154results about How to "Improve the strengthening effect" patented technology

The invention relates to a hot-rolled wire rod for a 2100MPa-grade bridge cable and a manufacturing method of the hot-rolled wire rod, after the hot-rolled wire rod is formed by rolling high Si-Mn chemical components and spinning at the spinning temperature of more than or equal to 955 DEG C, the wire rod is cooled at the cooling speed of more than or equal to 36 DEG C / s through online molten salt sorbite regulation and control treatment, enters a sorbite phase region from an austenite state, promotes sorbite phase transformation and is subjected to isothermal treatment to remove stress; and finally, roller way slow cooling is conducted, the hot-rolled wire rod with the microscopic structure comprising tempered sorbite with the volume percentage larger than or equal to 95% and the balance being a mixed structure composed of ferrite and fused sorbite is prepared, deteriorated structures such as network carbide and martensite can be effectively controlled, wire rod structure regulation and control, strength and plasticity matching and stable production are achieved, and the effects that the tensile strength is 1500-1540 MPa, the tensile strength is high, and the tensile strength is high can be achieved. The composite material is used in the application fields of manufacturing of 2100MPa-grade ultrahigh-strength bridge cables and the like, and is beneficial to reduction of the risk of wire breakage.

The invention relates to a hot-rolled wire rod for a 2060MPa bridge cable and a manufacturing method of the hot-rolled wire rod, after C-Si-Mn-Cr-V-Nb component is rolled and spun into a wire rod, the wire rod is subjected to online molten salt strong isothermal treatment, so that the wire rod is cooled at a cooling speed of greater than or equal to 34 DEG C / s, and enters a sorbite phase region from an austenite state to form a structure mainly comprising fine lamellar spacing sorbite, and isothermal treatment is carried out; and finally, through roller way slow cooling, the hot-rolled wire rod with a microscopic structure mainly comprising tempered sorbite and the balance being a mixed structure composed of ferrite and microspheroidized carbide is prepared, a deteriorated structure influencing the performance of a wire rod finished product in the production process can be effectively controlled, stable production is achieved, and the strength and plasticity matching of the wire rod is improved. The tensile strength is 1440-1490 MPa, the percentage reduction of area is 42%-46%, and the method is suitable for efficient and stable production and manufacturing of the 2060 MPa bridge cable.

The invention relates to the technical field of building pipe piles, in particular to an improved precast pile in a collapsible loess area and a construction technology, the improved precast pile comprises a hollow steel pipe pile, and a receding hole is formed in the hollow steel pipe pile; the at least one guide insertion strip is rotationally connected with the hollow steel pipe pile, the rotating plane of the guide insertion strip is vertically arranged, the guide insertion strip extends into an inner cavity of the hollow steel pipe pile through the receding hole to form a linkage strip, the guide insertion strip and the linkage strip are both arranged in a hollow mode, and a plurality of grout outlets are formed in the guide insertion strip; an inner cavity of the hollow steel pipe pile communicates with the grout outlet through an inner cavity of the linkage strip. The rotation driving unit is movably arranged in an inner cavity of the hollow steel pipe pile, and the rotation driving unit is matched with the linkage strip to drive the guide insertion strip to rotate; the precast pile has the effects that the strengthening effect of the under-pressure concrete on the soil body around the precast pile is improved, and then the settlement amount of the precast pile is reduced when collapsible settlement occurs in the soil body.

The invention discloses a wear-resistant hard alloy and a preparation method and application thereof, and belongs to the technical field of hard alloys, and the wear-resistant hard alloy comprises the following components in parts by weight: 78.4-87.9 parts of tungsten carbide powder, 4-12 parts of high-entropy alloy powder, 2-8 parts of carbon nanotubes, 1-6 parts of titanium aluminum carbide and 0.1-0.6 part of tantalum carbide. The high-entropy alloy powder comprises, by weight, 1-3 parts of manganese powder, 2-5 parts of silicon powder, 5-12 parts of chromium powder, 10-15 parts of carbon powder, 10-15 parts of cobalt powder, 10-18 parts of molybdenum powder and 40-50 parts of nickel powder. The tungsten carbide powder comprises first tungsten carbide powder and second tungsten carbide powder in a weight ratio of (2-4): 1. The tungsten carbide powder serves as a matrix, under the combined action of the high-entropy alloy powder, the carbon nanotubes, the titanium aluminum carbide and the tantalum carbide, the wear resistance and the mechanical property of the hard alloy are remarkably improved, and the hard alloy can be well applied to preparation of cutting tools and drill bits and has wide application prospects.

The invention discloses a photomask defect identification method, and belongs to the technical field of photomask detection. The method comprises the following steps: S1, acquiring a surface defect image; s2, preprocessing the surface defect image based on the imaging characteristics of the defect; s3, performing filtering algorithm correction on the preprocessed surface defect image; s4, performing colorimetric analysis on the surface defect image corrected by the filtering algorithm to obtain a particle region; s5, on the basis of morphological characteristics of defects, segmenting the particle region to obtain defect islands; and S6, performing morphological analysis on the defective island to obtain a defect type and a defect size. The photomask defect identification method provided by the invention combines morphological and colorimetric analysis methods to automatically process the surface defect image and extract the defect island, improves the accuracy of defect identification, gets rid of the constraint of the difference of different equipment imaging systems, realizes automatic batch processing, and saves the manpower and material investment in the mass production link.

The invention relates to a low-carbon high-plasticity hot-rolled wire rod for a 1860MPa-grade stranded wire and a manufacturing method of the low-carbon high-plasticity hot-rolled wire rod. C-Si-Mn-Cr components are subjected to hot-rolled spinning to form a wire rod, and then the wire rod is subjected to online molten salt isothermal treatment, so that the wire rod is cooled at a cooling speed of greater than or equal to 34 DEG C / s and enters a sorbite phase region from an austenite state to form a structure taking sorbite as a main part, and isothermal tempering is carried out, so that the low-carbon high-plasticity hot-rolled wire rod is obtained. And finally, slow cooling is conducted through a roller way, the hot-rolled wire rod with the microstructure comprising not less than 89% of tempered sorbite and the balance of tempered ferrite and microspheroidized carbide is prepared, the carbon content can be reduced, the material cost can be further reduced, the export tax refund requirement can be met, the abnormal structure precipitation risk is effectively reduced, and the structure uniformity is improved. According to the method, the strength of the steel wire rod is matched with the high plasticity, the tensile strength is 1190-1240 MPa, the percentage reduction of area is 49%-54%, and the yield and the use performance of the 1860 MPa grade steel strand can be improved.

The invention discloses a gas turbine part protective coating material and a preparation method thereof, and is characterized in that a boron-doped TiHfTa medium entropy alloy is used as a binding phase of a WC-based coating, a coating prepared by laser cladding is subjected to precise rolling processing and aging heat treatment to form Ti-B, Hf-B and Ta-B complexes, and the complexes are subjected to heat treatment to form a WC-based coating. The W2Co21B6 phase and the hBN have an improvement effect on the high-temperature wear resistance, the oxidation resistance and the like of the coating. The problem that a coating prepared in the prior art is insufficient in protection performance is solved, and the coating can be used for protection of key parts of the gas turbine.

The invention provides a PBO chopped fiber reinforced aluminum matrix composite and a preparation method thereof, and belongs to the technical field of metal matrix composites.The preparation method comprises the steps that firstly, fibers are subjected to ultrasonic dispersion; 2, ball milling and powder mixing; step 3, spark plasma sintering; and 4, follow-up high-temperature annealing is conducted, the prepared PBO chopped fiber reinforced aluminum-based composite material is composed of a PBO chopped fiber reinforced body and an aluminum matrix, the composite material is high in density, the maximum tensile yield strength, the maximum tensile strength and the maximum bending strength all meet the high standard, in addition, the composite material further has the good plastic deformation capacity, and on the whole, the composite material has the good mechanical property. The composite material has outstanding comprehensive mechanical properties. In addition, the preparation process of the composite material is simple, rapid preparation of the PBO chopped fiber reinforced aluminum-based composite material can be achieved, and engineering application of the composite material can be promoted.

The invention discloses a method for realizing low-temperature strengthening and toughening of TRIP high-entropy alloy, which comprises the following steps: S1, low-temperature pre-stretching: carrying out low-temperature pre-stretching on the TRIP high-entropy alloy until the TRIP high-entropy alloy is stretched to a Luders strip deformation end point or a stretching stress-strain curve stress platform end point, and then unloading; and S2, heat treatment is conducted, specifically, heat preservation treatment of the TRIP high-entropy alloy is conducted between the room temperature and the melting point temperature, and then rapid cooling is conducted through a cooling medium. According to the method for achieving low-temperature strengthening and toughening of the TRIP high-entropy alloy, low-temperature pre-stretching and heat treatment are adopted, the high-entropy alloy with two phase structures and two grain size characteristics is prepared, the low-temperature yield strength can be remarkably improved through a fine grain structure, residual dislocation and back stress caused by deformation of the two grain sizes, and the low-temperature strengthening and toughening of the TRIP high-entropy alloy can be achieved. And the deformation coordination between different grain sizes and phase structures can also ensure that the low-temperature plasticity is not reduced, so that the TRIP high-entropy alloy has high strength and high plasticity in a low-temperature environment, and the TRIP high-entropy alloy shows excellent low-temperature mechanical properties.

The utility model relates to the technical field of alloy metal processing devices, in particular to an alloy metal surface laser shock peening device which comprises a machine frame, an adjusting mechanism is arranged in the machine frame, a clamping mechanism and a laser processing mechanism are arranged above the machine frame, a stand column is fixedly installed on the outer wall of one side of the machine frame, and a laser processing mechanism is arranged on the stand column. A water tank is installed at the top of the stand column through bolts, one side of the water tank communicates with a flexible pipe, and the side, close to the laser head, of the flexible pipe communicates with a spraying head. The spraying head is arranged beside the laser head, the spraying head sprays and cools the laser head through water flow guided out from the water tank through the flexible pipe, the situation that the temperature of the laser head is too high in the continuous working process is avoided, and therefore the fatigue life of the laser head working at the high temperature is effectively prolonged; spraying water for cooling the laser head flows to the waste water recycling cavity below through the lower water tank, waste water can be recycled, and the waste water utilization rate is increased.

The invention belongs to the technical field of organic solid waste treatment, and particularly discloses nitrogen and iron doped hydrothermal carbon and a preparation method and application thereof.The preparation method includes the following steps that a biogas slurry and biogas residue mixture obtained after anaerobic fermentation of excrement, fruit tree residues and high-iron sludge are evenly mixed according to the solid-to-liquid ratio of 1: 6-1: 10, hydrothermal carbonization is conducted, and the mass ratio of the fruit tree residues to the high-iron sludge is 1: 4-1: 6; the reaction is closed in the hydrothermal carbonization process, nitrogen is introduced, the hydrothermal carbonization temperature is 180-260 DEG C, and the hydrothermal carbonization time is 1-3 h; and carrying out solid-liquid separation on the hydrothermal product to obtain a solid product and a hydrothermal waste liquid, and drying the solid product to obtain the dry nitrogen and iron doped hydrothermal carbon. Aiming at the problem that the biogas slurry is difficult to return to the field, the biogas residue and biogas slurry mixed liquid is used as a raw material for hydrothermal carbonization, the nitrogen-iron doped hydrothermal carbon is prepared through hydrothermal carbonization reaction by utilizing the high-nitrogen characteristic of the biogas residue and biogas slurry mixed liquid and coupling the high-iron characteristic of the high-iron sludge, and compared with common hydrothermal carbon, the nitrogen-iron doped hydrothermal carbon has a better anaerobic fermentation strengthening effect.

The invention relates to a strontium titanate / boron nitride nanotube composite ceramic core block and a preparation method and application thereof, the composite ceramic core block is prepared from strontium titanate and boron nitride nanotubes, and the mass percent of the boron nitride nanotubes in the strontium titanate / boron nitride nanotube composite ceramic core block is 0.1-3%. The preparation method comprises the following steps: slowly adding obtained surface modified boron nitride nanotube slurry into strontium titanate slurry to obtain strontium titanate / boron nitride nanotube slurry; heating and stirring the strontium titanate / boron nitride nanotube slurry to obtain strontium titanate / boron nitride nanotube composite powder; the strontium titanate / boron nitride nanotube composite powder is subjected to pellet blank compression molding and sintering, and the strontium titanate / boron nitride nanotube composite ceramic pellet is obtained. Compared with the prior art, the heat conduction and mechanical properties of the 90SrTiO3 ceramic core block can be effectively improved.

The invention belongs to the technical field of micro-arc oxidation surface treatment, and particularly relates to a preparation method of an aluminum alloy black wear-resistant micro-arc oxidation ceramic membrane, which mainly comprises the following steps: 1) preparing a micro-arc oxidation solution which comprises the following components: an oxidation film growth agent, a complexing agent, a coloring agent, a hardening agent and a nano-particle colloidal dispersant; (2) bipolar pulse current parameters and a current given strategy are controlled for micro-arc oxidation treatment, the positive / negative current frequency ranges from 200 Hz to 1200 Hz, the positive and negative current duty ratio ranges from 4% to 18%, the given current value is gradually increased along with voltage increase, and the growth speed of an oxidation film is made to be balanced. The problem that the hardness and the wear resistance of the black micro-arc oxidation film layer are insufficient is solved, the hardness and the wear resistance of the black micro-arc oxidation film layer are remarkably improved while the blackness of the micro-arc oxidation film layer is not lost, and the application range of the aluminum alloy black micro-arc oxidation film is widened.

The invention relates to a heat-treatment-free high-toughness aluminum-magnesium-silicon alloy and a preparation method thereof, belongs to the technical field of aluminum alloys, and solves the problems that a heat-treatment-free aluminum alloy in the prior art is not high in toughness and cannot meet the production of large thin-wall components. The invention relates to a heat-treatment-free high-toughness aluminum-magnesium-silicon alloy, which comprises the following elements in percentage by mass: 7 to 9 percent of Mg, 2 to 3 percent of Si, 0.1 to 0.4 percent of Mn, 0.05 to 0.2 percent of Ti, 0.05 to 0.1 percent of Zr, 0.01 to 0.05 percent of B, 0.01 to 0.1 percent of Cu, 0.05 to 0.2 percent of Zn, 0.05 to 0.1 percent of Ca, 0.05 to 0.1 percent of RE, 0.003 to 0.005 percent of Be, 0 to 0.15 percent of Fe, less than or equal to 0.15 percent of other uncontrollable impurity elements and the balance of Al. And preparation of the heat-treatment-free high-toughness aluminum-magnesium-silicon alloy is achieved.

The invention discloses a polylactic acid-based nanofiber membrane as well as a preparation method and application thereof, and belongs to the technical field of air filtering membrane materials, fibers of the polylactic acid-based nanofiber membrane provided by the invention are formed by compounding an electroactive heterostructure layer and a dextrorotation polylactic acid layer, and the electroactive heterostructure layer is formed by a levorotation polylactic acid layer, an electret and a nucleating agent. According to the polylactic acid-based nanofiber membrane prepared by the preparation method disclosed by the invention, the PMs filtering efficiency reaches 99.0%-99.99%, the surface potential is maintained at 12 kV to 18 kV, the breathing resistance is 90 Pa to 180 Pa, the antiviral efficiency is 99.0%-99.98%, and the bacteria filtering efficiency is 99.2%-99.98%. According to the invention, the electroactivity and hydrophobicity of the nanofiber membrane are enhanced by combining a polylactic acid interface stereochemical compound with an electroactive heterostructure, so that the nanofiber membrane has the characteristics of fouling resistance (microorganisms, blood, dyes and the like) and high air filtration performance.

The invention discloses a novel high-strength and high-thermal-conductivity magnesium alloy material which comprises the following components in percentage by mass: 0.8-4.4% of Zn, 0.1-0.3% of Cu, 0.1-0.3% of Ca, 0.3-0.5% of Zr and the balance of Mg and inevitable impurities. The invention also provides a preparation method. The preparation method comprises the following steps: S1, preparing the raw materials according to the proportion; s2, a refining agent is prepared, then the raw materials prepared in the step S1 are melted in sequence and then stand for a period of time, then the raw materials are mixed with the refining agent, Mg alloy melt is obtained, and the temperature of the Mg alloy melt is controlled within a specific range; s3, casting the Mg alloy melt in the S2 into a metal mold, taking out the Mg alloy melt after the Mg alloy melt is solidified, slowly immersing the Mg alloy melt into water, and cooling to obtain an Mg alloy cast ingot; s4, preserving the heat of the Mg alloy cast ingot prepared in S3 for a period of time at a specific temperature, and then slowly immersing the Mg alloy cast ingot in water for cooling to obtain a T4-state Mg alloy cast ingot; and S5, the T4-state Mg alloy cast ingot obtained in the step S4 is subjected to heat preservation for a period of time at the specific temperature and then is subjected to air cooling, and a T6-state Mg alloy cast ingot, namely the magnesium alloy material, is obtained.

The soil loosening equipment comprises a loosening equipment body, the loosening equipment body comprises a main frame, a driving box is fixedly installed in the middle of the interior of the main frame, and supporting frames are arranged at the joints of the two ends of the upper surface of the main frame and the top end of the driving box; the end part of the driving box is in driving connection with a driving shaft; by designing a reinforced fixing mechanism, after a fixing bolt penetrates through a mounting hole to fixedly mount a driving shaft and an external connecting shaft, the outer surface of the fixing bolt is in close contact with the inner surface of an inner supporting plate, and a threaded rod is rotated again to drive a rotating ring to rotate in a movable connecting frame; and a threaded rod moves to drive a movable connecting frame and an anti-skid reinforcing plate to stably move to be clamped and fixed to the surface of the other side of the fixing bolt so as to reinforce and fixedly install the bolt, after the loosening equipment body is installed, the bolt is not prone to loosening or falling off when the driving shaft is stressed, and operation and use are safe.

The present invention discloses a large-area adsorption mineralization device and method for carbon-enhanced recycled concrete, including: a crushing and impurity removal part, including a primary impurity removal unit, a jaw crusher, and a secondary impurity removal unit sequentially installed on the ground, for removing impurities from waste concrete before and after crushing; a regeneration and strengthening part, for strengthening the concrete after crushing and impurity removal; a mobile transfer part, which is mainly composed of a transfer track on the ground, one end of which extends to the bottom of the discharge port at the bottom of the vertical mixing box, and the other end extends to the box of the processing and maintenance part, and at the same time, one side of the transfer track is also extended with a parallel monitoring track line and a return track line; a quality monitoring part, which is used to detect the performance indicators of the sample concrete. The present invention saves the cost of preparing high-performance recycled concrete and improves preparation efficiency and quality control by integrating the impurity removal, crushing, strengthening, processing, quality inspection, and return of carbon-enhanced recycled concrete into one device.

The invention discloses a preparation method of a 700MPa-grade ultra-fine grain aseismic steel bar with ultra-high strength. The 700 MPa grade ultra-high strength ultra-fine grain aseismic steel bar is prepared from the following chemical components in percentage by weight: 0.27 to 0.29 weight percent of C, 0.70 to 0.80 weight percent of Si, 0.60 to 0.70 weight percent of Mn, 1.05 to 1.15 weight percent of Cr, 0.165 to 0.180 weight percent of V, 0.012 to 0.016 weight percent of Nb, less than or equal to 0.030 weight percent of S, less than or equal to 0.030 weight percent of P, less than or equal to 0.0040 weight percent of O, 0.0300 to 0.0350 weight percent of N and the balance of Fe and inevitable impurities. The yield strength of the steel is 710-745 MPa, the tensile strength of the steel is 895-950 MPa, the maximum force total elongation of the steel is larger than or equal to 10.0, and the ferrite grain size of the steel is 12.5-14.0. According to the process, chemical component design, converter smelting, deoxidation alloying, argon station treatment, LF furnace refining, continuous casting, a steel rolling heating schedule, rolling temperature and a controlled cooling process are integrated and innovated, so that multiple strengthening effects of precipitation strengthening, fine grain strengthening, structure strengthening and the like are fully exerted; the produced reinforcing steel bar has the advantages of excellent and stable high-strength performance, fine and uniform microscopic structure, excellent corrosion resistance, excellent anti-seismic performance and the like, and has remarkable economic and social benefits.

The invention discloses a device and method for preparing gradient nanostructures on the inner and outer walls of a metal pipe, and belongs to the technical field of machining of the inner and outer walls of the metal pipe. The problems that in the prior art, a device for preparing the gradient nanostructure on the metal pipe wall is complex in structure, and the gradient nanostructure cannot be prepared on the inner wall and the outer wall of a metal pipe at the same time are solved. A first fixing device, a pipe outer wall rolling device and a second fixing device are arranged on the mounting platform, the first fixing device is provided with a pipe rotating device and reciprocates relative to the pipe outer wall rolling device, and the second fixing device is provided with a pipe fixing device and a pipe inner wall rolling device. And the inner cutter and the outer cutter are oppositely arranged when the metal pipe is processed to prepare the gradient nanostructure. The device and method for preparing the gradient nanostructures on the inner wall and the outer wall of the metal pipe are used for preparing the gradient nanostructures on the inner wall and the outer wall of the metal pipe, the device is simple in structure, and the gradient nanostructures can be prepared on the inner wall and the outer wall of the metal pipe at the same time at low cost.

The invention relates to the technical field of precious metal alloy material manufacturing, in particular to a process for hardening treatment of gold through micro-nano metal powder, which comprises the steps of blank charging, smelting, vacuum ingot casting, surface cleaning, rolling stretching and age hardening, product surface treatment, product welding and the like. The method has the advantages that in the aspect of material selection, the micro-nano metal powder, such as titanium powder and cobalt powder, is diversified and is small in adding amount, various strengthening mechanisms can be provided, and the economical efficiency is guaranteed. The smelting process is accurate, good vacuum and temperature control is achieved, and stirring is uniform after micro-nano metal powder is added. And rapidly solidifying the cast ingot by using a water-cooling copper mold, treating the surface by using aqua regia and the like, and drying. Midway annealing can be executed through rolling and stretching, and the process is flexible. Product manufacturing processes are diversified, and surface treatment includes polishing, electroplating, coloring and the like. Advanced modes such as laser are adopted for welding to avoid hardness reduction. According to the process, the gold hardening treatment effect and quality are improved from multiple aspects, different requirements are met, and wide application prospects are achieved.

This invention discloses a method for infiltrating ultra-low chromium copper into copper-tungsten contact materials using a vacuum sintering process, comprising the following steps: S1, pressing tungsten powder into a blank; S2, degumming the tungsten blank; S3, preparing the copper matrix; S4, unloading the blank; S5, sintering and infiltrating; and S6, solution treatment and aging. In the copper-tungsten contact material infiltrated with ultra-low chromium copper using the vacuum sintering process of this invention, the Cr content is approximately 0.025 wt.%. This ultra-low Cr content provides excellent strengthening of the contact material, resulting in a hardness ≥78 HB and a conductivity ≥55 Ms / m, thus compensating for the insufficient conductivity of chromium copper while meeting the hardness requirements of copper.

This invention discloses a free-machining high-strength aluminum-lithium alloy, its preparation method, and its applications, belonging to the field of alloy materials technology. The free-machining high-strength aluminum-lithium alloy has the following weight percentages of elements: Li: 3.5–5.5%, Cu: 2.6–3.1%, Zn: 6.8–7.1%, Mg: 2.1–3.0%, Y: 1.5–4.0%, Bi: 0.85–1.05%, In: 0.05–0.08%, Cr: 0.05–0.45%, Ti: 0.02–0.04%, with the balance being Al. This invention involves batching, smelting, refining, online refining, online degassing and filtration, casting, homogenization, extrusion, and two-stage aging treatment to finally obtain a free-machining high-strength aluminum-lithium alloy with a uniform microstructure. This invention has a reasonable component ratio, low manufacturing cost, and the resulting product has excellent strength and hardness, and exhibits excellent surface finish after dry machining.

The invention relates to the technical field of ceramic powder metallurgy, and discloses a whisker orientation enhanced ceramic core and a preparation method thereof.The preparation method specifically comprises the steps that metallization treatment is conducted on ceramic whiskers, and composite powder with the ceramic whiskers as the core and the metal phase as the shell is obtained through a chemical plating method; adding the refractory material powder and the composite powder into the light-cured resin according to the proportion, and uniformly dispersing the refractory material powder and the composite powder in the light-cured resin through planetary ball milling; forming a ceramic core biscuit through 3D printing and photocuring, and meanwhile, applying a magnetic field to regulate and control the orientation of the composite powder; and after the ceramic core biscuit is buried, the whisker orientation enhanced ceramic core is obtained through high-temperature sintering. The preparation process is simple, the crystal whiskers are good in dispersity, the bonding strength of the crystal whiskers and the matrix is high, oriented arrangement of the composite powder with the core being the ceramic crystal whiskers and the shell being the metal phase is effectively achieved, and especially in the thin portion of the ceramic core, the mechanical property of the ceramic core can be effectively improved through crystal whisker orientation.

The invention belongs to the technical field of cast aluminum alloys, and particularly relates to a cast aluminum rare earth high-entropy alloy and a preparation method and application thereof. The cast aluminum rare earth high-entropy alloy is prepared from the following raw material components in percentage by weight: 0.10 to 0.25 percent of Sc, 0.10 to 0.25 percent of La, 0.10 to 0.25 percent of Ce, 0.10 to 0.25 percent of Pr, 0.10 to 0.25 percent of Nd and the balance of aluminum. In the aluminum rare earth high-entropy alloy, the five rare earth elements including Sc, La, Ce, Pr and Nd exist according to the equal weight ratio or equal molar weight ratio and have the synergistic effect, the defect of combination of one or two elements is overcome, the strengthening effect of each rare earth element is improved, the cocktail effect is achieved, and the casting performance and mechanical performance of the aluminum alloy are improved.

The invention discloses a heavy-duty corrugated paper packaging box connected without glue and nails. The packaging box is composed of an end cover and a surrounding box. The end cover includes a cover body. The outer periphery of the cover body is connected to a cover body side wall. The cover body side wall and the cover body enclose an open accommodation space, and the surrounding box is adapted to be plugged into the accommodation space of the end cover. The end cover is formed by folding the cover body side wall relative to the cover body according to the die-cutting pressure line of the corrugated paper material. After folding, a stable end cover is formed. The top and bottom of the surrounding box are respectively adapted to be inserted into the two end covers for fixing, so that a packaging box with a solid structure is obtained. The packaging box does not need to be connected with iron nails or glue, has a simple structure, and can be assembled by only one staff member, with low labor cost. At the same time, before use, the end cover and the surrounding box can be stored and transported in a plane structure, which can save more than 50% of space compared with traditional corrugated paper packaging boxes. Not using iron nails or glue for connection also has the effect of saving resources and being green and environmentally friendly. There are no structures such as iron nails outside the packaging box, and the appearance is high.

The present invention relates to a Yb-Sc alloyed ultra-high strength Al-Mg-Zn-Ag alloy and a preparation method thereof. The alloy is composed of the following components in mass percentage: Mg 4.0-10.0%, Zn 2.0-6.0%, Ag 0.1-3.0%, Zr 0.05-0.2%, Mn 0.05-0.3%, Yb 0.01-0.2%, Sc 0.01-0.08%, Mg / Zn mass ratio 1.5-4.5, and the remainder is Al. The preparation method is: according to the designed aluminum alloy component ratio, each component is weighed, and an ingot is formed by smelting and casting, and then subjected to two-stage soaking treatment, rolling or hot extrusion, solid solution and two-stage aging heat treatment. The present invention can regulate the distribution and morphology of the microstructure and precipitated phase by regulating the composition and process of the alloy, obtain excellent comprehensive performance, and can be suitable for industrial production.

The invention provides a temporary plugging agent and a preparation method thereof. Raw materials of the temporary plugging agent comprise resin and modified particles, and raw materials of the modified particles comprise rigid particles wrapped by composite membranes and a modifier; the modifier is a mixture containing a silane coupling agent and a film-forming agent; the composite membrane is prepared from polyethyleneimine, polyallylamine hydrochloride and nano silicon dioxide. The preparation method of the temporary plugging agent comprises the following steps: sequentially immersing rigid particles into a polyallylamine hydrochloride solution, a nano silicon dioxide dispersion liquid, a polyethyleneimine solution and a nano silicon dioxide dispersion liquid, and repeating for 20-100 times to obtain rigid particles wrapped by a composite film; mixing the rigid particles wrapped by the composite film, a silane coupling agent and a film-forming agent, and heating to obtain modified particles; and mixing the modified particles with resin, and curing to obtain the temporary plugging agent. The temporary plugging agent provided by the invention has good toughness and relatively high strength, and can be used for plugging the interior of a crack through good deformability.

The invention discloses a method for preparing an ODS-TA15 titanium alloy through additive manufacturing, and belongs to the technical field of high-performance metal material preparation.The method comprises the steps that TA15 alloy powder prepared through a gas atomization method and nanometer yttrium oxide Y2O3 powder are subjected to mechanical ball milling and mixed to be uniform, TA15 + xY2O3 composite powder is obtained, and then the TA15 + xY2O3 composite powder is put into a vacuum drying oven to be dried; then the composite powder obtained through treatment is subjected to SLM forming, and a TA15-xY2O3 alloy block is obtained; and finally carrying out annealing heat treatment. According to the TA15 alloy and the preparation method thereof, the nano Y2O3 particles are introduced into the TA15 alloy, phase interface migration can be hindered during annealing treatment, an alpha phase and a beta phase are not prone to growing, the structure refining and strengthening effect is achieved, in addition, the dispersively-distributed nano Y2O3 particles can achieve the dispersion strengthening effect, and therefore the alloy shows good high-temperature mechanical performance.