13results about How to "High specific strength" patented technology

This invention relates to the field of polymer materials technology, specifically to a method for preparing and applying a rigid polyimide foam reinforced with aluminum honeycomb. The method for preparing the rigid polyimide foam reinforced with aluminum honeycomb provided by this invention includes steps such as surface pretreatment of the aluminum honeycomb core material and fixing the pretreated aluminum honeycomb core material into a molding die. The rigid polyimide foam material reinforced with aluminum honeycomb obtained by this invention not only possesses high specific strength and high specific stiffness, but also inherits the excellent properties of polyimide foam such as high temperature resistance, flame retardancy, low smoke, and thermal insulation. The introduction of the aluminum honeycomb skeleton also improves the material's impact resistance and dimensional stability, making it an ideal multifunctional integrated lightweight structural material with promising application prospects.

This invention discloses a method for preparing high-entropy ceramic matrix composites using a reactive infiltration process, belonging to the technical field of ceramic matrix composites. The steps are as follows: at least four single-component carbides are ball-milled and mixed with a carbon source, then dispersed in a dispersion liquid to obtain a slurry; continuous fibers are woven into a preform, and an interface layer and a matrix layer are deposited to obtain a semi-dense composite material; the slurry is introduced through vacuum or pressure impregnation; and a high-entropy carbide matrix is ​​generated in situ and densified by reactive infiltration after embedding with a transition metal and its alloy. This invention solves the problems of long process cycles, high porosity, high cost, and insufficient introduction of high-entropy ceramics in existing processes, achieving rapid densification and improving the material's high-temperature stability, oxidation resistance, and ablation resistance. It is suitable for the large-scale production of thermal protection materials for hypersonic vehicles.

The application discloses a non-welding accessory connecting structure of a wind power tower drum, the wind power tower drum and a construction method thereof, and relates to the technical field of wind power generation equipment. Technical scheme points of the application are as follows: the application comprises a rooting piece for connecting with an accessory structure, a structural adhesive layer coated between a mounting surface of the rooting piece and an inner wall of a tower drum body, and a resin fiber composite material coating layer which is cured and formed to wrap a root part of the rooting piece and is fixedly connected with the inner wall of the tower drum body through the structural adhesive layer. The application can effectively disperse stress generated by accessory load, avoid a welding heat affected zone, welding residual stress and stress concentration at a welding toe, eliminate negative effects of welding of the accessory on fatigue strength of a main steel plate of the tower drum, and make the fatigue strength grade of the main steel plate not be reduced due to connecting details.

This invention belongs to the field of thermoplastic composite material joining technology, and specifically relates to a method for preparing a silane-modified thermoplastic composite resistance welding heating element. The invention first performs a cleaning pretreatment on a carbon nanotube film to remove surface contaminants. Then, plasma treatment technology is used to etch and activate the film surface, introducing oxygen-containing groups to provide active sites for silane grafting. Finally, silane is grafted onto the plasma-activated film using a silane coupling agent, utilizing its bifunctional properties to construct a molecular bridge between the carbon nanotubes and the resin, thereby improving the interfacial bonding force between the film heating element and the resin, and increasing the resistance welding strength. The heating element prepared by this invention has high specific strength, corrosion resistance, and better homogeneity with the base material, making it more suitable for complex welding joint service environments.

The utility model provides a kind of carbon fiber roller, including pipe body, inner flange, outer flange, pipe body includes inner end and outer end, inner flange is installed in inner end, and outer flange is installed in outer end;The pipe body is carbon fiber pipe body, and the pipe wall of carbon fiber pipe body is equipped with punching part, and carbon fiber roller realizes significant light weight and high specific strength simultaneously, and the layout of vent hole of punching part is optimized to balance ventilation efficiency and structural strength.

The invention relates to a reinforced toe cap fabric, the fabric comprises first knitting areas and second knitting areas which are alternately distributed, the first knitting areas are formed by knitting weft yarns and aramid warp yarns into a three-layer three-dimensional deep angle connection structure, the second knitting areas comprise first parts and second parts which are alternately distributed, and the first knitting areas and the second knitting areas are formed by knitting weft yarns and aramid warp yarns into a three-layer three-dimensional deep angle connection structure. The first part is formed by weaving weft yarns and aramid warp yarns in a three-layer three-dimensional deep angle connection structure, and the second part is formed by weaving weft yarns, carbon fibers and thermofuse warp yarns in a three-layer plain structure. The reinforced toe cap fabric is integrally formed, so that the integration of the structure and the function is realized; high-performance fibers are blended, respective characteristics are fully exerted, and defects are avoided; the weight of a product is reduced, the performance of the product is improved, on the basis that the test passes, 70-80 grams can be produced for each pair, and the weight of a conventional composite toe cap on the market is about more than 100 grams; and the material with high specific strength and high specific modulus is more comfortable.

The application discloses a titanium alloy special-shaped material production process for a mobile phone physical SIM card holder, and comprises the following steps: continuously hot-rolling titanium alloy wire rods to deform to corresponding sizes; performing acid pickling at least once before the last hot-rolling to remove the surface oxides of the wire rods; performing annealing treatment at least once after the last hot-rolling; performing cold-rolling and shape correction after the annealing to make the cross-sectional size of the product meet the final product size; performing annealing treatment at least once after the cold-rolling; performing acid pickling at least once after the cold-rolling and annealing treatment to remove the surface oxides of the wire rods; cutting after online straightening to form the final special-shaped material for the SIM card holder; and the multiple rolling and heat treatment mode solves the problem of difficult machining and forming of the titanium alloy, the shape of the wire rod is shaped through cold-rolling, the titanium alloy wire rod is shaped, and the mobile phone SIM card holder special-shaped material is formed through rolling.

This invention discloses a bamboo fiber, its preparation method, and a bamboo fiber wound hydrogen storage tank. The preparation method of the bamboo fiber includes the following steps: cutting natural bamboo into equal-length bamboo poles and pretreating them by soaking them in boiling water to remove water-soluble organic matter; mixing hydrogen peroxide, organic acid, and H2SO4 in a certain proportion to prepare a peroxyacid solution, wherein the concentration of hydrogen peroxide in the peroxyacid solution is 7-24 wt%, the concentration of organic acid is 15-55 wt%, and the concentration of H2SO4 is 0.5-3 wt%; soaking the pretreated bamboo poles in the peroxyacid solution at 50-60℃ for 12-20 hours to obtain bamboo fiber; then soaking the bamboo fiber in an alkaline solution for neutralization, and washing it after neutralization; vacuum drying the washed bamboo fiber and twisting it to extend its length to obtain long fiber; and applying microwave irradiation to the long fiber to obtain the final product.

The utility model discloses a PET (Polyethylene Terephthalate) composite special-shaped part and an autoclave forming and curing device thereof, and belongs to the technical field of thermal forming of composite materials. The PET composite special-shaped part comprises an L-shaped first bending part, a transverse part and an L-shaped second bending part which are integrally formed, and PET + CFRT prepreg enters the forming lower die and the forming upper die after being subjected to linkage rotation through the first feeding roller pair and the second feeding roller pair; then packaging the forming lower mold, the forming upper mold, the first feeding roller pair and the second feeding roller pair by adopting a vacuum bag, then sealing, and then integrally pushing the autoclave forming and curing device into an autoclave for heating, pressurizing and curing, so as to obtain the PET composite special-shaped part. The PET composite special-shaped part which is light in weight, high in specific strength, high in wear resistance, anti-fatigue and good in forming process is designed to replace an existing adaptive connecting part made of a pure metal material, and the technical requirements for good function application of overall weight reduction, high specific strength, high wear resistance and anti-fatigue in an application scene are met.

The application belongs to the technical field of composite materials, and particularly relates to a hybrid continuous fiber 3D printed double-diagonal reinforced bionic lattice composite structure, a tough phase outer frame constraint structure, and a high-strength bearing core structure. The tough phase outer frame constraint structure is a simple cubic lattice configuration and is made of continuous glass fiber reinforced polyamide composite material. The high-strength bearing core structure is a double-diagonal line topology configuration of a deep-sea glass sponge and is made of continuous carbon fiber reinforced polyamide composite material. The application adopts a differentiated material layout strategy of "high toughness of outer frame and high strength of core body", prepares the outer frame constraint structure by using CGF / PA high-toughness composite material, effectively disperses external impact load, delays initial cracking of the structure, reduces the initial peak force of compression, and inhibits local stress concentration and micro-defect expansion on the basis of excellent fracture toughness and deformation adaptation characteristics.

This invention relates to the field of high-performance carbon composite materials, and more particularly to a high thermal conductivity pyrolytic graphite foam, its preparation method, and its applications. This invention constructs a "mesophase pitch-based carbon foam-carbon fiber cloth" sandwich composite structure by alternately layering mesophase pitch-based carbon foam and carbon fiber cloth, obtaining a high thermal conductivity pyrolytic graphite foam with high thermal conductivity, high anisotropy, high graphitization degree, and excellent mechanical properties. This solves the problem of insufficient performance of existing carbon foam materials and reveals its structure-property relationship, providing a new technical approach for the development and application of high-performance thermal management materials. It has significant scientific and application value for promoting the development of high-performance thermal management materials. The high thermal conductivity pyrolytic graphite foam provided by this invention combines high deposition uniformity, high multidimensional thermal conductivity, and excellent mechanical properties, and has broad application prospects in the fields of electronic device heat dissipation or aerospace thermal management.

This invention provides a tunable gradient-curved sound barrier structure and method based on 3D printing, belonging to the field of environmental noise control technology. The sound barrier unit is fabricated using an integrated molding process. Its core lies in the internal construction of a folded, curled topological skeleton with a gradient distribution along the sound wave propagation direction. This skeleton extends vertically to form a three-dimensional solid. The geometry and spacing of the internal folded channels can be parametrically adjusted to achieve precise matching with the target noise spectrum characteristics. In terms of manufacturing process and materials, this invention employs selective laser sintering technology, using modified microporous nylon composite material as raw material. For highway traffic noise scenarios, this structure effectively extends the sound wave propagation path and induces sound energy dissipation by utilizing gradient-changing folded channels, achieving efficient insertion loss in the two energy-concentrated frequency bands of 315-500Hz and 800-1250Hz. Simultaneously, combined with the micropores and high damping characteristics of the material, it effectively suppresses the coincidence effect.

The invention relates to a four-axis unmanned aerial vehicle shell, in particular to a 3D-printed integrated porous structure four-axis unmanned aerial vehicle shell and a manufacturing method thereof. The shell is of a triple periodic TPMS lattice porous structure, and the triple periodic TPMS lattice porous structure is formed by permutation, combination and connection of a plurality of repeated TPMS basic units; in the direction from the fixed end to the free end of the vehicle arm, the TPMS basic units are gradually arranged according to gradient change, and the wall thickness of crystal lattices is gradually increased; the four-axis unmanned aerial vehicle shell is high in heat dissipation performance and has the excellent energy absorption characteristic, and the structural weight is further reduced; the light weight effect is remarkable while the protection performance of the shell is improved, and the structural strength and the light weight characteristic are both considered.