186 results about "Tungsten carbide" patented technology

The application discloses a preparation method of a high-wear-resistance railway turnout coating and relates to the technical field of railway turnout coatings. A surface grafted modified nano tungsten carbide reinforcing phase is formed; a nano composite pre-alloy powder is obtained; a spherical high-entropy alloy composite spraying powder with high fluidity is obtained; a rough anchoring surface with a micron-level staggered grid structure is constructed on the surface of a base material; a base coating substrate with a thermal expansion gradient buffer feature is obtained; an initial cladding coating workpiece is obtained; and the high-wear-resistance railway turnout coating is prepared. The application excludes closed pores in the powder, and significantly improves the density and fluidity of the powder.

The application belongs to the technical field of metallurgy, and particularly relates to medium-granularity tungsten carbide powder and a preparation method and application thereof. The preparation method comprises the following steps: S1, obtaining high-purity ammonium paratungstate, and calcining the high-purity ammonium paratungstate to obtain tungsten oxide, wherein K in the high-purity ammonium paratungstate is less than or equal to 1 ppm, Na in the high-purity ammonium paratungstate is less than or equal to 1 ppm, and the specific surface area of the tungsten oxide is 0.3-1.0 m 2 / g; S2, first hydrogen reduction, second hydrogen reduction and third hydrogen reduction are performed on the tungsten oxide to obtain tungsten powder; S3, the tungsten powder is sieved and carbon is added to obtain a tungsten-carbon mixture, carbonization, crushing and sieving are performed on the tungsten-carbon mixture to obtain medium-granularity tungsten carbide powder. The application selects high-purity ammonium paratungstate with less than 1 ppm of impurity elements such as potassium and sodium as raw material, which can effectively reduce abnormal growth of tungsten powder particles caused by impurity elements in the reduction process, tungsten powder particles are developed completely by adopting three-stage hydrogen reduction, the powder activity is low, and the particle size increase is small in the subsequent carbonization process.

The application discloses a ball milling method for electrolytically treated tungsten-containing hard alloy, and aims to solve the problems of large dust in dry ball milling process and large difference in physical and chemical indexes of recycled tungsten carbide powder. The ball milling method comprises the following steps: washing electrolytically treated tungsten-containing hard alloy blocks in pure water, then putting the washed tungsten-containing hard alloy blocks into a ball mill for wet ball milling, drying, and obtaining coarse tungsten carbide powder; reducing the coarse tungsten carbide powder at high temperature in an inert atmosphere; and airflow milling the high-temperature reduced coarse tungsten carbide powder to obtain tungsten carbide powder. The ball milling method for electrolytically treated tungsten-containing hard alloy provided by the application reduces the dust generation in the ball milling process by adopting the wet ball milling technology, combining with the optimized ball-to-material ratio, ball milling speed, ball milling time and solid content, and improves the working environment on site. By controlling the drying temperature, time and water content, and optimizing the reduction and airflow milling steps, the final product can have high purity, fine particle size and uniform particle size distribution, and the quality of the product is improved.

The present application relates to the technical field of hard alloy, in particular to a high wear-resistant and excellent anti-skid hard alloy stud and a preparation method thereof. In view of the early failure problem of the existing WC-Co stud caused by cobalt phase pool, uneven interface wetting and nail tip rounding under the alternating impact of ice-water-sand, the tungsten carbide powder is surface modified in dopamine-acrylic acid weak acid aerobic buffer solution, then five ethoxy tantalum and oxalic acid tantalum aqueous solution are introduced in sequence, the double tantalum precursor space preset structure is formed through coordination anchoring, aging and carboxyl adsorption, and then the structure is compounded with cobalt precursor and carbon black, and then the structure is pressed and sintered in sections, so that cobalt is preferentially limited in the interface area of tungsten carbide particles and a tantalum-rich carbide hardening layer is generated; the obtained stud can maintain high wear resistance while significantly inhibiting early rounding and micro-chipping, and has excellent grip stability on ice and wet road surface.

The utility model discloses a kind of high-temperature resistant excitation platform of direct-reading spectrometer, including workbench, fixed cushion block, excitation platform, cooling system, steel sample pressure solid device, laser transmitter and steel sample, excitation platform includes tungsten carbide component and laser hole, laser hole is set in tungsten carbide component middle, tungsten carbide component is set on excitation platform upper end, fixed cushion block is set on workbench, excitation platform lower end is connected with fixed cushion block upper end, steel sample pressure solid device is set on fixed cushion block, cooling system one end is connected with spectrometer, cooling system other end is set and is connected with excitation platform inside, laser transmitter one end is set on workbench, laser transmitter other end passes through steel sample pressure solid device and excitation platform and is close to laser hole upper end, steel sample is placed on tungsten carbide component and covers laser hole, steel sample pressure solid device includes hydraulic rod, and hydraulic rod lower end is pressed on steel sample. Tungsten carbide component is smooth and even and does not deform on the surface of excitation platform under the equipment height operation, avoid light leakage in excitation process to influence detection data.

This invention provides nano-tungsten carbide and its preparation method. The preparation method includes: providing ammonium paratungstate; calcining the ammonium paratungstate to form purple tungsten; oxidizing the purple tungsten in pure oxygen to form yellow tungsten; ball milling the yellow tungsten with carbon, then isostatically pressing it into a block, followed by carbon reduction to obtain a tungsten-carbon mixed block; carbonizing the tungsten-carbon mixed block, and then crushing it to obtain nano-tungsten carbide powder. This invention can reduce the manufacturing cost of nano-tungsten carbide and is beneficial for preparing finer tungsten carbide powder.

The present disclosure provides a screw rod and a screw rod nut assembly, the screw rod comprising: a screw rod body, the screw rod body comprising a threaded section, an outer surface of the threaded section sequentially provided from inside to outside with: a metal chromium base bonding layer, a tungsten carbide hardness support layer, and a DLC functional layer, the DLC functional layer being a diamond-like carbon coating layer; wherein a total thickness T1 of the metal chromium base bonding layer and the tungsten carbide hardness support layer is not less than 0.5 microns, and a thickness T2 of the DLC functional layer is not less than 1.5 microns. The screw rod nut assembly of the present disclosure comprises the above-mentioned screw rod.

The utility model relates to a kind of tungsten carbide alloy high-pressure forming device of molding equipment technical field, including extruder, and the extruder is equipped with forming head, the forming head is matched with cutter, the cutter is connected with telescopic link, the forming head is matched with material receiving subassembly, the material receiving subassembly includes support platform, moving platform and carrier plate, the carrier plate is placed on moving platform, the both ends of moving platform bottom are respectively fixedly connected with sliding block, matching slide groove is equipped on the support platform of the sliding block correspondence, screw rod is equipped in the slide groove, and one end of screw rod is connected with forward and reverse motor after penetrating slide groove, two the sliding block slidingly arranged in slide groove and with screw rod thread cooperation.The utility model is formed and cutting synchronous, reduces process, saves cost, and the continuity of forming operation is strong, and efficiency is high, the material after forming can be stably carried, reduces deformation, improves the effect of forming, is conducive to production.

The application discloses a laser remelting rare earth modified WC-10Ni coating and a preparation method thereof, and relates to the technical field of tungsten carbide alloy modification. The application solves the problem that the high-performance requirement of a water turbine flow part cannot be met by a supersonic flame spraying preparation process. The method comprises the following steps: pretreating a 0Cr13Ni5Mo martensitic stainless steel base body; preparing a rare earth modified WC-10Ni coating on the surface of the base body by using a supersonic flame spraying technology; and then performing laser remelting treatment under the protection of inert gas, and performing air cooling to obtain the coating, the porosity of the coating is below 1%, and the microhardness is 1000-1400 HV 0.2 . The relative erosion resistance is 6-8 times that of the base body. The application improves the microstructure, the bonding strength, the hardness and the erosion and wear resistance of the rare earth modified WC-10Ni coating, and has important significance for the development of the laser remelting technology.

This invention belongs to the field of cemented carbide additive manufacturing technology and discloses a method for preparing a high-solids WC-Co water-based slurry for direct-write forming. The invention uses cobalt-coated tungsten carbide powder as the solid phase, which is dispersed in an aqueous solution of ammonium citrate and polyethylene glycol composite additives to obtain a WC-Co water-based slurry with a solid content of 90wt%~93wt%. The slurry of this invention exhibits good shear-thinning properties and extrusion shape retention, with a total dispersant dosage of only 1~1.2wt%. After direct-write 3D printing and debinding sintering, a density ≥99% and a Vickers hardness >1900HV can be obtained. 30 The complex structure of WC-Co cemented carbide components is suitable for the low-cost preparation of high-performance cemented carbide in industrial applications.

This application belongs to the technical field of cemented carbide materials, specifically a high-toughness WC-Co cemented carbide and its preparation method. The preparation method includes: using tungsten carbide powder, cobalt powder, tantalum carbide powder, boron source, and tungsten powder as raw materials; mixing and ball-milling all the boron source, tungsten powder, and part of the cobalt powder to obtain a first slurry; mixing and ball-milling all the tungsten carbide powder, tantalum carbide powder, and the remaining cobalt powder to obtain a second slurry; mixing the first slurry and the second slurry, ball-milling, drying, and pressing; and then sintering in three stages with increased temperature to obtain the WC-Co cemented carbide. This application, through the synergistic design of "pre-alloying wet milling" and "medium-temperature heat preservation," guides the uncontrollable boron diffusion reaction process into a directional and gradual reaction path of "B→Co2B→WCoB," thereby avoiding the formation of harmful phases such as brittle WB, optimizing the microstructure of the WC-Co cemented carbide, and improving its mechanical properties.

The application belongs to the technical field of hard alloy, and particularly relates to high-performance hard alloy with dispersed and uniform tantalum carbide and a preparation method thereof. The preparation method comprises the following steps: adding potassium fluotantalate solution into a cobalt-nickel solution; adjusting the pH of the solution to make cobalt, nickel and tantalum completely precipitate, and then filtering, washing with water and drying to obtain cobalt-nickel-tantalum precursors; then reducing, crushing and sieving to obtain precursor powder; mixing the precursor powder with carbon black, tungsten carbide and paraffin, and then wet ball-milling, spray granulating, preparing a compact and sintering to obtain high-performance hard alloy. By adding nickel element, using a liquid-liquid mixing method and reducing, superfine cobalt-nickel solid solution powder is obtained, which can improve the toughness of the alloy; the conversion of tantalum is completed in the sintering process, which is beneficial to the dispersion of tantalum and the strengthening of the alloy performance, improves the solid solution amount of tantalum in cobalt-nickel, inhibits the sintering growth of WC, and improves the hardness and wear resistance of the alloy.

This invention discloses a surface hardening method for universal joints in screw drills and related universal joints. The method includes: performing heat treatment and finishing on a rough-machined universal joint blank to obtain the universal joint body; after preheating the universal joint body, spot welding a tungsten-cobalt alloy block wrapped with nickel-based brazing filler metal to the wear-resistant contact surface at one end of the universal joint body; spraying nickel-tungsten carbide powder and nickel-coated boron carbide composite powder onto the wear-resistant contact surface to form a hardened layer on the wear-resistant contact surface; after cooling, grinding the sprayed surface to the design dimensions; inspecting the porosity of the ground sprayed surface, filling the porosity with nickel-tungsten carbide powder and nickel-coated boron carbide composite powder, heating and melting to seal the porosity; and after cooling, precision grinding the universal joint to the design dimensions. This invention greatly improves the wear resistance and impact fracture resistance of the universal joint, enabling it to be used in conjunction with other screw drill components resistant to 350℃ high temperatures to form screw drills resistant to 350℃ high temperatures.

The application relates to the technical field of ball valve production and processing, and discloses a production and processing technology of a sealed wear-resistant ball valve, which comprises the following steps: base material pretreatment, wear-resistant bottom layer preparation, functional coating slurry preparation, functional coating coating, sealing surface strengthening treatment, intelligent pressure detection module integration, closed-loop control system assembly, hot isostatic pressing densification treatment, precision calibration and performance testing, surface passivation and packaging. In the application, the nano diamond particles and the chromium-based tungsten carbide composite powder in the functional coating slurry jointly construct a high-hardness wear-resistant framework, resist the abrasive wear and erosion of the sealing surface, the molybdenum disulfide serves as a solid lubricant and forms a transfer film on the friction interface during the working process, reduces the friction coefficient, realizes the self-lubricating effect, the epoxy-modified organic silicon resin serves as a bonding phase, firmly combines the functional components, and endows the coating with good toughness and bonding strength, so that the wear-resistant life and reliability of the ball valve sealing pair are synergistically improved under harsh working conditions.

The application provides a nano-diamond compact and a preparation method and application thereof, and belongs to the technical field of diamond compacts. The nano-diamond compact provided by the application comprises a hard alloy substrate and superhard material hot-pressed on the surface of the hard alloy substrate, and the superhard material is prepared from raw materials with the following mass percentage: diamond micro powder 85-95.5%; cubic boron nitride 1.5-6%; tungsten carbide 1-3%; cobalt powder 1-5%; tantalum powder 0.5-3%; vanadium powder 0.2-3%; and graphene 0.1-1%. The cubic boron nitride, the tungsten carbide and the graphene can toughen and strengthen the nano-diamond compact; the cobalt powder, the tantalum powder and the vanadium powder can catalyze and bond. The nano-diamond compact has good toughness, and can effectively avoid the cracking of the nano-structure diamond compact.

The powder material for layered shaping disclosed herein comprises tungsten carbide (WC), cobalt (Co), and carbon additives containing carbon (C) as the main constituent element, and is a powder material with a carbon content A (mass%) value of 6.4 ≤ A ≤ 7.2, wherein the carbon content A is expressed by the following formula: (mass of C derived from WC + mass of C derived from carbon additives) / (mass of WC) × 100.

This invention discloses a preparation process for a high-density tungsten-cobalt cemented carbide, relating to the field of cemented carbide preparation technology. The process includes the following steps: S1: Batching: Tungsten carbide powder, cobalt powder, and a forming agent are precisely weighed according to a preset mass percentage and placed in a high-efficiency mixing device for pre-mixing to ensure that the components are initially and uniformly dispersed, resulting in a stable tungsten-cobalt mixture. This invention employs a multi-stage densification process involving wet ball milling, spray drying, die pressing, and cold isostatic pressing. This not only ensures that the mixture particles are sufficiently refined and uniformly dispersed, producing spherical composite powder with excellent flowability and significantly reducing internal defects in the formed blank, but also further enhances the density and uniformity of the blank through cold isostatic pressing, providing a good foundation for subsequent full densification during sintering, effectively reducing the porosity of the finished alloy and improving the overall structural stability.

The utility model discloses a kind of pretreatment smooth surfacing wear-resistant lining plate, it is related to wear-resistant lining plate technical field.The utility model includes the substrate steel plate, transition layer, wear-resistant layer and smooth layer sequentially arranged;Smooth layer selects laser remelting smooth layer, and it is nanometer tungsten carbide coating, thickness is 0.3-0.5mm, hardness is HV1800-2200, surface roughness is Ra 0.8-3.2 μm;M7C3 type carbide of nanometer tungsten carbide coating is along material flow direction and is distributed in bundle shape.The utility model is through the gradient design of substrate steel plate-transition layer-wear-resistant layer-smooth layer, realize the synergistic effect of high-strength support, stress buffering, wear-resistant protection and surface optimization;Nanometer tungsten carbide coating cooperates high-chromium cast iron layer, forms double wear-resistant barrier, improves wear-resistant life.

This invention discloses a platinum-tungsten carbide-graphene layered cathode hydrogen evolution catalyst, its preparation method, and its application, belonging to the field of proton exchange membrane electrolysis for hydrogen production. The catalyst has a layered structure, formed by graphene, a tungsten carbide layer grown in situ on the graphene surface, and noble metal nanoparticles. The graphene forms a two-dimensional conductive network, the tungsten carbide layer is the intermediate layer, and the noble metal nanoparticles are the active centers; wherein the noble metal nanoparticles are Pt nanoparticles, Ru nanoparticles, or Ir nanoparticles. By utilizing the high-speed electron channel provided by graphene, the tungsten carbide layer as the electronic regulation and physical anchoring layer for the noble metal, and the noble metal nanoparticles as the final active centers, the three work synergistically to achieve high activity, high stability, and low noble metal usage.

This utility model discloses a low-resistance lithium battery slitting circular cutter, belonging to the technical field of slitting circular cutter technology. The low-resistance lithium battery slitting circular cutter includes a cutter body and a cutting edge. The outer ring of the cutter body is integrally formed with the cutting edge. A spiral airflow groove is formed on the side wall of the cutter body, and a wavy cutting edge is provided on the cutting edge, which is coated with a gradient coating. The spiral airflow grooves are arranged in a ring at equal intervals, with 3-6 grooves. The surface roughness Ra within the spiral airflow grooves is ≤0.4μm. The low-resistance lithium battery slitting circular cutter of this utility model features a wavy cutting edge design that reduces the effective contact area. Combined with the air film and gradient coating, the overall cutting resistance is reduced, improving cutting efficiency. The spiral airflow grooves generate centrifugal airflow through high-speed rotation, which can remove more than 60% of the frictional heat, keeping the cutting edge temperature below 80℃ and avoiding material melting or adhesion problems caused by overheating. The tungsten carbide coating and the gradient coating work synergistically to significantly reduce surface energy.

The application relates to the technical field of hard alloy, and discloses a high-temperature-resistant hard alloy and a preparation method thereof, which comprises the following raw materials in parts by mass: tungsten carbide powder 80-90 parts, cobalt powder 1.5-2 parts, nickel powder 2-3 parts, iron powder 1-2 parts, niobium powder 0.5-1 part, tantalum powder 0.5-1 part and composite additive 3-5 parts. In the sintering process, the core-shell particles in the composite additive are combined with yttrium and oxygen elements in diyttrium trioxide to generate nanometer-sized phases which are dispersed at alloy interfaces, promote hard alloy grain refinement, and improve the mechanical properties and high-temperature resistance of the hard alloy. The crosslinked network structure carbon formed by lignin and boric acid on the surface of the core-shell particles is carbonized to form a crosslinked carbon network structure, the nanometer-sized phases are dispersed in the crosslinked carbon network structure, have an adsorption effect on the nanometer-sized phases, and the mechanical properties and high-temperature resistance of the hard alloy are improved.

This invention provides a high-durability MPO multi-core fiber optic connector ferrule, relating to the connector field. The high-durability MPO multi-core fiber optic connector ferrule includes a plastic part, with a ferrule body disposed inside the plastic part. Guide pin holes are symmetrically arranged at one end of the ferrule body, and tungsten carbide sleeves are disposed within the guide pin holes. Multiple evenly distributed fiber core holes are disposed in the middle of one end of the ferrule body. By embedding tungsten carbide sleeves within the PPS guide pin holes, the high hardness and wear resistance of tungsten carbide, far superior to that of PPS plastic, allows the guide holes to withstand numerous mating and unmating cycles with almost no wear. This increases the connector's mating and unmating life from hundreds of cycles to thousands or even tens of thousands of cycles, completely solving the wear resistance bottleneck of the PPS material itself.

This invention proposes a central trough with a tungsten carbide-reinforced wear-resistant layer and its preparation method. The central trough body includes a shovel plate sidewall, a baffle plate sidewall, and a middle plate and a bottom plate for connecting the two sidewalls. Multiple first mounting grooves are provided on the upper surface of the middle plate, and a second mounting groove is provided on the inner side of the shovel plate sidewall, on the side in contact with the shovel plate. A tungsten carbide wear-resistant layer is provided in both the first and second mounting grooves. The tungsten carbide wear-resistant layer is metallurgically bonded to the central trough body, which is a casting. This invention avoids the problems of stress concentration and easy detachment of the wear-resistant layer in traditional cast-welded structures by metallurgically bonding the tungsten carbide wear-resistant layer to the central trough body. By providing the tungsten carbide wear-resistant layer in the coal transport and contact positions with the scraper, this invention can specifically solve the wear failure problem in the core area of ​​the central trough body.

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 relates to the field of superhard material, and particularly relates to a kind of corrosion-resistant diamond compact.The diamond compact includes corrosion-resistant base body and polycrystalline diamond layer.The polycrystalline diamond layer includes cobalt, nickel, tantalum;The method for preparing corrosion-resistant diamond compact includes the following steps: step 1: corrosion-resistant base body preparation, tungsten carbide powder, cobalt powder, nickel powder, chromium powder and tantalum powder are mixed, and vacuum sintering is carried out after compression molding, to obtain corrosion-resistant base body;Step 2: diamond micro powder is mixed with catalyst, then loaded into high-temperature metal cup, then loaded into the above-mentioned corrosion-resistant base body and packaged, and then loaded into high-temperature high-pressure container;Step 3: high-temperature high-pressure synthesis sintering, the high-temperature high-pressure container is placed into six-surface pressing machine, and pressure and heating are carried out, to obtain diamond compact;The corrosion-resistant diamond compact in the present application can be applied to drilling operation in the presence of acidic liquid or corrosive gas and greatly improve the corrosion resistance of diamond compact.

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.

This diamond-coated tool includes: a substrate made of tungsten carbide-based cemented carbide; a WC x layer provided directly above the substrate and having a composition represented by formula 1; and a diamond layer provided directly above the WC x layer, where x is 0.27 to 0.67 in formula 1: WC x .