70results about How to "Reduce anisotropy" patented technology

The invention belongs to the technical field of soft magnetic materials, and discloses an amorphous nanocrystalline soft magnetic material with high saturation flux density and a preparation method thereof. The preparation method comprises the following steps that an iron-based amorphous strip is crushed into flat powder with the thickness being 5-25 microns and the diameter being 30-80 microns, and scaly amorphous soft magnetic powder is obtained; the method comprises the following steps: performing insulation coating treatment on spherical iron-silicon soft magnetic powder with the average particle size of 2-20 microns to obtain insulation coating modified spherical magnetic powder; and mixing the obtained scaly amorphous soft magnetic powder, the insulating coated modified spherical magnetic powder and bonding resin, performing compression molding, performing annealing crystallization treatment at the temperature of 450-550 DEG C, and then raising the temperature to 600-900 DEG C for sintering treatment to obtain a finished product. According to the amorphous nanocrystalline soft magnetic material and the preparation method thereof, the spherical iron-silicon soft magnetic powder modified through insulation coating is compounded with the scaly amorphous soft magnetic powder, and low loss is maintained while the obtained amorphous nanocrystalline soft magnetic material Bs is remarkably improved.

The invention discloses a preparation method of a high-uniformity titanium alloy bar, which comprises the following steps of: performing reversing upsetting and drawing on a round billet or a near-round billet, controlling the rotation times of drawing in the reversing upsetting and drawing, performing spheroidization in combination with dynamic recrystallization, and returning to the original temperature after forging to enable an alpha phase to be further subjected to static recrystallization, thereby obtaining the high-uniformity titanium alloy bar. Meanwhile, the beta phase is recovered to form a subcrystal structure, and the beta phase and the alpha phase are further subjected to static recrystallization to be refined by heating to T beta-(10-30) DEG C. The problems of cracking and non-uniform deformation caused by reversing upsetting in the prior art can be remarkably improved, and the cracking degree of the blank is remarkably relieved while the structure uniformity is improved.

The invention discloses a method for rolling a TA21 titanium alloy sheet. The method comprises the following steps: 1, coating the surface of a TA21 titanium alloy plate blank with an anti-oxidation coating; 2, rolling for the first heating number; 3, cutting treatment; 4, rolling for the second heating number; and 5, cutting. 6, quenching treatment; 7, rolling for the third heating number; 8, cutting treatment; 9, annealing the semi-finished product; 10, cold rolling; and 11, annealing a finished product. According to the method, first two-heating-number rolling is carried out in a two-phase region, coarse beta grains are formed in combination with quenching and heat preservation, a long-strip-shaped alpha phase is separated out from a coarse beta phase through rapid water cooling to form a needle-shaped widmannstatten structure, then one-heating-number reversing large-deformation rolling and cold rolling are carried out in the two-phase region, a large number of structures are crushed and refined, the needle-shaped widmannstatten structure is spheroidized, and the needle-shaped widmannstatten structure is obtained. The TA21 titanium alloy thin plate with fine and uniform tissue is obtained, the plate blank is fully utilized, and the production efficiency is greatly improved.

The invention provides a production method of an invar alloy 4J36 hot-rolled coil, belongs to the technical field of invar alloy 4J36 hot rolling, and solves the problem that the invar alloy 4J36 hot-rolled coil needs to be efficiently produced. The plate blank is preheated and then heated after being ground, and the heated plate blank is subjected to high-pressure water descaling; and the descaled plate blank is rolled into an intermediate blank through seven-pass rough rolling, the intermediate blank is rolled into a black coil through five-pass steckel mill finish rolling, and the black coil is rolled into an invar alloy 4J36 hot-rolled black coil finished product. The method comprises the steps of slab component control, slab preheating and heating, rough rolling to obtain an intermediate slab, steekle mill rolling, coiling and the like, and surface oxidation generated in the heating process is reduced by adjusting the heating process; and through rolling of the steekle mill, dynamic recrystallization is fully carried out, the surface quality of the produced invar alloy 4J36 hot-rolled coil meets the product requirement, and the yield and the production efficiency are both remarkably improved.

The invention discloses a gallium oxide Schottky diode with a passivated two-dimensional semimetal insertion layer and a preparation method thereof, and the gallium oxide Schottky diode comprises a substrate which is made of N-type heavily doped beta-Ga2O3 with different crystal orientations; the epitaxial layer is located on the substrate; wherein the material of the epitaxial layer is N-type unintentionally doped beta-Ga2O3; the two-dimensional semimetal growth insertion layer is located on the epitaxial layer; the protection layer is located on the two-dimensional semimetal growth insertion layer, and the orthographic projection of the protection layer and the orthographic projection of the two-dimensional semimetal growth insertion layer are overlapped in the direction perpendicular to the substrate; the terminal structure is located on the epitaxial layer, the terminal structure is of an annular structure, and the terminal structure is arranged around the two-dimensional semimetal growth insertion layer and the protection layer; the anode covers the protective layer and a part of the terminal structure; and the cathode is positioned on one side, deviating from the epitaxial layer, of the substrate. According to the beta-Ga2O3-based SBD device provided by the invention, the two-dimensional material can adjust the energy band of the Ga2O3 surface by virtue of the inherent Van der Waals surface, and endow the Schottky barrier with extremely strong flexibility.

The invention belongs to the technical field of 3-series aluminum alloys, and particularly relates to a 3xxx aluminum alloy and a preparation method and application thereof. By optimizing the content of Mn, Fe and other elements and combining the high-temperature homogenizing annealing process, the aluminum alloy material has high strength and machinability, meanwhile, the size of coarse intermetallic compounds is reduced through high-temperature rolling, distribution is more uniform, grains and textures are refined through the continuous intermediate annealing process, and the yield of the aluminum alloy material is improved. The alloy plasticity is improved, the anisotropy of the plate is reduced, and the battery shell yield is higher. Moreover, high-temperature homogenization and hot continuous rolling are integrated, so that the production time is shortened, and the production efficiency is improved. According to the method, a high-temperature short-time intermediate annealing process is adopted, the grain size in the 3xxx aluminum alloy plate strip is regulated and controlled to be 25-35 microns, the texture proportion of Cube is 2-3.5%, and the texture proportion of Goss is 3-5%, the alloy plasticity is improved, the anisotropy of the plate is reduced, and the surface quality of a battery shell can be effectively improved.

The invention discloses a 6-series high-strength aluminum alloy plate for an automobile and a preparation method of the 6-series high-strength aluminum alloy plate, and belongs to the technical field of aluminum alloy preparation. The plate comprises the following metal element components in percentage by mass: 0.7%-1.0% of Si, 0.2%-0.3% of Fe, 0.5%-0.9% of Cu, 0.15%-0.3% of Mn, 0.6%-1.0% of Mg, 0.15%-0.25% of Cr, 0.05%-0.1% of Zn, more than or equal to 0.2% and less than or equal to 0.35% of Cr and Zn, and the balance of Al and inevitable impurities. The preparation method comprises the following steps: smelting and casting according to alloy components and proportions to obtain a cast ingot, homogenizing, carrying out hot rolling and coiling, cooling, carrying out cold rolling and coiling, carrying out solid solution treatment, carrying out pre-aging treatment, and detecting whether the mechanical property meets the requirements or not. By adding the Cr and Zn elements and controlling the adding amount of the Cr and Zn elements, the obtained aluminum alloy plate is high in strength, good in plasticity and low in anisotropy.

The invention relates to a production method for reducing the anisotropy of the r value of a 439 cold-rolled plate material. The production process comprises smelting, casting, billet heating, hot rolling, hot rolling annealing, hot rolling pickling, cold rolling, cold rolling annealing, and cold rolling pickling; the annealing temperature of the hot rolling annealing is ≤900°C, and the annealing time is 1-4 minutes; the annealing temperature of the cold rolling annealing is 950-1030°C, and the annealing time is 1-4 minutes; the r value of the produced 439 cold-rolled plate steel strip in the 45° direction is increased by about 50% (increased from 1.1 to more than 1.6), and the Δr values ​​in the three directions of 0°, 45° and 90° are within 0.3, so that the anisotropy of the material is effectively reduced, the problem of cracking along the 45° direction during the material stamping process is improved, and the deep drawing forming performance of the material is improved.

The invention discloses an additive spinning composite forming device and method for a thin-wall rotary body part. The additive spinning composite forming device comprises a lifting platform, a rotating platform is installed on the lifting platform, a claw-shaped clamp is connected to the rotating platform, an additive base body is clamped by the claw-shaped clamp, and the thin-wall rotary body part is arranged on the additive base body; the thin-wall rotary body part is located between the two spinning mechanisms and the laser cladding head, the spinning mechanisms and the laser cladding head are connected to the clamping mechanism, the clamping mechanism is connected to one end of the mechanical arm, and the other end of the mechanical arm is connected to the mechanical arm base body; additive manufacturing of the thin-wall rotary body part and spinning of the additive deposition layer are synchronously achieved, material grain refinement and rearrangement are promoted through spinning of the deposition layer, the microstructure is improved, and the part performance is improved; and meanwhile, pores possibly generated in the additive manufacturing process are effectively eliminated through spinning, the compactness of the part is improved, and therefore the microstructure and the mechanical property of the thin-wall rotary body part manufactured through additive manufacturing are comprehensively improved.

The invention discloses a heat treatment method for improving the structure uniformity of an additive-state GH4169 alloy, and belongs to the technical field of heat treatment processes. The method comprises the following steps: carrying out pre-aging treatment on the additive-state GH4169 alloy, and carrying out air cooling to room temperature; then carrying out homogenization treatment, and carrying out water cooling to room temperature; and finally, two-stage aging treatment is conducted, and air cooling is conducted to the room temperature. According to the method, the delta phase is precipitated at the grain boundary in a saturated mode through pre-aging treatment, and grain growth in the follow-up homogenization process is effectively limited through pinning of the grain boundary; the precipitation uniformity of a gamma'phase and a gamma ''phase in subsequent two-stage aging treatment is improved through homogenization treatment, recrystallization can be promoted, the grain structure can be transformed, the texture strength can be reduced, the grain structure uniformity can be improved, and the mechanical property of the additive-state GH4169 alloy can be improved; two-stage aging treatment is adopted, so that a gamma'phase and a gamma ''phase which are uniformly distributed are separated out from the additive-state GH4169 alloy, the effect of aging strengthening is achieved, and the yield strength, the tensile strength, the ductility and other mechanical properties of the additive-state GH4169 alloy are improved.

The invention discloses a blank making method for improving the texture uniformity of a TC18 titanium alloy thick plate type forge piece. The blank making method comprises the steps that firstly, Z-X-Y three-direction forging is conducted on an original bar; drawing out the blank subjected to three-direction forging in the X direction and the Y direction; and then the drawn blank is flattened and shaped in the X direction, the Y direction and the X direction in sequence. According to the method, Z-direction deformation is increased by adopting three-direction forging during blank manufacturing through a method of increasing the height deformation of the bar, so that the forge piece deforms in three directions in the blank manufacturing process, the difference of the deformation in the three directions of the blank in the blank manufacturing process is reduced, strong orientation texture segregation caused by the difference of the three-direction deformation is weakened, and the mechanical property of the forge piece has anisotropy; and the material is uniformly deformed in three directions, the effect of weakening the beta-phase texture is achieved, the requirement for improving the texture uniformity of the forge piece is met, and the mechanical property of the material is improved.

The invention provides a high-formability 6-series aluminum alloy pedestrian protection automobile sheet and a preparation method thereof, and belongs to the technical field of aluminum alloy preparation. The 6-series aluminum alloy pedestrian protection automobile sheet comprises the following components in percentage by mass: 0.40-0.75% of Si, 0.20-0.30% of Fe, 0.10-0.20% of Mn, 0.25-0.50% of Mg, less than or equal to 0.1% of Cu, less than or equal to 0.05% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti, less than or equal to 0.15% of other impurities and the balance of Al, preferably, 0.55-0.65% of Si, 0.20-0.30% of Fe, 0.15-0.20% of Mn, 0.30-0.40% of Mg, less than or equal to 0.1% of Cu, less than or equal to 0.05% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.03% of Ti, less than or equal to 0.15% of other impurities and the By controlling the element content of the alloy and optimizing the hot rolling coiling temperature, the cold rolling machining rate and the solid solution and pre-aging treatment process parameters, the 6-series aluminum alloy pedestrian protection automobile sheet with low yield strength, high elongation, high formability and low anisotropy can be obtained.

The invention provides a high-strength aluminum alloy friction stir welding seam defect repairing method and system. The method comprises the steps that a to-be-repaired area is marked; calculating filling passes and the number of layers, planning a multi-layer and multi-channel filling path of the cross interface effect, and storing the multi-layer and multi-channel filling path in a three-dimensional model readable by equipment; determining repair manufacturing process parameters; importing a data model containing the contour of the to-be-repaired area, the number of filling layers and the filling pass of each layer into model processing software in a file format, and processing the repair model according to the repair manufacturing process parameters to obtain a filling repair path of the to-be-repaired part; and the repaired high-strength aluminum alloy component is prepared according to the repair manufacturing process parameters and the planned path in cooperation with a tool of additive repair equipment. On one hand, the problems that the high-strength aluminum alloy material shortage repairing filler is too high in heat input, large in influence on the performance of a base material and limited in performance improvement are solved, and on the other hand, the anisotropy between the performance of a filling area and the performance of the base body is effectively weakened.

The invention relates to the technical field of thermoplastic material foaming, in particular to a preparation method of an ultralight foaming material with micropore channels. The invention relates to an ultralight foaming material with micropore channels. The ultralight foaming material comprises the following substances in parts by weight: 80-90 parts of thermoplastic matrix resin; 0.1 to 2 parts of a pore-foaming agent; 0.1 to 0.8 part of a functional auxiliary agent; 10 to 20 parts of auxiliary materials; the pore-foaming agent comprises one or a mixture of more of activated carbon, zeolite, porous ceramic and hollow glass microspheres. According to the technical scheme, the thermoplastic matrix resin is selected to be combined with the pore-forming agent, the composite material formed after foaming treatment has a good vacuum channel structure, the density of the material is effectively reduced, the porosity of the material is improved, on the basis, selection of the pore-forming agent is optimized, and the porosity of the material is improved. The prepared ultralight foaming material has different pore structures and adsorption performance, and more excellent material performance can be obtained through mixed use.

The invention relates to a method for inhibiting anisotropy of a metal powder bed melt-formed superalloy through powder pretreatment, which comprises the following specific steps: taking a proper amount of nickel-based superalloy powder, and carrying out vacuum sheathing treatment; s2, after the nickel-based high-temperature alloy powder in the step S1 is subjected to vacuum sheathing treatment, the nickel-based high-temperature alloy powder is subjected to heat treatment for a proper time at a proper temperature, and furnace cooling is carried out, so that a proper amount of endogenous nanoparticles are separated out; in this way, powder element distribution and dendritic crystal distribution of atomized powder are improved, and nano-particles are endogenously separated out. After heat treatment of the nickel-based superalloy powder in the step S2 is completed, proper printing parameters are selected, the powder is printed and formed through a metal powder bed fusion forming technology, and the nickel-based superalloy material with weakened anisotropy and excellent mechanical performance is obtained; and the nickel-based high-temperature alloy part obtained in the S3 is subjected to solution treatment, the anisotropy is further eliminated, and the performance is improved. Compared with an existing nickel-based composite material, the mechanical property of the prepared nickel-based high-temperature alloy material is obviously improved.

The invention discloses a silicon carbide ceramic material and a preparation method thereof, and relates to the technical field of ceramics. When the silicon carbide ceramic material is prepared, firstly, apricot shell carbon, nano silicon dioxide and sodium salt are mixed and calcined in a nitrogen atmosphere, and a modified silicon carbide composite nanowire is prepared; modifying the modified silicon carbide composite nanowire and praseodymium powder by a molten salt method to prepare a praseodymium modified silicon carbide composite nanowire; liquid polycarbosilane, the praseodymium modified silicon carbide composite nanowire, a modification additive, silicon carbide particles and a sintering additive are subjected to wet ball milling, mixing and curing, and then composite sintering powder is prepared; and sintering the composite sintered powder by a spark plasma sintering method, and then annealing in an argon atmosphere to prepare the silicon carbide ceramic material. The silicon carbide ceramic material prepared by the invention has the advantages of high thermal conductivity, electromagnetic shielding, high strength and high compactness.

The invention discloses a method for preparing an Al-Zn-Mg-Cu aluminum alloy free forging, which comprises sequentially subjecting an Al-Zn-Mg-Cu aluminum alloy ingot after homogenization to variable temperature forging, solution treatment, cryogenic treatment, cold compression treatment and aging treatment. The method can improve the differences in the transverse, longitudinal and high-direction properties of high-strength aluminum alloy free forgings by introducing variable temperature forging technology and combining cryogenic treatment during the forging process, and has the advantages of simple operation and wide applicability.

The invention discloses a magnesium alloy plate corrugated lining plate rolling method based on micro-grain regulation and control, and belongs to the technical field of plate rolling forming. The invention aims to solve the problems of high anisotropy, poor calendaring formability and the like of an alloy plate due to strong basal texture of the alloy plate due to formation of corresponding stress on the alloy plate surface and over-small range of a rubbing and rolling area during traditional magnesium alloy rolling. According to the rolling method additionally provided with the corrugated lining plate, the deformation resistance of external friction to the plate in the rolling process is reduced, the loading mode is converted into overall application from local application, and the grain size and distribution of the magnesium alloy plate are effectively controlled by regulating and controlling the diameter and period of the corrugated surface of the corrugated lining plate. And the stress state of the plate is changed, and non-uniform deformation and local dynamic recrystallization nucleation are promoted, so that grains are refined, the basal texture is weakened, and the quality and the overall performance of the rolled plate are greatly improved. The method is suitable for short-process rolling forming of the magnesium alloy plate.

The present invention belongs to the technical field of composite additive manufacturing of metal structural parts, and specifically relates to an interlayer ultrasonic impact-assisted high-performance CMT arc additive manufacturing method and device. The present invention realizes the regulation of stress and structure in the forming process of arc additive components through the alternating operation of a cold metal transition arc additive manufacturing control device and a harmonic ultrasonic impact control device, and the strengthening effect is more thorough. The present invention effectively eliminates the residual tensile stress on the interface and produces uniform plastic deformation by performing harmonic ultrasonic impact treatment on the interlayer bonding interface in the CMT arc additive manufacturing process, thereby regulating the size of the primary coarse columnar β crystals and improving the anisotropy of the mechanical properties of the components, so as to achieve the effect of reducing the grain size, eliminating metallurgical defects, and improving strength and plasticity in an integrated manner.

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 invention discloses a carbon brick for an Acheson graphitization furnace and a preparation method of the carbon brick, and belongs to the technical field of graphitization furnace production. The raw materials for preparing the effective components of the carbon brick comprise the following components in parts by weight: 38-50 parts of coal with the particle size of 0.15-3mm, 15-27 parts of coal with the particle size of less than 0.15 mm, 2-8 parts of boric oxide, 2-8 parts of carbon black and 15-30 parts of a binder. Compared with a granular resistance material, the carbon brick disclosed by the invention is more compact and uniform in structure, and more uniform and stable in provided heat; and the resistance performance and the structure are stable, the repeated utilization rate is high, and the production cost is greatly reduced. The method is suitable for the Acheson graphitization furnace to produce graphitized materials.

The invention relates to a forging method for improving impact toughness of H13 type round steel, which is characterized in that a special heating standard is used for heating, and a special forging mode of axial upsetting, radial large rolling reduction forging, square flattening, high-temperature diffusion, axial upsetting, radial large rolling reduction forging, square forming and octagonal forming and precision forging machine forming is adopted for forging. According to the process, after each axial upsetting, one-pass radial pressing, 90-degree overturning and one-pass radial pressing are carried out on a lower platform of an upper flat plate, the pressing amount each time is 45%-50% and is equivalent to the axial upsetting deformation amount, the core of the forge piece can be fully compacted, the forge piece grains are refined, the structure is homogenized, the anisotropy of the forge piece can be reduced, the transverse performance of the forge piece can be improved, and the yield of the forge piece is improved. According to the method, the blank drawn to be flat and square is subjected to high-temperature diffusion, sufficient heat preservation is conducted at 1250 + / -10 DEG C to 1280 + / -10 DEG C, the excellent effect is achieved, then grown grains are refined through sufficient deformation, and finally the unnotched impact toughness can reach the industry leading level.

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 invention discloses a rock mass structural surface three-dimensional shape duplicating method which comprises the following steps: collecting rock samples of different types of structural surfaces, cleaning and cutting the structural surfaces of the rock samples into planes, and scanning to obtain a three-dimensional digital model of the structural surfaces; calculating a roughness parameter R lambda based on a Lyapunov index and a roughness parameter RD based on a fractal dimension according to an apparent dip angle of a data point on the three-dimensional digital model; selecting the roughness parameter R lambda and the three-dimensional digital model corresponding to the roughness parameter RD in the plurality of rock samples meeting preset conditions as a three-dimensional duplicated structural surface, and importing the three-dimensional duplicated structural surface into a carving machine; selecting a feeding mode of the structural surface, and inputting the feeding mode into a carving machine; the engraving machine generates a three-dimensional engraving path of the structural surface according to the input three-dimensional digital model and the feeding mode; according to the three-dimensional engraving path, the engraving machine is adopted to re-engrave the selected structural surface on the splicing surface of the two rock sample blocks, and then the rock sample blocks are spliced to form the test sample with the three-dimensional re-engraved structural surface.

The present invention provides a high-pressure multi-atmosphere assisted SLM gradient material preparation method and aluminum-lithium alloy coating, comprising the following steps: injecting a first mixed gas into a working box; reacting the molten material in a micro-melting pool with a carbon-containing active gas by laser irradiation to form a carbide-doped first gradient aluminum-lithium alloy coating; injecting a second mixed gas into the working box; reacting the molten material in the micro-melting pool with a carbon-containing and nitrogen-containing active gas by laser irradiation to form a carbonitride-doped second gradient aluminum-lithium alloy coating; injecting a third mixed gas into the working box; reacting the molten material in the micro-melting pool with a nitrogen-containing active gas by laser irradiation to form a nitride-doped third gradient aluminum-lithium alloy coating. The present invention improves the surface forming quality of the aluminum-lithium alloy material while achieving the overall hard outer and tough inner properties of the material.

The application relates to a synergistic casting-rolling method for eliminating bright star defects in the dark surface of 8011 aluminum alloy single zero foil, and relates to the technical field of aluminum alloy casting-rolling processing. The method comprises the following steps: S1, melt refining: introducing aluminum alloy melt into a holding furnace for refining, and the refining time interval is 2.5-3.5 h / time; S2, casting-rolling cooling: adopting circulating cooling water to cool the casting-rolling roller, the water pressure is controlled to be 0.42-0.48 MPa, and the water temperature is controlled to be 35-40 DEG C; and S3, casting-rolling forming: sending the melt into the casting-rolling roller through a casting nozzle for casting-rolling, the thickness of the strip is controlled to be 6.3-6.6 mm, and the rolling strip speed is controlled to be 700-730 mm / min. Through multi-dimensional synergy of melt purity control, cooling strength improvement, blank thinning and strip speed reduction, the application refines the grains in the casting-rolling area, effectively inhibits the segregation and precipitation of coarse Al-Fe-Si brittle intermetallic compounds, eliminates the bright star defects in the dark surface of the foil caused by the crushing of brittle phases in the subsequent cold rolling ultra-thinning process, and significantly improves the surface quality and the yield of the single zero foil.