313 results about "Tungsten alloy" patented technology

The invention provides a graphene reinforced copper-tungsten alloy material, a preparation method, an electrical contact and application. The preparation method comprises the steps that raw materials are prepared, specifically, tungsten powder, first graphene powder and first copper powder are weighed to prepare a plurality of grades of tungsten framework mixtures according to different proportions, and copper paste prepared by mixing second copper powder and second graphene powder according to a set proportion is weighed; molding and compounding treatment: sequentially loading the tungsten skeleton mixtures of multiple grades into a mold, carrying out layered cold pressing to obtain a preformed blank, and carrying out hot-pressing compounding treatment on the preformed blank in a protective atmosphere to obtain a tungsten skeleton pressed blank; infiltrating treatment: injecting copper slurry into the tungsten skeleton pressed blank, and carrying out vacuum infiltrating to obtain an infiltrated alloy body; and densification treatment is conducted, specifically, the infiltrated alloy body is placed in the protective atmosphere to be subjected to hot pressing treatment, and the graphene reinforced copper-tungsten alloy material is obtained. The mechanical property, the conductivity, the frictional wear resistance and the arc ablation resistance of the tungsten alloy material are synergistically improved, so that the material has excellent comprehensive performance.

The invention belongs to the technical field of tungsten alloy, and particularly discloses a tungsten alloy electrode material and a preparation method thereof.The tungsten alloy electrode material comprises, by weight, 0.1%-0.2% of lanthanum boride, 0.2%-0.5% of zirconium oxide, 0.2%-0.6% of boron carbide, 0.4%-0.8% of cerium oxide, 0.5%-1.2% of tantalum carbide, 1.4%-1.8% of modified carbon nanotubes and the balance tungsten powder. The lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes are added into the tungsten powder, under the combined action of the lanthanum boride, the zirconium oxide, the boron carbide, the cerium oxide, the tantalum carbide and the modified carbon nanotubes, the tensile strength and the electrical conductivity are effectively improved, and the high-temperature stability tungsten powder has excellent high-temperature stability and wide application prospects.

The invention provides a high-temperature-resistant creep-resistant tungsten alloy, and relates to the technical field of powder metallurgy, the tungsten alloy comprises, by mass, 3-8 wt% of Re, 0.2-1 wt% of carbide, 0.1-0.5 wt% of boride, and the balance tungsten and inevitable impurities; the carbide is selected from one or more of TiC, ZrC, TaC and HfC; the boride is selected from one or more of TiB2 (titanium diboride), HfB2 (hafnium diboride) and ZrB2 (zirconium diboride). The high-temperature-resistant creep-resistant tungsten alloy is prepared by adding low-content rhenium, carbide and boride into pure tungsten and adopting a unique preparation method, and the technical defects that an existing tungsten-rhenium alloy is insufficient in strength and creep resistance at the ultrahigh temperature (larger than or equal to 2000 DEG C), and a traditional multi-pass processing technology is complex are overcome.

The utility model relates to an X-ray tube anode target disc fixing structure which comprises a rotor, and an anode target disc, a fixing nut, an anti-loose gasket and a locking cover are sequentially installed on the rotor. The locking cover tightly presses the anti-loose gasket, so that the anti-loose gasket generates elastic deformation between the fixing nut and the locking cover; the anti-loose gasket is a wave-shaped gasket; an anti-rotation structure is arranged between the rotor and the anode target disc, the anti-loose gasket is provided with 4-6 waveforms and is made of molybdenum alloy or tungsten alloy, and the rotor is in clearance fit with the anode target disc. The utility model has the advantages of high reliability, long service life and low assembly requirement, eliminates the gas retention risk of the internal closed cavity, and realizes the directional dredging of the gas by establishing a communication channel between the cavity and the external high vacuum environment.

The invention provides an ultrathin-wall niobium-tungsten alloy and titanium alloy dissimilar metal electron beam welding method which comprises the following steps: step 1, cleaning the to-be-welded parts of niobium-tungsten alloy and titanium alloy by using absolute ethyl alcohol, and then drying; step 2, assembling; the niobium-tungsten alloy and the titanium alloy part are in butt joint and fixed; 3, vacuum electron beam welding is used for positioned welding; and 4, formal welding is conducted. After welding, the surface of a welding seam is formed well, good metallurgical fusion is achieved, and the welding seam welded through a vacuum electron beam meets the QJ 20622-2016 I-level standard; under the room temperature condition, the tensile strength of the welding seam reaches 80% of that of titanium alloy base metal; a hydraulic strength test is carried out on a welding seam, and the welding seam is free of leakage and deformation when the pressure is maintained for 5 minutes under 4.1 MPa. An airtight test is carried out on a welding seam, the requirement that air leakage is avoided under the pressure of 3 MPa for 5 min is met, and the design structure size is promoted to continuously break through in the miniaturization and precision direction.

The invention discloses an electrode assembly for a high-power pulse xenon lamp and a preparation method of the electrode assembly, and aims to overcome the technical defects that a traditional electrode is large in mass and poor in reliability and stability. The electrode assembly is mainly composed of an electrode tip, an electrode stem and a lead seat which are made of cerium-tungsten alloy, niobium and stainless steel. The electrode tip and the electrode rod are stably connected in a mode of combining brazing with interference connection, and the electrode rod and the lead seat adopt a multi-connection structure of brazing, threaded mechanical connection and micro interference connection; the assembled electrode assembly is subjected to degassing, brazing connection and electrode activation treatment at a time in a high-temperature and high-vacuum environment, and the problem of electrode material pollution caused by repeated heating is effectively avoided. The electrode assembly is simple in overall structure, reliable in preparation, excellent in current passing ability, capable of bearing impact force under extreme working conditions and outstanding in burning loss resistance, reliability and stability are remarkably improved, and the long-term stable working requirement and large-scale mass production of the high-power pulse xenon lamp are met.

The application discloses a catalyst for preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate and a preparation method thereof. The catalyst comprises an active component, an auxiliary component and a carrier. The active component is a single substance or an oxide of Cu, the auxiliary component is a single substance or an oxide of W, the high active site is a Cu-W alloy interface and single Cu and W metals, and the carrier is one or more than two of silicon dioxide, aluminum oxide, zirconium oxide, zinc oxide, magnesium oxide and cerium oxide. The copper-tungsten alloy catalyst provided by the application has the advantages of structural stability, high mechanical strength, good heat conduction performance, high substrate conversion rate and high product selectivity. The preparation method is simple in steps, easy in raw material acquisition, low in cost, green in pollution, good in preparation repeatability and easy in scale production. The catalyst has extremely high stability and catalytic activity in the reaction of preparing methyl acetate or ethanol by hydrogenation of dimethyl oxalate, high ethanol or methyl acetate yield and high active component utilization rate.

The application provides a molybdenum-tungsten alloy composite rotary target repairing method, which comprises six steps of target disc defect inspection, mechanical treatment, preliminary filling, electron beam cladding, stress relief annealing and post-treatment. The molybdenum-tungsten alloy composite rotary target repairing method of the application analyzes the information such as defect type, form, size, material composition and content of the waste molybdenum-tungsten composite rotary target disc or the molybdenum-tungsten composite rotary target with defects in the production process, adopts different filling methods, performs local cladding through an electron beam, and finally obtains the repaired molybdenum-tungsten alloy composite rotary target. The molybdenum-tungsten alloy composite rotary target repaired by the method has high density and high strength of the combined part, and the quality is equivalent to that of the original product, which can fully meet the use requirements of the X-ray tube, and effectively realizes the reuse of the waste molybdenum-tungsten composite rotary target disc or the molybdenum-tungsten composite rotary target with defects in the production process.

The invention discloses a copper-tungsten alloy waste cleaning and recycling method based on hydrogen reduction, belongs to the technical field of non-ferrous metal waste cleaning metallurgy and resource circulation, and aims at solving the problems that a traditional recycling method is high in energy consumption, complex in process, heavy in secondary pollution, difficult to consider both the metal recycling rate and the metal purity, large in high-temperature operation safety risk and the like. According to the method, the tungsten-copper alloy waste is sequentially subjected to primary crushing, oxidation, primary reduction, separation, secondary reduction, screening, tertiary reduction, secondary crushing, airflow pulverization, acid pickling and impurity removal and other procedures, cooperative operation is carried out in cooperation with special equipment such as an oxidation reaction tank and a reduction reaction kettle, and meanwhile mixture separation and a hydrogen internal circulation system are integrated; efficient cleaning, separation and extraction of tungsten and copper are achieved, and the energy utilization and resource circulation level is improved. Tungsten and copper are separated thoroughly, the product purity is high, energy consumption is low, the metal recovery rate is high, no three wastes are discharged in the whole process, the green low-carbon circular economy concept is met, the recovery rate of the obtained tungsten powder and copper powder is larger than or equal to 99%, the oxygen content is smaller than 0.05 wt%, and the particle size uniformity is excellent.

The invention belongs to the technical field of nickel-tungsten alloy preparation, and particularly discloses a medium-density high-strength high-plasticity-toughness nickel-tungsten alloy bar and a preparation method thereof, and the preparation method comprises the steps of cast ingot preparation, high-temperature homogenization, cogging forging, intermediate forging, finished product forging and heat treatment. Firstly, a cast ingot is prepared through vacuum induction melting and vacuum consumable arc melting, after high-temperature homogenization, cogging forging adopts combination of a hard sheath and a soft sheath and upsetting deformation, intermediate forging reduces the temperature and adopts upsetting, edge surface alternation and octagonal deformation, and finished product forging is subjected to room-temperature cold deformation after solution treatment. And finally, Ni4W phase precipitation is promoted through aging heat treatment. The prepared nickel-tungsten alloy bar has the density of 10.9 g / cm < 3 >-11.6 g / cm < 3 > and the tensile strength of 1600 MPa, has the characteristics of uniform structure, fine grains, medium density, high strength and high plasticity and toughness, and is suitable for the fields of industrial manufacturing, mechanical engineering and the like.

A cooling device includes a tungsten alloy cooling pad (10), a first substrate (20), a second substrate (30) and multiple connecting columns (40). The tungsten alloy cooling pad (10) is used for being attached on the heat source (H). The first substrate (20) is parallelly superposed on the tungsten alloy cooling pad (10). The second substrate (30) corresponds to the first substrate (20) to be parallelly arranged. Each connecting column (40) is perpendicularly connected between the first substrate (20) and the second substrate (30). Each connecting column (40) is arranged in a matrix. Accordingly, the tungsten alloy cooling pad (10) can rapidly disperse and transfer the heat of the heat source (H) to the first substrate (20) and transfer to the second substrate (30) through each connecting column (40) for cooling to avoid heat accumulation leading to overheat.

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 present application relates to alloy plating technical field, specifically relates to a tungsten alloy plating and its preparation method, and a hole lining pipe, the tungsten alloy plating is tungsten nickel alloy plating, plating is dense and has no defect, thickness is 40~100 μm, and Vickers hardness is not less than 900 HV1, the plating uses nickel sulfamate and sodium tungstate as main salt, is supplemented with specific composite complexing agent, conductive salt, buffer and additive, forms stable electroplating solution, is cleaned through plasma, and is combined with profiling anode and pulse electroplating technology, and is carried out electroplating under the matching pulse parameter and mechanical stirring.The method can deposit the high-hardness tungsten alloy plating of thickness uniformity, excellent performance on the inner wall, outer wall and all hole inner surface of the hole lining pipe of complex shape workpiece, in particular, solves the technical problem of uniformity of surface plating of deep hole and complex structure parts.

The invention belongs to the technical field of material detection and analysis, and particularly relates to a tungsten alloy wire cold inlaying mold and device and a section sample preparation method. The tungsten alloy wire cold inlaying device comprises a mold body, a mold cover plate, a base, a supporting rod and a fixing assembly; one end of the tungsten alloy wire is placed in the mold body and fixed through the mold cover plate, the other end of the tungsten alloy wire vertically and upwards penetrates through the fixing assembly to be fixed, then the tungsten alloy wire is subjected to cold inlaying and curing through an inlaying material containing epoxy resin, aluminum oxide powder and a curing agent to obtain an inlaying sample, the inlaying sample is ground and polished, and the tungsten alloy wire section sample is obtained. The cold inlaying device is optimized and can inlay a plurality of tungsten alloy wires at the same time, so that the operation difficulty is reduced, the efficiency is improved, and the cost is reduced; by improving the hardness of the inlay material, the tungsten alloy wire can be better protected, the tungsten alloy wire is not prone to cracks during grinding and polishing, and a foundation is provided for guaranteeing the integrity of the section of the tungsten alloy wire.

The invention discloses a high-performance tungsten alloy bar and a preparation method thereof, and relates to the field of tungsten alloy preparation.The preparation method comprises the following steps that composite powder is prepared into a pressed blank and then subjected to multi-section sintering, and a bar a is obtained; wherein the hard phase and the soft phase in the bar a are in an isotropic uniform dispersion shape; the bar a is subjected to high-temperature deformation treatment, and a bar b with a hard phase and a soft phase initially oriented in the axial direction and refined grains is obtained; the bar b is subjected to multiple times of cooling deformation treatment, and a bar c is obtained; the hard phases and the soft phases of the bar c are alternately arranged in the deformation direction to form a composite structure. And the bar c is subjected to multiple times of aging treatment, and the high-performance tungsten alloy bar with the two phase interfaces anchored mutually in the composite structure is obtained. According to the high-performance tungsten alloy bar and the preparation method thereof, the problems that work hardening is serious, plastic processing difficulty is large, and toughness is prone to being damaged are effectively solved, and collaborative optimization of strength and toughness is achieved.

The invention relates to the technical field of alloy coatings, and particularly discloses a nickel-tungsten alloy coating for a perforated liner tube and a preparation process of the nickel-tungsten alloy coating. The preparation process of the nickel-tungsten alloy coating for the perforated liner tube comprises the following steps: S1, pretreatment: firstly, performing degreasing treatment on the perforated liner tube by adopting pore channel degreasing fluid, and then performing activating treatment on the perforated liner tube by adopting pore channel activating fluid; s2, plating: placing the pretreated perforated liner tube in a nickel-tungsten chemical plating solution for chemical plating to form a nickel-tungsten alloy plating layer; s3, post-treatment is conducted, specifically, the plated lining pipe with the holes is immersed into an acid passivation solution for passivation treatment; then carrying out ultrasonic peening; and then the perforated liner tube is placed in the nano composite hole sealing liquid to be subjected to dipping hole sealing treatment. According to the preparation process of the nickel-tungsten alloy coating, through the synergistic effect of multiple steps, the durability and anti-falling performance of the nickel-tungsten alloy coating of the perforated liner tube are remarkably improved.

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.

The utility model provides a drill-bit-shaped tungsten alloy test piece. The drill-bit-shaped tungsten alloy inlaid test piece comprises a bottom plate; the supporting frame is fixedly connected to the top of the bottom plate, the top of the supporting frame is fixedly connected with a test board, and two mounting plates are mounted at the top of the test board. According to the test piece inlaid with the drill-bit-shaped tungsten alloy, through the design, the contact area is large, uniform contact pressure can be provided, contact resistance can be remarkably reduced through large-area contact, the stability of signal transmission is guaranteed, signal reflection or loss is reduced, the finger-shaped process is simple, the production cost is relatively low, and the test piece is suitable for popularization and application. Benefited from the drill-bit-shaped tungsten alloy head which is similar to a triangular structure and is stable, more stable strength is achieved in repeated tests, poor contact caused by breakage of the head tungsten alloy is avoided, and therefore the more stable and reliable contact effect is achieved.

The invention belongs to the technical field of alloy materials, and particularly relates to a high-conductivity ablation-resistant graphene copper-tungsten compact composite material and a preparation method and application thereof. According to the preparation method of the high-conductivity ablation-resistant graphene-copper-tungsten compact composite material, graphene, copper and tungsten are combined through in-situ reaction, interface bonding among graphene, copper and tungsten is high, graphene is not prone to agglomeration in a matrix, the reinforcement phase effect of graphene can be effectively achieved, and the ablation resistance of the graphene-copper-tungsten compact composite material is improved. The graphene copper-tungsten alloy with high compactness, high conductivity and ablation resistance is obtained by matching with subsequent spark plasma sintering, hot extrusion and other hot processing technologies, and the performance requirements of the fields of high-voltage electric appliance switches, electrical contacts, electrode materials and the like on materials can be met; according to the preparation method, the mixing technology and the preparation technology of the graphene copper-tungsten alloy composite powder are improved, the high-performance graphene copper-tungsten alloy material can be provided, and the technical problem that in the prior art, the high-performance graphene copper-tungsten alloy is difficult to prepare is solved.

The invention relates to a high-performance nickel-tungsten alloy electroplating solution for MEMS and a preparation and electroplating method of the high-performance nickel-tungsten alloy electroplating solution. Comprising the following steps: sputtering a seed layer on the surface of a substrate, processing a glue film with a required plating pattern on the surface of the seed layer, then carrying out pretreatment, and putting the substrate subjected to pretreatment into nickel-tungsten alloy electroplating liquid for electroplating. The formula of the electroplating liquid comprises nickel salt, tungsten salt, a main complexing agent, an auxiliary complexing agent, a leveling / brightening agent, a surfactant, a pH regulator and deionized water. The plating layer obtained through the method has the comprehensive performance advantages of being compact, smooth, low in porosity, high in hardness, excellent in abrasion resistance, low in internal stress and the like.

The application discloses a tungsten alloy wire material for diamond wire bus and a preparation method thereof, and relates to the technical field of hard silicon material cutting wire material. The tungsten alloy wire material is prepared by using hydride, carbon and tungsten powder as raw materials or carbide and tungsten powder as raw materials. When the hydride, carbon and tungsten powder are used as raw materials, the percentage of the hydride in the total mass is 0.80-7.50%, the hydride is one or more of HfH2, TaH, TiH2 and ZrH4, and the particle size of the hydride is 0.5-1.5 microns. The carbon is carbon powder or carbon nanotube, the particle size of the carbon powder or carbon nanotube is less than or equal to 1.0 micron, and the percentage of the carbon in the total mass is 0.10-1.5%. When the carbide and tungsten powder are used as raw materials, the carbide is one or more of TiC, ZrC, TaC and HfC, the particle size of the carbide is 0.5-1.0 micron, the percentage of the carbide in the total mass is 1.0-8.0%, and the particle size of the tungsten powder is less than or equal to 3.0 microns.

The invention belongs to the field of copper-tungsten materials, and particularly discloses graphene-coated aluminum oxide and a preparation method thereof, a copper-tungsten material and a preparation method thereof, and a contact material. The graphene-coated aluminum oxide has good interface bonding of alpha-Al2O3-O / C, has good mechanical property, heat-conducting property and electrical conductivity, is uniformly dispersed in the copper-tungsten alloy to form a binary reinforced phase, constructs an efficient carrier, load and heat transfer network in the copper-tungsten alloy, and improves the heat transfer efficiency of the copper-tungsten alloy. The hardness, the strength, the ablation resistance and the friction and wear resistance of the copper-tungsten material are enhanced; and then the copper-tungsten material is processed into the high-voltage circuit breaker contact material, so that the service life and the reliability of the high-voltage circuit breaker can be improved, and the high-voltage circuit breaker is more suitable for being applied to scenes needing frequent switching working conditions.

The utility model relates to the technical field of milling cutters, in particular to an anti-impact tungsten alloy milling cutter which comprises a cutter handle, a collet chuck is mounted on the inner side of the cutter handle, a nut is in threaded connection with the top of the cutter handle, a milling cutter head is mounted on the inner side of the nut and the inner side of the collet chuck, and a plurality of threaded grooves distributed in a polar axis mode are formed in the outer side of the cutter handle. Through the arrangement of the threaded groove, the bolt, the protective cover, the mounting hole plate, the through groove, the sealing ring and the anti-impact assembly, after the milling cutter head is mounted, the protective cover can be arranged on the outer side of the milling cutter head in a sleeving mode, the bolt is screwed into the threaded groove, and therefore mounting of the protective cover is completed, and the design can seal the connecting position of the milling cutter head and the collet chuck; and when the milling cutter head is not used, the protective barrel can be inserted into the inner side of the fixed barrel, so that the clamping ring is connected with the clamping groove in a clamping manner, and the design of the protective barrel can prevent external articles from impacting the milling cutter head to cause breakage of the milling cutter head.

The invention belongs to the technical field of material detection and analysis, and particularly relates to a tungsten alloy wire multi-layer cold inlaying mold and a cross section sample preparation method. The tungsten alloy wire multi-layer cold inlaying die comprises a bottom cover plate, a lower-layer cylinder body, a middle cover plate, an upper-layer cylinder body and a through hole formed in the geometric center of the middle cover plate, and the cold inlaying die is symmetrical about the plumb line of the geometric center of the middle cover plate. The tungsten alloy wire is cold-inlaid and fixed in the lower layer of the mold through an inlaying material containing epoxy resin, alumina powder and a curing agent, the other end of the tungsten alloy wire penetrates through the through hole to suspend the cold-inlaid mold, then the tungsten alloy wire is cold-inlaid and cured in the upper layer of the mold, and finally, the inlaid sample is ground and polished to obtain the tungsten alloy wire section sample. According to the technical scheme, cracks caused by too fine wires can be effectively prevented; the tungsten alloy wire is kept vertical by using the lower-layer counterweight of the die, which is accurate and time-saving; the tungsten alloy wire continuous section sample is obtained through multi-layer cold inlaying, the microstructure uniformity of the tungsten alloy wire continuous section sample is conveniently determined, and the method is of great significance to production practice and experimental detection.

The application discloses a feeding structure for tungsten alloy rod machining, which comprises a workbench, a storage assembly is connected to the workbench, and tungsten alloy rods are placed in the storage assembly. In the use process of the device, workers can place tungsten alloy rods in the storage assembly in advance through a conveying belt, then the tungsten alloy rods can be gradually rolled out with the assistance of a first blocking assembly and a material guiding assembly, then a first camera of the material guiding assembly and a second camera of a pushing assembly can take photos of the surface of the tungsten alloy rods, then workers can directly watch the photos, workers do not need to manually take the materials, workers can start corresponding second electric telescopic rods through the feedback of the photos, so that the materials can be pushed into suitable collecting frames, workers can detect the tungsten alloy rods, workers do not need to manually take and turn over the materials, and the workload of workers is further reduced.

The invention discloses a tungsten alloy plating layer high-wear-resistance anticorrosion expansion joint and a manufacturing method thereof.The expansion joint is made of 110SS steel, the tungsten alloy plating layer is arranged on the surface of the expansion joint, the hardness of the tungsten alloy plating layer ranges from 550 HV to 1100 HV, and in the tungsten alloy plating layer, the mass content of tungsten is larger than or equal to 15%, and the mass content of nickel is larger than or equal to 70%. The material of the expansion joint is optimized and 110SS is adopted, so that the cost of raw materials is greatly reduced, the production cost of the whole expansion joint is further reduced, tungsten alloy plating layers are arranged on the surfaces of the parts, and the high hardness characteristic of the plating layers enables the expansion joint to have excellent wear resistance and can adapt to the complex underground movement and friction environment of the expansion joint. In the manufacturing process, due to strict pretreatment control, the binding force is high, and the porosity is larger than or equal to 9 levels. In other words, the tungsten alloy plating layer and the base body are in atomic bond combination, and the tungsten alloy plating layer cannot fall off through a bending test and a tension test, so that the tungsten alloy plating layer on the surface of the tool is difficult to fall off.

The application discloses a heterostructure nanocrystalline tantalum-tungsten alloy film and a preparation method thereof. The method selects a tantalum-tungsten alloy prepared by electron beam vacuum melting as a target material, and uses a direct current magnetron sputtering method to prepare a heterostructure nanocrystalline tantalum-tungsten alloy film composed of small-grain-size columnar crystal structures close to a substrate and large-grain-size columnar crystal structures close to a surface on a substrate. The direct current magnetron sputtering method is adopted, the tantalum-tungsten alloy is selected as the target material, and the film structure is adjusted by regulating the direct current magnetron sputtering parameters including a sputtering power, a sputtering time and a substrate temperature, so that a bimodal heterostructure nanocrystalline tantalum-tungsten alloy film with mixed small-grain-size and large-grain-size columnar crystal structures is obtained, the hardness of the tantalum-tungsten alloy film is improved, and the tantalum-tungsten alloy film is suitable for fields such as a gun barrel coating and a cutter coating.

A tantalum-tungsten alloy product and a preparation method therefor where the method comprises: (1) providing spherical tantalum-tungsten alloy powder, wherein the powder is characterized in that the lower limit of the particle size is 15 μm-25 μm, the upper limit of the particle size is 50 μm-60 μm, the time for 50 g of the powder to pass through a standard funnel is 5-10 seconds, the sphericity of the powder is greater than or equal to 0.8, the hollow particle ratio of the powder is less than or equal to 5%, and the apparent density is 9-11 g / cm3; (2) processing and molding the powder by using a 3D printing process to obtain a printed blank; (3) performing printing post-treatment on the blank; and (4) performing vacuum heat treatment on a product from step (3), wherein the temperature of the heat treatment is 1350° C. to 1750° C., and the time is 30-90 minutes.

The utility model discloses a clamping mechanism of a tungsten alloy roller grinding machine, which belongs to the technical field of grinding equipment and comprises a base plate, two sides of the top surface of the base plate are respectively provided with a pair of lifting cylinders, the tops of the output ends of the lifting cylinders on the same side are connected with bearing beams, a movable beam is slidably connected between the two bearing beams, and the movable beam is connected with a driving component. The bottom face of the movable beam is rotationally connected with a plurality of clamping assemblies, the clamping assemblies clamp a machine shell of a grinding machine, a carrying plate is connected between the two lifting air cylinders on the tail side of the base plate, a grinding cylinder corresponding to the grinding machine is arranged on the carrying plate, and a cylinder body of the grinding cylinder is connected with a cooling assembly. According to the mechanism, the grinding machine is fixed through the clamping assembly, rapid lifting and translation of the grinding machine can be achieved under the cooperation of the lifting air cylinder and the driving assembly, the disassembly, assembly and cleaning processes of the machine are greatly facilitated, and the maintenance and use efficiency of the grinding machine is improved.

The invention discloses a process for preparing a fine-grain copper-tungsten alloy through an infiltration method, the copper-tungsten alloy is a copper-tungsten material with the copper mass percent larger than 50%, namely copper as a base, and the process flow comprises the steps that firstly, tungsten-copper composite powder is prepared through an atomization drying method, soluble tungsten salt and copper salt powder are used as raw materials for atomization drying, and then the tungsten-copper composite powder is prepared; the salt powder is dissolved in water or an organic solvent to prepare a solution, then precursor powder is obtained through atomization drying, and the precursor powder is calcined and reduced to obtain tungsten-copper composite powder; then mixing the tungsten-copper composite powder with pure copper powder to form a mixture; then the mixture is subjected to compression molding to obtain a tungsten-copper framework; and finally infiltrating copper into the tungsten-copper framework to obtain the alloy. Compared with a traditional infiltration method for producing the tungsten-copper alloy, the alloy prepared through the method is high in copper content, small in tungsten grain and uniform in structure, tungsten particles are wrapped by a copper phase, and the alloy is a novel fine-grain copper-tungsten alloy with potential application prospects.