46results about How to "Dense tissue" patented technology

The present invention relates to a device and method for controlling the edge precision of a stir friction extrusion solid-phase additive deposition layer, which belongs to the field of additive manufacturing technology, and includes a hollow stirring head, which can rotate, and a through hole is arranged at the central axis thereof for filling raw materials; four split sleeves are sleeved around the hollow stirring head, and the four split sleeves can move up and down independently. The present invention restricts the side wall forming of the additive layer, suppresses the generation of flash, arc-shaped side walls and semi-cylindrical materials at both ends of the additive layer, thereby reducing the subsequent cutting amount and achieving near-net forming of the component; by restricting the flow of plasticized material to the surroundings, the additive layer at the center and the edge is made denser, and the mechanical properties of the additive layer as a whole and the side wall are improved; it can realize multi-layer additives in the vertical plane and multi-pass additives in the horizontal plane, and can also realize precise forming of the side wall without changing the device, thereby improving the flexibility of the device.

The invention relates to a die-casting forming method for improving the density of a casting, belongs to the technical field of aluminum alloy casting, and solves the problems of high porosity, low density and low mechanical property of an aluminum alloy thick-wall die casting in the prior art. A die-casting forming method for improving the density of a casting comprises the following steps that firstly, an aluminum alloy metal raw material is added into a preheated smelting furnace, melting and heating are conducted, aluminum alloy liquid is obtained, and a refining modifier is added and stirred; 2, degassing treatment is conducted on the aluminum alloy liquid, and surface scum is removed after standing; 3, a die-casting die is preheated, and a layer of release agent is sprayed on the die-casting die; 4, the molten aluminum alloy is cooled and poured into a pouring gate of the die-casting die, the thickness of the pouring gate is 8-12 mm, and the molten aluminum alloy is slowly injected into a cavity of the die-casting die through an injection punch; and 5, the aluminum alloy die casting is taken out, the die casting is placed in a water tank to be quenched, and the high-density die casting is obtained. And preparation of the high-density aluminum alloy thick-wall die casting is achieved.

The invention discloses a process for processing a corrosion-resistant aluminum alloy pipe through laser cladding, which comprises the following steps of: performing laser cladding on a formed aluminum alloy pipe, transmitting a laser beam to the surface of the aluminum alloy pipe, conveying cladding layer powder / alloy wires to a laser area, quickly melting the cladding layer powder / alloy wires and the surface of the aluminum alloy pipe together through the laser beam, and solidifying, thereby obtaining the corrosion-resistant aluminum alloy pipe. The cladding layer combined with the aluminum alloy pipe is formed on the surface of the aluminum alloy pipe, cladding layer powder / alloy wires are made of zinc or zinc alloy, the cladding layer serves as a sacrificial anode, a thin and compact oxide and hydroxide layer is formed on the surface of the aluminum alloy pipe, further oxidation reaction is effectively prevented, and the corrosion resistance and reliability of the aluminum alloy pipe are improved. And the laser cladding procedure can be accurately controlled by controlling the laser power of the laser beam, the spot diameter, the passing speed of the aluminum alloy pipe and the speed of conveying cladding layer powder / alloy wires, so that the cladding layer has the advantages of being small in dilution degree, compact in structure, good in combination with the aluminum alloy pipe and not prone to falling off.

The invention belongs to the technical field of casting, and particularly relates to a method for preparing a water-soluble composite salt core based on a slurry direct-writing forming 3D printing technology. A water-soluble composite salt core material for low-melting-point alloy casting is composed of pretreated water-soluble inorganic salt, a binder and an additive, the pretreated water-soluble inorganic salt is obtained by mixing a coating solution and inorganic salt powder, and the mass percent of the coating solution and the inorganic salt powder is 100%. The ratio of the pretreated water-soluble inorganic salt to the binder to the additive is (60-80%): (20-30%): (0-10%). Compared with a traditional method for preparing a water-soluble salt core, the water-soluble composite salt core material has the advantages that the water-soluble salt core formed through slurry direct writing can be used for rapidly forming parts without a mold, the process is simple, the raw material cost is low, the equipment requirement is low, and rapid and accurate mold-free forming of high-precision complex salt cores can be achieved; the problem that complex salt cores are difficult to integrally form is solved.

The invention discloses an electromagnetic auxiliary pressurization aluminum alloy lost foam casting forming device and method.The device comprises an electromagnetic pressurization module and a lifting device module, a liftable electromagnetic coil is placed outside a sand box, during pouring, three-phase alternating current is supplied to the electromagnetic coil, a coil winding generates a traveling wave magnetic field, and the electromagnetic pressurization module is connected with the lifting device module; molten aluminum generates induced current under the action of a traveling wave magnetic field, the electrified molten aluminum cuts magnetic induction lines in the pouring process to generate downward constant magnetic field force, flowing of aluminum alloy melt micelles in a cavity is greatly promoted, mold filling power is improved, the pouring speed is increased, mold filling is complete, the structure is refined and compact, pouring defects are greatly reduced, and the mechanical property of a casting is improved. After pouring is completed, the electromagnetic pressurization module is lifted under the action of the lifting device module, the sand box is transferred to a sand shakeout area for next technological operation, and the working efficiency is improved; the invention further provides an electromagnetic auxiliary pressurizing aluminum alloy lost foam casting forming method so as to reduce the casting defects of aluminum alloy castings and improve the mechanical property of the castings.

The invention belongs to the technical field of material additive manufacturing and surface engineering, and particularly relates to a process method for preparing an erosion-resistant layer on the surface of a high-speed pump diffuser runner opening. According to the method, a cold metal transition welding technology is adopted, cobalt-based alloy with high corrosion resistance is selected as a surfacing material and applied to the surface of the high-speed pump diffuser runner opening in a surfacing mode, an erosion-resistant surfacing layer which is free of metallurgical defects and high in hardness is constructed, and therefore the service life of a diffuser is effectively prolonged. According to the technological method, through precise welding parameter regulation and control and scientific selection of materials, the erosion resistance of the surface of the diffuser runner opening of the high-speed pump is remarkably improved, an efficient and reliable surface strengthening solution is provided for the industrial field, and the technological method has important technological innovation value and application prospects.

The application provides a wear-resistant composite piercing mill head manufacturing method and a piercing mill head, and the manufacturing method comprises the following steps: S1, preparing a steel base head; S2, adopting a submerged-arc welding process to make a flux-cored wire cladded on a working cone surface and a nose end surface of the steel base head, so as to form a cladding layer with a thickness of 6-8 mm; and S3, pre-oxidizing the cladding layer of the steel base head at high temperature, so that the wear-resistant composite piercing mill head is obtained. The wear-resistant composite piercing mill head manufacturing method has a dense and uniform oxide film on the surface of the cladding layer of the piercing mill head, the oxide film is firmly combined with the cladding layer, and the existence of the dense and uniform oxide film can reduce the power consumption of a steel pipe piercing mill and prolong the service life of the piercing mill head.

The invention provides an aluminum alloy bar reducing casting device and method, and relates to the technical field of casting, the device comprises a tundish, a crystallizer, a structure control device and a traction device; the structure control device is composed of a first sleeve and a cooling module, a reducing cavity is formed in the first sleeve, the inner diameter of the reducing cavity is gradually reduced from the first end to the second end, and the reducing cavity is used for cooling and solidifying the solid-liquid aluminum alloy bar; the traction device comprises a traction head forming die and a power device, the traction head forming die is located at the second end of the reducing cavity, and the power device drives the traction head forming die to move horizontally to pull out the aluminum alloy bar; through plastic deformation and cooling solidification in the reducing cavity, internal defects such as shrinkage porosity of the aluminum alloy are eliminated, grains are refined, and the structure is more compact and uniform; the traction force is improved through tight connection of the traction head and the bar, and the stability of the continuous casting process is enhanced; and the traction rate is accurately adjusted by the power device, so that the aluminum alloy bar which is compact in structure and small and uniform in grain size can be obtained.

The application discloses a device and method for discharging additive and subtractive materials by planetary electrodes, and relates to the technical field of electric spark deposition, which comprises a shell, a bottom end of a stirring head in a semispherical shape, a feeding cavity arranged in the stirring head, a feeding port arranged at a bottom of a side wall of the stirring head, a feeding pipe arranged at a top end of the stirring head, a first driving mechanism for driving the stirring head to rotate, the stirring head penetrating through a planetary carrier, a gap being arranged between the planetary carrier and the stirring head, an axis of the stirring head being parallel to or coinciding with an axis of the planetary carrier, the planetary carrier being arranged in the shell and being rotationally matched with the shell through a bearing, a gas feeding cavity being arranged in the planetary carrier, an air filling pipe being arranged at a top end of the planetary carrier, a second driving mechanism for driving the planetary carrier to rotate, a plurality of rotary motors being fixedly connected with the planetary carrier, a gas feeding channel and a gas outlet being arranged in each rotary electrode, and an electrode ring being fixedly arranged on an inner wall of the shell. The application can improve the compactness of a coating.

The invention belongs to the technical field of magnesium alloy processing, and particularly relates to a preparation method of a two-stage precipitation reinforced Mg-Zn-Cu high-thermal-conductivity wrought magnesium alloy. In the Mg-Zn-Cu alloy, the mass fraction of Zn and Cu is smaller than or equal to 4%, and the balance is Mg; the contents of Zn and Cu are equal; the preparation method comprises the following steps: smelting an alloy to obtain as-cast Mg-Zn-Cu; then, the as-cast Mg-Zn-Cu is subjected to repeated homogenization treatment for a plurality of times; the Mg-Zn-Cu subjected to homogenization treatment is subjected to hot extrusion deformation treatment, the extrusion angle is 90 degrees, the extrusion speed is 0.4 mm / s, the extrusion ratio is 25: 1, and the extrusion temperature is 220-240 DEG C; by setting the Zn / Cu ratio, low alloying, the extrusion temperature and the 90-degree extrusion angle, micron-scale and nano-scale precipitation strengthening is realized, and the thermal conductivity is balanced while the mechanical property is enhanced.

This invention relates to the field of electronic paste preparation technology, and discloses a low sheet resistance tungsten-copper electronic paste and its preparation method, comprising the following steps: Step 1, preparing tungsten-copper composite powder: spherical tungsten powder with a diameter of 1-10 μm and copper powder with a size of 1-3 μm are mixed by mechanical mixing, with a tungsten to copper weight ratio of 3:1-6:1. Before mixing, the copper powder needs to undergo graphene coating pretreatment; Step 2, preparing an inorganic binder: the inorganic binder includes, but is not limited to, the following components: glass powder, CuO, TiO2, La2O3, Pu6O11; Step 3, preparing an organic carrier: the organic carrier includes a solvent, an organic binder, and a thickener; Step 4, preparing the tungsten-copper paste. The tungsten-copper paste of this invention has widely available raw materials, a simple preparation process, and is suitable for mass production. Although graphene, a high-priced material, is added, the amount added is small and the performance is particularly excellent, making the cost of the tungsten-copper paste of this invention far lower than that of similar foreign products, resulting in a very high cost-performance ratio.

This invention discloses a method for producing 8011 aluminum alloy flat ingots using a graphite crystallizer, comprising the steps of graphite crystallizer preparation, smelting, casting, sawing, and milling. The graphite crystallizer uses graphite plates prepared by hot isostatic pressing, with a carbon mass fraction ≥99.9%, density 1.6–1.85 g / cm³, average graphite particle size <25 μm, thermal conductivity 80–130 W / (m·K), porosity 13–15%, and a graphite plate thickness of 10–20 mm and a height of 95–105 mm. The large-face water cavity of the crystallizer has a length of 2450–2550 mm and a height of 155 mm, while the small-face water cavity has a width of 500–670 mm and a height of 155 mm. The cooling water pressure is controlled at 0.25–0.50 MPa. This invention improves the production quality of 8011 aluminum alloy flat ingots, reduces the defect rate, extends the service life of the crystallizer, and increases production efficiency and product qualification rate by precisely optimizing the material and structural parameters of the graphite crystallizer and designing smelting, casting, sawing and milling processes that are compatible with 8011 aluminum alloy.

The invention relates to a high-toughness die-casting aluminum alloy for a new energy automobile and a preparation method of the high-toughness die-casting aluminum alloy, and belongs to the technical field of die-casting aluminum alloys. The preparation method of the high-toughness die-casting aluminum alloy for the new energy automobile comprises the following steps that after a 5-series aluminum alloy and an intermediate alloy are heated and molten, impurities are removed, and a molten alloy is obtained; performing pore-free pressure casting on the molten alloy to obtain a prefabricated aluminum alloy; and after the prefabricated aluminum alloy is subjected to high-temperature heat treatment, cooling heat treatment and normal-temperature cooling, the high-toughness die-casting aluminum alloy is obtained. According to the invention, the Mn and Zr elements are added to effectively refine crystal grains, air holes of a die casting are eliminated through a specific oxygenating die casting process, the aluminum alloy is compact in structure and free of blistering in high-temperature solid solution treatment, and the mechanical property of the alloy can be improved by adding the Mn and Zr elements for recrystallization and combining with ultrafine crystal grains of the oxygenating die casting process and large and coarse crystal grains of the Mg element; coarse grains keep deformability, superfine grains keep high strength, and the macroscopic mechanical property of the material is improved.

The application discloses a method for electron beam fuse additive manufacturing of beta titanium alloy components, and belongs to the technical field of additive manufacturing. The application aims to solve the problems of long preparation period, low efficiency, low utilization rate, serious oxidation, significant beta spot and poor strength and toughness of the prior art. The method comprises the following steps: pretreating the printing wire and the substrate; establishing a three-dimensional entity model based on the target beta titanium alloy component, performing slice processing on the three-dimensional entity model to generate multi-layer two-dimensional slice data, and then importing the slice data into an electron beam fuse additive manufacturing equipment, and setting a scanning path, preheating parameters and printing process parameters; starting the equipment and performing vacuumization, printing the beta titanium alloy according to the set printing parameters and procedures, completing all layers, and obtaining the beta titanium alloy component. The beta titanium alloy component prepared by the application has high density, and provides a reliable technical approach for the preparation of high-performance beta titanium alloy components in the fields of aviation and aerospace.

The invention discloses injection-casting high-Zn magnesium alloy based on a two-stage corrosion-resistant barrier and a preparation method of the injection-casting high-Zn magnesium alloy, and belongs to the technical field of magnesium alloy materials and metallurgy. Aiming at the corrosion resistance bottleneck caused by looseness of a surface film of the high-Zn system injection casting magnesium alloy and strong cathode activity of a second phase of a grain boundary, a new two-stage corrosion resistance barrier design thought is provided, and through main and micro element optimization design, injection casting forming process optimization and cooperative regulation and control of a precise heat treatment system, the high-Zn system injection casting magnesium alloy is obtained. And a two-stage corrosion-resistant barrier with a compact surface passivation layer and a fine net-shaped weak cathode phase is constructed. After the magnesium alloy prepared through the method is soaked in a 3.5 wt% NaCl solution for 7 days, the weight loss corrosion rate is smaller than or equal to 0.70 mm / year, the hydrogen evolution rate is smaller than or equal to 0.40 mL / cm / day, the corrosion resistance is remarkably superior to that of an existing commercial high-Zn magnesium alloy, and the magnesium alloy is suitable for the fields, with requirements for corrosion resistance and light weight, such as 3C, unmanned aerial vehicles, robots and automobiles.

The utility model discloses a kind of eccentric disc for rotary electronic multi-arm machine, including eccentric disc body and eccentric disc boss, the eccentric disc body is equipped with mounting hole;The eccentric disc boss is extended from the side of eccentric disc body, the eccentric disc boss and eccentric disc body form stepped structure, the eccentric disc body and eccentric disc boss are integrally formed whole component.The utility model improves machining precision, operating stability and manufacturing economy by structure optimization and function integration.Eccentric disc body and eccentric disc boss, integrally formed whole component with stepped structure is formed by the two, the design not only guarantees the integrity and rigidity of structure, but also provides reliable positioning datum plane for subsequent assembly and clamping, effectively avoids the problem of looseness or misplacement possibly caused by split connection, improves dynamic stability under high-speed operation.

The invention relates to the technical field of non-ferrous metal forging forming, and discloses a water cooling device for aluminum alloy forge piece machining, which comprises a second water tank for containing cooling water to carry out water cooling on a forge piece; the water inlet pipeline is communicated with the water inlet pipeline and is used for injecting cooling water into the second water tank; a water pump; a conveyor belt; a console; the clamping plates are evenly distributed on the outer surface of the conveying belt, and a containing area for containing forge pieces is arranged between every two adjacent clamping plates. The second water tank is arranged, water cooling is rapidly conducted after finish forging and trimming, the size of the aluminum alloy forging is rapidly stabilized, deformation is reduced, the size precision of the forging is ensured, water cooling can make the structure of the aluminum alloy forging more compact, grains are refined, and therefore the uniformity and mechanical performance of the structure are improved, residual stress is eliminated, the roughness of the trimming surface is reduced, and the quality of the aluminum alloy forging is improved. And meanwhile, the cooling time is shortened, and the production efficiency is improved.

The invention discloses a friction deposition forming manufacturing method for an aluminum alloy aircraft hub, which comprises the following steps: establishing a three-dimensional model of the aircraft hub, depositing an aluminum alloy metal bar on a substrate according to a preset deposition path by adopting a friction deposition forming method according to the three-dimensional model of the aircraft hub to obtain an aircraft hub forging stock, the aircraft hub forging stock is subjected to finish forging and air cooling to the room temperature, a forging stock is obtained, the forging stock is subjected to heat treatment, and the aluminum alloy aircraft hub is obtained.The defects that in traditional forging production of the aircraft hub, the structure is uneven, and grains are coarse are effectively overcome, and the tensile strength, the ductility and other performance of the aluminum alloy aircraft hub are improved.

The invention provides an electron beam fuse additive manufacturing method for gradient TA15 titanium alloy, and belongs to the technical field of additive manufacturing. The problem that a traditional manufacturing process is more and more difficult to meet the machining and manufacturing requirements of TA15 parts of complex structures is solved. The method comprises the following steps that 1, a printing wire and an additive substrate are pretreated; 2, a printing program is set, a three-dimensional solid model is established based on the target TA15 titanium alloy, slicing treatment importing is conducted, and a scanning path, preheating parameters and printing process parameters are set; and 3, equipment is started, vacuumizing is conducted till the pressure reaches 9.9 * 10 <-3 > Pa, TA15 alloy printing is conducted according to the set printing parameters and programs, all layers are completed, in the step 1, an additive substrate is a TA1 substrate, the size of the substrate is 200 mm * 10 mm * 10 mm, a printing wire is a TA15 alloy wire, and the diameter of the wire is 1.6 mm. The method is mainly used for additive manufacturing of the gradient TA15 titanium alloy.

The application discloses a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material, and aims to solve the technical problems that in the existing additive manufacturing, due to the high content of Mg element in the 5-series aluminum alloy, the additive manufacturing is difficult, and the aluminum alloy composite material obtained by additive manufacturing has crack defects and poor densification effect due to thermal cracks and evaporation of strengthening elements. The modification method comprises the following steps: obtaining 5-series aluminum alloy powder; adding titanium carbide particles and element powder to the 5-series aluminum alloy powder for mixing to obtain mixed powder; after heat preservation treatment of the mixed powder, the composite powder with small particle size is collected through screening; and the composite powder is formed by additive manufacturing, so that the modification of the 5-series aluminum alloy is completed, and the aluminum alloy composite material is obtained. The technical scheme of the application is used for providing a titanium carbide and element powder modification method for 5-series aluminum alloy and an aluminum alloy composite material.

The invention provides an electrolyte for preparing a high-elongation lithium battery copper foil, a copper foil and a preparation method of the copper foil, the electrolyte comprises a main electrolyte and additives, the main electrolyte comprises copper sulfate, sulfuric acid and chloride ions, the additives comprise a first additive with the concentration of 5-40 mg / L and a second additive with the concentration of 2-20 mg / L, the concentration of the first additive is 10-100 mg / L, the concentration of the second additive is 10-100 mg / L, the concentration of the third additive is 10-100 mg / L, the first additive is an amino-containing high-molecular compound, the concentration of the second additive is a compound with a sulfonic acid group, and the concentration of the third additive is a mixture of a polyepoxy compound, a modified polysaccharide compound and a polyamine compound. By adopting the additive in the scheme and the specific proportion thereof, the microstructure of the copper foil can be effectively regulated and controlled, the lithium battery copper foil with compact and uniform texture is obtained, and meanwhile, the lithium battery copper foil has high normal-temperature ductility.

The utility model discloses a multi-positioning step parting low-pressure casting mold which comprises a mold body, the mold body is of a left-right parting main body structure made of ZG310-570 cast steel, and the left-right parting main body structure comprises a left upper half mold, a left lower half mold, a right upper half mold and a right lower half mold. The left-right parting main body structure is transversely provided with a left-right symmetrical parting surface and is longitudinally provided with a curved surface step parting surface with a 35-degree dip angle. The repeated positioning precision of the mold is improved to + / -1mm through a three-stage positioning system, the position precision of a multidirectional boss is improved by 60%, the error rate is reduced by 30%, the product percent of pass reaches 96.5% by combining effective limiting of a curved surface step parting surface on a boss on the outer surface of a casting, and meanwhile, by means of the synergistic effect of a composite exhaust system and a longitudinal grading water gap system, the product quality is improved. And the air hole defect rate is controlled to be below 0.8%, the feeding problem at the hot spot is effectively solved, the casting quality and the production efficiency are remarkably improved, and the production requirements of high-end precision castings are met.

The invention discloses a friction coating high-temperature-resistant high-entropy alloy coating preparation device and method, and belongs to the technical field of high-entropy alloy coating preparation. The device comprises a coating friction coating part and a feeding part, the coating friction coating part comprises a discharging barrel, a coating head, a motor, a threaded conveying rod, a material plasticizing device and a cooling protection device, and the feeding part comprises a feeding hopper and a conveying pipe and is connected with the discharging barrel through the conveying pipe. Through integrated design, the device can be used for preparing the high-entropy alloy coating after the preparation steps of device connection inspection, operation stability inspection, feeding and the like. The device can be used for preparing a single high-entropy alloy coating, a component gradient high-entropy alloy coating and a composite high-entropy alloy coating.

The application provides an alloy profile preparation device. The alloy profile preparation device comprises a heating box and a forming assembly. The heating box comprises a box body, an ultrasonic homogenization probe and a melting furnace. The melting furnace comprises a furnace body and a furnace cover. The melting furnace is arranged in the box body. The ultrasonic homogenization probe is installed on the top of the box body and extends into the furnace body through the furnace cover. The ultrasonic homogenization probe is used for forming an acoustic pressure wave by generating high-frequency vibration. The acoustic pressure wave propagates in the alloy solution melted in the melting furnace to realize homogenization of the alloy solution. The forming assembly comprises a water cooling assembly, a guide rod and a casting and rolling machine. The melting furnace is communicated with the guide rod through an electromagnetic valve. The guide rod is used for guiding the alloy liquid flowed out of the melting furnace to the casting and rolling machine for rolling to form an alloy profile. The water cooling assembly is arranged at the guide rod to cool the alloy solution flowed out of the melting furnace. The alloy profile preparation device can realize preparation of high-quality alloy profiles.

This invention discloses a near-net-shape aluminum-based composite material part manufacturing method and part. The manufacturing method includes: establishing a three-dimensional part model of the part to be manufactured, wherein the part model has a built-in double-helix siphon microchannel; slicing the part model to obtain slice data for each layer, wherein the slice data includes the geometry and printing path of the part in that layer; printing the part model using sand mold printing according to the slice data to obtain a preform, wherein after printing each layer, a binder is sprayed onto the powder layer used for printing; the preform is sequentially sintered, post-treated, and pre-treated to obtain a treated preform; the treated preform is placed in a pre-fabrication container, impregnated with molten aluminum, and then slowly cooled and solidified to obtain the part to be manufactured. This invention solves the problems of high processing difficulty and difficulty in controlling the precision of aluminum-based composite material parts in the prior art.

The utility model belongs to the technical field of roller casting equipment, and particularly relates to multi-channel type roller casting equipment which comprises three casting equipment bodies, a base is arranged at the bottoms of the casting equipment bodies, three auxiliary plates are evenly connected to the top end of the base, and the three auxiliary plates are arranged on the base. An annular groove is formed in the top end of the auxiliary plate, and through holes are formed in the top end of the base and the top end of the auxiliary plate. The multi-channel type roller casting equipment has the advantages that bubbles in pouring liquid are effectively promoted to rise to the surface and break, and therefore the defects of bubbles, gaps, air holes and the like in a casting after the pouring liquid is solidified are remarkably reduced; the compactness and the overall quality of the casting are improved, the pouring liquid is more uniform in the solidification process due to vibration, and the phenomena of stress concentration and non-uniform solidification caused by local premature solidification are avoided. The mechanical performance of the casting can be improved, and the surface quality and the size precision of the casting can be improved.

The invention discloses a high-temperature wear-resistant composite coating, a preparation method, a steel part and application of the high-temperature wear-resistant composite coating, and the high-temperature wear-resistant composite coating is prepared from the following raw materials in percentage by weight: 5-10% of TiCN powder, 0.3-0.8% of Re2O3 powder and the balance of metal powder, according to the microstructure of the high-temperature wear-resistant composite coating, a gamma-Co solid solution of a face-centered cubic structure serves as a matrix phase, and intermetallic compounds Co3W, FeCo2, FeCo5, (Cr, Fe) 7C3 and Cr3C2 and part of elements Mo, W and Ni are distributed in the matrix phase in a dispersed mode. The high-temperature wear-resistant composite coating which is free of pores and cracks, compact in structure and fine in grain can be prepared on the surface of the matrix by adopting a cladding process, and the high-temperature wear resistance and the high-temperature oxidation resistance of the surface of the matrix are remarkably improved.

The invention discloses a preparation method of copper-titanium alloy chopsticks, and relates to the technical field of non-ferrous metal alloys. Comprising the following steps: uniformly mixing raw materials to obtain mixed powder; the mixed powder is pressed into a consumable electrode bar, and a bar material is obtained; the bar is subjected to vacuum sintering at the temperature of 500-900 DEG C and then subjected to vacuum consumable electric arc melting, the melting current ranges from 1.5 KA to 3.0 KA, the melting voltage ranges from 18 V to 25 V, and a cast ingot is obtained; the cast ingot is forged, the final forging temperature is controlled to be not lower than 700 DEG C, and a round bar is obtained; the round bar is subjected to hot rolling treatment at the temperature of 830-900 DEG C, and a hot-rolled round bar is obtained; and carrying out solution treatment and aging treatment on the hot-rolled round rod, and then carrying out post-processing to obtain the finished copper-titanium alloy chopsticks. The copper-titanium alloy chopsticks have good mechanical properties, can reduce damage caused by collision in the use process of the chopsticks, and have obvious sterilization and bacteriostasis effects at the same time, so that the safe use performance of the chopsticks is improved.

The application discloses an extrusion casting forming device, which comprises a rack, a fixed mold, a movable mold, a forging mechanism and a pressure injection mechanism arranged on the rack, the forging mechanism drives the movable mold to move and combine with the fixed mold to form a mold cavity matched with the shape of a casting, the pressure injection mechanism injects metal melt into the mold cavity to fill the mold cavity and seal the mold cavity, and the forging mechanism drives the movable mold to continuously forge the casting in the mold cavity after the mold cavity is filled.

The embodiment of the invention provides a high-wear-resistance forged chain for a boiler slag extractor and a friction welding weaving process, a base material is forged after being heated, a forged ring is obtained, and the section of the forged ring is rectangular; cutting the part of the forged ring along the width direction to obtain half rings with the number twice that of the part of the forged ring; the forged rings and the semi-rings are alternately distributed by weaving friction welding equipment, the two semi-rings with opposite openings are subjected to friction welding to form a welding ring, and the forged rings and the welding ring are alternately distributed to form the chain. Compared with traditional direct bending forming of bars, the forged rings have higher material strength and a denser internal organization structure, so that the overall bearing capacity of the chain is improved, and the service life of the chain is prolonged. The sections of the chain rings are rectangular, and the contact positions and the contact parts of the adjacent chain rings are in surface contact, so that the contact area is increased, the contact stress is reduced, the abrasion of a carburized layer can be effectively slowed down, and the service life of the chain is prolonged.