17results about How to "Reduce anisotropy" patented technology

The application discloses an insect exoskeleton morphological layup composite panel, a sandwich structure and a preparation method. The sandwich structure comprises two pieces of bionic layup composite panels and a piece of aramid honeycomb core layer. The bionic layup composite panel draws lessons from the spiral stacking microstructure of the insect exoskeleton, the layup design considers the symmetry and balance requirements of the composite material, a fixed rotation angle is introduced between adjacent fiber layers, and the rotation angle is taken as a period of 180 degrees, and after a plurality of periods are laid and heat-pressed and cured, the bionic layup composite panel is obtained. The bionic layup design effectively reduces the interlaminar shear stress of the composite material, weakens the inherent anisotropy of the composite material, and improves the transverse bearing capacity and impact resistance. The bionic layup composite panel and the aramid honeycomb core layer have the advantages of high specific strength, high specific stiffness, impact energy absorption, vibration and noise reduction, electromagnetic shielding and the like, and a structure and function integrated material with more excellent comprehensive performance is obtained, and the structure and function integrated material is expected to be widely used in main load-bearing structures of various spacecrafts.

The application discloses a short-process low-cost Ti-55531 high-strength titanium alloy rod forging method and belongs to the technical field of titanium alloy material processing. The method comprises the following steps: material preparation, first high-temperature forging, second high-temperature forging, surface treatment, low-temperature upsetting and drawing and redrawing, continuous hexagonal drawing and rolling forming. The forging and rolling are regarded as necessary processes after each drawing by optimizing heating process parameters and deformation time sequence, combined with the cooperative process of reversing upsetting and drawing and rapid water quenching, the organization evolution is accurately controlled, the efficiency and uniformity are improved by adopting the multi-fire continuous deformation mode, and finally the processing loss is reduced by precise forming, so that the efficient and economic preparation of high-performance rods is realized.

This invention relates to the field of high-performance steel heat treatment equipment technology, and discloses a heat treatment method for eliminating anisotropy in stamped parts, comprising five stages: pretreatment, gradient temperature-controlled annealing, magnetic field-assisted regulation, integrated cooling, and post-treatment. This invention innovatively employs thickness-layered gradient temperature control, pulsed magnetic field-assisted grain boundary regulation, a micron-level high-precision temperature control system, and integrated closed-loop control of annealing and cooling to achieve precise control of the microstructure: the average grain size of the steel is ≤2μm, grain uniformity is ≥92%, tensile strength is ≥1200MPa / 950MPa, elongation is ≥25%, and the strength-ductility matching coefficient is improved by more than 40% compared to traditional processes; process repeatability error is ≤3%, microstructure recovery and softening rate is ≤5%, and residual stress elimination rate is ≥95%; achieving synergistic optimization of strength and ductility, it can be widely applied in high-end equipment manufacturing fields such as aerospace, nuclear fusion devices, and extreme cold environment engineering.

The invention provides a low-cost and low-anisotropy titanium alloy thin plate and a preparation method thereof. The method comprises the steps that a titanium alloy plate blank is prepared through multi-fire forging, and surface treatment and coating are sequentially conducted on the titanium alloy plate blank; heating to 50-100 DEG C above the phase transformation point, keeping the temperature, and carrying out rough rolling and coiling; after uncoiling and flattening, width cutting and blanking are carried out in the direction perpendicular to the rough rolling direction; heating to 30-50 DEG C above the phase transformation point, preserving heat, immediately discharging and water-cooling, and then performing alkali-pickling for the first time; reversing rolling and multi-heating-number rolling until the thickness of a hot semi-finished product is reached; after annealing and second-time alkali and acid pickling, multi-rolling-process cold rolling is conducted to the target thickness, and intermediate annealing is conducted between every two adjacent rolling processes; performing recrystallization annealing treatment; edge cutting and head and tail cutting are conducted, and a bell-type furnace is adopted for pressing and straightening; and carrying out third alkali-pickling to obtain the titanium alloy sheet. According to the method, rolling, homogenization treatment, reversing rolling and multi-rolling-process cold rolling are combined, and the technical problem that in titanium alloy sheet preparation, structure performance and cost control cannot be considered at the same time is solved.

This rubber composition contains: 100 parts by mass of a rubber component (A) containing an ethylene propylene diene monomer (EPDM) and a butadiene rubber (BR); 26.5 to 69.5 parts by mass of a filler component (B) containing microfibrillated cellulose and carbon black; and 2-6 parts by mass of an organic peroxide crosslinking agent (C), in the rubber component (A), the EPDM is 65-88 parts by mass and the BR is 12-35 parts by mass, and in the filler component (B), the microfibrillated cellulose is 1.5-4.5 parts by mass and the carbon black is 25-65 parts by mass.

The application discloses a low-cost high-strength aluminum-lithium alloy for a space cabin body and a preparation method thereof, and belongs to the technical field of aluminum-lithium alloys.The aluminum-lithium alloy comprises the following components in mass fraction: 91.5-94.5 parts of aluminum, 3.9-4.2 parts of copper, 1.0-1.5 parts of lithium, 0.2-1.0 parts of magnesium, 0.2-0.4 parts of silver, 0.3-0.8 parts of zinc, 0.10-0.12 parts of zirconium and 0.15-0.25 parts of mixed rare earth; the mixed rare earth is a mixed rare earth of cerium and lanthanum, and the mass ratio of cerium to lanthanum is (1.5-2.5):1; the total mass of metal impurities in the aluminum-lithium alloy is not more than 0.15 parts, and the single metal impurity is not more than 0.05 parts; through multi-component micro-alloying design and a precise controllable thermal mechanical treatment process, the application solves the technical problems that the existing aluminum-lithium alloy is high in cost due to the dependence on high-content noble metals and is anisotropic in mechanical properties due to strong deformation texture, and provides an ideal material which is excellent in comprehensive performance and economically feasible for a space cabin structure.

The application discloses a high-sulfur manganese free-cutting steel MnS inclusion modification preparation method and belongs to the technical field of steel metallurgy. The application forms fine and dispersed rare earth manganese sulfur oxides in the steel through a strict smelting process, and the rare earth manganese sulfur oxides serve as the nucleation core of MnS inclusions in the solidification process, so that the MnS is attached to the surface of the nucleation core to generate composite inclusions. The spheroidization of the rare earth inclusions can reduce the length-width ratio of the MnS inclusions, reduce the anisotropy of the steel, realize the modification of the inclusions and further improve the performance. Through LaMn alloy modification treatment, the morphology of the MnS in the high-sulfur manganese medium-carbon free-cutting steel is improved, the MnS is changed from a strip shape or a chain shape into a fine and uniformly distributed spherical shape or a near-spherical shape, stress concentration is effectively reduced, the Mn content in the steel is also improved, the steel is not infinitely intermingled with the matrix, and the mechanical performance and the cutting performance of the steel are significantly improved.

According to the high-strength and high-plasticity FeNiAl eutectic high-entropy alloy and the preparation method thereof, through the collaborative design of B microalloying, homogenization, cross cold rolling deformation and medium-temperature heat treatment optimization, a fine and uniform eutectic lamellar structure and a high-density dislocation structure are formed in a plate, the brittleness brought by an as-cast coarse structure is effectively relieved, and the high-strength and high-plasticity FeNiAl eutectic high-entropy alloy is obtained. The tensile strength and the yield strength are remarkably improved, meanwhile, high ductility and fracture resistance are kept, and the performance anisotropy caused by the rolled texture is further weakened. The technological process is simple, parameters are easy to control, and the method is suitable for industrial amplification application and is suitable for high-temperature structural parts, molds, impact load components and other scenes with high requirements for comprehensive mechanical properties of materials.

The invention relates to the technical field of aluminum alloy plate production, and provides a rolled aluminum alloy plate aging treatment method which comprises the following steps: carrying out pre-stretching treatment on a rolled aluminum alloy plate; the value of the pre-stretching deformation is substituted into a dislocation formula, and the dislocation density is determined; the dislocation density is substituted into a parameter formula, and the heat preservation temperature and the heat preservation time of first-stage aging are determined; and primary aging treatment and secondary aging treatment are conducted on the plate. Therefore, the dislocation density of the test sample is analyzed and detected through X-rays, and the function relation of the dislocation density, the pre-stretching deformation amount and the first-level aging parameter is constructed. Primary aging parameters can be accurately set according to the pre-stretching deformation amount, so that the plate presents slight overaging in the length direction and slight insufficient aging in the width direction, the strengthening effects in the two directions are equivalent, and the distribution uniformity of precipitated phases in the length and width directions of the plate in the subsequent aging process is ensured; the anisotropy of the mechanical property of the plate is reduced.

The application relates to the technical field of martensitic steel, in particular to a martensitic steel ring-shaped forge piece, the ferrite in the structure of the ring-shaped forge piece is uniformly granularly distributed, the transverse tensile strength of the ring-shaped forge piece is 1214-1235 MPa, the elongation after fracture is 13.5%-14.0%, and the average impact energy is greater than or equal to 50 J; the ring-shaped forge piece is prepared through a heat treatment process of high-temperature tempering pretreatment, ultrahigh-temperature treatment, standard quenching treatment and twice tempering treatment. The martensitic steel ring-shaped forge piece provided by the application solves the problem of low transverse plasticity and impact performance of the martensitic stainless steel ring-shaped forge piece, and the ultrahigh-temperature treatment and tempering are adopted to realize the optimization and adjustment of the structure form and performance, so that the transverse plasticity and impact energy indexes of the material meet the standard requirements of GB / T 1220.

This invention discloses a method for preparing conductive ceramics, the resulting products, and their applications. The invention uses alumina powder, coal gangue powder, fly ash powder, and organic carbon source as matrix raw materials, and polyvinyl alcohol as a binder, employing a rapid hot-pressing, high-temperature sintering, carbothermal reduction process to prepare conductive ceramics. This invention features a simple process, low cost, low energy consumption, high production efficiency, and good environmental performance, making it easy for industrial production. The resulting conductive ceramics exhibit high mechanical properties, good conductivity, and low resistance, making them a preferred material for indoor heaters, electromagnetic shielding devices, high-temperature sensors, aerospace thermal protection systems, and aero-engine applications.

The application discloses a fine-grained pure titanium plate and a preparation method thereof. The preparation method comprises the following steps: performing alternative phase change rolling on the plate: rolling the plate in a high-temperature beta phase zone and a low-temperature alpha phase zone for multiple cycles, and returning the plate to 880+ / -5 DEG C after each cycle; changing the rolling path of the plate for multi-directional rolling in multiple cycles in the alternative phase change rolling, and synchronously applying pulse current auxiliary treatment; and slowly cooling the plate after the alternative phase change rolling is completed. Through the synergistic process of the alternative phase change rolling, the multi-directional rolling, the pulse current auxiliary treatment and the slow cooling, three-dimensional uniform refinement of the grain size is realized, the complex process flow of the traditional fine-grained preparation is simplified, energy consumption and equipment cost are reduced, and an industrialized solution is provided for high-end titanium material application in the fields of aerospace, biological medicine and the like.

The application provides a short-process preparation method of titanium plate with weak anisotropy and high strength and plasticity, which comprises the following steps: firstly, high-purity titanium sponge is smelted in an electron beam cold hearth furnace to obtain large-scale straight rolling flat ingot after face milling and grinding; then, the straight rolling flat ingot is cut into several block billets with appropriate specifications, the block billets are heated to above the beta phase transition point, and then two-time hot rolling is performed, the first-time hot rolling direction is perpendicular to the second-time hot rolling direction, after each pass rolling, straightening, correction, acid-alkali cleaning and grinding treatment are performed on the plate billet; then, annealing treatment is performed on the hot-rolled plate billet; finally, multi-pass alternating reversing cryogenic rolling is performed on the annealed plate billet, and the finished product titanium plate is obtained. The method adopts the electron beam cold hearth smelting technology to smelt the flat ingot for rolling in one time, reduces the process, greatly reduces the production cycle and cost; meanwhile, the reversing hot rolling, annealing treatment and alternating reversing cryogenic rolling process are combined, and the short-process preparation of the titanium plate with weak anisotropy and high strength and plasticity is realized.

This application discloses a dry-process electrode film and its preparation method, as well as an electrode and a battery, belonging to the field of battery technology. The method includes: mixing and pulverizing polytetrafluoroethylene, an active material, and a conductive agent to obtain a pulverized mixture; subjecting the pulverized mixture to a first-stage airflow milling and shearing process to obtain a milled and sheared mixture; the first-stage shearing conditions include: airflow temperature of -10 to 10°C, airflow pressure of 0.7 to 0.9 MPa, and rotation speed of 8000 to 12000 rpm; subjecting the milled and sheared mixture to a second-stage airflow milling and shearing process to obtain a fibrous material; and subjecting the fibrous material to a second-stage fibrosis treatment to obtain a dry-process electrode film. This method can significantly improve the tensile strength of the electrode film, increase the electrode liquid absorption rate, and reduce the electrode resistivity.

A method for preparing a coarse-grained ring-free 6061 aluminum alloy rod belongs to the technical field of aluminum alloy processing and manufacturing. It solves the problem of coarse-grained ring in the production of existing 6061 aluminum alloy rods, which causes uneven mechanical properties, poor fatigue resistance and anodic oxidation appearance defects. The method comprises the following steps: precise alloy component adjustment, low-temperature casting of round ingots, homogenization annealing, temperature-controlled low-speed hot extrusion forming with a round arc working belt mold, high-temperature online quenching, tensile straightening and low-temperature artificial aging. The present application effectively inhibits the abnormal recrystallization and growth of surface grains during the extrusion process, completely eliminates the coarse-grained ring defects of the rod section, and the obtained product has uniform and fine grain structure, stable and excellent mechanical properties, the tensile strength is not less than 310 MPa, the yield strength is not less than 270 MPa, and the elongation after fracture is not less than 12%. The product is suitable for automobile structural parts, rail transit accessories, high-end mechanical equipment and other material scenes, the process is suitable for industrialized batch production, and the production stability is strong and the application range is wide.

This invention discloses a near-net-shape forming mold and forming method for complex thin-walled magnesium alloy components with multiple inner ring ribs. The mold includes an upper mold and a lower mold. A punch pad is provided at the bottom of the upper mold, and a punch sleeve is provided at the bottom of the punch pad. The side of the punch sleeve is detachably connected to the upper mold via screw C. A lower pad is provided at the top of the lower mold, and an ejector rod is inserted inside the lower mold. A die pad block is provided at the top of the lower pad. The forming method includes the following steps: magnesium alloy ingot preparation, double-stage homogenization treatment, extrusion billet preparation, homogenized casting for large plastic deformation to obtain a hollow deformed billet with fine and uniform microstructure, and near-net-shape forming of the thin-walled component with multiple inner ring ribs. This invention can achieve one-pass integrated forming of thin-walled cabin components with complex structures such as multiple inner ring ribs and internal bosses. The prepared magnesium alloy cabin components have stable performance and low anisotropy.

A high-temperature material with high toughness and a preparation method thereof, relate to the field of metal precision casting, and aim to solve the problem of poor room temperature toughness of existing Nb-Si alloy materials.The expression of the material is Nb-16Si-20Zr-2C-xW, and the method comprises the following steps: firstly, weighing raw materials Nb, Si, Zr, C and W; secondly, pre-treating the surface of the raw materials, melting, and obtaining a cast alloy ingot; thirdly, placing the ingot in a non-consumable vacuum arc furnace with an ultrasonic device to perform ultrasonic-assisted melting, and obtaining an ultrasonic-state alloy ingot; fourthly, filling quartz sand, heat treating, and cooling to obtain a heat-treated alloy; and fifthly, polishing the surface of the heat-treated alloy to remove the oxide skin, and the preparation is completed.The present application combines ultrasonic-assisted solidification with heat treatment, and significantly improves the toughness of the alloy material.The present application is used for preparing a high-toughness alloy material.