47 results about "Specific modulus" patented technology

The invention relates to the technical field of composite materials, in particular to a high-strength elastic composite aerogel and a preparation method thereof.Negative Poisson ratio composite aerogel designed with a centripetal structure cooperating with a supramolecular system is prepared, the supramolecular system design is adopted, a hydrogen bond network of nanofibers serves as a weak interface bonding layer, and the elastic composite aerogel with the high strength is prepared. The fiber and the silane-based material interface are covalently interlocked to form a firm supramolecular system, and a centripetal structure is cooperated to realize a coupling effect between resistance and deformation. Through the cooperative strategy, the composite aerogel obtains excellent specific modulus and good recovery speed, and can be qualified for high-impact and high-strength application scenarios.

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.

The invention relates to a composite rudder sheet for an aircraft and a forming method of the composite rudder sheet, and belongs to the technical field of composites.The composite rudder sheet comprises a base layer, an upper structural layer, a lower structural layer and a metal piece; the matrix layer is made of chopped carbon fiber prepreg; the upper structural layer and the lower structural layer are both made of carbon fiber unidirectional belt prepreg; the metal piece is made of 7075 aluminum alloy or 7050 aluminum alloy; according to the technical scheme, the reinforcing material is obtained by combining the organic compound with the silanized composite material; combining the reinforcing material with diethanol amine to obtain a hyperbranched polymer; mixing the hyperbranched polymer with the composite epoxy resin, and then adding a curing agent to obtain modified epoxy resin; impregnating the short carbon fibers with the modified epoxy resin to obtain a short carbon fiber prepreg; impregnating the carbon fiber unidirectional belt with the modified epoxy resin to obtain a carbon fiber unidirectional belt prepreg; the specific strength and the specific modulus of the composite material ostrich section are improved on the whole, the overall weight of the composite material ostrich section is reduced, and the comprehensive performance of the composite material ostrich section is improved.

A housing of a sound generating device, the sound generating device and an electronic apparatus are provided. At least a part of the housing of the sound generating device is formed as a supporting part, at least a part of the supporting part is made of organic aerogel material, the organic aerogel material has a mesh structure on which reinforcement material is distributed, the reinforcement material accounts for 0 wt % to 40 wt % of the supporting part, and a specific modulus of the supporting part is 1.5 GPa·cm3 / g to 40 GPa·cm3 / g. At least part of the housing of the sound generating device is formed as the supporting part, the supporting part including organic aerogel material with a mesh structure and reinforcement material disposed on the mesh structure. Thus, the housing of the sound generating device has advantages of high strength, light weight and strong applicability.

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.

The invention relates to a water-oxygen-corrosion-resistant SiCf / SiC composite material containing multiple layers of substrates, which is a preparation method combining chemical vapor deposition with slurry impregnation and precursor impregnation cracking processes, and the substrates of the composite material are in layered distribution. The composite material comprises a CVI SiC layer, a high-entropy rare earth mono / bisilicate mixed matrix layer RE-Si-O layer, a PIP SiC layer, a beta-phase high-entropy rare earth bisilicate layer and a CVI SiC layer in sequence from inside to outside. In the matrix, the high-entropy rare earth silicate distributed in a layered manner can effectively prevent a water-oxygen corrosion atmosphere from corroding the interface phase of the composite material, the fiber and the PIP SiC matrix; the SiC matrix prepared by the CVI is high in purity and good in crystallinity, and uniformly and continuously coats the (4RE0.25) 2Si2O7 layer, so that the mechanical property of the composite material is ensured, and water-oxygen corrosion channels are reduced. The composite material not only has good high-temperature water oxygen corrosion resistance, but also has good obdurability due to the specific modulus difference layered matrix.

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%.

To provide a glass which can suppress deformation of a glass substrate such as warpage, is excellent in moldability, has low burden on a manufacturing facility, is low in a crystal growth rate, and is further excellent in productivity and quality.SOLUTION: An alkali-free glass contains BaO, with 50 to 80% of SiO2, 8 to 20% of Al2O3, 1.2 to 4% of B2O3, 1.7% or less of BaO, 0 to 0.2% of Li2O+Na2O+K2O, and 0 to 1% of P2O5, where [MgO] / [CaO] is more than 1.5, Young's modulus is 83 GPa or more, a strain point is 690°C or higher, a temperature T4 is 1,400°C or lower, a temperature T2 is 1,800°C or lower, an internal devitrification temperature is 1,320°C or lower, ηd is 104.4dPa s or more, ηc is 104.2dPa s or more, a crystal growth rate is 100 μm / hr or less, a density is 2.8 g / cm3 or less, a specific modulus is 31 or more, and an average thermal expansion coefficient is 30×10-7 / °C to 45×10-7 / °C.SELECTED DRAWING: None

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 provides a carbon-free high-modulus low-density light structural steel plate and a preparation method thereof. The light steel comprises the following components in percentage by weight: 10.0 to 16.0 percent of Mn, 1.5 to 4.0 percent of A1, 0.0 to 3.0 percent of Cr, 1.8 to 5.0 percent of Ti, 1.0 to 2.1 percent of B, 0.0 to 0.2 percent of Nb and the balance of Fe and impurities. Wherein Ti and B elements are added in an intermediate alloy mode, the weight content of Ti in Fe-Ti is 40%, the weight content of B in Fe-B is 19%, the steel plate is novel low-density steel, the low density of 6.88-7.45 g / cm < 3 > is achieved, meanwhile, the high Young modulus of 220-250 GPa is kept, and therefore the high specific modulus is generated. Compared with traditional Fe-TiB2 steel, the yield strength of the novel steel is improved by nearly 30-100% in the aspect of mechanical performance, meanwhile, good ductility is kept, and the development requirement of light-weight steel and iron materials is met.

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 belongs to the technical field of nonmetal surface metallization, and provides a resin-based composite cylindrical part and an inner surface metallization method thereof.The cylindrical part comprises a polymer extruded tube, the outer surface of the polymer extruded tube is wound with a resin-based fiber reinforced composite, and the inner surface of the polymer extruded tube is sprayed with metal powder. The method comprises the following steps: sleeving a polymer extruded tube on a core mold, and carrying out pretreatment such as surface roughening, plasma activation and adhesive coating on the outer surface of the polymer extruded tube; winding the resin-based fiber reinforced composite material on the pretreated polymer extruded tube, and removing the core mold to obtain a middleware; and metal powder is sprayed to the inner surface of the middleware in a cold spraying mode at the set preheating temperature and the set pressure, and the metalized resin-based composite material barrel-shaped part is obtained. On the premise that the structure of the cylindrical part is not obviously changed, it is guaranteed that the product has the advantages of being high in specific strength, high in specific modulus and the like, and meanwhile it is guaranteed that the inner surface of the cylindrical part has the good corrosion resistance, electric conduction and heat conduction capacity.