110 results about "Gas protection" patented technology

This utility model relates to the field of titanium alloy welding and discloses an auxiliary device for gas protection in titanium alloy MIG welding. The device includes a cover, with auxiliary plates on both the left and right sides of the bottom surface of the cover, rubber components on both sides of the cover, a mounting ring fixedly connected to the top of the cover, and a gas supply assembly on the upper part of the cover. Multiple ball bearings are rotatably connected to the bottom of the auxiliary plates, and a mounting groove is formed in the middle of the auxiliary plates. A mounting plate is fixedly connected to the bottom surface of the cover, and the mounting plate is movably connected to the mounting groove. Multiple bolts are threadedly connected between the mounting plate and the mounting groove. In this utility model, the interaction between the cover, auxiliary plates, ball bearings, and other components effectively reduces friction during cover movement. Furthermore, the interaction between the mounting plate, mounting opening, and bolts makes the auxiliary plate easier to replace and more practical.

The utility model provides a quick -acting type magnetic control switch relates to magnetic control switch technical field, including drive assembly, drive assembly includes cylinder and first installation shell, cylinder sets up in first installation shell, adjustment assembly includes movable block, fixed plate, first spring, first magnetic attraction board, second magnetic attraction board, input wire, connecting plate, movable rod, limit slot, fixed column, third magnetic attraction board, second spring, fourth magnetic attraction board, output wire and second installation shell, the utility model discloses when the action of magnetic control switch, cylinder pushes movable block and drives fixed plate, and magnetic attraction board power -on generation suction, and spring energy storage, and movable rod transmission makes magnetic attraction board mesh power -on, and output wire power supply, after inductor triggers, cylinder recycles, and another group of magnetic attraction board mesh drive air pump, and send mixed inert gas to contact point anti -electric arc through drainage groove, whole course gas protection, and the cooperation of component guarantees stable fast, and the life and security under high load scene are 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.

This invention discloses a tungsten inert gas (TIG) shielded welding method and argon protection system for 5083 aluminum alloy pipes. The system includes an argon source, an argon pressure regulating component, a flow regulating component, and a low-emission polymer material gas delivery hose. One end of the gas delivery hose extends into the 5083 aluminum alloy pipe to be welded, supplying gas to the back area corresponding to the weld root. The welding method includes machining a single-sided V-groove at the pipe end, forming a root gap by butt welding, performing argon gas replacement, and using TIG shielded welding for the root pass. During welding, argon gas diffuses through the root gap to the back of the molten pool, achieving back-side protection and assisting in the removal of oxide impurities and fumes. This invention can reduce the risk of argon gas transport contamination, reduce weld shadow defects, improve the stability of the back-side formation of the root pass, and increase welding efficiency.

The application discloses a titanium alloy and niobium alloy dissimilar metal laser welding method, and belongs to the technical field of dissimilar metal welding. The method comprises the following steps: treating the surfaces of titanium alloy and niobium alloy to be welded; assembling the treated titanium alloy and niobium alloy by adopting an asymmetric thinning lock bottom structure to form a closed lock bottom cavity; arranging a back protective gas path below the surface to be welded and arranging a front protective cover above the surface to be welded to form a double-face gas protection device; clamping the workpiece in a self-adaptive clamp and applying a pre-tightening force to position the workpiece; presetting a scanning path of a laser beam; adopting a continuous fiber laser to make the laser beam perform a welding operation along the preset scanning path to complete main welding and perform targeted remelting treatment along the surface of the weld; continuously inputting protective gas after welding to slowly cool to room temperature; and performing stress relief heat treatment on the welded joint. The application realizes high-quality laser welding of the titanium alloy and the niobium alloy, has high joint strength, excellent surface quality and no oxidation defects, and does not need a vacuum environment, and is flexible in process and controllable in cost.

This invention discloses an integrated device and control method for multi-level protection and dust extraction in high-power laser welding. The device includes a housing with a nozzle, an air inlet, and a dust extraction pipe installed at the bottom. Inside the housing are a main protection channel and a dust extraction channel communicating with the nozzle. One end of the dust extraction channel is connected to the dust extraction pipe, and the other end is connected to the inside of the suction nozzle. A dust extraction module communicating with the channels is located inside the housing. Temperature sensors, dust measurement sensors, and vibration sensors are mounted on the housing. A radar detector is located on the upper part of the housing. A rear protection channel is formed between the nozzle and the side wall of the housing. The air inlet communicates with a gap channel. The inside of the suction nozzle and the dust extraction channel form a Venturi suction structure. A fly-blocking layer is located above the dust extraction pipe on the housing. The dust extraction pipe is rotatably connected to the housing. This invention achieves comprehensive control and optimization of the welding process through the integration of multi-level gas protection, real-time monitoring, and dynamic dust extraction.

The utility model relates to metal casting technical field, concretely discloses a kind of smelting device of cast copper alloy, including U-shaped seat and furnace body, the outer wall of furnace body is fixedly connected with two rotationally connected shafts with U-shaped seat, the outer wall of two The shafts are fixedly connected with carousel, the outer wall of U-shaped seat is provided with discharge mechanism, the inside of furnace body is provided with stirring mechanism, the upper end surface of furnace body is provided with furnace cover, the inside of furnace cover is provided with air cavity, the lower end surface of furnace cover is provided with multiple evenly distributed and with air cavity communication air hole, the upper end surface of furnace cover is installed with the air pump of outlet port and air cavity communication, the air inlet of air pump imports inert gas;Efficient mixing of melt is realized by the bidirectional differential stirring mechanism driven by bevel gear set, cooperate the inert gas protection system of furnace cover air cavity and tiltable discharge mechanism, while improving alloy uniformity, effectively control oxidation, realize the integrated smelting production of high-quality copper alloy castings.

This invention discloses a pipe welding device and method, belonging to the field of pipe welding technology. It mainly includes a support and guide assembly, a displacement clamping assembly, a welding assembly, a shielding assembly with a deformable drag shield, and a drive assembly equipped with a main drive shaft, a rigid cam, a flexible cam, and an overload friction structure. The main drive shaft drives the two cams to synchronously press the deformable drag shield. When the drag shield abuts against the pipe wall, generating a reverse torque greater than the maximum static friction torque, the flexible cam slips and stops rotating via the overload friction structure, while the rigid cam continues to press down. The dynamic differential stroke formed on both sides forces the deformable drag shield to flexibly bend and adaptively and tightly conform to different pipe walls. This invention solves the defects of traditional rigid drag shields, such as fixed curvature, frequent replacement of spare parts, and air leakage. It achieves automatic morphological wrapping of multi-specification pipe fittings and high-quality flexible laminar gas protection, improving welding efficiency.

The application discloses a composite electric contact and a preparation method thereof. The preparation method comprises the following steps: mixing graphite powder and a binder to obtain a composite graphite material; mixing copper powder and a metal auxiliary material to obtain alloy powder; mixing the composite graphite material and the alloy powder to obtain mixed powder; performing hot-pressing forming treatment to obtain a formed blank; then, performing sintering, wherein the sintering temperature is first increased to 600-850 DEG C and kept for 1-4 hours, then increased to 900-1050 DEG C and kept for 1-4 hours, and then cooled to 30-90 DEG C by gas protection or vacuum protection, so as to obtain a contact blank; and processing the contact blank and a base to obtain the composite electric contact. The composite electric contact prepared by the method has excellent electric conductivity, high mechanical strength and good fatigue resistance, and is suitable for high-performance contact application in electrical switches, relays and other electrical equipment.

The present application relates to the technical field of welding material, in particular to a high-toughness gas shielded welding wire and a preparation method thereof.The welding wire comprises a low-carbon steel belt sheath and a flux cored powder, and the flux cored powder comprises reduced iron powder, manganese powder, carbonyl nickel powder, molybdenum powder, titanium powder, silicon powder, graphite powder, rutile titanium dioxide, calcium fluoride, potassium fluorotitanate and cerium-aluminum co-doped microparticle powder; the cerium-aluminum co-doped microparticle powder takes calcium-rich borosilicate as a core, is treated by isopropanol aluminum hydrolysis polycondensation sealing, aluminum oxide nanoparticle enhancement, aluminum nitrate-colloidal silicon dioxide bridging and cerium nitrate outer layer, and is prepared; the welding wire is suitable for high-strength steel thick plate multi-layer multi-pass gas shielded welding, can improve low-temperature impact toughness and refine inclusions while maintaining high deposited metal strength.

The utility model discloses a kind of planetary multi-shaft grinding cavity structures, detachable connection between tank cover and tank body support sleeve shaft and tank body makes that cleaning and maintenance are more convenient, it is also convenient to replace or adjust internal component simultaneously, the design that grinding blade assembly is movably connected with tank body support sleeve shaft can ensure in operating process, blade can automatically adjust position or angle according to the state of material, to improve grinding efficiency and uniformity, pressure gauge on tank cover can monitor and adjust the pressure in tank in working process, prevent the security risk caused by excessively high pressure, ensure the safety of operation, the existence of air inlet pipe and air outlet pipe means that the device can operate in different gas environment, such as under inert gas protection to handle air-sensitive material, or by introducing specific gas to promote certain chemical reaction, greatly improve the controllability and application range of device.

The utility model relates to a laser welding self-resetting shielding gas support, and belongs to the field of welding machining. The laser welding self-resetting shielding gas support is used for conducting gas protection on peripheral weld joints of a ship heat exchanger. The laser welding self-resetting shielding gas support comprises a first mounting frame, a gas protection cover and an elastic piece. The first mounting frame is connected with the laser welding mechanism, is positioned at the downstream of the laser welding mechanism and is provided with a mounting end; the gas protective cover is rotatably arranged at the mounting end, the gas protective cover is provided with an opening side deviating from the first mounting frame, the opening side is a curved surface, and the curvature radius of the opening side is larger than that of the peripheral side of the ship heat exchanger; the elastic part is located between the mounting end and a welding gun of the laser welding mechanism in the first direction, the two ends of the elastic part are connected with the gas protective cover and the first mounting frame correspondingly, and the elastic part is configured to provide elastic force for the gas protective cover so as to drive the gas protective cover to rotate around the mounting end, so that the opening side can be attached to the peripheral side of the ship heat exchanger.

The application discloses a preparation method of an antioxidant lead-free tin-based solder alloy for high temperature, and belongs to the technical field of solder alloy production processes. When the solder alloy is prepared by the method, elements in raw materials include the following in percentage by mass: 88-95% of Sn, 1-4% of Ag, 0.5-3% of Bi, 0.1-1% of Y, 0.05-0.2% of Hf, and the balance is inevitable impurities. The preparation method of the solder alloy is as follows: after metal raw materials are pickled and dried, Sn is first smelted and kept warm under inert gas protection, then Ag and Bi are added, stirring and heating, Y and Hf are further added and ultrasonic smelting is conducted; after a deoxidizing agent is added and reacts, the solder alloy is placed and slag is removed; three-stage refining is conducted through plasma atomization, high-low frequency ultrasonic treatment and a pulse ultrasonic conversion system; finally, the solder alloy is cooled, sieved and annealed to obtain the solder alloy. The application combines plasma technology, gas atomization and ultrasonic technology, realizes preparation of a tin-based solder alloy with uniform composition, high oxidation resistance and excellent mechanical properties, and meets the needs of the electronic welding field under high temperature environment.

This invention discloses a method and apparatus for synchronous laser forming of wire and powder with constant-volume loading of dual-scale particles, relating to the fields of metal additive manufacturing and laser welding technology. The method includes the following steps: induction heating of the surface of a continuously fed metal wire to induce transient micro-melting and softening of its surface layer, forming an activation layer; sequentially embedding nano-sized and micron-sized particles into the activation layer according to a preset ratio and order, so that the dual-scale particles are layered and composited on the wire surface; using an adjustable mechanical constraint structure to perform sizing scraping on the composite wire surface, precisely limiting the particle load volume per unit length of wire; continuously feeding the constant-volume loaded composite wire into a laser melting pool, and achieving synchronous melting and deposition forming of the wire and particles under an inert gas protective environment. This invention can achieve constant-volume and quantitative loading of dual-scale particles on the wire surface, effectively ensuring the uniformity of the microstructure and properties of complex structures.

The application discloses a steel structure inverter gas shield welding machine, and relates to the technical field of welding equipment. In view of the problem that the existing steel structure inverter gas shield welding machine is poor in arc striking quality and arc collecting and sticking due to welding wire shaking during starting and stopping, the following scheme is provided, which comprises a welding host, an installation frame is fixedly connected to the outside of the welding host, a wire winding wheel is arranged on the installation frame, a welding wire is arranged on the wire winding wheel, and one end of the welding wire, which is away from the wire winding wheel, is located outside the installation frame. The steel structure inverter gas shield welding machine can eliminate the rigid impact of the welding wire during starting, realize soft starting and avoid the phenomenon of explosion breaking during the arc striking stage of welding, so that the arc striking success rate is significantly improved in the scene of high-frequency spot welding and robot automatic welding, and the welding wire end head is accurately kept at the outlet position of the conducting nozzle of the welding gun during the arc collecting stage, so that the conducting nozzle is prevented from being burned or the wire feeding is prevented from being stuck due to the welding wire retraction during the next arc striking.

Systems and methods for operating a welding power supply are disclosed. A method may include operating the welding power supply during a short arc welding process having repetitive cycles each including a short circuit phase and an arc phase, during the short circuit phase, causing a fast ramp up of current from a background current level to a predetermined current level, and upon reaching the predetermined current level, slowing the fast ramp up of the current to a relatively slower ramp up of current until the arc phase begins, wherein the predetermined current level is set based on a percentage of a current level detected at a transition between the short circuit phase and the arc phase in at least one prior cycle.

The welding module and automatic welding equipment of the present invention relate to the field of welding technology. The welding module is used to weld gaps to be welded and includes a base, a gas protection device that sprays protective gas in parallel along a first direction to form a protective gas-enclosed space, a bent tungsten electrode disposed within the protective gas-enclosed space, a swinging device for driving the bent tungsten electrode to swing, and a wire feeding device. The gas protection device is disposed on the base. The bent tungsten electrode is used to form a molten pool at a predetermined position within the gap to be welded. The wire feeding device is used to transport welding wire into the molten pool. The protective gas sprayed along the first direction provides gas protection for the bent tungsten electrode, the gap to be welded, and the molten pool. This improves the adaptability of the product to the narrowness of the gap to be welded; furthermore, the single-channel parallel delivery of protective gas greatly simplifies the product structure; and secondly, the absence of a flat torch shell improves the ease of observation.

The application discloses an inner hole additive connection method suitable for inner holes of complex structural parts. The inner hole additive connection is carried out in a vacuum or inert gas protection environment, so that oxidation pollution of powder and a molten pool can be effectively prevented, and chemical composition and metallurgical continuity of a connection area are ensured. Raw material powder is consistent with base material composition, and reasonable V-shaped groove and root gap design are matched, so that the molten pool is stable, the interface is dense, a continuous and uniform grain structure is formed in the connection area, and the generation of pores and un-melted defects is reduced. Multi-axis pose, laser power and powder feeding rate cooperative control technology can ensure molten pool morphology consistency and forming precision of the inner hole connection, and effectively reduce local residual stress and warping deformation.

This utility model discloses a gas shielded welding device with a bidirectional wire feeding mechanism, belonging to the field of gas shielded welding. It includes a protective shell and a welding torch body. A gas cylinder is fixedly connected to the top of the protective shell, and a flexible hose is fixedly connected to the top of the gas cylinder. A protective tube is fixedly connected to the top of the welding torch body, and a nozzle is provided on the outside of the protective tube. The other end of the flexible hose is fixedly connected to the inside of the nozzle. A fixing plate is fixedly connected to the inner wall of the top of the protective shell. Two rotating rods are rotatably connected to the bottom of the fixing plate, and a numbered block is rotatably connected to the other end of each rod. Multiple guide frames are fixedly connected to the bottom of the fixing plate. This utility model has a reasonable structural design. Through the cooperation between the connecting rods, rotating rods, and the vertical plate, the user can adjust the height of the rollers. This allows the spacing to be increased to prevent jamming when the welding wire expands, and decreased to prevent slippage when the welding wire contracts. This improves wire feeding stability and facilitates normal use by the user.

The application discloses a beryllium window device with gas and water cooling protection, which is characterized by comprising a water cooling beryllium window and a gas beryllium window protection device; the gas beryllium window protection device comprises a Kapton film, two gas pipelines and a terminal flange; a fixed flange on the atmospheric side of the water cooling beryllium window is connected with the terminal flange, the Kapton film is installed in a knife edge of the fixed flange; two through holes are arranged on the side wall of the fixed flange and are respectively in sealed connection with the gas pipelines, one of the gas pipelines is used for connecting cooling air to cool beryllium sheets in the water cooling beryllium window, and the other gas pipeline is used for discharging gas to form air cooling circulation. On the basis of the water cooling beryllium window, a set of gas protection device is added, and the service life of the beryllium window can be prolonged by means of air cooling, and the harm of beryllium oxidation to the human body can be avoided.

A metal inert gas arc welding process in which a multi-wire welding torch (40) is mechanized along a path to execute a predetermined weld seam on a workpiece (32, 100a, 100b, 101a, 101b), and in which a first arc (51) is generated between a first consumable wire electrode (50) and the workpiece, and a second arc (61) is generated between a second consumable wire electrode (60) and the workpiece to transfer wire electrode material into a weld pool, wherein the first wire electrode (50) is supplied by a first power source (4) and the second wire electrode (60) by a second power source (6), and at least a third wire (70) is fed directly into the weld pool, wherein the first and second wire electrodes (50, 60) and the third wire (70) are guided in the multi-wire welding torch (40) such that the wires exiting the multi-wire welding torch (40) (50, 60,70) essentially lie in a common plane (GE) and that in the common plane the first wire electrode (50) and the second wire electrode (60) form an angle of equal magnitude with opposite signs to the third wire (70), characterized in that, during the execution of the metal inert gas arc welding process, starting from a predetermined direction of movement of the multi-wire welding torch (40) to the path line, the multi-wire welding torch (40) is moved backwards on the path line without rotation of the multi-wire welding torch (40) to perform a reversal of movement, and with the beginning of the backward movement of the multi-wire welding torch (40), the third wire (70) is initially not fed into the weld pool, and thereafter, in a transition phase, a current source (5) of the third wire (70) is supplied starting from a predetermined initial operating value of at least one process parameter current,Voltage and feed rate are controlled to a predetermined steady-state operating value of at least one process parameter.

This application discloses a crusher for processing spheroidizing agents in as-cast high-toughness ductile iron alloys, belonging to the technical field of spheroidizing agent processing equipment. It mainly includes a processing table, with a support frame mounted on the top surface of the processing table. Inside the support frame is a crushing device for processing spheroidizing agents in as-cast high-toughness ductile iron alloys. The crushing device includes a crushing chamber, with an air inlet assembly for introducing nitrogen gas installed at the top and an exhaust pipe installed at the bottom. Through the combined design of the top air inlet assembly, the ring pipe, and the downward-sloping air inlet branch pipe, an external nitrogen source is introduced into the crushing chamber through the main air inlet pipe, forming a top-down inert gas protective layer inside the chamber. This rapidly replaces the oxygen inside the chamber, reducing the oxygen concentration to an extremely low level, effectively isolating active elements such as magnesium and rare earth elements in the spheroidizing agent from contact with air. Compared with traditional crushing equipment, this greatly reduces the loss of effective components, ensuring that the spheroidizing agent fully exerts its spheroidizing effect during the casting process and improving the quality of the castings.

The present application relates to the technical field of copper processing, and particularly relates to a spraying method of a roll surface anti-adhesion coating, which comprises the following steps: after cleaning the roll, performing sand blasting roughening treatment and cleaning, then preheating the roll to 80-90 DEG C; spraying a chromium alloy powder on the rotating roll surface to form a transition layer by using plasma spraying, and then tempering; preparing a composite powder comprising 70-80wt% ceramic phase powder, 20-30wt% anti-adhesion powder and 3-5wt% friction-reducing powder; performing axial gradient spraying of the composite powder on the surface of the transition layer by using plasma spraying, so as to obtain a functional layer which is thicker in the middle region than in the two end regions; performing gradient heat treatment on the roll under inert gas protection, and after cooling, performing grinding and polishing on the functional layer, so as to obtain a product; through reasonable material selection, gradient spraying process and appropriate heat treatment, the anti-copper adhesion performance, the bonding strength and the service life of the coating are effectively improved, so as to meet the use requirements of the roll for copper processing.

The application relates to the technical field of surveying equipment protection, and discloses a gas protection device for surveying equipment, which comprises a transparent cover body and a base, and the transparent cover body is mounted on the top of the base. The gas protection device for surveying equipment is provided with a HEPA filter layer, an activated carbon filter layer and a hydrophobic membrane filter layer. When air is exchanged, the HEPA filter layer can filter the particulate impurities in the gas, the activated carbon filter layer can filter the chemical gas in the gas, and finally, the hydrophobic membrane filter layer can prevent water vapor from flowing into the transparent cover body. Through the three-layer filter structure, the odor adsorption, particle filtration and waterproof triple protection can be realized. Meanwhile, through the detachable design of the sliding plate and the sliding groove, the filter layer can be quickly replaced, the maintenance cost is low, and under the action of the conical hopper and the exhaust fan, an air exchange system can be formed, the internal air pressure is slightly higher than the external air pressure, and the external pollution can be prevented from flowing in.

This invention discloses a forming system for large aluminum alloy castings without heat treatment, belonging to the field of aluminum alloy casting technology, and aims to solve the technical problem of cavitation that easily occurs during sand casting of large aluminum alloy castings. In the molten metal filling stage, the system adopts a combined design of "argon film pre-sealing + synchronous extraction," forming an inert gas protective layer on the cavity surface to extract volatiles from the source, eliminating porosity defects from the perspective of molten metal flow and purification. A silicon nitride ceramic jacket guides the molten metal filling, utilizing its high thermal conductivity to optimize the filling path and heat exchange of the molten metal, avoiding gas absorption and oxidation caused by local scouring disturbances. Furthermore, the system is equipped with easily collapsible sand cores and an automated cleaning module to achieve rapid demolding and continuous processing after casting. This invention significantly improves production efficiency, meeting the stringent requirements of mass production of high-strength, lightweight structural components made of die-cast aluminum alloys and high-end equipment.

This invention provides a follow-up clamping device for providing vortex gas to a laser welding head to protect the workpiece being welded. The follow-up clamping device includes: a clamping body having a conical inner cavity; a connecting member, one end of which is connected to the laser welding head; and an annular gas supply member, through which gas is introduced from the large opening side of the conical inner cavity, converges and forms a vortex-like converging airflow within the conical inner cavity, and is then ejected from the small opening side of the conical inner cavity, suitable for spraying towards the workpiece being welded. This invention solves the problems of unstable gas protection and the existence of protection dead zones in existing technologies, as well as the problem of severe plasma shielding effects affecting welding depth and energy transmission in existing technologies. It also solves the problem of existing laser welding clamping mechanisms obstructing airflow and causing protection blind zones.

The application discloses a device and method for realizing in-situ manufacturing of one-time forming of copper-steel-copper clad alloy through solidification process control, and belongs to the field of electric arc additive manufacturing. The device is mainly composed of a MIG welding gun, and a coaxial powder feeding and auxiliary heat source regulating device are innovatively integrated. Fe-based welding wire is used as a structural skeleton material in the central channel, and a powder feeder near the welding wire precisely delivers Cu-based powder as a functional cladding layer through argon. The outermost layer is a gas protection system, which avoids the interference of protective gas turbulence on the transport track of copper powder. Meanwhile, a TIG heat source is introduced to realize a rear dynamic temperature regulating technology. After the material cladding is completed by the MIG main arc, the deposited layer is subjected to secondary heat field intervention by the rear TIG arc, so as to provide sufficient kinetic conditions for Cu liquid phase migration. The method ensures that the liquid copper sufficiently migrates to both sides of the molten pool under the driving of surface tension and Marangoni convection, forms a gradient cladding structure with uniform thickness, and improves the microhardness of the interface area.

The application relates to the technical field of target materials, and provides a CrCuAg alloy target material for antibacterial plating and a preparation method thereof, wherein the preparation method comprises the following steps: mixing Cr powder, Cu powder and Ag powder under the protection of inert gas to obtain mixed powder through mechanical ball milling; filling the mixed powder into a can, and the relative density of the filled can is greater than or equal to 55 %; performing vacuum thermal degassing on the filled can; performing hot isostatic pressing liquid phase sintering on the can after the vacuum thermal degassing is completed to obtain a CrCuAg alloy target material blank; and removing the can from the CrCuAg alloy target material blank to obtain the CrCuAg alloy target material. Through the synergistic design of the specific particle size grading and the hot isostatic pressing liquid phase sintering process, the densification problem caused by the large melting point difference of Cr, Cu and Ag is solved, the high-performance antibacterial alloy target material with a relative density greater than 99 % can be prepared, and the Cr substrate has high hardness and wear resistance and the Cu and Ag have the synergistic antibacterial function.

This invention discloses a high-martensite-content, pitting-resistant NiTi alloy and its laser powder bed melting preparation method and application, belonging to the technical fields of nickel-titanium shape memory alloys, additive manufacturing, and material corrosion protection. The method involves: under inert gas protection, LPBF forming is performed using a laser with a power of 180–220 W, a scanning speed of 1085–1325 mm / s, and a scanning spacing of 80–100 μm to form an austenitic structure with orientation characteristics; subsequently, a medium-temperature annealing treatment is performed at 500–550 °C for 180–240 min to induce the austenite to transform into martensite and inherit the orientation characteristics, achieving a martensite content of 42–55%, while simultaneously promoting the uniform distribution of nano-precipitates. The prepared alloy can effectively reduce electrochemical inhomogeneity, significantly improve pitting corrosion resistance in chlorine-containing environments, and has an overpassivation potential of 1300–1600 mV, exhibiting both good functional properties and promising engineering applications.

This invention provides a high-purity biomedical material melting and casting equipment and process, relating to the field of melting and casting device technology. It includes a furnace body, a cooling device, a mold device, and a lifting device. The furnace body includes an outer crucible and an inner crucible, with a filtration mechanism inside the inner crucible and a discharge port below the filtration mechanism. The cooling device includes a cooling jacket and a cooling plate located below the cooling jacket. The mold device includes a forming mold, which is mounted on the cooling plate and its top passes through the cooling jacket. The lifting device is connected to the cooling plate. This invention melts, casts, and shapes magnesium ingots under inert gas protection, effectively preventing oxidation. The filtration mechanism effectively removes metallic impurities and oxide inclusions, resulting in a clean and dense high-purity magnesium rod. The cooling method using a cooling jacket and cooling plate effectively reduces the ingot grain size, homogenizes the microstructure, reduces segregation, improves mechanical properties, and ensures product quality. Multiple molds can also be cast simultaneously, resulting in high production efficiency.