279results about How to "Fine grain" patented technology

The invention discloses fine-grain high-cleanliness steel for a harmonic reducer flexible gear of an industrial robot and a preparation method, and belongs to the technical field of metallurgy. The steel for the flexible gear comprises the following chemical components in percentage by mass: 0.38 to 0.42 percent of C, 0.20 to 0.30 percent of Si, 0.60 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.60 to 0.90 percent of Cr, 0.15 to 0.25 percent of Mo, 1.50 to 1.80 percent of Ni, 0.015 to 0.035 percent of Nb, less than or equal to 0.0006 percent of O and the balance of iron and inevitable impurity elements. The production method comprises the working procedures of vacuum induction furnace smelting, electroslag remelting, casting blank forging, bar heating, bar rolling and rolled material cooling. The steel for the flexible gear has fine austenite grains and high cleanliness, and the technical requirements of the steel for the harmonic reducer flexible gear of the industrial robot are met.

The invention relates to a high-toughness corrosion-resistant aluminum alloy and a preparation method thereof. The high-toughness and corrosion-resistant aluminum alloy is prepared from the following components in percentage by mass: 3.5 to 4.6 weight percent of Mg, 1.3 to 1.5 weight percent of Zn, 0.1 to 0.4 weight percent of Sc, 0.4 to 0.5 weight percent of Zr, 0.4 to 0.5 weight percent of Cu and the balance of Al. The optimized preparation method comprises the steps that aluminum alloy mixed powder serves as a raw material, laser additive manufacturing is adopted, and a printed product is obtained through printing; during printing, the laser power is controlled to range from 250 W to 350 W, the laser scanning speed ranges from 800 mm / s to 1200 mm / s, the laser spot diameter ranges from 60 micrometers to 80 micrometers, the scanning interval ranges from 0.02 mm to 0.05 mm, and the powder laying thickness ranges from 0.03 mm to 0.05 mm. Based on a cross alloy design strategy, the in-situ alloying powder manufacturing technology and the laser powder bed melting technology are combined, collaborative optimization of the mechanical property and the corrosion resistance is achieved, meanwhile, the material development and preparation cost is effectively reduced, and the application requirements of multiple fields are met.

The invention provides a high-temperature alloy for manufacturing a nickel-copper alloy hot extrusion die, which is characterized by comprising the following components in percentage by weight: 0.02 to 0.08 percent of C, less than or equal to 0.15 percent of Si, less than or equal to 0.15 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.01 percent of S, 14.0 to 17.0 percent of Cr, 7.5 to 9.5 percent of Mo, 2.2 to 2.6 percent of Nb, 1.0 to 1.6 percent of Al, 2.2 to 2.8 percent of Ti, 0.005 to 0.015 percent of B, 0.01 to 0.05 percent of Zr, 21.0 to 24.0 percent of Fe and the balance of Ni. The preparation method of the alloy comprises the following processes: firstly, alloy raw materials are subjected to vacuum induction melting and then cast into ingots, then electroslag ingots are obtained through electroslag remelting, then the electroslag ingots are subjected to multi-heating-number forging, and then heat treatment is carried out. The highest use temperature of the alloy reaches 1000 DEG C, and the oxidation rate at 1000 DEG C is as low as 0.08 g / m < 2 >. H; at the temperature of 650 DEG C, the tensile strength reaches 1000 MPa, the yield strength reaches 850 MPa, the fatigue strength is higher than 400 MPa, and the lasting time of the load of 700 MPa reaches 80 h; the service life of a nickel-copper alloy hot extrusion die made of the alloy can reach 25000 times.

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 invention belongs to the technical field of sintering mixers, and particularly relates to an intelligent water adding control system and method for a sintering mixer. The system comprises a particle size online detection unit, a fuzzy control unit, a man-machine interaction display unit and a remote communication unit, the particle size online detection unit shoots an image of the mixture and performs image recognition to obtain a particle size distribution result of the mixture, and the fuzzy control unit controls the opening degree of the electric control valve according to the particle size distribution result. According to the control system and method, the water adding amount of the mixing machine can be accurately and intelligently adjusted in real time according to the target particle size range, the good mixing machine granulation effect is achieved, the air permeability of the mixture is guaranteed, the ultra-thick material layer sintering technology is achieved, the quality and strength of sintered ore are improved, and sintering energy consumption is reduced.

The invention belongs to the related technical field of metal fuels, and discloses an aluminum-lithium alloy powder fuel and a preparation method thereof, the aluminum-lithium alloy powder fuel is prepared from the following raw materials in percentage by mass: 2-10% of Li, 0.1-5% of Mg, 0.1-3% of RE and the balance of Al. The added Mg element can separate out stable, fine and uniformly-distributed intermetallic compounds besides a micro-explosion effect, the activity of Li in the alloy can be reduced, the stability of the fuel can be improved, the added RE element can form an Al3 (Li, RE) precipitated phase with a core-shell structure by taking the precipitated intermetallic compound Al3RE as a heterogeneous nucleation particle of a metastable phase delta '(Al3Li), and the stability of the fuel can be improved. Through targeted component design, the structure regulation and control of the precipitated phase in the alloy powder can be realized, so that the microstructure of the precipitated phase is improved, and the combustion performance of the fuel is improved.

The invention discloses a regeneration method and device for waste activated carbon powder, and relates to the technical field of regeneration of activated carbon powder. A secondary granulation assembly is arranged on the right side of the primary granulation assembly; a drying assembly is arranged on the right side of the secondary granulation assembly; a communicating pipeline is arranged between the top of the drying assembly and the top of the granulation assembly; a screening assembly is arranged on the right side of the drying assembly; a mixing assembly is arranged at the left bottom of the conveying assembly. The bonding effect between the material and the binder is further improved by means of the dredging effect of the material guide rod, and meanwhile, the limiting ring promotes the elastic scraping strip to be always tightly attached to the inner wall of the mixing assembly, so that activated carbon powder is prevented from being attached to the inner wall of the mixing assembly due to high humidity; and resource loss caused by the fact that materials are difficult to adhere to the composite adhesive and remain in the mixing assembly is avoided.

The invention provides a process for optimizing the grain size grade difference of a large-size nickel-based superalloy bar, and belongs to the technical field of nickel-based superalloy bar manufacturing. The process comprises the following steps that S1, raw materials are weighed and smelted to obtain an electroslag ingot; s2, uniform diffusion annealing is carried out; s3, heating before forging to obtain a forging stock; s4, the forging stock is subjected to two times of drawing-out and two times of upsetting treatment, and a semi-finished product is obtained; and S5, the semi-finished product is continuously drawn out, and the bar is obtained. Through the integral design of the whole process scheme such as component design, four-section type diffusion annealing and setting of the forging temperature and the environment temperature, the thermal deformation resistance during forging is greatly reduced, center grains are refined, the grain size grade difference from the edge to the core of the GH4169 bar is controlled within the 1.5 grade, and the process is feasible, low in cost and suitable for large-scale production. The problem that the grain size grade difference of the nickel-based superalloy bar with the diameter larger than or equal to 350 mm is large is solved for the first time.

The invention discloses a preparation method of a zinc-nickel alloy coating. A formula of a plating solution comprises zinc chloride, nickel sulfate hexahydrate, sodium hydroxide, sodium potassium tartrate tetrahydrate, trisodium citrate, potassium citrate, triethanolamine, tetraethylenepentamine, a primary brightener and a secondary brightener. A double-acid compound complexing agent is used for replacing a traditional single-acid complexing agent, and a plating layer can have a finer crystal structure by compounding a basic plating solution to electroplate a zinc-nickel alloy, so that the plating layer with more excellent corrosion resistance is obtained; the stability of metal ions in an electroplating solution is improved, the conductivity and uniformity of the electroplating solution are improved, the quality of a plating layer can be remarkably improved, the corrosion resistance and hardness of the plating layer are improved, pores in the plating layer are reduced, and the protection capability on a matrix is enhanced.

The invention provides an electric arc additive manufacturing high-corrosion-resistance magnesium alloy component and a preparation method and application thereof.The preparation method of the electric arc additive manufacturing high-corrosion-resistance magnesium alloy component comprises the following steps that a magnesium alloy base plate is fixed to a workbench provided with a heating plate, and the heating plate is provided with a thermocouple; the thermocouple is connected with the temperature control box to control the temperature of the heating plate so as to realize constant-temperature heating of the magnesium alloy substrate; and the magnesium alloy wire is fixed to wire feeding equipment, single-channel layer-by-layer reciprocating deposition is carried out along the set track according to the set welding machine technological parameters till the target height is reached, and the high-corrosion-resistance magnesium alloy component is obtained. According to the method, the temperature of the magnesium alloy substrate and the interlayer temperature are controlled at a constant temperature through the external temperature field, the manufacturing process parameters are adjusted, the interlayer binding force and the forming quality of the magnesium alloy component are improved, and the prepared high-corrosion-resistance magnesium alloy is small in grain size and uniform in precipitated phase distribution and shows excellent corrosion resistance compared with a traditional cast magnesium alloy.

The invention discloses a large-specification TC4 titanium alloy bar for a large aero-engine fan blisk and a preparation method of the large-specification TC4 titanium alloy bar, a large TC4 titanium alloy cast ingot with the diameter phi of 860-1000 mm is used and subjected to upsetting, drawing and cogging by 2-3 heating numbers, and the deformation amount of each heating number is controlled to be 40-70% for sufficient deformation; the method comprises the following steps of: performing upsetting and drawing for 3-7 heating numbers, controlling the deformation amount of each heating number to be 40-95%, controlling the upsetting and drawing temperature to be performed in a beta-phase region and a two-phase region, and controlling the change of a cooling mode after upsetting and drawing, finally converting the structure form into an equiaxed structure, and increasing the primary alpha-phase content in the structure to 70-90%, thereby obtaining the large-specification TC4 titanium alloy bar with good strength and plasticity. And the diameter phi of the bar is 400-800 mm, and the bar can be directly used for manufacturing the blisk, so that the processing and application potential of the titanium alloy is further widened, and the application field of the titanium alloy is enriched.

The invention relates to a magnetron sputtering cathode device, magnetron sputtering equipment and a coating method. The magnetron sputtering cathode device comprises: a cover plate assembly comprising a cathode cover plate and a dielectric window, the cathode cover plate covers a vacuum chamber, the cathode cover plate is provided with a mounting hole arranged in a penetrating manner, and the dielectric window is arranged on the cathode cover plate and seals the mounting hole; the coil is arranged on the dielectric window and located on the outer side of the vacuum chamber; the shielding cover is arranged in the vacuum chamber and corresponds to the dielectric window, the shielding cover is provided with a bent radio frequency channel, and the radio frequency channel is communicated with the dielectric window and the vacuum chamber on the two sides of the shielding cover; and the cathode assembly comprises a target material and a magnetic part, the target material is arranged in the vacuum chamber, and the magnetic part is arranged in the target material. Thus, radio frequency electromagnetic waves generated by the coil can enter the vacuum chamber through the radio frequency channel to improve the density of the plasma, and sputtering particles can collide with the inductively coupled plasma to improve the ionization rate of the target material, optimize crystal grains of a deposited film layer and improve the performance of a device.

The invention belongs to the technical field of magnesium-lithium alloy plastic processing, and particularly relates to a 400 MPa ultrahigh-strength magnesium-lithium alloy and a preparation method and application thereof. The 400 MPa ultrahigh-strength magnesium-lithium alloy consists of the following components in percentage by mass: 4.0 to 8.0 percent of Li; 4.5 to 7.5 percent of Zn; 1.3%-4.0% of RE (rare earth); 0.2 to 1.0 percent of Zr; 0.1 to 0.5 percent of Bi; and the balance of Mg. The ultrahigh-strength magnesium-lithium alloy is obtained by designing alloy components, controlling the mass ratio of Zn to Y, introducing a W phase, a quasicrystal phase, a magnesium-rare earth phase and a plurality of strong plastic phases and thermal stable phases and carrying out thermomechanical treatment. The preparation method of the ultrahigh-strength magnesium-lithium alloy mainly comprises the working procedures of high-temperature solid solution heat treatment, extrusion-hot rolling / cold rolling composite plastic deformation and the like, the tensile strength of the prepared ultrahigh-strength magnesium-lithium alloy reaches up to 400.5 MPa, the elongation is 9.4%, and a high-strength ultra-light metal structure material can be provided for the fields of aerospace, weaponry and the like; the method is applied to shells, supports, skins, cover plates and the like.

The invention discloses a method and a device for culturing integrated short-cut nitrification anaerobic ammonia oxidation granular sludge. The method comprises the following steps: sequentially connecting a biological selection tank, an aeration tank and a precipitation selection tank in an overflow manner; aerobic granular sludge and integrated short-cut nitrification anaerobic ammonia oxidation sludge are inoculated in the biological selection tank and the aeration tank, wherein the proportion of the integrated short-cut nitrification anaerobic ammonia oxidation sludge is 5%-10%. According to the method, aerobic granular sludge and short-cut nitrification anaerobic ammonia oxidation granular sludge have similar microbial layered structures, and rapid formation of the integrated short-cut nitrification anaerobic ammonia oxidation granular sludge based on microbial ecological niche conversion is promoted through ecological niche replacement of anaerobic ammonia oxidation bacteria. Part of effluent of the precipitation selection tank flows back, and the ascending velocity of liquid in the precipitation selection tank is increased to promote floc sludge elutriation and granular sludge enrichment. The method is convenient to operate and simple to control, can be applied to a continuous flow process, and is beneficial to quick start and stable operation of an integrated short-range anaerobic ammonia oxidation system.

The invention discloses a manganese-copper alloy material with stable resistance and a preparation method of the manganese-copper alloy material. The manganese-copper alloy material comprises the following components in percentage by mass: 11-13% of manganese, 0.5-1.5% of copper, 0.3-1% of indium and 0.05-0.15% of trace rare earth elements, the preparation method of the manganese-copper alloy material with stable resistance comprises the following steps: S1, premixing; s2, carrying out preforming; the method has the following beneficial effects that fine and uniform mixing is achieved through the microchannels and the like, and composition segregation is avoided; the pulse current preforming is efficient and rapid, and the boron nitride coating mold guarantees the quality and density uniformity of a preforming block; the self-adaptive air pressure regulation and control smelting system accurately controls the temperature, the air pressure and the speed of each stage, monitors and adjusts in real time, promotes atomic diffusion and alloying, improves the product quality and the qualified rate, reduces the rejection rate, and has the characteristics of efficient and stable production and wide application prospects.

The invention relates to a two-stage PD-HAP coupled Anammox synchronous nitrogen and phosphorus removal method in the technical field of sewage biochemical treatment, and aims to solve the problems that phosphorus cannot be removed by a PD / A process, phosphorus resources are difficult to recover and the like, short-cut denitrification and a hydroxyapatite process (PD / HAP) are combined, Anammox is synchronously coupled, the purpose of synchronous nitrogen and phosphorus removal is achieved, and phosphorus recovery can also be taken into consideration. The real-time control device is simple to operate, the reactor can be flexibly regulated and controlled, the reaction condition can be timely optimized, the total nitrogen removal rate is stabilized at 85%, and the phosphorus removal rate reaches 83%.

The invention relates to a high-formability anodizing 6xxx aluminum alloy plate and a preparation method thereof. The aluminum material is composed of the following components in percentage by mass: 0.2-0.6% of Si; 0.6%-1.1% of Mg; 0.01% to 0.04% of Ti; according to the preparation method disclosed by the invention, by regulating and controlling semi-continuous casting, hot rolling and cold rolling processes, the grain size of the finished aluminum alloy plate is uniform and fine, the average grain size is 20-60 microns, the surface roughness of the plate strip is 0.25-0.45 microns, the glossiness is 350-420 GU, the tensile strength is 70-90 MPa, the yield strength is 30-50 MPa, the elongation is 30-45%, and the hardness HV is 25-45; and after the plate is subjected to subsequent room-temperature stamping forming, the surface quality is excellent, the defects of scratches, orange peels, cracks and the like are avoided, and the technical requirements of high-end products on appearance decoration surfaces are met.

The utility model relates to the technical field of plastic granulators, and discloses a plastic granulator convenient to cut, which comprises a base, the top of the base is fixedly connected with a processing forming cylinder, the left side of the top of the processing forming cylinder is fixedly connected with a feed hopper, and a conveying mechanism is arranged in the processing forming cylinder. A cutting mechanism is arranged on the right side of the conveying mechanism. According to the plastic granulator convenient to cut, through the arrangement of the cutting mechanism, the purpose of mounting and dismounting a forming part can be achieved, through the arrangement of the forming part convenient to mount and dismount, when the forming part is blocked, the forming part can be dismounted and dredged in time, and the purpose of granulating regenerated plastic in the later period is ensured; the three cutting tools are arranged, the purpose of rapidly granulating the reprocessed plastic can be achieved under rotation of the three cutting tools, and meanwhile, the three cutting tools rotate in the center of a formed part, so that the purpose of conveniently cutting the reprocessed plastic can be achieved.

According to the high-grade non-oriented silicon steel with the high favorable texture ratio and the production method of the high-grade non-oriented silicon steel, primary cold rolling reduction, the reduction rate of each pass and the reduction rate of secondary cold rolling are regulated and controlled, meanwhile, the normalizing procedure is replaced with the high intermediate annealing temperature, the cost is reduced, and the production efficiency is improved. A large grain size is obtained before secondary cold rolling, a large number of shear bands are formed on the surface layer and the center layer of the cold-rolled sheet after secondary cold rolling, the area of the shear bands is far larger than the area of a grain boundary, the cold-rolled sheet is promoted to become a leading position of recrystallization nucleation, and meanwhile more {hk0} lt is achieved through a three-section continuous annealing process suitable for subsequent procedures; 001gt, 001gt; and {hkl} lt; 110gt, 110gt; grains of the texture grow up, grains of other orientations are increased, and {hkl} lt is further reduced; 111gt, 111gt; the proportion of the texture and the magnetic induction intensity B50 of the product are improved by more than 0.018 T, and B50 is greater than or equal to 1.66 T.

The utility model discloses an ultrasonic composite welding gun which comprises a connecting unit, a push-pull wire unit, a welding gun body and an ultrasonic transduction unit, and the connecting unit is fixedly connected to a motion execution structure during working; the wire pushing and drawing unit is arranged on the connecting unit and used for pushing welding wires; the welding gun body is arranged on one side of the wire pushing and drawing unit, and a welding wire penetrates through the welding gun body to reach a working area. A hollow wire penetrating part is formed in the ultrasonic transduction unit, the ultrasonic transduction unit is coaxially arranged between the wire pushing and drawing unit and the welding gun body, and during working, vibration acts on a welding wire. The novel ultrasonic composite welding gun mechanism is provided, the welding wire is subjected to ultrasonic vibration in a molten pool, crystal grains in condensed metal are improved, and the mechanical property is improved.

The invention relates to the technical field of medicine preparation, and discloses a rebamipide tablet and a preparation method and application thereof, the rebamipide tablet comprises 40-60 parts of rebamipide, 3-6 parts of polyethylene glycol, 20-30 parts of beta-cyclodextrin, 5-8 parts of an adhesive, 10-20 parts of a filler, 2-5 parts of a disintegrating agent, 0.1-1 part of a flow aid, and 1-3 parts of a lubricant. According to the rebamipide tablet, beta-cyclodextrin and PEG are combined for use, so that the electrostatic adsorption phenomenon of rebamipide is weakened, agglomeration among rebamipide molecules is prevented, the flowability of rebamipide particles is improved, and the prepared rebamipide tablet is higher in particle uniformity and faster and higher in dissolution rate. In the preparation method, the beta-cyclodextrin is firstly added, stirred and sheared, the PEG solution is sprayed, then the adhesive, the filler, the disintegrating agent and the glidant are added, and the lubricant is added, so that the preparation process is relatively smooth, the yield is increased, the content uniformity of the rebamipide tablet is improved, the tablet weight difference is reduced, the dissolution rate is accelerated, and the bitter taste of the rebamipide is covered.

The invention discloses a device and method for achieving friction extrusion additive manufacturing of metal pipe fittings based on stirring consumable rod preheating, the device comprises a hollow main shaft, a heating sleeve and a hollow inner shaft, the bottom end of the hollow inner shaft is connected with a shaft shoulder, and a circular through hole is formed in the center of the shaft shoulder; a flow dividing type spiral component used for promoting deposited metal to form a pipe fitting structure is arranged in the circular through hole, and a groove used for promoting plasticizing of the consumable rod is formed in the inner wall of the circular through hole of the shaft shoulder. Firstly, the consumable rod is heated to the needed temperature through the heating sleeve, under the driving of the upsetting pressure and the flow dividing type spiral component, the consumable rod gradually enters the round hole of the shaft shoulder in a flow dividing mode, after the round through hole is filled with plasticized metal, the plasticized metal overflows, and under the rotating effect of the shaft shoulder and the stirring effect of the protrusions, the consumable rod is heated to the needed temperature. The plasticized metal gradually fills the gap between the shaft shoulder and the surface of the substrate, and then the device is lifted by the height of the gap for further deposition until the deposited metal forms a tubular member on the surface of the substrate. According to the device disclosed by the invention, a metal tubular component with fine grains and excellent mechanical properties can be formed at any position of a formed part through a material adding method by adopting a mode that the hollow static inner shaft does not rotate, so that the manufacturing process is simplified.

The invention discloses an aluminum-scandium alloy and a preparation method and application thereof, and belongs to the technical field of rare earth alloy sputtering target materials, metal aluminum particles and metal scandium particles are used as raw materials, high vacuum is extracted, inert gas is introduced for multiple times of electric arc melting, aluminum-scandium alloy melt with uniform components is obtained, and after the aluminum-scandium alloy melt is cooled, the aluminum-scandium alloy is obtained. The method comprises the following steps: preparing an aluminum-scandium alloy ingot, carrying out induction heating on the aluminum-scandium alloy ingot prepared by electric arc melting to completely melt the alloy so as to obtain an alloy melt, guiding the alloy melt to be injected into a mold through an argon pressure difference, naturally cooling to form a primary alloy, and carrying out homogenizing annealing on the primary alloy under a vacuum condition to obtain the aluminum-scandium alloy. And eliminating the residual internal stress of the primary alloy to obtain the aluminum-scandium alloy. The aluminum-scandium alloy prepared through the method is low in oxygen content, high in density, fine in crystal grain, uniform in structure and good in machining performance.

The invention relates to a hydrogen fuel cell stainless steel bipolar plate surface composite coating and a preparation method thereof. The composite coating comprises a metal Cr transition layer, a CrN bottom layer, a metal Cr middle layer and a CrN surface layer which are sequentially arranged on a stainless steel bipolar plate. A metal Cr transition layer, a CrN bottom layer, a metal Cr middle layer and a CrN surface layer are sequentially deposited on a stainless steel bipolar plate through a physical vapor deposition method. Compared with the prior art, the corrosion-resistant and conductive coating for the stainless steel bipolar plate of the hydrogen fuel cell, provided by the invention, can solve the problems of poor corrosion resistance, insufficient conductivity and the like of the stainless steel bipolar plate in an acid environment of the hydrogen fuel cell.

The invention belongs to the technical field of steel and iron materials, and particularly relates to freeze-thaw-resistant frozen soil corrosion-resistant low-alloy structural steel and a preparation method thereof, the freeze-thaw-resistant frozen soil corrosion-resistant low-alloy structural steel adopts a component design completely different from that in the prior art to meet the freeze-thaw-resistant frozen soil corrosion-resistant requirements, meanwhile, the component design is simplified, and the cost is reduced. Zr-Ti-RE composite deoxidation and microalloying freeze-thaw-resistant steel controllable preparation is supplemented, the environmental fracture sensitivity is reduced, and the integrated design of the freeze-thaw-resistant steel component structure is achieved; through the low-carbon equivalent design, the steel plate has excellent welding performance; and Ti, Zr and RE composite microalloying is adopted, and TMCP rolling parameter regulation and control are matched, so that the steel plate is small in grain size and high in obdurability. The freeze-thaw corrosion resistant steel is particularly suitable for structural materials of plateau frozen soil roads, railways, bridges and the like used in low-temperature and freeze-thaw environments, and the material has the remarkable characteristics of high strength, easiness in welding, freeze-thaw resistance and the like besides low-temperature toughness and excellent performance.

The invention discloses a welding method for a high-purity aluminum target material, and belongs to the technical field of alloy target materials. The method comprises the following steps: firstly, turning a plane thread on a to-be-welded surface of a copper alloy back plate, then plating an aluminum film on the to-be-welded surface within a certain thickness range, then assembling the copper alloy back plate plated with the aluminum film and a high-purity aluminum target blank, and putting an assembled target assembly into a sheath for degassing treatment; finally, hot isostatic pressure diffusion welding is carried out under the condition that the temperature is larger than or equal to 200 DEG C; the aluminum-copper target material prepared by adopting the welding method provided by the invention has good welding bonding strength and can be better applied to sputtering at high temperature; and the high-purity aluminum target grains can be effectively prevented from abnormally growing through diffusion welding at low temperature.

The invention belongs to the technical field of energy storage, and particularly relates to a method for modifying a zinc negative electrode interface by using silver nanowires, which comprises the following steps: step 1, dispersing the silver nanowires with high length-diameter ratio into an organic solvent at a certain concentration; step 2, performing ultrasonic cleaning on the zinc foil, and then coating the silver nanowire dispersion liquid prepared in the step 1 on the surface of the zinc foil; 3, the zinc foil coated with the silver nanowire dispersion liquid in the step 2 is dried, and the zinc foil attached with the silver nanowires is obtained; and 4, the silver nanowires attached to the zinc foil in the step 3 are subjected to hot welding, and the zinc foil coated with the silver nanowire interconnection network is obtained. The silver nanowire conductive network formed on the surface of the zinc foil enables the current to be uniformly distributed, so that the formation and growth of zinc dendrites are inhibited, and the electroplating / stripping cycle time of the zinc negative electrode is remarkably prolonged; and the silver nanowire conductive network can also adjust the interface property of the zinc negative electrode and the electrolyte, reduce the corrosion current and enhance the stability of the electrode.

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 nano TiC reinforced 316L stainless steel with excellent high-temperature mechanical property, the content of TiC in the nano TiC reinforced 316L stainless steel is 4-6wt%, TiC is added in the form of nano powder, and the preparation process comprises the following steps: adding nano TiC powder into stainless steel powder, uniformly stirring, and carrying out heat treatment to obtain the nano TiC reinforced 316L stainless steel. Nano TiC powder is evenly attached to the specific surface of 316L stainless steel powder through grinding of a ball mill, then the ground mixed powder is put into laser additive manufacturing equipment, the nano TiC reinforced 316L stainless steel is obtained through laser additive manufacturing, and the technological parameters of laser additive manufacturing are as follows: the laser power is 150-500 W, the scanning speed is 400-1400 mm / s, the interlayer spacing is 0.04-0.1 mm, and the layer thickness is 0.01-0.05 mm; in the additive manufacturing process, argon is adopted as protective gas. The 316L stainless steel with the excellent high-temperature mechanical property can be obtained only through the additive manufacturing machining method, the high-temperature mechanical property of the 316L stainless steel can be comparable with that of nickel-based alloy, and the use environment and the application range of the 316L stainless steel are greatly expanded.

The invention discloses a preparation method of a large-size fine-grain yttrium target material, which comprises the following steps: carrying out vacuum melting to obtain a metal yttrium cast ingot, and carrying out surface machining to obtain a metal yttrium blank; the metal yttrium blank is subjected to vacuum heat treatment and vacuum forging, and then a metal yttrium forge piece is obtained; carrying out isothermal rolling on the metal yttrium forge piece in a protective atmosphere, and carrying out heat treatment in the protective atmosphere to obtain a metal yttrium rolled piece; and carrying out dry cutting on the metal yttrium rolled piece to obtain the yttrium target material. The metal yttrium target obtained through the preparation method is large in finished product size range and good in flatness, toughness is improved while strength is improved, crystal grains are small, the crystal grain size is uniform, compactness is good, the surface is smooth and free of defects, the purity and components of raw materials cannot be changed, the sputtering face is compact, and sputtering performance is good.