38 results about "Specific modulus" patented technology

The present invention discloses a process and a plate for three-dimensionally weaving a plate with channels, comprising: arranging yarns on a three-dimensional weaving base according to the shape of the plate, not arranging yarns in the empty positions of the channels, and weaving the plate with channels in three dimensions according to a four-step method. In the present invention, a three-dimensional weaving plate with channels is made using three-dimensional weaving technology. This plate has good structural integrity and strong load-bearing performance. It will not delaminate after being subjected to force. The design of its channels can reduce the weight of the plate while also having the function of thermal insulation. Furthermore, the shape, arrangement, and number of the channels in the present invention can be designed according to the working conditions of the product, which is conducive to reasonably improving the mechanical contribution rate of the fiber. The plate with channels of the present invention has high specific strength and high specific modulus, and can be matched with the selection of materials to meet the needs of aerospace, rail transportation, sports and leisure, construction and other fields for different composite material plates.

A paper comprising polymeric fibers and a binder, wherein the polymeric fibers comprise first fibers and second fibers, the first fibers comprising an aramid copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, the second fibers comprising poly(para-phenylene terephthalate) homopolymer, and the binder comprising a third polymer that is either an aramid homopolymer or aramid copolymer; the paper having an ultimate tensile strength of 21 N-m / g or greater and average specific modulus of 4950 Pa-m3 / g or greater.

This invention belongs to the field of glass substrate technology, specifically relating to an alkali-free glass substrate and its preparation method, comprising the following raw materials: SiO2, Al2O3, MgO, CaO, BaO, SrO, and B2O3 / C composite microparticles. B2O3 and C are dispersed by laser irradiation ablation combined with microwave and stirring to form uniform and dense nanoparticles. The B2O3 / C composite microparticles significantly improve the clarification effect and reduce the coefficient of thermal expansion. This not only reduces shrinkage deformation during molding but also suppresses flexural deformation during subsequent processing, and increases Young's modulus and specific modulus, which is beneficial for manufacturing thinner and lighter liquid crystal displays. Furthermore, the B2O3 / C composite microparticles coated with silica provide better clarification with a lower content, resulting in an alkali-free glass substrate with a lower coefficient of thermal expansion and higher Young's modulus and specific modulus.

A paper comprising polymeric fibers and polymeric binder, the polymeric fibers comprising a first polymer that is a copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, and the polymeric binder comprising a second polymer that is a copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, the paper having a density of 0.5 grams per cubic centimeter or less and an average specific modulus of 8500 Pa-m3 / g or higher.

The present invention belongs to the technical field of glass fibers, and specifically relates to a high-magnesium, high-specific modulus glass fiber composition and glass fibers. The mass percentages of the components are SiO2: 58.5-63.0%, Al2O3: 15.0-20.0%, CaO: 0.3-2.5%, MgO: 16.0-19.5%, Fe2O3: 0.2-0.6%, Y2O3+B2O3: 1.0-3.5%, B2O3: 0.1-1.0%, and K2O+Na2O: 0.3-0.8%. The present invention significantly increases the MgO content, increases the SiO2 content, reduces the Al2O3 and CaO contents, and adjusts the usage ratio of MgO / Al2O3, thereby achieving a density of the glass fiber composition of 2.610 g / cm. 3 The elastic modulus of the glass fiber is ≧94.0GPa, and the specific elastic modulus is ≧3.67*10 6 m.

A friction transmission belt includes a compression layer forming a pulley contact portion, the compression layer includes an inner layer formed from a rubber composition and an outer layer provided on a pulley contact side of the inner layer and formed from a fiber member, and a ratio (M10 modulus / M50 modulus) of an modulus at 10% elongation in a belt longitudinal direction (M10 modulus) to an modulus at 50% elongation in the belt longitudinal direction (M50 modulus), of the rubber composition, is not less than 1.5.

The invention provides a vibration reduction and sound insulation acoustic material valve and a design method thereof, and belongs to the field of valve design. The valve body is of a valve body structure formed by bonding three basic materials including a metal material, a CFRP material and a damping material instead of an all-metal structure of an original metal valve body, the metal material serves as an inner container, the outer layer of the inner container is coated with the CFRP material to form a CFRP layer, the outer layer of the CFRP is coated with the damping material to form a damping material layer, and the three materials are bonded into a whole through epoxy resin. And materials coated at different positions of the valve body and the thicknesses of the materials are different. The invention further provides a design method of the vibration reduction and sound insulation acoustic material valve. By utilizing the characteristics of high specific strength and high specific modulus of the CFRP material and the vibration reduction and sound insulation performance of the CFRP material and the damping material, the noise reduction and vibration reduction functions of the material can be realized on the premise that the structural weight is not increased and the mechanical property of the material is ensured.

To provide a substrate for magnetic recording media that has high heat resistance and specific modulus, and has low manufacturing costs. [Solution] The magnetic recording medium substrate according to this disclosure has a heat-resistant film on the surface of a steatite sintered body made of one or more alloys selected from the group consisting of SiO2, SiC, Si3N4, and Al2O3.

The application discloses a kind of ultrafine-grained titanium alloy materials and in-situ synthesis method thereof, the method comprises: one, according to the component proportion of target product, element powder is mixed;Two, green body is pressed;Three, laser vacuum smelting is obtained metal precursor;Four, metal precursor is heated to melt by electrostatic suspension equipment and is obtained after heat preservation cooling ultrafine-grained titanium alloy material.The application is by using electrostatic suspension process without using mould, so that metal melt is uniformly nucleated in the process of cooling and solidification and the nucleation rate is significantly increased, form far less than the nanometer scale metal ultrafine equiaxed crystal organization of traditional smelting method, simultaneously, the application realizes the in-situ alloying of titanium alloy material, and the degree of freedom of component design is large, without multiple smelting, production cost is reduced;Ultrafine-grained titanium alloy material of the application has high specific strength, high specific modulus, excellent corrosion resistance, good strength plastic / tenacity matching, and is widely used in aerospace, ocean engineering, weapon equipment and other high-tech fields.

A paper comprising polymeric fibers and polymeric binder, the polymeric fibers comprising a first polymer that is a copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, and the polymeric binder comprising a second polymer that is a copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, the paper having a dielectric strength of 12.0 kV / mm or greater, an average specific modulus of 8000 Pa-m3 / g or higher, and a density of 0.75 grams per cubic centimeter or greater.

This invention provides a fire-resistant electromagnetic shielding composite material and its preparation method. The method includes: Step S1: preparing a surface layer of high-temperature resistant prepreg and an inner layer of prepreg; Step S2: laying out a preform in the following order: several layers of surface layer high-temperature resistant prepreg, several layers of inner layer prepreg, several layers of metal mesh, several layers of inner layer prepreg, and several layers of surface layer high-temperature resistant prepreg; Step S3: hot-pressing the preform to prepare a fire-resistant electromagnetic shielding composite material. This invention is a multi-functional composite material with a multi-layer, multi-type structural design. It not only possesses high specific strength and specific modulus mechanical properties, but also better fire resistance and electromagnetic shielding characteristics. It simultaneously meets the protection requirements under electromagnetic and high-temperature environments. Furthermore, the surface layer material has low thermal conductivity, high thermal stability, and ablation resistance, effectively protecting the integrity of the internal composite material and maximizing the protection of the overall structure and mechanical properties of the composite material.

The invention belongs to the technical field of electroacoustics, and particularly relates to a vibrating plate for a sound production device, a vibrating diaphragm assembly and the sound production device, and main body part preparation raw materials of the vibrating plate for the sound production device comprise an aluminum alloy material and silicon carbide powder mixed in the aluminum alloy material, the volume fraction of the silicon carbide powder in the preparation raw materials of the main body part is 1-50%, the type of the silicon carbide powder is 6H type alpha-SiC, and the particle size D90 of the silicon carbide powder is 0.1-20 [mu] m. The vibration plate with high specific modulus and high yield strength is obtained by controlling the type, the particle size D90, the content and the like of the silicon carbide powder, and then the high-frequency cut-off frequency of the sound production device is improved.

The present invention discloses a lattice sandwich structure with negative Poisson's ratio characteristics, anti-impact, and high energy absorption. The lattice sandwich structure is based on a high-performance negative Poisson's ratio lattice core material. The negative Poisson's ratio lattice core material is obtained by changing the angle between the struts and the coordinate axes of a three-dimensional cubic structure. When the angle between the struts and the coordinate axes is not equal to zero, a lattice material with negative Poisson's ratio characteristics is obtained. The negative Poisson's ratio lattice material and two thin plates together form a novel negative Poisson's ratio lattice sandwich structure, which will simultaneously possess the characteristics of traditional auxetic lattice structures and traditional lattice sandwich structures, that is, it not only has the characteristics of negative Poisson's ratio and co-directional curvature, but also has excellent mechanical properties such as ultra-lightweight, high specific modulus, high specific strength, anti-impact, and high energy absorption. The sandwich structure described in the present invention also has strong controllability. By adjusting the strut deflection angle and the relative density of the lattice material, the mechanical properties of the lattice sandwich structure described in the present invention can be adjusted within a large range. The lattice sandwich structure has great application prospects in the aerospace field.

The application discloses a gradient sequence titanium / aluminum isomer composite material and a preparation method thereof. The gradient sequence titanium / aluminum isomer composite material is obtained by compounding a gradient ordered titanium alloy lattice structure and an aluminum alloy. The gradient ordered titanium alloy lattice structure has holes with different sizes, and the holes are distributed in a gradient mode from small to large from inside to outside or from large to small from inside to outside. The aluminum alloy is filled in the holes of the gradient ordered titanium alloy lattice structure. The composite material has the characteristics of gradient ordered change of the base element soft and hard components, can inhibit local instability of plastic deformation of the components, and has the performance advantages of high strength, high specific strength and high specific modulus, so that the application field of the new type of lightweight high-strength titanium / aluminum composite structure material is expanded, and the composite structure material can be applied to the fields of aerospace, protective materials and rail transit and the like.

This invention discloses a method for preparing a high-strength, high-modulus carbon fiber ultrathin prepreg, comprising: spreading high-strength, high-modulus carbon fibers to obtain flat fiber bundles, then stacking and pressing them with a resin film placed above and below them; under the action of temperature and pressure, allowing the resin to fully impregnate the fiber bundles; and then cooling, coating, and winding. The high-strength, high-modulus carbon fiber is one of M40X, M55J, M60J, or higher grade carbon fibers, with a tensile modulus >377 GPa. This invention also discloses the high-strength, high-modulus carbon fiber ultrathin prepreg prepared by the above method and its applications. The spreading roller surface used in this invention is made of polytetrafluoroethylene, and the limiting roller surface is made of ceramic, solving the problems of easy fuzzing and fiber breakage of high-strength, high-modulus carbon fibers, and avoiding corrosion between carbon fibers and metals. The prepreg prepared by this invention has advantages such as high specific strength, high specific modulus, corrosion resistance, and stable structural dimensions, and has broad application prospects in aerospace and other fields.

To provide a substrate for magnetic recording media that has high heat resistance and specific modulus, and has low manufacturing costs. [Solution] The magnetic recording medium substrate according to this disclosure includes a steatite sintered body.

The invention provides a semiconductor module and a method for manufacturing the semiconductor module, which can alleviate stress repeatedly generated by thermal expansion / contraction, inhibit resin cracks and improve reliability. A semiconductor module (50) is provided with: a laminated substrate (5) on which a semiconductor element (1) is mounted via a bonding layer (25); a sealing resin (8) that seals a member to be sealed including the semiconductor element (1), the bonding layer (25), and the laminated substrate (5); and a low elastic modulus region (30) which is provided on the surface of the sealing resin (8) above the semiconductor element (1) and which has an elastic modulus lower than that of the sealing resin (8). If the storage modulus of the low-modulus region (30) when the storage modulus of the sealing resin (8) is 100% is defined as the specific modulus, the specific modulus is 0.83% or more and less than 100%.

A method for evaluating the structural bearing capacity of cement concrete panels relates to the field of road engineering technology. The evaluation method comprises the following steps: calculating the modulus ratio of a typical cement slab in a cement concrete road section to be tested, where the modulus ratio is the ratio of the current elastic modulus of the cement concrete surface layer to the initial elastic modulus; calculating the deflection basin area ratio of each cement slab in the cement concrete road section to be tested, where the deflection basin area ratio is the ratio of the current deflection basin area of ​​the cement concrete surface layer to the initial deflection basin area; establishing a correspondence between the deflection basin area ratio and the modulus ratio of the cement concrete surface layer of a typical cement slab; obtaining an estimated modulus ratio of other cement slabs in the road section through the corresponding relationship; and evaluating the structural bearing capacity of the cement concrete panel using the estimated modulus ratio as an evaluation indicator. The present invention can achieve rapid and comprehensive evaluation based on accurate judgment of the structural bearing capacity of the cement concrete panel, thereby improving the efficiency of evaluating the structural bearing capacity of the panels in the cement concrete road section.

The present invention provides a carbon-free, high-modulus, low-density lightweight structural steel plate and a preparation method thereof. The lightweight structural steel plate comprises the following components by weight: Mn: 10.0-16.0%, Al: 1.5-4.0%, Cr: 0.0-3.0%, Ti: 1.8-5.0%, B: 1.0-2.1%, Nb: 0.0-0.2%, with the remainder being Fe and impurities; wherein the Ti and B elements are added via an intermediate alloy, with the Ti weight content of Fe-Ti being 40% and the B weight content of Fe-B being 19%. The lightweight structural steel plate, a new type of low-density steel, achieves a physical property of 6.88-7.45 g / cm 3 The new steel achieves a low density while maintaining a high Young's modulus of 220-250 GPa, resulting in a high specific modulus. In terms of mechanical properties, the new steel boasts a yield strength increase of nearly 30-100% compared to conventional Fe-TiB2 steel while maintaining excellent ductility, meeting the demands of lightweight steel material development.

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 invention discloses a heat-resistant carbon fiber reinforced resin-based composite material and a preparation method thereof. The heat-resistant carbon fiber reinforced resin-based composite material comprises a high-temperature-resistant hybrid resin matrix, the carbon fiber reinforcement is dispersed in the high-temperature-resistant hybrid resin matrix and at least comprises a continuous fiber part and a chopped fiber part; the ceramic phase and the antioxidant filler are distributed in a preset area of the composite material; the high-temperature-resistant hybrid resin matrix provides intrinsic high thermal stability and matrix toughness for the material, the continuous fibers and the chopped fibers endow the material with high specific strength and high specific modulus, and meanwhile, crack propagation is effectively inhibited through toughening and bridging effects of the chopped fibers, so that the thermal stability of the material is improved, and the service life of the material is prolonged. The ceramic phase and the anti-oxidation filler preferentially form a compact and stable anti-oxidation protection layer, so that the extreme environment tolerance of key parts of the material is intensively enhanced on the premise of not excessively sacrificing the overall mechanical property of the material, and meanwhile, excellent mechanical property integrity, dimensional stability and long-time service reliability are kept.

A paper comprising polymeric fibers and polymeric binder, the polymeric fibers comprising a first polymer that is a copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, and the polymeric binder comprising a second polymer that is a copolymer having a structure derived from the reaction of para-oriented aromatic diamine monomer and benzimidazole monomer with a para-oriented aromatic diacid monomer, the paper having a density of 0.5 grams per cubic centimeter or less and an average specific modulus of 8500 Pa-m3 / g or higher.

The invention discloses a carbon fiber reinforced resin-based composite material for an unmanned aerial vehicle wing panel and a preparation method of the carbon fiber reinforced resin-based composite material, and belongs to the technical field of carbon fibers.The method comprises the steps that carbon fibers are prepared through electrostatic spinning in combination with a step-by-step pre-oxidation and carbonization technology; concentrated nitric acid and hydrogen peroxide are adopted for conducting composite acidizing treatment on the carbon fibers so as to increase surface active functional groups; a modifying agent prepared through the action of a specific amine substance and methyl methacrylate is used for cooperating with silane to conduct surface treatment on acidified carbon fibers, and a tough interface layer is constructed; and finally, carrying out mould pressing curing molding on the pretreated carbon fiber and the epoxy resin prepreg. Compared with the prior art, the obtained carbon fiber reinforced resin-based composite material is particularly suitable for unmanned aerial vehicle wings, has high specific strength, high specific modulus and excellent damp-heat aging resistance, and meets the harsh requirements of high-end equipment on light weight, high reliability and long service life of materials.

A high-magnesium glass fiber composition with high specific modulus and a glass fiber is provided. The glass fiber composition includes the following contents of components in percentage by mass: 58.5-63.0% of SiO2, 15.0-20.0% of Al2O3, 0.3-2.5% of CaO, 16.0-19.5% of MgO, 0.2-0.6% of Fe2O3, 1.0-3.5% of Y2O3 and B2O3, 0.1-1.0% of B2O3, and 0.3-0.8% of K2O and Na2O. The glass fiber composition has a density of less than 2.610 g / cm3, and the glass fiber has an elasticity modulus of equal to or greater than 94.0 GPa and a specific modulus of equal to or greater than 3.67*106 m.

The utility model provides a taper sleeve type carbon fiber roller. The taper sleeve type carbon fiber roller comprises a carbon fiber tube body, a shaft seat, a taper sleeve and a working layer, shaft seats are arranged at the two ends in the carbon fiber tube body, the shaft seats are combined with the carbon fiber tube body through fixing structures, and shaft holes are formed in the two shaft seats in a penetrating mode in the axis direction; a taper sleeve is arranged on the outer side of each shaft seat, a taper hole which is gradually narrowed from outside to inside is formed in each taper sleeve in the axis direction in a penetrating mode, and the axis of each taper hole coincides with the axis of the corresponding shaft hole. And the working layer is coated outside the carbon fiber pipe body. The carbon fiber roller has the advantages that the carbon fiber roller can be conveniently and independently disassembled and assembled, compared with an existing roller made of metal materials, the overall weight of the whole carbon fiber roller is lighter, energy consumption of the carbon fiber roller in the working process can be remarkably reduced, the carbon fiber roller is easier to disassemble and assemble due to the light weight, and the carbon fiber roller is convenient to disassemble and assemble. Meanwhile, higher specific strength and specific modulus are realized.

The invention relates to high-modulus steel and a preparation method thereof. The structure of the high-modulus steel comprises a ferrite matrix with the volume fraction being 86-88% and boronized particles with the volume fraction being 12-14%. The high-modulus steel has the characteristics of low density and high specific modulus, so that the requirements of steel for the fields of automobiles and the like with light weight and high rigidity requirements are met; according to the preparation method, by adopting a C-Cr-B component system and a high-temperature hot rolling-solution treatment mode process, the high-modulus steel with light boronized reinforced particles dispersed and distributed in a ferrite matrix is obtained; in the structure, boronized reinforced particles and a ferrite matrix form a coherent relationship, and the structure has strong binding capacity, so that the high modulus has good ductility and strength; and the high-temperature hot rolling process is adopted, continuous dynamic recrystallization can be achieved, stress concentration around boronized reinforced particles is restrained, the stress of the boronized reinforced particles and a ferrite matrix is evenly distributed, and therefore the machinability and the ductility of the high-modulus steel are improved.

The invention discloses a basalt fiber reinforced material for a wind power blade and a preparation method of the basalt fiber reinforced material, and belongs to the technical field of wind power blade materials. The basalt fiber reinforced material for the wind power blade is prepared from the following components in parts by weight: 90 to 94 parts of basalt fiber, 4 to 8 parts of sulfonated polyetheretherketone, 3 to 5 parts of modified hollow glass microspheres and 0.2 to 0.5 part of graphene oxide. According to the invention, a ternary synergistic multistage composite interface layer is constructed on the surface of the continuous basalt fiber, and low-density hollow microspheres and a high-modulus graphene oxide network are organically combined, so that the density of the interface layer is obviously reduced and the rigidity is synchronously improved; therefore, the specific modulus of the prepared basalt fiber reinforced material is improved, and the technical problem that traditional basalt fibers are high in density and difficult to meet the extremely lightweight design requirement of ultra-large wind power blade tips is effectively solved.

The invention provides a high-specific-modulus glass fiber composition, glass fiber and a composite material, and relates to the technical field of glass fiber, and the high-specific-modulus glass fiber composition is prepared from the following components in mole percent: 57.5 to 64.5 percent of SiO2, 10.0 to 15.0 percent of Al2O3, 6.0 to 10.0 percent of CaO, 18.0 to 23.0 percent of MgO, 0 to 1.0 percent of Li2O, 0 to 1.0 percent of K2O, 0 to 1.0 percent of Na2O, 0 to 1.0 percent of Fe2O3, 0 to 1.5 percent of TiO2, 0 to 1.0 percent of ZrO2, 0 to 0.5 percent of Y2O3 and 0 to 0.5 percent of La2O3. The quotient of the sum of the molar percentages of CaO and ZrO2 and the molar percentage of Y2O3 is not less than 17; the components and proportions are obtained through a prediction model and a multi-objective optimization model. The glass fiber composition provided by the scheme has high specific modulus and low crystallization upper limit temperature.

The utility model belongs to the technical field of electroacoustics, and particularly relates to a vibrating plate for a sound production device, a vibrating diaphragm assembly and a sound production device, the vibrating plate for the sound production device comprises a main body part, and the main body part is formed by mixing an aluminum alloy material and silicon carbide powder; the particle size D90 of the silicon carbide powder is between 0.1 mu m and 20 mu m, and the thickness of the main body part is between 5 mu m and 500 mu m. The vibration plate provided by the utility model has the advantages of high specific modulus, high yield strength and the like, thereby improving the high-frequency cut-off frequency of the sound production device.