which are sintered integrally. The outer working zone adopts a tungsten carbide nano / micro powder compound system, through two-stage cobalt-containing precursor coating, and introduces ionic cerium source and particulate cerium source at different solid contents in sections, and adjusts the grain and binder phase distribution with vanadium carbide; the core bearing zone adopts a tungsten carbide micro powder-cobalt powder system. The die is prepared by partitioning die pressing, dewaxing, liquid phase sintering and argon pressure sintering, and is suitable for high load and high frequency cold heading forming.

The application discloses a vanadium carbide nano material capable of enhancing photothermal therapy and application thereof, and relates to the technical field of biomedical materials. The vanadium carbide nano material comprises vanadium carbide nanosheets and cell membrane vesicles. The vanadium carbide nano material is coated with V2C nanosheets through engineering of tumor cell membrane vesicles, target delivery is realized, and the photothermal therapy effect is significantly enhanced by utilizing the characteristic of vanadium elements to block the HSF1 phase separation process. The vanadium carbide nano material integrates multiple functions such as target delivery, photothermal conversion, oxidative stress induction and HSF1 phase separation inhibition, and effectively overcomes the heat tolerance of tumor cells.

This invention relates to the field of rail manufacturing technology, and proposes a method for producing bainitic rails with fatigue resistance. The method includes: heating and rolling a steel billet with a target composition into a rail, wherein the steel billet with the target composition comprises, by mass percentage: 0.20~0.35% C, 1.4~1.80% Si, 1.50~2.20% Mn, and 0.80~1.50% Cr, and simultaneously contains 0.20~0.70% Ni and 0.03~0.12% Ni. The steel rail comprises % V, 0.0005%~0.637% alloying elements selected from one or more of Mo, Ti, Nb, B, and Al, with the balance being Fe and unavoidable impurities. Controlled cooling after rolling ensures the rail obtains a bainitic structure within the bainitic transformation temperature range. During cooling, deformation treatment is applied to the rail within this range to induce vanadium carbide precipitation and stabilize the structure. Subsequently, cooling to room temperature yields a bainitic rail with fatigue resistance. This invention enables the short-process, high-efficiency industrial production of fatigue-resistant bainitic rails at a relatively economical alloy cost.

The application belongs to the technical field of hard alloy, and particularly relates to a high-cobalt superfine hard alloy and a preparation method thereof. The preparation method comprises the following steps: S1, obtaining tungsten carbide powder, cobalt powder, vanadium carbide powder and chromium carbide powder, performing first ultrasonic cell disruption on the tungsten carbide powder to obtain first mixed material, performing second ultrasonic cell disruption on the vanadium carbide powder to obtain second mixed material, and adding the second mixed material into the first mixed material to perform third ultrasonic cell disruption to obtain third mixed material; performing centrifugal spraying on the third mixed material to obtain WC-VC composite powder; S2, performing first ball milling on the cobalt powder and the chromium carbide powder to obtain first slurry; performing second ball milling on the WC-VC composite powder to obtain second slurry; adding the first slurry into the second slurry to perform third ball milling to obtain third slurry; S3, performing drying, pressing and sintering on the third slurry to obtain the high-cobalt superfine hard alloy. The high-cobalt superfine hard alloy with excellent performance is prepared through VC coating and Cr3C2 pre-solid solution.