23results about How to "Strong mechanical properties" patented technology

The application belongs to the field of acoustics, and discloses a low-frequency and wide-band noise reduction acoustic structure and a design method of the acoustic structure. The acoustic structure comprises a plurality of acoustic structural members and an embedded member. At least one embedded member is arranged in the plurality of acoustic structural members. On the same embedded member, the acoustic structural members in communication with the two open ends of the embedded member are arranged in pairs and jointly form a first unit. The acoustic structural member not in communication with the embedded member is a second unit. The first unit and the second unit are arranged in parallel. Compared with the prior art, when sound waves pass through the acoustic structural members arranged in pairs, the coupling resonance generated in the acoustic structural members can widen the noise reduction frequency band at a certain resonance frequency in the low-frequency range. The added embedded member can generate a new noise reduction frequency band. The weak coupling effect between the parallel units can further widen the noise reduction frequency band. Finally, the low-frequency and wide-band noise reduction effect is achieved.

A golf club head alloy is provided to solve the problem that the existing alloy cannot be used to make a striking face plate. The golf club head alloy includes 11-13% by weight of molybdenum, 5-7% of zirconium, 0.5-2.5% of iron and 3-4% of aluminum, and the golf club head alloy further includes a balanced amount of titanium and inevitable impurities. Through the above-mentioned composition, the hard and brittle phase of the golf club head alloy can be reduced, so that the striking face plate made of the golf club head alloy can pass the golf ball impact test, and whether the striking face plate is heat treated is determined according to the needs of the user, so that the striking face plate can have high rebound performance or high strength characteristics. The present application also relates to a method for manufacturing a golf club head from the golf alloy.

The application discloses a kind of PEI or PEEK-based 3D printing wave-absorbing materials and preparation method thereof.The 3D printing wave-absorbing material includes the following components by mass fraction: polyetherimide resin or polyether ether ketone resin: 45~65 parts;Electromagnetic wave absorber: 10~50 parts;Impact modifier: 4~12 parts;Flow aid: 2~8 parts;Antioxidant: 0.5~3 parts;Wherein, the electromagnetic wave absorber includes magnetic absorber and carbon-based absorber, the impact modifier and the carbon-based absorber are pre-coated to form the carbon-based absorber coated with the impact modifier on the surface, and the magnetic absorber is surface modified by silane coupling agent.The application significantly improves the mechanical properties and thermal stability of the material by using specific raw material composition and combining specific multi-layer co-extrusion and online heat treatment process.The preparation process is simple and easy to operate, and is suitable for industrial continuous production.

The application provides a precision preformed soldering piece and a preparation method thereof. By arranging a graphene layer between the preformed soldering piece and a flux layer, the welding quality and efficiency can be improved, the energy consumption and environmental pollution in the welding process can be reduced, the welding strength and corrosion resistance can be improved, the oxidation and thermal stress in the welding process can be reduced, the cavity rate can be reduced, the precision can be improved, fullerene is added in the alloy raw material, the fullerene has high chemical stability and strong mechanical properties, can form strong bonding with rare earth metals, has high heat conduction performance, can effectively dissipate heat, avoids overheating of the welding part to cause failure, significantly reduces the cavity rate, improves the precision of the welding, reduces the welding temperature required by the preformed soldering piece, and has excellent oxidation resistance, which can effectively prevent the oxidation of the metal surface.

The utility model relates to the technical field of cable maintenance devices, and discloses a device for testing a temperature sensing cable, which comprises a box body assembly, the interior of the box body assembly is of a hollow structure, a first surface and a second surface of the box body assembly are provided with holes, and the first surface and the second surface are two opposite surfaces of the box body assembly. The hollow structure and the two open holes form an accommodating cavity for accommodating a temperature sensing cable; the heating piece is arranged in the box body and is used for heating the accommodating cavity; and the temperature control assembly is arranged in the box body, the temperature control assembly is electrically connected with the heating piece, the temperature control assembly is used for obtaining the temperature in the containing cavity, and the temperature control assembly is further used for controlling the heating temperature of the heating piece. The temperature-sensing cable monomer debugging device can reduce the test manpower demand, improve the working efficiency of testers, can be repeatedly used in a subsequent nuclear power unit, reduces the material loss, can be used for debugging the temperature-sensing cable monomer of a nuclear power plant fire alarm system, and can also be used for debugging other monomers equipped with temperature-sensing cables for nuclear power plant and the like.

The application belongs to the technical field of negative electrode materials of aqueous zinc ion batteries, and discloses a preparation method of a negative electrode coating material of an aqueous zinc ion battery and application thereof. The application uses graphite phase carbon nitride as a matrix material, loads enzymatic hydrolysis lignin in the graphite phase carbon nitride to synthesize enzymatic hydrolysis lignin graphite phase carbon nitride composite material, the synthesized material not only has strong mechanical properties and chemical stability, but also can effectively inhibit the corrosion of electrolyte to the surface of zinc negative electrode. The enzymatic hydrolysis lignin is loaded on the graphite phase carbon nitride to prepare the required zinc negative electrode coating material. The coating material serves as a protective layer of the negative electrode material of the aqueous zinc ion battery, can solve the problems of the zinc ion battery negative electrode in the charging and discharging process, inhibit hydrogen evolution, corrosion, side reaction and dendrite of the zinc negative electrode, and effectively improve the stability and charging and discharging cycle efficiency of the aqueous zinc ion battery.

This invention relates to a bio-based polyamide carbon fiber reinforced material, comprising the following components: 100 parts by weight of pentanediamine polyamide resin; 10-30 parts by weight of furanyl polyester resin; 1-5 parts by weight of chain extender; and 10-50 parts by weight of carbon fiber. The preparation method includes acid-alcohol treatment of the carbon fiber: impregnating the carbon fiber in a liquid of polybasic acid and polyol, heating and dehydrating it, then blending the acid-alcohol treated carbon fiber with pentanediamine polyamide resin, furanyl polyester resin, and chain extender, and curing to obtain the reinforced material. This invention improves the bond strength and water absorption of pentanediamine polyamide and carbon fiber, resulting in a reinforced material with strong mechanical properties, low water absorption, and a certain degree of biomass content.

The invention provides a silicon-carbon composite material as well as an appearance evaluation standard and application thereof, and relates to the technical field of battery negative electrode materials. The silicon-carbon composite material comprises sphere-like silicon-carbon particles, and each sphere-like silicon-carbon particle comprises a silicon-carbon plane and a silicon-carbon transition cambered surface adjacent to the silicon-carbon plane; and the minimum value of the curvature of the cambered surface infinitesimal element of the silicon-carbon transition cambered surface at the joint of the silicon-carbon transition cambered surface and the silicon-carbon plane is 0. The material is of a sphere-like structure containing a plane and an adjacent transition cambered surface, the structure and a base body can form three-dimensional interlocking, mechanical binding force is enhanced, interface crack propagation is restrained, particles can be promoted to be directionally arranged to form regular and uniform slit-shaped channels / pores, the compression resistance and abrasion resistance of the material are improved, the stacking density is increased, and the contact area is increased. And the silicon-carbon composite material has excellent electrochemical performance. The shape evaluation standard represented by the polyhedron degree Q (0-1, the closer to 1, the closer to an ideal polyhedron) is provided, the problem that the shape of an existing polyhedral material lacks a unified evaluation standard is solved, a scheme is provided for similar polyhedral material evaluation, and material design, screening and application are promoted.

This invention belongs to the field of concrete building materials technology, and discloses a fiber-reinforced concrete segment suitable for dual control of micro-cracks and macro-cracks, and its preparation method. The fiber-reinforced concrete segment comprises cement-based concrete and crack-resistant fibers and structural fibers compositely added to the cement-based concrete. The crack-resistant fibers are fine steel fibers with a diameter of 0.15-0.25 mm and a length of 10-15 mm; the structural fibers are coarse polypropylene fibers with a diameter of 0.8-1.2 mm and a length of 40-60 mm; the volume fraction of the crack-resistant fibers is 0.5%-0.8%; and the volume fraction of the structural fibers is 0.5%-0.9%. The fiber-reinforced concrete segment provided by this invention can achieve continuous crack control, synergistic effect, and better economic efficiency.

The utility model discloses a composite I-shaped beam structural plate based on 3D printing. The composite I-shaped beam structural plate is of a series of rectangular grid structures composed of a plurality of I-shaped beam components, a front-layer surface plate, a rear-layer surface plate, a left-layer surface plate, a right-layer surface plate and rectangular beams. The front and rear surface plates and the left and right surface plates are horizontally arranged in parallel and are mutually connected to form a rectangular frame structure; the I-shaped beams and the rectangular beams are arranged in the rectangular frame structure, the rectangular beams are arranged on the front portion and the rear portion of each row of I-shaped beam component set respectively, the two ends of each rectangular beam are connected with the left surface plate and the right surface plate, the rectangular beams are arranged in four rows, and each I-shaped beam component is connected with the front rectangular beam and the rear rectangular beam of the I-shaped beam component into an integrated structure. The composite I-beam structural slab based on 3D printing provided by the utility model has stronger mechanical properties and can meet the requirements of different working environments. The I-shaped beam structure has various mechanical properties such as excellent impact resistance, wearing resistance, folding resistance and bending performance.

The application relates to a Ni-W bimetallic catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: I. dissolving a soluble nickel salt, a soluble tungsten salt, and urea and ammonium fluoride in water to form a precursor solution; II. taking carbon paper as a carrier, immersing the precursor solution obtained in the step I in water, and performing hydrothermal reaction to grow the catalyst on the carbon paper; III. performing heat treatment on the carbon paper loaded with the catalyst obtained in the step II under a nitrogen atmosphere to prepare the Ni-W bimetallic catalyst. The Ni-W bimetallic catalyst prepared by the application presents a nano flower morphology, exposes more reaction active sites, the surface of the Ni-W bimetallic catalyst co-modified by single-atom tungsten and metal defects can enhance the adsorption of 5-hydroxymethylfurfural, the bulk phase composed of the Ni-W solid solution induces the generation of more active sites, greatly improves the overall catalytic activity, and realizes high HMF conversion rate, high 2,5-furan dicarboxylic acid yield and high faraday efficiency.

A method for dynamic adjustment of frequency locking feedback phase in strong interference is disclosed, which comprises the following steps: scanning laser frequency by modulating driving current of semiconductor laser, collecting transmission cavity mode signal of optical resonant cavity by photoelectric detector, obtaining error signal for controlling feedback phase based on asymmetry and amplitude of transmission cavity mode signal, amplifying error signal by high voltage amplifier and then applying it to piezoelectric ceramic material with mirror adhered, controlling expansion and contraction of piezoelectric ceramic, and realizing dynamic adjustment of feedback phase. The method has very wide phase adjustment range based on asymmetry and amplitude of transmission cavity mode signal, and can realize stability of feedback system even in harsh environment.

The application belongs to the technical field of polyethylene, and particularly relates to single-kettle bimodal polyethylene for water supply pipes and a preparation method thereof. The single-kettle bimodal polyethylene for water supply pipes is prepared by using ethylene as raw material, hydrogen as molecular weight regulator, a main catalyst and a cocatalyst, and a gas phase fluidized bed process to perform copolymerization with 1-hexene in a single reactor. The main catalyst is a supported metallocene bimetallic catalyst which is prepared by loading bis(cyclopentadienyl)zirconium dichloride, dichlorotitanocene and bis-arene imidazole pyridine iron complex on a silica carrier. The length of tie molecules and the lamella thickness are increased by increasing the polyethylene molecular weight. Meanwhile, the content of the comonomer in the polyethylene molecular chain is increased, which further increases the entanglement effect of the tie molecules between the lamellas, so that the lamellas are not easy to slip, thereby improving the slow crack growth resistance of the material.

The invention discloses a carbon fiber transmission shaft and a forming mold and a forming method thereof, and relates to the field of carbon fiber composite materials. The carbon fiber transmission shaft comprises a transmission shaft body and a shaft head. The transmission shaft body is made of a carbon fiber composite material and is tubular, and shaft heads are arranged in cavities at two ends of the transmission shaft body; the shaft head is made of metal or alloy and is tubular; the shaft head and the transmission shaft body are installed in an inverted fit mode. And the shaft head and the transmission shaft body are co-cured integrally formed parts. The invention further discloses a forming die and a forming method, reverse buckling type connection and co-curing integrated forming of the transmission shaft body and the shaft head can be achieved on the basis of the forming die and the forming method, and the defects caused by the fact that in the prior art, a carbon fiber composite transmission shaft cannot be wound away after connection and after connection are overcome. The connection strength of the carbon fiber composite transmission shaft is improved, the dynamic balance of the transmission shaft is optimized, and the production efficiency is improved.

The invention belongs to the field of flexible battery energy storage, and relates to a flexible self-supporting material and a preparation method and application thereof. The flexible self-supporting material comprises a carbon nanotube film, a Si / Ge film and a liquid metal film which are arranged in sequence. According to the invention, the carbon nanotube film is used as a flexible carrier, has good flexibility, mechanical property, conductivity and ultra-light weight, can greatly reduce the proportion of inactive substances in the electrode, and improves the energy density of the electrode material. Meanwhile, Si is easy to fall off from the traditional current collector Cu to cause damage to the electrode structure, and the carbon nanotube film well improves the defect and improves the stability of the electrode material.

The application discloses a kind of porous composite polymer solid electrolyte and preparation method and solid sodium ion battery thereof.The porous composite polymer solid electrolyte of the application is made of deep eutectic solvent, additive, polymer solution and sodium superionic conductor;The deep eutectic solvent is composed of sodium ion-containing hydrogen bond acceptor and hydrogen bond donor, the sodium ion-containing hydrogen bond acceptor is selected from any one of sodium hexafluorophosphate, sodium tetrafluoroborate, sodium dihydrogen phosphate, sodium difluoro oxalate borate, sodium bis-trifluoromethyl sulfonamide, sodium bisfluorosulfonamide, sodium perchlorate, sodium nitrate, sodium chloride and sodium difluorophosphate;The additive is ethylene carbonate and propylene carbonate;The polymer solution is composed of polymer and organic solvent;The mass ratio of sodium superionic conductor and polymer is 1: (2-5).The porous composite polymer solid electrolyte of the application has excellent ion conductivity, flame retardancy, strong mechanical properties and excellent safety.

The application provides a high-performance fluororubber material and a preparation method thereof. The high-performance fluororubber material comprises the following components in parts by weight: 60-90 parts of fluororubber, 5-10 parts of modified EPDM, 0.5-3 parts of plasticizer, 15-40 parts of reinforcing agent, 1-5 parts of vulcanizing agent and 0.5-2 parts of acid absorbent. The high-performance fluororubber material prepared by the application has high tensile strength, elongation at break and thermal conductivity, low compression permanent set, high mechanical properties, high thermal conductivity, high elasticity, good anti-aging performance and low compression deformation, and has high material reliability and long service life.

The application provides a tissue engineering gel scaffold and a preparation method, a composite gel scaffold and an application thereof, wherein the tissue engineering gel scaffold comprises a decellularized matrix of a cephalopod, and a tissue source of the decellularized matrix of the cephalopod comprises at least one of a mantle of the cephalopod and a brachialia of the cephalopod. The tissue engineering gel scaffold of the application is based on the decellularized matrix of the cephalopod, has good biocompatibility, and has a regular arrangement structure, strong water absorption performance and strong mechanical properties. The structure, water content, mechanical properties and degradation rate of the tissue engineering gel scaffold are similar to those of soft tissue, the content of high proportion of unsaturated fatty acids, in which the content of omega-3 is much greater than that of omega-6, is beneficial to the inhibition of inflammation and the repair of tissue, and the tissue engineering gel scaffold can be compounded or used in combination with various active molecules, cells and the like, is used for defect filling and tissue repair in soft tissue regeneration, and is beneficial to promoting the soft tissue regeneration process.

The application provides a preparation method of a biological macromolecule bridged alginate salt solvent-resistant gel membrane, selects biological macromolecule blended sodium alginate as a membrane casting liquid, coats the membrane on a non-woven fabric, and then immerses the non-woven fabric in a crosslinking agent solution containing metal ion salt to crosslink and form a membrane, so as to obtain a biological macromolecule bridged alginate salt gel membrane; the application utilizes the physical and chemical action between the biological macromolecule and the alginate salt to change the polymer network structure and improve the crosslinking degree, so that the membrane pore structure is more compact and stable, the gel membrane with high flux, good solvent resistance and strong mechanical property is obtained, and the gel membrane has wide application prospects in solute separation and solvent recovery in various organic solvent systems.

The invention provides a positive plate, a preparation method and a battery. The positive plate comprises a positive current collector and a positive active material layer, the positive electrode active material layer comprises a first positive electrode active material layer and a second positive electrode active material layer which are sequentially arranged in the direction away from the surface of the positive electrode current collector, the first positive electrode active material layer comprises lithium nickel manganese oxide, and the second positive electrode active material layer comprises lithium nickel cobalt manganese oxide; the first positive electrode active material layer adopts lithium nickel manganese oxide, has a more stable crystal structure and stronger mechanical property, and can provide more stable adhesive force and a more stable interface as a bottom layer in contact with the positive electrode current collector, so that the overall mechanical property and thermal stability of the positive electrode plate are enhanced; the second positive electrode active material layer adopts low-cobalt nickel cobalt lithium manganate and can be in direct contact with an electrolyte, the capacity advantage of the second positive electrode active material layer is fully played, and meanwhile, the volume change of the second positive electrode active material layer is supported and constrained by a bottom layer stable structure, so that the cycling stability of a high-capacity material is remarkably improved.

The application provides a weather-resistant antibacterial polyurethane coating, raw materials of the polyurethane coating including polyether triols, isophorone diisocyanate, hydroxyethyl methacrylate and nano-silver loaded aliphatic amine modified graphene oxide. The application also provides a preparation method of the weather-resistant antibacterial polyurethane coating. The weather-resistant antibacterial polyurethane coating obtained by the application has good mechanical properties, strong antibacterial property, strong water resistance and strong acid resistance, good high and low temperature aging performance, long service life and wide application scenarios.

This invention provides a method for preparing porous interconnected hollow carbon nanofiber membranes, belonging to the field of nanomaterial preparation technology. The method first uses a mixture of MOF and a polymer as a shell precursor solution, and SAN resin or PMMA as a core layer precursor solution. A mixed matrix membrane material is prepared through coaxial electrospinning and subsequent carbonization. In the mixed matrix membrane, the SAN resin or PMMA acts as a self-sacrificial template, undergoing carbonization and volatilization to induce the formation of hollow carbon nanofibers. Meanwhile, the MOF induces the formation of porous structures on the hollow carbon nanofibers through interfaces, interconnecting them via hollow channels. This method is simple to operate, streamlined, and can be mass-produced, possessing significant practical application value in the fields of energy catalysis and environmental protection.

This invention provides a modified recycled coarse aggregate, its preparation method, and its application, belonging to the field of construction waste recycling. The invention involves adding an oil phase to an aqueous phase and stirring to obtain an O / W type emulsion; the oil phase includes a lipophilic emulsifier and a silane coupling agent; the aqueous phase includes an aqueous solution of a nonionic surfactant; and nano-SiO₂... 2 A composite emulsion is obtained by mixing the O / W type emulsion with the composite emulsion; the recycled coarse aggregate is then soaked in the composite emulsion to obtain modified recycled coarse aggregate. The composite emulsion obtained by this invention can form a dense hydrophobic network on the surface and inner capillary walls of the recycled aggregate and effectively fill the micropores, inhibiting the absorption of water by the recycled aggregate. Simultaneously, it improves the compatibility between nano-silica and the recycled coarse aggregate, thereby increasing the strength of the recycled coarse aggregate. Data from the examples show that the concrete prepared using the modified recycled coarse aggregate of this invention exhibits good waterproofing and compressive strength.