774 results about "Lamellar structure" patented technology

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength flame-retardant composite material for pipelines and a preparation method thereof. The high-strength flame-retardant composite material for the pipeline is prepared from the following components in parts by weight: 70 to 80 parts of PA12T, 10 to 15 parts of a toughening agent, 20 to 30 parts of fiber reinforced filler, 8 to 16 parts of melamine polyphosphate, 1 to 6 parts of attapulgite, 2 to 4 parts of graphene, 0 to 3 parts of a coupling agent, 0 to 3 parts of a lubricating agent and 0 to 3 parts of an antioxidant. MPP is an N and P double-element synergistic flame retardant, and the flame retardant effect is better. Through the adsorption effect of the attapulgite, the dispersing performance of the MPP in the PA12T can be improved, and the precipitation phenomenon of the MPP can be prevented. The graphene is used as a common flame-retardant carbon-forming agent, and the lamellar structure of the graphene can play a role in resisting molten drops; and moreover, the graphene and the attapulgite with a rodlike structure interact with each other, so that the dispersion performance of the graphene, the attapulgite and the melamine polyphosphate in the nylon resin is promoted.

The invention relates to the technical field of glass white board ink, and discloses high-gloss and high-covering ink for a glass white board and a preparation method thereof, the high-gloss and high-covering ink comprises the following raw materials by mass: 30-35 parts of pigment, 2-5 parts of composite diatomite, 8-10 parts of a dispersant, 3-7 parts of resin, 0.2-0.5 part of a wetting agent, 50-60 parts of deionized water, and 5-8 parts of propylene glycol. The nano titanium dioxide has high refractive index and light scattering performance, so that the ink can fully reflect light under illumination, and the nano titanium dioxide and the diatomite have a relatively good synergistic effect in the aspect of improving the glossiness of the ink; the lamellar structure of the graphene oxide can effectively cover the ground color of the glass white board, and a high covering effect is achieved; a hydrophilic chain segment of the amphiphilic block copolymer extends in an ink system, and a hydrophobic chain interacts with the lipophilic pigment, so that the stability and the covering effect of the ink are improved.

The invention discloses a hydrogel scaffold with multiple physical gradients. The hydrogel scaffold is prepared from the following synthetic raw materials: thermo-sensitive polyisocyanide polypeptide, silk nanofibers rich in beta lamellar structures and a conductive nanomaterial. The conductive nano material dispersion liquid and the BSNF solution are uniformly mixed according to a ratio of 1: 4; at 4 DEG C, adding a BSNF-loaded conductive nano material mixture into a PIC aqueous solution, uniformly mixing, adding into a square tank with an electrode, and applying a direct-current electric field to the hydrogel; after the electric field is removed, the temperature is raised to 25 DEG C, PIC is induced to form gel, and the conductive hydrogel stent with multiple physical gradients is obtained. The hydrogel contains multiple physical gradient structures such as rigidity, conductivity and morphology. The multi-gradient hydrogel with different patterns can be constructed by regulating and controlling the shape, the position and the electric field applying time of the electrode; the preparation method disclosed by the invention is simple, convenient to operate, simple in equipment and process requirements, low in cost and capable of realizing large-scale industrial production.

The present invention discloses a rubber sealing strip and a preparation method thereof, and relates to the technical field of sealing strip production, the rubber sealing strip comprises the following raw materials: base rubber, modified montmorillonite, modified carbon black, a plasticizer, a vulcanizing agent, an anti-aging agent and other assistants, the modified montmorillonite is subjected to oleic acid modification, and tetraethoxysilane is subjected to hydrolysis and condensation reaction to obtain the rubber sealing strip. A silicon dioxide coating layer can be formed on the surface of the carbon black, and the lamellar structure of the oleic acid modified montmorillonite and the silicon dioxide modified carbon black can be interwoven to form a more complex and compact physical barrier network, so that the processability of the rubber sealing strip is greatly improved.

The invention discloses a TC4 titanium alloy preformed blank, a TC4 titanium alloy plate with a full lamellar structure and a preparation method of the TC4 titanium alloy plate, and belongs to the technical field of titanium alloy machining. According to the method, TC4 alloy powder prepared through hydrogenation dehydrogenation and plasma rotating electrode atomization serves as a raw material, and a high-density binary structure preformed blank is prepared through a three-step type hot isostatic pressing technology; a pure titanium sheath is adopted for packaging, two-heating-number rolling is conducted through the sheath, and the plate shape is optimized through convexity design of a working roller and dynamic roller bending force control; and after rolling, solid solution and two-stage aging composite heat treatment are combined, the head and the tail are cut off, and the TC4 titanium alloy plate is obtained. The problem of tissue segregation of a traditional cast ingot is solved through powder metallurgy, the obdurability is improved, and the anisotropy is reduced; and meanwhile, the raw material cost is reduced, the production period is shortened, the yield is increased, the surface quality is improved, and a reliable scheme is provided for green and efficient preparation of high-performance titanium alloy plates in the aerospace field.

The invention discloses high-transparency explosion-proof glass and a preparation process thereof, and the preparation process comprises the following steps: uniformly mixing a glass substrate and Al2O3 nanoparticles in proportion, and heating until a molten state to obtain a liquid glass matrix; the method comprises the following steps: introducing a liquid glass matrix into a forming mold, and pre-cooling the liquid glass matrix to enable the liquid glass matrix to be in a semi-solid state; the method comprises the following steps: applying directional stress to a semi-solid glass substrate, and cooling the semi-solid glass substrate to obtain a compression layer, so that the glass is of a hard-soft-hard layered structure; directional stress is applied to the semi-solid glass substrate, so that Al2O3 nanoparticles are uniformly enriched on two surfaces of the glass substrate and are quickly cooled, a compression layer is formed on the surface of the glass, and a relatively small tensile stress layer is formed inside the glass, so that the glass is of a hard-soft-hard layered structure, external force impact can be effectively absorbed and dispersed, and the service life of the glass is prolonged. Stress concentration and crack propagation are avoided, the internal structure of the glass is protected, and the anti-explosion performance and durability of the glass are improved.

The invention discloses a layered structure metal composite material based on a liquid phase separation phenomenon and a preparation method thereof, and the preparation method comprises the following steps: step 1, weighing raw materials which comprise at least two kinds of metal which is difficult to mix and melt; 2, the temperature of the metal material in the step 1 is increased to be above the liquidus of the metal material, and a mixture with uniform components is obtained; (3) cooling the mixture smelted in the step (2) to a liquid-phase non-mixed-melting temperature interval until the mixture is completely separated; and 4, the required metal composite material with the layered structure can be obtained after cooling. According to the invention, a method of continuous liquid phase separation and melt solidification along with a furnace is adopted, and the preparation of the layered composite material is realized by regulating and controlling alloy elements and process parameters; the preparation method is easy to operate, low in cost and high in efficiency, a metallurgical bonding interface can be obtained, and the problem that the bonding strength of a dissimilar material composite interface is low is solved.

The invention discloses a honeycomb ceramic and a preparation method thereof.A composite additive is added into a mixed ceramic raw material, the weight ratio of the mixed ceramic raw material to the composite additive is (30-50): (50-70), and the composite additive comprises 30-54 parts of flaky aluminum oxide, 2-10 parts of nano zinc oxide and 1-5 parts of metal molybdenum particles; the preparation method comprises the steps of ball milling, kneading, refining, extrusion forming, drying and sintering. According to the invention, the raw material formula is optimized, and bauxite is replaced by flaky alumina; beneficial additives, namely nano zinc oxide and metal molybdenum particles, are doped; an original extrusion molding device is used for achieving a layered structure of flaky aluminum oxide, and therefore the shell-imitating pearl layer structure with the layered aluminum oxide as bricks, the metal molybdenum particles as mud and the zinc-aluminum spinel particles as protrusions is built.

The invention relates to the technical field of composite materials, in particular to a high-strength epoxy resin composite material and a preparation method thereof, and the high-strength epoxy resin composite material comprises the following raw materials in parts by weight: 50-80 parts of a base material, 10-20 parts of a curing agent, 5-10 parts of modified carbon nanotubes, 3-10 parts of a reinforcing sheet, 3-6 parts of a reinforcing material and 1-3 parts of a flame retardant. In the preparation method, the modified carbon nanotubes are in chemical bond connection with the base material through surface modification, the interface bonding force is enhanced, stress is effectively transmitted, the unique layered structure and surface modification treatment of the enhanced sheet are enhanced, the enhanced sheet is firmly combined with the resin matrix, and a three-dimensional enhanced network is formed through the synergistic effect of mechanical interlocking and stress dispersion. The vermiculite sheet layer prevents crack propagation, and the modified carbon nanotubes and the reinforcing material effectively transfer stress, so that the tensile strength and bending strength of the composite material are greatly improved, and the high-strength application requirement is met.

The invention discloses a nanocrystal magnetic material and a preparation method thereof, the nanocrystal magnetic material is a magnetic Nb3VSe6 crystal and comprises three elements, namely Nb, V and Se, the metered molar ratio of the three elements is 3: 1: 6, the crystal has a centrosymmetric broken hexagonal layered structure, the space group of the crystal is P6322, V atoms are inserted between two 2H-NbS2 hexagonal layers, the lattice constants a = b = 5.738, and c = 12.018. The magnetism in the material is mainly contributed by positive trivalent Cr ions, the magnetic moment is 3B, the local electron spin S is equal to 3 / 2, and conduction electrons are from unfilled bands of Nb atoms. Due to the unique crystal structure and electronic property, the material shows potential application value in multiple fields, especially in the aspects of high-frequency devices, spintronics elements, magnetic dampers and the like. The Nb3VSe6 single crystal is relatively stable in air, which is a great advantage for practical application.

Described are electrodes for use in lithium-ion and lithium metal electrochemical cells, lithium-ion and lithium metal electrochemical cells, and methods of making the electrodes using a bidirectional freeze-casting process. The electrodes described herein include vertical lamellar structures that provide beneficial performance characteristics to the electrochemical cells incorporating the electrodes. The electrodes can be prepared using a slurry that includes a conductive additive, particles of active material, a binder, and a solvent, such as water. The bidirectional freeze-casting process can freeze the slurry to form the vertical lamellar structures as an active material layer on a surface of a current collector. The vertical lamellar structures can define interlamellar channels that facilitate decoupling of lithium-ion transport in interlamellar and intralamellar regions of the electrodes, thereby providing beneficial areal capacity and rate capability performance.

The invention relates to the technical field of neodymium-iron-boron magnetic materials, in particular to a preparation method of a large-size high-performance sintered neodymium-iron-boron magnet. According to the method, a blank of a layered structure is prepared by stacking magnetic powder with different components in a profiling stage, first grain boundary diffusion is accompanied in the sintering process, and then the large-size high-performance sintered neodymium-iron-boron magnet is prepared through traditional grain boundary diffusion (second time). The first grain boundary diffusion involved in the method is generated in the liquid phase sintering densification process, and concentration gradient diffusion is carried out along the grain boundary after a diffusion source is liquefied; and the second grain boundary diffusion is the concentration gradient diffusion of the heavy rare earth on the surface of the compact magnet towards the interior of the magnet. In a large-size magnet, the layered structure design is matched with the twice grain boundary diffusion technology, and the defect of insufficient depth in the traditional grain boundary diffusion technology can be overcome.

The invention relates to the technical field of ultraviolet shielding materials, in particular to a preparation method of an MXene / lignin two-dimensional nanosheet composite material and application of the MXene / lignin two-dimensional nanosheet composite material in ultraviolet shielding. The preparation method comprises the following steps: performing vacuum freeze drying on a lignin deionized water dispersion liquid to obtain flake lignin, dissolving Ti3AlC2MAX powder into a lithium fluoride and concentrated hydrochloric acid solution to obtain etched MXene, dispersing the etched MXene and the flake lignin into an ammonia water solution, mixing, and performing ball milling to obtain a modified MXene solution; and separating solids from the obtained suspension, washing to be neutral, and freeze-drying to obtain the MXene / lignin composite nanosheet composite material. The lignin nanosheets are intercalated in the lamellar structure of MXene, on one hand, the agglomeration phenomenon among the lignin nanosheets is avoided, and on the other hand, the phenomenon that part of MXene is not stripped and layered is solved, so that the MXene forms a uniform nanosheet structure, and the whole MXene shows good ultraviolet shielding capability and oxidation resistance.

The invention relates to the technical field of wave-absorbing materials, and particularly discloses a Zn-Fe-Mn oxide-hard carbon composite material and a preparation method and application thereof. The preparation method comprises the following steps: preparing pomegranate-shaped spheres through a coprecipitation-calcination method; then, uniformly dispersing the mixture in a self-made solvent composition, and curing and molding the mixture through heating treatment; and finally, carrying out annealing treatment in a high-temperature tube furnace at the temperature of 800 DEG C in an argon protective atmosphere (the flow rate is 100 sccm), so as to prepare the Zn-Fe-Mn oxide-hard carbon composite material. The composite material has a unique three-dimensional layered structure, shows excellent broadband microwave absorption characteristics, and can realize efficient electromagnetic wave attenuation. And a new way is opened up for structural design and optimization of the high-performance wave-absorbing material, and the wave-absorbing material has a wide application prospect in the application fields of advanced stealth technology and novel electromagnetic shielding.

The invention discloses a lithium manganese iron phosphate composite material and a preparation method and application thereof, and belongs to the technical field of lithium batteries, the lithium manganese iron phosphate composite material comprises the following raw materials: a lithium source, a manganese source, an iron source, phytic acid, graphene oxide, polyvinyl alcohol, pyrrole and a dopant; hydroxyl on the surface of graphene oxide and phytic acid are subjected to a phosphate esterification reaction through a hydrothermal method, a mixed solution a is obtained, a mixed solution b containing polyvinyl alcohol phytate is obtained in a similar way, a manganese source, a lithium source and an iron source are combined, a semi-finished product is prepared through roasting, and then the surface of the semi-finished product is coated with a doped polypyrrole layer. The three-dimensional structure is a composite structure of a rod-shaped structure and a lamellar structure, and compared with a lithium manganese iron phosphate material with a single morphology in the prior art, the lithium manganese iron phosphate composite material with the three-dimensional structure has the advantages that the specific surface area is obviously increased, the stability is higher, and the contact area with electrolyte is larger; and the diffusion efficiency of lithium ions and the charge-discharge performance of the battery are improved.

The invention discloses a regulation and control method for a TiAl alloy double-peak lamellar structure, and belongs to the technical field of TiAl alloy heat treatment. A TiAl alloy sample is firstly subjected to heat treatment to prepare a conventional lamellar structure composed of coarse gamma lamellas, then the conventional lamellar structure is heated to 5-50 DEG C below a T alpha / (alpha + gamma) or T (alpha + beta) / (alpha + beta + gamma) phase transformation point, heat preservation is conducted for 5-120 min, rapid cooling is conducted, and a metastable lamellar structure containing a small amount of gamma coarse lamellas is obtained; and finally, low-temperature tempering treatment is conducted, heat preservation is conducted for 5 min to 300 min at the temperature of 700 DEG C to 1000 DEG C, furnace cooling is conducted to the room temperature, and the TiAl alloy with the double-peak lamellar structure is obtained. Through the regulation and control method, the formation of a discontinuous precipitation zone and a non-equilibrium structure is effectively inhibited while the gamma lamellas of the TiAl alloy are refined, and compared with a conventional lamellar structure composed of coarse gamma lamellas, the yield strength of the TiAl alloy can be improved by at least 50 MPa through the prepared double-peak lamellar structure, and the steady-state creep rate of the alloy is reduced by more than 5 times.

The invention relates to the field of preparation of lubricating materials, in particular to a preparation method of composite phase change lubricating gel based on temperature-friction force synergistic response. The lubricating gel adopts a sandwich layered structure; the bottom layer is a porous ceramic layer formed by micro-arc oxidation, is filled with a disulfide bond dynamic network polymer and is anchored on a metal substrate; the middle layer comprises a microencapsulated phase change material which is dispersed in a polyurethane network containing dynamic disulfide bonds and is wetted with ionic liquid; the surface layer is an epoxy resin coating rich in boron nitride nanosheets, and a rapid heat conduction channel is constructed. Compared with the prior art, the lubricating state can be automatically adjusted in the friction process without external energy input, and the method has the advantages of being sensitive in multi-field coupling response, capable of achieving automatic antifriction protection, high in extreme working condition adaptability and the like.

The invention relates to the technical field of layered products, and particularly discloses a skin material for wave-absorbing hiding and a preparation method. The skin material is of a layered structure and comprises a bionic micro-forest wave-transparent layer, a gradient transition layer, a wave-absorbing layer with a'skeleton-matrix 'dual-network structure, a reflecting layer and a heat-insulating layer which are sequentially arranged from top to bottom. A micro-cone array is arranged on the surface of the bionic micro-forest wave-transparent layer, so that broadband impedance matching is realized; the wave-absorbing layer comprises a three-dimensional ceramic skeleton and a magnetic-dielectric composite matrix filled in pores of the skeleton, and magnetic absorbents in the wave-absorbing layer are directionally arranged in the layer plane direction through a magnetic field auxiliary technology. The skin material prepared by the invention has excellent comprehensive performance of ultra-wideband wave absorption, high mechanical strength, light weight and high temperature resistance, and is particularly suitable for stealth requirements in the field of aerospace.

The present invention belongs to the field of welding engineering in the railway locomotive and rolling stock industry, and discloses a method for welding composite plates. The method comprises: S1: welding a carbon steel base layer and a stainless steel cladding layer into an integrated layered composite plate; S2: performing groove processing on the welding surface of one integrated layered composite plate, and providing a blunt edge on the carbon steel base layer side of the composite plate; symmetrically processing another integrated layered composite plate, so that the grooves of the two composite plates form a V-shaped groove after being paired; S3: mechanically cleaning and drying the composite plate processed in step S2; S4: pairing the grooves; S5: welding the carbon steel base layer; S6: welding the stainless steel cladding layer. In view of the characteristics of the ultra-thin cladding layer of the TE4003C5 composite plate, the present invention provides a method comprising performing groove processing on the welding surface of the composite plate and welding after pairing, thereby improving the welding quality and efficiency of the TE4003C5 composite steel plate.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength bismaleimide resin material and a preparation method thereof. The bismaleimide resin composition comprises the following components in parts by weight: 50-60 parts of bismaleimide resin, 40-50 parts of an allyl compound, 1-3 parts of modified graphene and 0.1-0.5 part of a dispersing filler, the dispersing filler is prepared from modified inorganic nanoparticles and modified tetrapod-like zinc oxide whiskers in a mass ratio of (0.1-1): 1. Wherein the tetrapod-like zinc oxide whiskers can promote the dispersion of the graphene with a large lamellar structure from the macroscopic aspect, so that the graphene is uniformly dispersed in a bismaleimide resin matrix, and the inorganic nanoparticles can play a role in lubrication and isolation, so that the agglomeration among graphene lamellas in a small range is prevented. By adding the graphene composite reinforcing filler, the rigidity of the bismaleimide resin material is improved, and the toughness of the composite material can be improved at the same time.

The invention belongs to the field of thermal insulation materials, and relates to design of a micro-nano structure of a material and an assembly strategy of a micro-nano structure unit, in particular to a preparation method of a zirconium oxide-based thermal insulation film with light weight, high strength and low heat conductivity coefficient. The preparation method comprises the following steps: growing zirconium oxide on the surface of a graphene oxide nanosheet serving as a template, and finally, efficiently assembling the graphene oxide nanosheet through vacuum filtration to obtain the zirconium oxide-based composite film with a layered structure. The specific method comprises the following steps: (1) mixing graphene oxide with zirconium salt to prepare a graphene oxide-zirconium oxide nanosheet structure unit; (2) preparing an organic matter binder solution; and (3) mixing the nanosheets in the step (1) with the solution in the step (2), and performing vacuum filtration to obtain a composite film, thereby finally realizing the preparation of the light high-strength zirconium oxide-based heat-insulating film.

The present invention provides a preparation method and application of a WS2 / g‑C3N5 heterojunction material, and relates to the technical field of heterojunction photocatalytic materials. The heterojunction material is composed of a layered g‑C3N5 and a layered WS2, and is in-situ synthesized by a hydrothermal method, and the preparation process is simple. The layered g‑C3N5 and the layered WS2 are stacked layer by layer to achieve maximum interface recombination. The strong interface effect ensures the efficient separation and transmission of photogenerated carriers. At the same time, the wide spectral response range and saturated light absorptivity of WS2 ensure the efficient absorption of sunlight by the heterojunction material. The WS2 / g‑C3N5 heterojunction material has good visible light degradation performance for various dye wastewaters.

The invention discloses a forging method of a high-uniformity beta-state titanium alloy stepped forge piece. The forging method comprises the steps of cogging forging, first-time static recrystallization homogenization forging, second-time static recrystallization homogenization forging, stepped forge piece two-phase region drawing blank forging, finished product forging and the like. By the adoption of the method, the produced forge piece is of a uniform lamellar structure, the forge piece can obtain high fracture toughness, and the service life of the shaft forge piece can be prolonged.

The invention discloses a TPMS lamellar and rod-shaped mixed lattice structure and a generation method thereof, and relates to the field of material structure design, the method comprises the following steps: S1, selecting a TPMS lamellar structure type and a rod-shaped structure type to be connected; s2, selecting a TPMS skeleton structure type according to the selected rod-shaped structure type; s3, generating a TPMS lamellar structure and a TPMS skeleton structure according to the selected TPMS lamellar structure type and TPMS skeleton structure type, generating a transition structure of the two structures by using functions of the TPMS lamellar structure and the TPMS skeleton structure, and bridging the two structures by using the transition structure to obtain an intermediate structure; and S4, generating a rod-shaped structure according to the selected rod-shaped structure type, and replacing the non-transition region of the middle structure to obtain the TPMS lamellar and rod-shaped mixed lattice structure comprising a TPMS lamellar structure, a transition structure and a rod-shaped structure which are connected in sequence. According to the method, the transition structure is generated by recognizing the boundary distribution similarity of the TPMS skeleton structure and the rod-shaped structure, and continuous and flexible connection of the TPMS sheet layer and the rod-shaped structure is achieved.

Disclosed are methods for preparing non-filamentous scaffolds (e.g., sheets) for cell or tissue culture. These methods can comprise providing at least a first printing composition (e.g., a bioink) and a second printing composition (e.g., a bioink or a fugitive ink); chaotic printing the first printing composition and the second printing composition to generate a microstructured precursor comprising a plurality of lamellar structures formed from the first printing composition and the second printing composition; extruding the microstructured precursor through a nozzle (e.g., a fan-shaped nozzle, a curved fan-shaped nozzle, or an annular nozzle) to produce a non-filamentous microstructured precursor; and curing the non-filamentous microstructured precursor to provide the non-filamentous scaffold for cell or tissue culture.

The invention belongs to the technical field of preparation of polytetrafluoroethylene composite materials, and provides an impact-resistant and heat-stable polytetrafluoroethylene composite material and a preparation method thereof. Montmorillonite enhances the strength and barrier property of the material through physical crosslinking and barrier action of a layered structure, and improves the dispersity, interface bonding force and thermal stability through grafting modification and metal ion exchange; the strength, the toughness and the wear resistance of the composite material are improved due to the high specific surface area and the small-size effect of the nanoparticles, and the interfacial compatibility and the impact resistance are optimized through coating modification of the silane coupling agent, the toughening monomer and the rubber; the polyacrylonitrile-based carbon fiber enhances the mechanical and conductive properties of the composite material by virtue of high strength and heat resistance, and further improves the interface bonding force and mechanical locking effect by virtue of mixed acid oxidation and chemical vapor deposition modification; through the synergistic effect of the three components, the mechanical, thermal and functional optimization of the composite material is realized.

The invention discloses a forging method for regulating and controlling the structure uniformity of a TiAl alloy, and belongs to the technical field of TiAl alloy material processing. According to the method, a TiAl alloy ingot is coated with a soft sheath, X-Y-Z three-dimensional six-pass reversing forging is carried out, then the sheath is removed, long-time annealing is carried out, X-Y-Z three-dimensional six-pass reversing forging is carried out again, and a TiAl alloy forging stock with a fine and uniform equiaxed structure is obtained; according to the method, the first round of six-pass forging is conducted on the blank through the X-Y-Z three-dimensional multi-pass reversing forging technology, short-time annealing is conducted between the passes, through the mode of combining dynamic recrystallization and sub-dynamic recrystallization, evolution of a thick and large as-cast structure in a TiAl alloy ingot is promoted, a fine equiaxed structure is formed, the uniformity of the forging stock is improved, and the yield of the TiAl alloy ingot is increased. And the blank is subjected to long-time annealing treatment, growth and spheroidization of residual lamellar structures are achieved, second-round six-pass forging is conducted, the grown equiaxed structures are refined, it is ensured that the TiAl alloy forging stock has the fine and uniform equiaxed structures, and the mechanical property of the TiAl alloy forging is improved.

The invention discloses a metal-intermetallic compound composite material with a brick mud structure and a preparation method, and belongs to the field of bionic composite materials. According to the method, metal foil and Al foil are subjected to surface pretreatment and then subjected to ultrasonic cleaning, the metal foil and the Al foil are stacked according to the mode that the metal foil and the Al foil serve as units, a vacuum hot pressing sintering device is used for pre-sintering the metal foil and the Al foil to obtain a metal-intermetallic compound layered composite material, then the metal-intermetallic compound layered composite material is cut into a specific size and subjected to secondary sintering in a mold, and a high-temperature and high-pressure method is adopted for secondary sintering. The invention aims to obtain the brick mud structure metal-intermetallic compound layered composite material with a compact structure. Wherein the intermetallic compound serves as a'brick 'and is uniformly distributed in the metal, the metal serves as a'mud' and serves as an integral tissue framework, the material is closer to a natural shell structure in structure, and the mechanical property of the material is far better than that of a traditional composite material of a layered structure. According to the method, the comprehensive mechanical property of the traditional layered composite material can be effectively improved.

The invention provides a flaky EU-1 molecular sieve as well as a preparation method and application thereof. The EU-1 molecular sieve is of a lamellar structure, the lamellar thickness is 20-50 nm, the silica-alumina ratio is high, the specific surface area is large, and the stability is high. The method for synthesizing the flaky EU-1 molecular sieve is a one-step synthesis process, is simple to operate, high in synthesis efficiency, high in product purity and good in repeatability, does not need to add organic alkali, and is low in cost.

The invention relates to the field of materials, and provides a layered Ti3C2Tx / MXene loaded FeCo nanoparticle composite material, a preparation method and application, FeCo nanoparticles prepared by a hydrothermal method and Ti3C2Tx / MXene prepared by an in-situ etching method are combined by adopting an electrostatic self-assembly method, so that the composite material with a layered structure is obtained, and the FeCo nanoparticles with soft magnetic properties are loaded between layers and on the surface of the Ti3C2Tx / MXene material. The FeCo nanoparticles can adjust the dielectric property of the composite material, so that the composite material can be widely applied to the field of wave absorption. The method has the beneficial effects of simple equipment, low production cost, high production efficiency, greenness and no pollution. The composite material is a high-reflection and low-absorption material in the frequency band of 170-220GHz, and the absorption rate is 10-30%. In the range of 0.2-3 THz, the product prepared by the method also has a wave-absorbing effect, and the absorption coefficient is 100-150 cm <-1 >.