162 results about "Arc melting" patented technology

The invention discloses a method for preparing spherical metal fine powder by using coarse / waste powder through ultrasonic atomization, which comprises the following steps of: (1) collecting coarse / waste powder raw materials for ultrasonic atomization powder preparation, (2) conveying the coarse / waste powder to an electric arc melting area through argon gas flow, and carrying out melting and ultrasonic atomization powder preparation processing; (3) in the powder preparation process, the powder is continuously collected by using argon circulating airflow, so that the continuity of the powder preparation process is ensured; and (4) finally screening the prepared powder in particle size ranges to obtain high-quality spherical fine powder in different particle size ranges. According to the method, the recycling and reusing problems of 3D printing splashing waste powder and coarse powder in the traditional gas atomization powder manufacturing process are solved, and the powder pollution risk is remarkably reduced; according to the ultrasonic atomization re-powdering technology, the high-quality spherical metal fine powder needed by additive manufacturing can be efficiently prepared, powder waste discharge and environmental burden are reduced, the obtained powder can be directly used as a high-quality raw material for additive manufacturing, and green and sustainable development of the metal additive manufacturing industry is promoted.

The invention discloses a TA4-xB alloy and a preparation method thereof, the content of B in the alloy is 0.01-0.5 wt%, and the balance is Ti and other impurities. The preparation method comprises the following steps: dividing sponge titanium and TiB2 wrapped by pure titanium foil into three equal parts, smelting in three times by adopting a vacuum non-consumable arc smelting furnace to obtain three button ingots, then putting the three button ingots into the smelting furnace for secondary smelting to obtain an alloy ingot, and finally overturning and repeatedly smelting the alloy ingot obtained by cooling after secondary smelting for three times. A TA4-xB alloy cast ingot with uniform components is obtained through smelting, the cast ingot is machined through a cast ingot machine and subjected to forging-free direct rolling to form a plate, the rolling temperature is 940 DEG C, the finish rolling temperature is 880 DEG C, five passes of rolling are conducted, the rolling deformation of the first pass is 50% or above, and the accumulative deformation is 90%. According to the method, a proper amount of B element is added, a TiB phase is generated in the TA4 titanium material, grains are refined, and then the mechanical property of the TA4 titanium material is improved through multi-pass large-deformation rolling. The method is low in process cost, short in flow, good in material comprehensive performance and free of large-scale equipment transformation.

The invention discloses a forging and rolling combined method for preparing a large-specification super-long titanium alloy thick plate, which comprises the following steps of: S1, reversely deducing the size of a plate blank and the total amount of required raw materials according to the geometric size and working allowance of a target forged plate, designing the weight of a single cast ingot, mixing the raw materials and pressing into an electrode block, a titanium alloy cast ingot is smelted and prepared by adopting a three-time vacuum consumable electric arc smelting process; s2, after a high-temperature anti-oxidation coating is sprayed to the titanium alloy cast ingot, multi-heating-number forging is carried out, the multi-heating-number forging comprises high-temperature cogging forging, single-phase region forging and plate blank forming forging, and a rectangular plate blank is manufactured; s3, the plate blank is heated and subjected to two-phase region one-fire rolling, and a semi-finished thick plate is prepared; s4, after cracks and surface defects of the semi-finished thick plate are removed, the semi-finished thick plate is heated and subjected to two-phase region rolling, and a finished thick plate is manufactured; and S5, the super-long thick plate is sequentially subjected to annealing and surface treatment, and the finished plate is obtained. The method has the advantages that the traditional size limitation is broken through, the forming efficiency is improved, and the structure uniformity and the material performance of the large-specification forged plate are improved.

The invention belongs to the field of welding wire preparation, and particularly relates to a method for preparing an ODS steel welding wire based on a spray deposition and electric arc melting combined process. According to the technical scheme, the preparation method comprises the following steps: performing surface modification on Y2O3 particles and Fe powder to prepare mixed powder; an ODS alloy is smelted through a closed double-cabin smelting-injection system; during spray deposition, the preheated mixed powder is loaded; performing electric arc melting to form a nano oxide dispersed phase and strictly controlling the oxygen content of the ingot blank; the ingot blank is subjected to temperature equalization before forging, and H2 / Ar mixed gas is introduced; high-temperature rough rolling and low-temperature finish rolling are adopted for hot rolling strengthening; carrying out solid solution and two-stage aging composite heat treatment; hot drawing wire forming is matched with gradient annealing and protective atmosphere; and carrying out surface treatment through pulse copper electroplating or anti-oxidation layer spraying. According to the method, alloy components and microstructures can be accurately regulated and controlled, the problems of strengthening phase distribution and machining defects can be efficiently solved, and the strict requirements for high performance and high reliability of ODS steel welding wires in the fields of nuclear reactors, aerospace and the like are met.

The invention discloses a dissimilar magnesium alloy composite structure and a low-cost electric arc additive manufacturing method thereof. The method comprises the following steps that 1, AZ series magnesium alloy wires and rare earth magnesium alloy wires are selected; 2, material distribution of the two kinds of wires is subjected to partition design; step 3, preheating the substrate; 4, depositing a material 1 in a single-arc and sequential wire feeding mode, and 5, depositing a material 2 in the middle: depositing the material 2 as a transition layer under a single-arc consumable electrode heat source. And step 6, interface processing. And 7, the component is preheated again, the material 2 continues to be deposited, and finally the AZ-rare earth magnesium alloy composite structure is obtained. According to the method, a single-arc, sequential wire feeding and interlayer friction stir processing cooperation strategy is adopted, the prepared composite structure has the characteristics of controllable performance, structural integration, good interface metallurgical bonding and the like, the performance limitation of a traditional single material is broken through, and the method has wide application prospects in the fields of aerospace, automobile lightweight and the like.

The invention provides a method for preparing an ultra-low elastic modulus titanium alloy based on machine learning and the titanium alloy, and the method comprises the following steps: obtaining component elastic modulus data of the titanium alloy according to a given titanium alloy component; dividing the component elasticity modulus data of the titanium alloy into a training set and a verification set, and virtually generating a to-be-explored titanium alloy component space according to constraint conditions; training a preset elastic modulus prediction model through a domain adversarial neural network, the training set and the to-be-explored titanium alloy component space; through the trained preset elastic modulus prediction model and a genetic algorithm, the components of the titanium alloy with the ultralow elastic modulus are obtained; according to the components of the titanium alloy with the ultralow elastic modulus, the titanium alloy with the ultralow elastic modulus is prepared through electric arc melting. By utilizing the method, the problem of overfitting caused by data sparsity, component discontinuity and characteristic heterogeneity is relieved, so that high-precision exploration of an unknown component space is realized.

The invention discloses a method for preparing a Cr2Nb / Cu composite material through vacuum consumable electric arc melting, which specifically comprises the following steps: step 1, carrying out two times of crushing treatment on Cu, Cr and Nb blocks subjected to ultrasonic cleaning, and screening Cu, Cr and Nb particles with different sizes; 2, Cu particles, Cr particles and Nb particles are mixed, and the mixed particles are pressed into a consumable electrode; 3, the consumable electrode is smelted, and the Cr2Nb / Cu composite material is obtained; fourthly, the Cr2Nb / Cu composite material obtained in the third step is machined into the size needed by the consumable electrode, the Cr2Nb / Cu composite material continues to serve as the consumable electrode to be smelted according to the third step, and the process is repeated for 3-6 times; and 5, densifying the alloy obtained in the step 4 by adopting different hot extrusion processes. The method solves the problems of element segregation and coarse Cr2Nb particles in the Cr2Nb / Cu composite material prepared by the existing casting process.

The application discloses an alloy vacuum self-consumption electric arc smelting magnetic pulse grain refining device, which comprises a vacuum self-consumption electric arc furnace body and a copper crucible, a metal molten pool is arranged in the copper crucible, a plurality of non-contact magnetic pulse coils are wound on the outer wall of the copper crucibble, and a water-cooling interlayer is arranged between the vacuum self-consumption electric arc furnace body and the copper crucible; a screw rod is arranged between the vacuum self-consumption electric arc furnace body and the copper crucible, and the screw rod is connected with a motor. The application further discloses a method for alloy vacuum self-consumption electric arc smelting magnetic pulse grain refining, cooling water is introduced into the water-cooling interlayer, a power supply of the vacuum self-consumption electric arc furnace is turned on for smelting, a pulse power supply is turned on when the height of the metal molten pool formed at the bottom of the copper crucible reaches 50 mm, and the plurality of non-contact magnetic pulse coils are uniformly moved upwards until the process is finished. The metal molten pool is directionally treated by electromagnetic pulse in a moving mode, the columnar crystal-equiaxed crystal transition is realized in the alloy ingot preparation process, the grain is refined, and segregation is reduced, so that the overall organization of the large-size long ingot is refined.

According to the technical scheme, the high-carbon ferrochrome powder electric arc melting equipment is characterized in that the high-carbon ferrochrome powder electric arc melting equipment comprises a body mechanism, a connecting mechanism is installed at the outer end of the body mechanism, a melting mechanism is rotationally connected to the inner end of the body mechanism, and the melting mechanism comprises a rotating piece; the transmission end of the rotating piece is fixedly connected with a transmission wheel, and the outer end of the transmission wheel is connected with a plurality of second rotating wheels in an engaged mode. By arranging a transmission wheel and mixing rods, when the device needs to carry out mixing work, the transmission wheel is started to rotate to be meshed with a plurality of external rotating wheels II, so that the plurality of rotating wheels II simultaneously drive the plurality of mixing rods mounted at the inner end to carry out mixing work, and high-carbon ferrochrome powder in the smelting equipment body can be efficiently smelted; and in cooperation with self transmission of the smelting equipment body, internal raw materials are turned over, so that the equipment efficiently and uniformly performs smelting preparation, and the practicability of the high-carbon ferrochrome powder electric arc smelting equipment is improved.

This invention discloses a rare-earth Ce-purified Ti-Mn-based hydrogen storage alloy and its preparation method. The preparation method includes the following steps: mixing FeV80 with Ce and melting it in a vacuum arc melting furnace under an argon protective atmosphere; polishing the surface of the FeV80-yCe master alloy to remove the surface-enriched impurity phases, obtaining a purified master alloy; mixing the purified master alloy with Ti, Zr, Mn, and Cr raw materials and arc melting it under vacuum conditions; after melting, cooling it to room temperature with the furnace to obtain the rare-earth Ce-purified Ti-Mn-based hydrogen storage alloy. This invention pre-treats FeV80 with Ce, and removes impurities enriched on the surface of the metal ingot through melting and then polishing. The process is simple and cost-controllable, fundamentally solving the problem of impurity deterioration in industrial raw materials, improving the hydrogen storage capacity of the hydrogen storage alloy at 5MPa hydrogen pressure, and meeting the comprehensive performance requirements for industrial applications.

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.

The invention discloses a rare earth-nickel-based AB2 type hydrogen storage alloy material and a preparation method thereof, and relates to the field of solid hydrogen storage materials, the alloy comprises rare earth elements La, Ce and Sc and transition metals Ni, Mn, Al and Zr according to a specific proportion, the raw materials are melted through electric arc melting and are subjected to alloying reaction to form a master alloy ingot, and the master alloy ingot is subjected to high-temperature sintering to obtain the rare earth-nickel-based AB2 type hydrogen storage alloy material. Non-equilibrium solidification is achieved through single-roller rapid quenching, a thin strip of a metastable-state structure is obtained, grain arrangement and second-phase precipitation are regulated and controlled through gradient annealing, finally, a surface oxide layer is removed through crushing and acid etching, and hydrogen storage alloy powder is obtained through vacuum drying. An AB2 type Laves phase main body structure is formed through multi-element rare earth solid solution, grain coarsening is inhibited by combining a rapid quenching process, a microstructure is optimized through gradient annealing, the hydrogen storage capacity, hydrogen absorption dynamic performance and cycling stability of the alloy are synergistically improved, and the alloy is suitable for preparation and application of an efficient hydrogen storage material.

The invention discloses a high-strength, high-plasticity and low-coercive-force soft magnetic high-entropy alloy and a preparation method thereof. The component expression of the soft magnetic high-entropy alloy is FeaCobNicVdMe according to the atomic ratio, M is one or more than two of solid solution strengthening elements Mn, B, Si, Cr, Mo and W, a is larger than or equal to 41 and smaller than or equal to 62, b is larger than or equal to 25 and smaller than or equal to 30, c is larger than or equal to 13 and smaller than or equal to 21, d is larger than or equal to 0 and smaller than or equal to 3, e is larger than or equal to 0 and smaller than or equal to 5, and a + b + c + d + e = 100. The production process is simple, the mother alloy is firstly prepared into a cast plate through induction / electric arc melting and copper mold casting, and the plate-shaped soft magnetic high-entropy alloy is prepared through high-temperature long-time vacuum heat treatment, multi-pass cold rolling, high-temperature short-time recrystallization heat treatment and air cooling.

The application relates to the technical field of alloy materials, and discloses a high-temperature-resistant ternary nickel-based titanium-niobium alloy with a service temperature of 2500 DEG C and a preparation method thereof, which takes nickel, titanium and niobium as core components, and the atomic percentage composition is as follows: 44-46% of nickel, 43-45% of titanium and 9-11% of niobium; and 0.1-0.5% of one or more trace elements of oxygen, aluminum and chromium can be further added. Through optimization of component design, the alloy is thermodynamically stable under an ultrahigh-temperature environment of 2500-2900 DEG C. The preparation method adopts vacuum consumable arc melting or electron beam melting (vacuum degree >= 10 ‑3 Pa), melting, and solves problems such as component segregation and poor machining performance. The alloy is suitable for aerospace and nuclear industry ultrahigh-temperature parts, and the process is stable and easy to mass-produce.

The invention relates to the field of ferrous metallurgy and high-temperature material engineering, in particular to a preparation method and application of a silicon steel annealing furnace roller surface coating based on a double-hollow graphite electrode plasma arc melting diamond-graphite composite coating. A current loop is formed, so that plasma arcs are generated between the electrodes; diamond powder, graphite powder and modified zirconium oxide powder are mixed, nickel-based self-fluxing alloy powder is added, and mixed powder is obtained; argon serves as carrier gas, and the mixed powder is fed into a plasma arc area through a double-hollow graphite electrode; the surfaces of the mixed powder particles are activated and are metallurgically bonded with the surface of a partially molten roller base material by utilizing high temperature and high energy generated by a plasma arc, and a diamond-graphite composite coating is formed on the surface of the roller in a cladding manner; and carrying out post-treatment on the diamond-graphite composite coating according to requirements.

The present invention relates to a method for producing vanadium dioxide using a tetra-arc melting method. Unlike conventional methods that require complex wet processes, long-term high-temperature heat treatment, and multi-stage reduction conditions, this method provides vanadium dioxide with high crystallinity by concentrating electrical energy on a pellet during a short arc discharge time of within a few seconds. This highly crystallin VO₂ has an accurate phase transition temperature, making it effective for use in various applications such as smart windows, heat-blocking coatings, optical films, temperature sensors, thermal switching devices, and next-generation battery materials. Furthermore, the present invention is expected to be utilized across various industrial sites, as it enables the production of highly crystalline vanadium dioxide in a much shorter time compared to existing heat treatment-based technologies, despite its simple device configuration and low manufacturing costs.

The invention belongs to the field of aeronautical material manufacturing, and relates to a method for eliminating arc striking of a crucible wall in the titanium alloy VAR smelting process and application. According to the method, the arc striking phenomenon of the crucible wall in the VAR smelting process of the high-Cl-content titanium sponge is completely eliminated by preventing the high-Cl-content titanium sponge, the consumable electrode and the electrode block from absorbing moisture and adopting multi-row fast extraction degassing and short-arc smelting in the VAR smelting process; specifically, through electrode block structure optimization and technological parameter cooperation, closed-loop control is formed from multiple dimensions of gas generation, gas discharge, arc stability and the like, and the limitation that a traditional method only depends on a single technology is solved; furthermore, moisture absorption prevention control reduces moisture introduction from the source, low forevacuum control strengthens gas discharge in the smelting process, and double control greatly reduces the splashing risk; furthermore, differentiated parameters are formulated for key areas such as welding seams, and the process stability is ensured through quantitative control.

This invention discloses a method and application for improving the low-temperature impact toughness of TC4 titanium alloy, belonging to the field of titanium alloy material preparation technology. The method of this invention sequentially employs electron beam cold hearth melting and vacuum consumable arc melting to prepare TC4 ingots with an oxygen content of 0.11-0.13%. The TC4 ingots are then annealed at the α+β two-phase region temperature, followed by holding and cooling to obtain a TC4 titanium alloy with an equiaxed microstructure. This invention overcomes the defects of existing TC4 titanium alloys, such as decreased impact toughness and brittle fracture at low temperatures, by precisely controlling the oxygen content within a narrow range of 0.11%-0.13% and combining α+β two-phase region annealing to form an equiaxed microstructure. This improves the low-temperature impact toughness of TC4 titanium alloys and makes them suitable for manufacturing high-reliability components for aerospace, polar equipment, and other low-temperature service environments.

The invention discloses a high-strength low-elasticity-modulus titanium alloy sheet and a preparation and processing method thereof, and belongs to the technical field of titanium alloy metal processing. The alloy component is TiaZrbVcAld, a is larger than or equal to 46 and smaller than or equal to 55, b is larger than or equal to 26 and smaller than or equal to 32, c is larger than or equal to 3 and smaller than or equal to 8, d is larger than or equal to 12 and smaller than or equal to 20, and a + b + c + d = 100. The method comprises the following steps: 1, melting an alloy raw material by adopting a vacuum consumable arc melting or induction suspension melting method; 2, the obtained cast ingot is subjected to cogging forging and circulating forging; 3, the alloy forged plate is preheated and rolled at the temperature of 1000 DEG C, and a primary rolled plate is obtained; 4, preheating and rolling the primary rolled plate at 900 DEG C to obtain a secondary rolled plate; 5, the secondary rolled plate is preheated and rolled at the temperature of 900 DEG C and then rapidly cooled, and a tertiary rolled plate is obtained; step 6, trimming and descaling the third rolled plate to obtain a semi-finished product with a bright surface and without burrs; and 7, the semi-finished plate is subjected to cold rolling, and the titanium alloy sheet with the ultimate tensile strength higher than 1200 MPa and the elastic modulus lower than 70 GPa is obtained. According to the method, the thin plate with the performance characteristics of high strength and low elastic modulus can be obtained.

The invention discloses a high-toughness refractory high-entropy alloy based on a hafnium element addition regulation and control deformation mechanism, the general formula of the high-entropy alloy is HfxNbTaTiZr, and x is more than or equal to 0.5 and less than or equal to 1.5; according to the high-entropy alloy, under the low-temperature and high-strain-rate deformation condition, dislocation slippage and twist belt nucleation and expansion are taken as main parts of a microscopic deformation mechanism, in addition, the invention further discloses a preparation method of the high-entropy alloy, and the preparation method comprises the steps that firstly, raw materials are prepared and weighed; 2, vacuum arc melting; (3) vacuumizing; 4, gas washing and argon filling; and 5, arc starting smelting is conducted, and the high-entropy alloy is obtained. According to the HfxNbTaTiZr high-strength and high-toughness refractory high-entropy alloy based on a hafnium element addition regulation and control deformation mechanism provided by the invention, on the premise of ensuring excellent retention of strength, the dynamic toughness of a material is remarkably improved, collaborative optimization of toughness performance is realized, and the defect that the toughness of existing NbTaTiZr and other refractory high-entropy alloys is insufficient under low-temperature and high-speed impact is overcome.

This invention proposes a high-entropy brazing filler metal, its preparation method, and its application for brazing ceramic matrix composites with GH4950 nickel-based superalloy. The alloy formula of this high-entropy brazing filler metal is Ni a Cr b Co c Fe d W e Al f Si g B h Mo i C j In the formula, a, b, c, d, e, f, g, h, and i represent the mass percentages of the corresponding components, satisfying the following conditions: a is 27.7–39.5, b is 19–22, c is 13–15, d is 13–15, e is 6–8, f is 3–4, g is 2.5–3.5, h is 2.3–2.6, i is 1.6–2.0, j is 0.1–0.2, and a+b+c+d+e+f+g+h+i+j=100. This high-entropy solder is atomized by arc melting plasma to obtain spherical powder, which is then made into a slurry powder and uniformly coated onto SiC using screen printing technology. f The surface of the SiC composite material is brazed with GH4950 nickel-based superalloy to obtain a safe and reliable SiC composite material. f The SiC-GH4950 heterogeneous brazed joint improves the metallurgical reaction of the joint seam, avoids excessive reaction of interfacial elements, and achieves a brazing strength that is significantly superior to existing technologies, showing broad application prospects.

A method for preparing thick plates from Ti80 titanium alloy EB flat ingots by single-fire direct rolling is disclosed. The method involves selecting Ti80 titanium alloy EB flat ingots, heating them through multi-stage temperature control, and then performing single-fire rolling. The rolling process involves coordinated control of heating temperature, deformation, and phase transformation. Finally, the plates undergo straightening and annealing. Under conditions where the total deformation in a single-fire rolling process is 65-93%, Ti80 titanium alloy plates with excellent shape and a thickness of 15-125 mm are obtained. The mechanical properties of the Ti80 titanium alloy thick plates produced by this invention meet the requirements. Furthermore, this invention eliminates the need for multiple forging processes involving vacuum consumable arc melting of Ti80 titanium alloy round ingots, shortening the process flow and production cycle, reducing production costs, and increasing the yield to over 70%, making it suitable for industrial production.

The invention discloses a resistance thermal additive manufacturing method and device for a large-size nano nickel component, and belongs to the technical field of nano material preparation, the manufacturing method comprises the steps that nano nickel powder is laid on the surface of a substrate to form a nano nickel powder layer or the nano nickel powder is pressed into a nano nickel powder plate to be placed on the surface of the substrate; the nano nickel powder layer or the nano nickel powder plate is subjected to resistance thermal additive manufacturing, gaps of the nano nickel powder and the contact area of the nano nickel powder and the substrate are selectively melted through the resistance thermal effect to form metallurgical bonding, meanwhile, the nano structure in the nano nickel powder is reserved, and a single-layer nano nickel component is obtained; and the single-layer nano-nickel component is subjected to multi-layer resistance thermal additive manufacturing, and the large-size nano-nickel component is manufactured. According to the method, the problem that the performance of the prepared component is remarkably reduced due to the fact that a traditional laser / electric arc melting additive manufacturing technology destroys the nano structure is fundamentally solved, and the centimeter / decimeter-level nano nickel component can be prepared at low cost.

The invention discloses a method for improving the performance of a TA4-0. 1B titanium material, and belongs to the technical field of titanium metal material preparation. The oxygen content of the TA4-0. 1B titanium material is controlled to be 0.2-0.4 wt%, and the TA4-0. 1B titanium material contains B with the fixed addition amount being 0.1 wt%, and the balance Ti and inevitable impurities. In the preparation process, TiO2 powder and TiB2 powder are wrapped by pure titanium foil to form a plurality of material bags, the material bags are divided into three equal parts, and sponge titanium is divided into four equal parts; raw materials are sequentially filled in a layered manner according to a manner of'titanium sponge, material package, titanium sponge, material package, titanium sponge, material package and titanium sponge 'and are pressed into columnar material blocks as consumable electrodes. The obtained electrode block is smelted twice through a vacuum self-consuming electric arc smelting furnace, a TA4-0. 1B-xO alloy cast ingot with uniform components is obtained, and the TA4-0. 1B-xO alloy cast ingot is machined through an ingot casting machine and subjected to non-forging direct rolling to form a plate; through fixation of the B content and graded regulation and control of the oxygen content, balance between high strength and high plasticity is achieved, and the yield ratio of the alloy can be effectively improved through coordinated regulation and control of the two elements, so that the application of TA4 titanium materials in the fields of aerospace, medical implants, high-strength structural parts and the like is expanded.

The invention relates to the technical field of thermal spraying, in particular to an arc-assisted plasma spraying method and device, and the method comprises the following steps: selecting wires of corresponding materials and specifications according to spraying requirements; the two sets of wires are oppositely arranged and fed into a to-be-sprayed area, and the wires are melted through auxiliary electric arcs; a main arc is utilized to excite gas to form plasma, and the plasma blows away the molten wire; and the molten wire blown away by the plasma is sprayed to a workpiece to be sprayed. The device is convenient to use, high in energy utilization rate, low in energy consumption, high in processing efficiency, simple in structure and high in reliability.

The invention discloses a preparation method of a large-size copper-titanium intermediate alloy consumable electrode bar, which comprises the following steps of: weighing electrolytic copper powder and sponge titanium according to the weight percentage, and mixing in a double-roll spiral mixer to obtain a mixture; filling the mixed material into a rubber sleeve for heading powder, putting the rubber sleeve subjected to heading powder into a cold isostatic press, and carrying out blank pressing by adopting a steel sheath to obtain a pressed blank body; loading the pressed green body into a V-shaped graphite clamping groove, and sintering in a vacuum sintering furnace to obtain a sintered green body; and S4, vacuum self-consuming arc melting: taking the sintered green body as a self-consuming electrode and filling the self-consuming electrode into a vacuum self-consuming arc melting furnace for melting. According to the preparation method, electrolytic copper powder and sponge titanium are taken as raw materials, a large-specification electrode bar is prefabricated by adopting a cold isostatic pressing process and a vacuum degassing process, and the large-specification copper-titanium intermediate alloy which is low in gas content, uniform in structure, free of segregation, high in performance and large in specification is prepared through a vacuum consumable electric arc melting process.

This invention discloses a method for growing superconducting RCoC2 single crystals. The method includes: S1, preparing materials according to the stoichiometric ratio of R, Co, and C elements, with the total carbon input compensating for 3%-5% relative to the stoichiometric ratio of RCoC2. The carbon source consists of C blocks and C powder, with the C powder accounting for 7%-15% of the total carbon source and having a particle size of 53-150 μm; S2, placing the raw materials in an arc melting furnace in the order of Co, C, and R, and adding an oxygen absorber; S3, evacuating and then filling with a protective atmosphere; S4, melting the raw materials under the protective atmosphere, flipping them over, and repeating the melting process; S5, cooling to obtain superconducting RCoC2 single crystals. This method can stably obtain millimeter-scale, non-centrosymmetric superconducting RCoC2 single crystals with an Amm² space group. When R is Y, the YCoC2 single crystal exhibits a superconducting transition at low temperatures, with a maximum superconducting transition temperature of 3.7 K. This single crystal can be used to prepare superconducting materials, samples for low-temperature transport research, or samples for topological superconductivity research.

The invention discloses automatic feeding electric arc heating precasting equipment and method, and relates to the field of alloy preparation. The problems that according to an existing vacuum non-consumable electric arc melting technology, due to inherent uneven thermal field, weak molten pool stirring and difficult process regulation and control, the prepared high-temperature alloy cast ingot is coarse in structure, composition segregation exists, and elements are burnt out are solved. Materials enter a water-cooled copper crucible, and first-time electric arc melting is achieved on metal through upper electric arc melting; the crucible is dumped rightwards into a disc prefabricated in the middle through a rear overturning device, and secondary smelting is carried out; and after secondary smelting, metal liquid flows into the rightmost water-cooling copper crucible through a right outflow opening of the disc, the alloy solidification process can be effectively regulated and controlled in cooperation with electric arc smelting treatment above, alloy component distribution is improved, then the structure is regulated and controlled, and the purpose of greatly improving the alloy performance is achieved. The method is used for preparing the high-temperature active alloy which is high in melting point and difficult to melt.

The application discloses a dense MnCoSi-based giant magnetostrictive material, which is composed of MnCo 1‑x Pt x Si, belongs to the field of magnetostrictive material preparation, and comprises the following steps: designing a MnCo 1‑x Pt x Si material system by partially replacing Co in the MnCoSi material with the element Pt, and then preparing a dense alloy ingot by arc melting under the protection of an argon atmosphere. The application adjusts the martensitic transformation temperature of the MnCoSi material by changing the content of the doped Pt, so that the martensitic transformation is eliminated, the dense MnCoSi-based material without macroscopic cracks is obtained, and the material maintains a large room-temperature reversible magnetostrictive effect, which is helpful to promote the practical application of the giant magnetostrictive material.

The present invention relates to the technical field of titanium alloy processing, and discloses a method for preparing a superconducting NbTiTa alloy ingot, comprising: mixing niobium powder and tantalum powder in a weight ratio of Nb:Ta=3:1, isostatically pressing and vacuum sintering the mixed material to obtain a NbTa sintered rod; subjecting the NbTa sintered rod to vacuum electron beam melting twice to obtain a Nb25Ta ingot; heating the Nb25Ta ingot to 300°C and holding the temperature for more than 2 hours to forge the Nb25Ta rod; determining the Nb content according to the measured composition of the Nb25Ta rod. The raw materials for the TiTa alloy and the NbTiTa alloy include at least: Nb25Ta rods, titanium sponge, and a TiTa mixed powder or a TiNb mixed powder. The titanium sponge and the TiTa mixed powder or the TiNb mixed powder are laid and pressed to form a titanium electrode block, wherein a groove is formed at the centerline of the upper surface of the titanium electrode block and runs through the opposite ends of the block. Multiple titanium electrode blocks and Nb25Ta rods are assembled and welded to form a rod-shaped consumable electrode. The consumable electrode is then subjected to three vacuum consumable arc melting processes to obtain a NbTiTa alloy ingot. This application achieves the purification of the alloy and the precision of its composition.