85results about How to "Improve layer performance" patented technology

A composite material of sandwich structure integrating loading, heat insulation and ablation and the manufacturing method are characterized in that an integrated pre-forming body is acquired by puncture and suture of the reinforcing material of a bearing layer, the reinforcing material of an ablating cover, and a heating insulation layer positioned between the two layers; an epoxy resin system and a phenolic resin system are injected simultaneously into a vacuum-pumped mould, in which the integrated forming body is pre-placed, by two sets of RTM injection systems respectively, then, the reinforcing materials of the bearing layer and the ablating layer are soaked by epoxy resin and phenolic resin respectively; and the composite material of sandwich structure integrating loading, heat insulation and ablation can be obtained by solidified molding after mould filling. The invention has the advantages that the composite material of sandwich structure integrating loading, heat insulation and ablation is put forward and can be integrally formed by one-time operation, the function of the interlayer between every layer of the composite material is enhanced greatly, the integrality is good; the stratifying and peeling of the composite can be reduced effectively, and the products have good designable property and can be widely applied to the structural parts of aerospace which need heating insulation and thermal protection.

The invention relates to a method for manufacturing a carbon fiber reinforced resin matrix composite structure, which comprises the following steps: (1) utilizing a pulling and extruding forming technique to prepare a micro-diameter carbon fiber rod with the diameter of 0.3mm-0.5mm; (2) using a numerical control embedded machine to implant the carbon fiber into a foam carrier according to a designed direction and distribution density; (3) guiding the micro-diameter carbon fiber rod from the foam carrier into a resin base composite material pre-soaking material blank by using an ultrasonic auxiliary implanting device, wherein the volume ratio of carbon fiber rod to resin base composite material is 0.44%-3.14%; and (4) after removing foams, co-curing the micro-diameter carbon fiber rod with a prepreg piece, so as to acquire a multi-directional enhanced resin base composite material co-curing component. By using the method, all sub-layers of the composite material having the layered structure are fixedly combined along the direction vertical to a paving layer. Compared with the composite material having no multi-directional enhanced layered structure, the interlayer fracture toughness of the multi-directional enhanced composite material having the layered structure is obviously increased, thereby improving the interlayer property.

The present invention relates to a cutting tool insert, solid end mill, or drill, comprising a substrate and a coating. The coating is composed of one or more layers of refractory compounds of which at least one layer comprises a h-Me1Me2X phase, where Me1 is one or several of the elements V, Cr, Nb, and Ta and Me2 is one or several of the elements Ti, Zr, Hf, Al, and Si and X is one or several of the elements N, C, O or B. The ratio R=(at-% X)/(at-% Me1+at-% Me2) of the h-MelMe2X phase is between 0.5 and 1.0, preferably between 0.8 and 1.0 and X contains less than 30 at-% of O+B. This invention is particularly useful in metal cutting applications where the chip thickness is small and the work material is hard e.g. copy milling using solid end mills, insert milling cutters or drilling of hardened steels.

The invention discloses an interlayer toughened composite material and a preparation method and an application thereof. The preparation method comprises the following steps that a reinforcing body isprovided, the reinforcing body comprises a plurality of first fiber aggregates which are stacked in the thickness direction of the reinforcing body, wherein the first fiber aggregates comprise a plurality of first fibers which are arranged in a specified direction in an orientation manner; at least one braided body is woven with the plurality of first fiber aggregates in the thickness direction ofthe reinforcing body to form the braided structure, wherein each braided body continuously penetrates between every two adjacent first fibers in two or more first fiber aggregates; the weaving structure is soaked in a fluid containing a curable resin material, then curing treatment is carried out, and the interlayer toughened composite material is formed. According to the composite material and the method and the application, the nano-carbon material strips and the like are adopted as the weaving body to weave the reinforcing body in the thickness direction, gaps are avoided between the reinforcing bodies due to the fact that the strips are added, so that a large stress concentration point does not exist in the composite material, and the interlayer toughening performance of the compositematerial is improved.

The invention relates to manufacturing method of vehicle components, as well as vehicle components and a vehicle. The method comprises the following steps of: a, layering continuous-filament woven fabric to obtain a layering structure (1); b, laying a resin film (2) at the bottom of the layering structure (1), and then performing pre-cutting to obtain a fibrous preform (3); and c, placing the fibrous preform (3) in an injection mold with an injection molding space (8), after mold clamping, injecting an injection molding material (6) containing discontinuous fibers and thermoplastic resin into the injection mold, so that the injection molding space (8) is full of the injection molding material (6) through injection molding and the fibrous preform (3) is infiltrated with the injection molding material (6), and performing pressure maintaining and forming so as to obtain the vehicle components (7). The method belongs to revolutionary innovation of a conventional low-pressure injection molding process. The manufactured components can meet the requirements of mechanical properties and formability at the same time. The problems of difficult forming by the conventional laminating process and low mechanical performance of the conventional injection molding process are solved.

The invention discloses a three-dimensional fabric laminated needled composite material and a preparation method thereof. The three-dimensional fabric laminated needled composite material is formed bycompounding a three-dimensional fabric laminated needled prefabricated body and a base material, wherein the three-dimensional fabric laminated needled prefabricated body is a three-dimensional structure material obtained by paving staple fiber felt between three-dimensional fabric layers and then utilizing a needling process. According to the composite material obtained by laminating and needling according to a specific process, the interlayer performance of the composite material is improved, the number of layers laid in the production process is reduced, the production efficiency is improved, the production period is shortened, the production cost is reduced, and the composite material is suitable for large-scale production and application.

The invention provides modified phenolic resin, a composite material, and preparation methods of the modified phenolic resin and the composite material. The modified phenolic resin comprises phenolicresin, chopped fibers, hollow microbeads and heat reflecting materials, and the hollow microbeads include hollow phenolic microbeads and hollow ceramic microbeads. The modified phenolic resin has theadvantages of non-ablative surface radiation and low thermal conduction, and ablative cracking heat desorption and mass ejection due to the special formula design; through blending of the hollow ceramic microbeads and inorganic masterbatches, the thermal insulation of the modified phenolic resin is enhanced, and the radiation resistance of the surfaces of ablative materials is improved.

The invention relates to an electron beam curing LOM forming method and device of thermosetting resin matrix composites. A composite prepreg tape coil is arranged on a coil release roller, and conveyed to a multipoint support plate through a conveyor device; a composite prepreg tape is cut by a laser emitter; the composites properly cut are transferred to a semi-finished part through a first manipulator, heated by an infrared heat lamp, hot-pressed by a press roller, and finally cured by low energy electron beam irradiation through a low energy electron beam emitter, so that the molding of a layer is finished; and the above steps are repeated till the molding of the required parts is finished. The electron beam cured thermosetting resin matrix adopted by the device is resistant to corrosion and high temperature, excellent in insulation and adhesive properties, and high in strength, and the LOM technology is high in forming speed, free of warping, and small in deformation with no need of support. According the method provided by the invention, the forming size is unlimited, and the selection of fiber bundle materials is wide; and the thermosetting resin matrix is excellent in performance, and the fiber directions can be arranged according to the design requirements.

The invention provides a discontinuous long fiber reinforced thermoplastic composite material mold pressing precast body and a preparation method thereof. The mold pressing precast body comprises slices formed by slitting/cutting of continuous fiber reinforced thermoplastic composite material preimpregnated sheets/preimpregnated yarns, wherein the length L range of the slices is 5-200 mm, the width W range of the slices is 2-30 mm, and the weight percentage content of fibers in the slices is 20-90 wt%; and high-strength isotropous complicated parts with high size stability can be prepared through secondary mold pressing of the precast body, so that the defects of easy warpup, fiber length loss, weaker part performances, anisotropic mechanical performances of continuous fiber reinforced composite materials and difficult machining of different-thickness complicated parts after mold pressing injection molding of short-fiber and long-fiber particles are made up.

The invention belongs to the technical field of materials, relates to the technical field of fiber reinforced composite materials, and particularly relates to a molding method of a unidirectional reinforced composite material with carbon nanotubes perpendicular to a fiber direction. The molding method comprises the working procedures of glue solution preparation, nanotube orientation, glue dipping, winding and molding. The orderly arrangement of the carbon nanotubes (CNTs) in a glue solution is realized by applying a direct-current electric field to the CNTs dispersed in resin, and a direct-current electric field is applied again between an extrusion roller and a drying chamber to perform secondary orientation on the CNTs dipped on the surface of fiber bundles, so that the orientation degree of the CNTs in the composite material is high, and the interlayer mechanical properties and the electrical conductivity are substantially improved. The molding method of the unidirectional reinforced composite material with the carbon nanotubes perpendicular to the fiber direction provided by the invention is easy to operate and control, low in requirements on equipment transformation, less in investment, quick in effect, widely applicable to winding systems with a semi-dry process, and especially applicable to the molding of unidirectional prepregs and composite materials thereof.

The invention provides a fiber composite material high-pressure hydrogen storage cylinder and a preparation method thereof. The preparation method comprises the steps that S100, a cylinder inner container is provided, and the cylinder inner container comprises an inner container body and a cylinder opening; S200, fiber yarns are adopted to conduct two-dimensional multi-spindle weaving on the outer surface of the cylinder inner container, so that a composite material weaving layer comprising multiple layers of fiber two-dimensional fabric is formed, the weaving angle of the fiber two-dimensional fabric at the position of the inner container body is 56-67 degrees, and the weaving angle of the fiber two-dimensional fabric at the position of the cylinder opening is 15-55 degrees; S300, in the composite material weaving layer, a sewing thread in the axis direction of the cylinder is additionally arranged between every 3-5 layers of adjacent fiber two-dimensional fabric for fixing, and a woven preformed body is obtained; and S400, resin is adopted to cure the woven preformed body through a vacuum bag vacuum resin infusion method, and the fiber composite material high-pressure hydrogen storage cylinder with the fiber composite material layer is obtained. The fiber composite material high-pressure hydrogen storage cylinder is light in weight, high in strength, resistant to fatigue, large in structural rigidity and good in high and low temperature impact resistance stability.

The invention belongs to the technical field of wave-absorbing materials and discloses a resin column reinforced broadband wave-absorbing/bearing composite material and a preparation method thereof. The preparation method comprises the steps of sequentially stacking an impedance matching layer playing a role in impedance gradual change, a wave-absorbing layer containing an absorbent and a reflecting layer are on a lower portion of a wave-transmitting layer to form a laminated structure, and punching through holes in the formed laminated structure, enabling resin to flow into the through holesby adopting a wet forming process, and forming resin column structures penetrating through the whole laminated structure at the positions of the through holes. According to the invention, the throughholes are punched in advance in the thickness direction of a multi-layer structure prefabricated body, the process characteristics of wet molding of the composite material are used, the resin is poured into the through holes in the prefabricated body filling process to form Z-direction resin column structures, the effect of enhancing the interlayer performance is achieved, the forming process is simple, the mechanical property is excellent, the interlayer performance is greatly enhanced through the resin column structures formed at the through holes, and the defect that a current wave-absorbing composite material wave-absorbing layer is easily layered can be effectively overcome.

The invention belongs to the technical field of preparation of graphene fiber materials and particularly relates to a preparing method for oriented graphene oxide fibers. The preparing method comprises the following steps that graphene oxide is prepared with lamellar graphene as a raw material, and a graphene oxide spinning solution is prepared; with a wet spinning method, the graphene oxide spinning solution flows into a solidifying solution, and primary graphene oxide fibers are prepared; at a certain temperature, the graphene oxide fibers are subjected to radial stretching and drying, and the oriented graphene oxide fibers are obtained. The preparing method is easy to implement and low in cost, the stretching rate of the fibers can be precisely controlled, and a good stretching effect can be achieved. The oriented graphene oxide fibers prepared through the method are significantly improved on the aspect of tensile strength compared with the primary graphene oxide fibers, a simple and effective method is provided for preparing high-performance fiber materials based on graphene, and the application of the graphene fibers in practical production and living can be promoted.

The invention provides an integral preparation method of a ceramic-based composite lattice structure. An integral forming mold for a composite lattice structure fiber preform is used to realize the simple preparation of the ceramic-based composite corrugated plate lattice structure, improve the interlayer performance and achieve a high profile dimension control precision, batch production and product net-forming. The prepared ceramic-based composite corrugated plate lattice structure has the advantages of good high temperature resistance, good oxidation resistance and good mechanical properties, can be reused, and is especially suitable for being applied to the high temperature (1000-1650 DEG C) oxidizing environment.

Disclosed are methods of manufacturing electronic devices, particularly integrated circuits. Such methods include the use of low dielectric constant material prepared by using a removable porogen material.

The invention discloses a fabric and a manufacturing method thereof, and a protection product. The manufacturing method for the fabric comprises: continuously parallelly spreading a plurality of ultra-high molecular weight polyethylene films or strips in sequence to form a single layer; continuously spreading a plurality of ultra-high molecular weight polyethylene films or strips in sequence on the formed single layer, to form another single layer; and repeating the step until N stacked single layers are formed, in the N single layers, at least two adjacent single layers intersecting and being in a certain angle, wherein the N is an integer larger than or equal to 2; and using binder yarns to pass through the upper parts and the lower parts of the N single layers to bind the N single layers to an integrated body. The fabric has good stretching, tensile, and shock resistance, and other properties. The protection product made based on the fabric has good bulletproof property.

The invention belongs to the technical field of functional composite materials, and particularly relates to a prepreg with an electromagnetic shielding function and a preparation method thereof. The preparation method includes the specific steps that a resin matrix, a flexibilizer and nanofiller are mixed to be uniform, then the mixture is compounded with a fiber layer and an electromagnetic shielding layer through a hot melting method preimpregnation process, and the electromagnetic shielding prepreg is obtained. The prepreg has the characteristics of excellent manufacturability, stable electromagnetic shielding performance, high shielding effect and good mechanical properties. An electromagnetic shielding composite material product prepared from the prepreg has the characteristics of reliable shielding effect and no process influence, and can be used for preparing a composite material product with an electromagnetic shielding function.

The invention discloses a continuous fiber reinforced thermal protection material and a preparation method thereof. The continuous fiber reinforced thermal protection material comprises an ablation-resistant area, a transition area and a thermal insulation area from surface to inside; the transition area and the thermal insulation area are formed by compounding and curing continuous fiber fabric and thermosetting resin; the ablation-resistant area is formed by compounding and curing a continuous fiber fabric and thermosetting resin and then impregnating with modified phenolic resin, the fiber volume fraction of the ablation-resistant area is greater than that of the transition area, and the fiber volume fraction of the transition area is greater than that of the thermal insulation area. The continuous fiber reinforced integrally-formed multifunctional thermal protection material provided by the invention has the excellent characteristics of light weight, surface ablation resistance, low internal heat conductivity coefficient, strong pyrolysis heat absorption, good surface heat protection effect and the like, and has a reusable application value in a thermal protection system of a hypersonic aircraft.

The invention relates to a preparation method for a cylinder of a nuclear magnetic resonance imager. The structural component of the cylinder comprises a main body (1) serving as a shell, wherein themain body (1) is of a cylindrical structure; a reinforcing ring (2) is arranged on the outer circumference of the main body (1); and a guide rail (3) is arranged on the inner surface of the main body(1) and is used for placing a bed board for a patient to lie down. The cylinder is characterized in that the main body (1) is made of an aramid honeycomb sandwich structure; the lower area of the guide rail (3) is removed, and a solid prepreg layer (4) is adopted in the lower area; the reinforcing ring (2) is laid on the outer side of the main body (1) through unidirectional prepreg; the main body(1) and the reinforcing ring (2) are integrally formed in a co-curing mode; and the guide rail (3) is formed by compression molding of glass fiber prepreg and then bonding epoxy resin with the main body (1). The cylinder adopts the aramid honeycomb sandwich structure, and the solid prepreg layer is locally designed, so the effects of reducing the weight of the cylinder and improving the production efficiency and safety are achieved, and the cylinder has more excellent heat insulation and sound insulation properties.