105results about How to "Dense tissue" patented technology

The invention relates to a stirring friction extrusion solid phase additive deposition layer edge precision control device and method, and belongs to the technical field of additive manufacturing, the stirring friction extrusion solid phase additive deposition layer edge precision control device comprises a hollow stirring head, the hollow stirring head can rotate, and a through hole is formed in the central axis of the hollow stirring head and used for filling raw materials; the periphery of the hollow stirring head is sleeved with four split type sleeves, and the four split type sleeves can independently move up and down respectively. According to the method, side wall forming of the additive layer is limited, generation of burrs, the arc-shaped side wall and semi-cylindrical materials at the two ends of the additive layer is restrained, and therefore the follow-up cutting amount is reduced, and near-net forming of components is achieved; by limiting the plasticized material to flow to the periphery, the additive layers at the center and the edge are more compact, and the mechanical properties of the whole additive layers and the side wall part are improved; and multi-layer material adding in the vertical plane and multi-channel material adding in the horizontal plane can be achieved, accurate forming of the side wall can be achieved under the condition that the device is not replaced, and the flexibility of the device is improved.

The invention provides a high-entropy-titanium-aluminum alloy and a laser melting deposition preparation method thereof, and relates to the technical field of alloy preparation. According to the method, the high-entropy-titanium-aluminum alloy is prepared through laser melting deposition, and the laser melting deposition has the advantages of being large in temperature gradient and high in cooling speed, so that the prepared material is small in crystal grain, compact in structure and excellent in mechanical property. The titanium-aluminum alloy and the high-entropy alloy are compounded, the overall strength of the alloy is improved, and due to the fact that the titanium-aluminum alloy is low in density, the overall density of the alloy can be reduced, and the requirement for light weight is met. According to the method, the final high-entropy-titanium-aluminum alloy components are changed by changing the powder feeding rates of different powder materials, compared with a laser melting deposition mode that powder with different contents is mixed and then put into a powder feeding barrel, the process of weighing the powder and mechanically mixing the powder is omitted, the method is more flexible in design, and the method is suitable for large-scale industrial production. Alloys with different components can be prepared in batches, and the efficiency is obviously higher than that of a mechanical powder mixing method.

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 the field of cutter coatings, and provides a coated hard alloy cutter aiming at the problem that the mechanical property of the cutter is influenced by poor binding force between the coating and a substrate, the cutter substrate is tungsten carbide-based hard alloy, and the hard alloy contains VC, Ru and TaC; and the coating sequentially comprises a molybdenum sulfide layer, an aluminum nitride layer and an aluminum titanium silicon nitride layer from inside to outside. By limiting the components of the cutter base body and the sequence and components of the multi-element coating, the cutter with good binding force between the coating and the base body and long service life is obtained.

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 production process of a steel-cored aluminum strand, and relates to the technical field of cable production, and the production process of the steel-cored aluminum strand comprises the following steps: step 1, raw material preparation and inspection: selecting a high-carbon steel wire rod, a galvanized steel wire and an aluminum single wire for inspection according to lead use requirements; after the surface of the steel wire rod is treated, the steel wire rod needs to be cold-drawn into the steel wire, and in order to improve the corrosion resistance of the steel wire, the surface of the steel wire is galvanized; according to the production process of the steel-cored aluminum stranded wire, the steel-cored aluminum stranded wire is formed by stranding the high-conductivity aluminum wire stranding layer and the galvanized steel wire, the welding or crimping technology is adopted at the joint of the aluminum wire stranding layer and the steel wire before stranding, and the stranded steel-cored aluminum stranded wire needs to be subjected to heat treatment; the heat treatment can improve the conductivity, strength and hardness of the stranded wire. And a solid insulating layer needs to be extruded outside the stranded wire, so that the functions of improving the insulating property and enhancing the overall strength of the stranded wire are 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 relates to an amorphous film and a preparation method and application thereof.The amorphous film is an AlSiC amorphous film and is composed of Al, Si and C. The preparation method of the amorphous film comprises the following steps that a target material is provided, the amorphous film is deposited on a base body through a magnetron sputtering method, and the amorphous film can be used as a surface protection material. The AlSiC amorphous film is formed by disorderly arranging three kinds of atoms of Al, Si and C, so that the AlSiC amorphous film has high strength, high hardness and high toughness, toughness integration of the amorphous film is achieved, and therefore when the AlSiC amorphous film serves as a surface protection material, the protection effect is good, and the service life is longer. Meanwhile, the AlSiC amorphous film is prepared through a magnetron sputtering method, the deposition rate is stable, and the AlSiC amorphous film obtained through deposition is uniform in component, compact in structure, few in defect, good in combination with a base body and high in adhesive force.

The invention belongs to the technical field of new materials, and discloses an alloy oxide tritium-resistant coating and a preparation method thereof. The preparation method comprises the following steps: after a metal base material is pretreated, sputtering a metal Cr target by adopting a magnetron sputtering technology, and depositing a pure Cr base layer on the surface of the metal base material; a magnetron sputtering technology is adopted, an oxidation transition layer and an alloy oxide layer are sequentially deposited on the surface of a pure Cr base layer by sputtering an Al target and a Cr target at the same time in a dual-power mode, and a composite coating is obtained; and the composite coating is subjected to annealing treatment, and the alloy oxide tritium-resistant coating containing the crystalline oxide is obtained. According to the preparation method, the problem of thermal mismatch between the coating and the base material can be effectively relieved, and the alloy oxide tritium-resistant coating with high binding force with the base material is successfully formed on the surface of the metal base material; the preparation method is simple in technological process, free of pollution in the whole process, high in deposition speed and capable of saving cost; and the prepared alloy oxide tritium-resistant coating has good tritium-resistant and hydrogen-resistant performance.

The invention belongs to the field of composite materials, and particularly discloses a magnesium-based composite material and a preparation method and application thereof.The preparation method comprises the following steps that S1, magnesium-based alloy particles are heated to be in a semi-solid state, then the magnesium-based alloy particles are mixed with metal reinforced particles, and semi-solid mixed slurry is obtained; and S2, the semi-solid mixed slurry is subjected to pressurized extrusion molding, and the magnesium-based composite material is prepared. According to the preparation method, the metal reinforced particles and the semi-solid magnesium-based alloy slurry are mixed, extrusion molding is conducted under pressurization, continuous production can be achieved through the whole preparation method, the production process is short, the efficiency is high, meanwhile, a semi-solid extrusion method is adopted, and the production cost is low. The prepared magnesium-based composite material has the advantages of compactness, no loose defect, uniform distribution of metal reinforced particles, high mechanical strength and the like.

The invention relates to the field of metal materials, and provides a high-speed extrusion low-alloying high-toughness magnesium alloy and a preparation method thereof. The alloy is prepared from the following components in percentage by mass: 0.7 to 1.2 percent of manganese, 0.2 to 0.8 percent of aluminum, 0.4 to 1.2 percent of zinc, 0 to 0.25 percent of additive elements, less than or equal to 0.05 percent of inevitable impurities and the balance of magnesium, the additive element is one or any combination of silver or rare earth, the content of the silver is 0-0.25%, the content of the rare earth is one or combination of cerium or scandium, the content of the cerium is 0-0.25%, the content of the scandium is 0-0.25%, and the total content of alloying elements in the alloy system is less than 3.5%. The preparation method comprises the steps of smelting, gravity casting and high-speed extrusion. The low-cost multi-element microalloyed magnesium alloy is prepared, meanwhile, high-speed extrusion forming of the alloy material is achieved, and long-time heat treatment is not needed before extrusion machining. Wherein the extrusion speed reaches 12-60 m / min, the elongation of the magnesium alloy profile is larger than or equal to 18%, the ratio of the yield strength to the total element content is larger than or equal to 132 MPa / wt.%, and compared with the prior art, the performance is remarkably improved.

The embodiment of the invention provides a single-machine-head wire rod synergistic friction stir solid-phase additive manufacturing device and method, and belongs to the technical field of friction stir welding / additive manufacturing. The device comprises a rod feeding stirring friction solid-phase extrusion additive manufacturing stirring head, a wire filling stirring friction solid-phase extrusion additive manufacturing stirring head and a transmission device. In the additive manufacturing process, the front stirring head firstly carries out the additive manufacturing process, under the action of rotating friction extrusion of the stirring head, additive raw materials are subjected to thermoplastic softening to be deposited on an additive base plate, and the additive raw materials advance by a certain distance in the advancing direction along with a stirring friction additive manufacturing mechanism; the rear stirring head can be used for carrying out operations such as dissimilar material addition and surface treatment; under the condition that only a single stirring head exists, an original stirring friction additive manufacturing device does not need to be transformed, stirring friction solid-phase additive manufacturing equipment combining double-stirring-head rod feeding and wire filling is rapidly expanded, and high-performance stirring friction additive manufacturing is achieved.

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 relates to the technical field of die casting, and particularly discloses a water-cooling die for vacuum melting, which comprises a die main body and a base module, the mold body comprises an outer barrel and an inner barrel, the inner barrel is coaxially arranged on the inner side of the outer barrel, the outer circumferential wall of the inner barrel is in interference fit with the inner circumferential wall of the outer barrel, a first water outlet and a first water inlet are formed in the side wall of the outer barrel, a first flow channel is spirally arranged on the outer circumferential wall of the inner barrel, and a second flow channel is formed in the outer circumferential wall of the inner barrel. The first water outlet and the first water inlet are respectively communicated with the first flow channel; the base module comprises a base body, a circuitous second flow channel is arranged in the base body, a second water inlet and a second water outlet which are communicated with the second flow channel are formed in the peripheral wall of the base body, and the second water outlet is communicated with the first water inlet. According to the method, the solidification rate of the casting can be effectively increased, the casting structure is more compact, the crystallization and solidification time of the casting can be effectively shortened, and the production efficiency is improved.

The invention relates to a heat-treatment-free aluminum alloy and an extrusion casting preparation method thereof, belongs to the technical field of non-ferrous metal alloys, and solves the problems that in the prior art, a heat-treatment-free aluminum alloy is not high in strength, poor in corrosion resistance and difficult to meet the use requirements of large thin-wall aluminum alloy castings. The invention relates to a heat treatment-free aluminum alloy, which comprises the following components in percentage by mass: 2.5 to 4.0 percent of Mg, 0.8 to 1.5 percent of Mn, 0.5 to 1.2 percent of Zn, 0.05 to 0.3 percent of RE, less than or equal to 0.05 percent of single impurity, less than or equal to 0.15 percent of total impurity and the balance of Al. And preparation of the high-strength heat-treatment-free aluminum alloy is achieved.

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 forging die comprises a lower die assembly and an upper die assembly, the lower die assembly comprises a lower die base, a bottom die and a vertical lower ejector rod, first side dies are arranged in a lower die groove in a left-right symmetry mode, and second side dies are arranged in a front-back symmetry mode; the upper die assembly comprises an upper die base, a top die and a vertical upper ejector rod, third side dies are arranged in an upper die groove in a left-right symmetry mode, and fourth side dies are arranged in a front-back symmetry mode. The side mold I and the side mold III are symmetrically arranged up and down; the side mold II and the side mold IV are symmetrically arranged up and down; horizontal ejector rods are arranged between the upper die base and the lower die base in a bilateral symmetry mode, and the bottom die, the top die, the first side die, the second side die, the third side die, the fourth side die, the vertical upper ejector rods and the horizontal ejector rods are combined between the upper die base and the lower die base to form a die cavity of the pump body forge piece. The die sequentially applies deformation force to blanks to form the blanks according to specified process actions, metal flow is reasonable, the size precision of forgings is high, and the surface quality is good.

The utility model relates to full-automatic welding equipment for a miniature terminal for an automobile, which comprises a discharging mechanism, and a welding control mechanism, a contact shaping and force measuring mechanism and an automatic cutting mechanism which are erected on a rack, a material belt output from the discharging mechanism sequentially penetrates through the welding control mechanism, the contact shaping and force measuring mechanism and the automatic cutting-off mechanism, and the welding control mechanism comprises a material belt clamping, transferring and positioning mechanism for clamping, transferring and positioning the terminal material belt and a silver point feeding mechanism for automatically feeding silver points in a vibration disc mode. The upper electrode assembly and the lower electrode assembly are used for conducting silver spot welding on the terminals, the contact shaping force measuring mechanism is used for conducting shaping machining and welding fastness detection on the welded contacts, and the automatic cutting-off mechanism is used for cutting welded terminal material belts into spare parts one by one; the automatic welding device can achieve efficient welding, welding points are accurate, linkage is good, clamping is reliable, the structure is stable, operation is easy, running is stable, and precision is high.

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 invention discloses a zinc impregnation agent, a zinc impregnation method of an electric power connection fitting and an anti-corrosion electric power connection fitting. A steel fitting is austenitized and then cooled; the surface of the cooled steel fitting is pretreated; and the pretreated steel fitting and a zinc impregnation agent are added into a closed impregnation tank, heat preservation is conducted at the set temperature, and then staged cooling is conducted. The zinc impregnation agent is prepared from the following components in percentage by mass: 54.0 percent to 57.0 percent of zinc powder, 20.0 percent to 23.0 percent of SiO2 powder, 3.0 percent to 3.5 percent of CeO2 powder, 5.0 percent to 6.0 percent of aluminum powder, 2.5 percent to 3.0 percent of nickel powder, 2.5 percent to 3.0 percent of chromium powder, 3.0 percent to 3.5 percent of magnesium powder, 2.5 percent to 2.8 percent of NH4Cl powder and 2.5 percent to 3.0 percent of B4C powder. The thickness of a zinc impregnation layer is larger than 160 m, and the hardness of the zinc impregnation layer is larger than 480 HV; and the sherardizing layer is compact in structure, and the sherardizing layer is well combined with the surface of the 35CrMo steel fitting.

The utility model discloses an axle suspension box steel casting for an internal combustion locomotive, which comprises an outer mold, a pouring gate mold and an outer chilling block, semi-ring molds are arranged at the left end and the right end of the outer mold, a downsprue positioning plate is arranged on the surface of the outer mold, an accessory mold is arranged on the surface of the outer mold, an inner chilling block is arranged in the accessory mold, the pouring gate mold is arc-shaped, and the pouring gate mold is attached to the outer mold. A third loam core is arranged between the pouring gate mold and the outer mold, the multiple outer chilling blocks are annularly arranged on the surface of the semi-ring mold, and through the outer mold, the pouring gate mold and the third loam core, the size and the smooth and clean surface quality of the axle suspension box can be effectively guaranteed, and the hot crack phenomenon generated when molten metal solidifies and shrinks is effectively reduced; through the direct pouring gate positioning plate and the pouring gate mold, rapid mold filling of molten metal can be guaranteed, the good feeding effect is achieved, shrinkage cavities and shrinkage porosity can be effectively prevented, the internal structure of the axle suspension box is compact, the defects of sand inclusion, air holes and the like in the axle suspension box are few, and the production quality of the axle suspension box is improved.

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 present invention discloses a five-element MAX phase ceramic material and a preparation method thereof. The molecular formula of the five-element MAX phase material is (ZrCrTi)AlC2. The raw materials including Zr powder, Cr powder, Ti powder, Al powder and C powder mixed powder are first ball-milled to prepare a uniformly mixed nanostructured mixed powder; the mixed powder is placed in a steel mold and pressed into a ceramic blank, and after molding, vacuum hot pressing and sintering is performed in a vacuum hot pressing furnace to prepare the ceramic blank. The (ZrCrTi)AlC2 ceramic material prepared by the present invention breaks through the quaternary restriction of the types of traditional MAX phase elements, and is different from the i-MAX in which the M (Zr, Cr, Ti) elements are mutually doped. The single element atoms form a layer by themselves, so it has higher hardness, toughness and strength, and has good machinability, while improving the conductivity of the five-element MAX phase ceramic material.

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.

The invention relates to the technical field of anti-abrasion composite materials, in particular to a cast bionic metal ceramic plough share and a preparation method thereof.The preparation method comprises the following steps that a plough share precoated sand shell model with a scale structure is manufactured; mixing and kneading a water-based binder and alloy powder to prepare alloy powder paste, coating the soil contact part in the sand shell model of the plow share precoated sand with the alloy powder paste, and drying; the dried plow share precoated sand shell model and a casting system are subjected to box assembling, molten low-alloy structural steel is smelted, casting is conducted, and a composite plow share casting is obtained; according to the method, the metal ceramic alloy layer synthesized on the working surface of the plough share casting in situ is subjected to one-time casting forming, secondary machining is not needed, and the process is simple, rapid and efficient.

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.

The invention relates to the field of compressor valve plates, in particular to a compressor valve plate end face grinding special resin grinding wheel and a preparation method thereof.The compressor valve plate end face grinding special resin grinding wheel comprises, by weight, 100 parts of grinding materials, 4-6 parts of phenolic resin liquid, 10-15 parts of phenolic resin powder, 1-2 parts of polyvinyl butyral resin, 2-3 parts of gypsum powder, 1-2 parts of potassium fluoborate and 1-2 parts of zinc sulfide. Wherein the grinding material is a large-particle corundum micro-powder agglomerated grinding material prepared by utilizing a ceramic bonding agent. The large-particle corundum micro-powder aggregate prepared by the ceramic bond is used as the abrasive material, the abrasive material has a porous structure, high bonding strength and good self-sharpening performance, the resin grinding wheel prepared by the abrasive material has the advantages of loose structure, high mechanical strength, good retentivity and the like, and the abrasive material has the good self-sharpening performance on the premise that the roughness is guaranteed. The grinding efficiency is high, the heat dissipation performance is good, the single-time feed amount is large, finishing is not needed, the grinding procedures can be reduced, and the workpiece surface precision is guaranteed.

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.