187 results about "Sic fiber" patented technology

The invention discloses a preparation method of a toughening environmental barrier coating, and relates to a preparation method of a coating. The invention aims to solve the problem of poor fracture toughness of the existing environmental barrier coating. The method comprises the following steps: 1, pretreating a base material; 2, preparing a bonding layer; and 3, preparing the environmental barrier layer. The high-melting-point metal silicide prepared on the surface of the base material or the bonding layer compounded by the high-melting-point metal silicide and the rare earth silicate has excellent temperature resistance and good interface bonding strength, and due to the addition of the rare earth silicate, the expansion coefficient of the bonding layer is highly matched with that of the base material; according to the prepared yttrium oxide stabilized zirconia fiber, mullite fiber or silicon carbide fiber reinforced rare earth silicate environmental barrier layer, the fracture toughness of pure Yb2SiO5 is improved to 6.5 MPa.m < 1 / 2 >-8.0 MPa.m < 1 / 2 > from about 1.85 MPa.m < 1 / 2 >. The strengthening and toughening environmental barrier coating prepared by the invention has very important significance on development of thermal protection coatings of hot end parts of aircrafts with high thrust-weight ratios in China.

The invention discloses a preparation method of a high-temperature-resistant wave-absorbing honeycomb sandwich structure in the technical field of wave-absorbing materials, which comprises the following steps: synthesizing a transition metal modified polycarbosilane precursor under the protection of inert gas, and performing high-temperature cracking to obtain a magnetic silicon carbide wave-absorbing agent; blending and grinding the wave-absorbing agent and high-temperature-resistant resin to prepare a wave-absorbing glue solution; after a honeycomb core material is formed by adopting inorganic fiber cloth, a wave-absorbing glue solution is loaded through a repeated dipping-drying process, and the high-temperature-resistant wave-absorbing honeycomb is obtained through gradient heat treatment. And finally, compounding and curing with the wave-transparent skin and the carbon fiber composite material through a high-temperature-resistant adhesive film. The sandwich structure is prepared on the basis of the composite material, and the magnetic silicon carbide wave-absorbing agent has the characteristics of high temperature resistance, low density, oxidation resistance and adjustable dielectric property; the phthalocyanine resin matrix is adopted, so that excellent formability and high-temperature stability are guaranteed; honeycomb nodes are sewn and reinforced by silicon carbide fibers, so that the problem of node cracking in a high-temperature environment is solved.

The invention relates to a modified silicon carbide fiber and a preparation method and application thereof, the modified silicon carbide fiber endows magnetic loss, and combines high strength and corrosion resistance of a geopolymer matrix to realize double improvement of mechanical properties and wave absorbing efficiency of concrete. Carbon fibers in conventional wave-absorbing concrete are replaced by modified silicon carbide fibers, so that on one hand, the wave-absorbing concrete has good oxidation resistance at high temperature, carbon emission is greatly reduced, and the wave-absorbing concrete has the advantages of energy conservation and environmental protection; and on the other hand, the defect that the performance is reduced at high temperature is overcome, and the modified silicon carbide fiber enables the magnetic loss of metal and the dielectric loss of a matrix to form a synergistic effect, so that the wave absorbing performance is greatly improved. The invention is suitable for green communication infrastructures, and has the characteristics of environmental protection, high durability and broadband wave absorption.

The utility model discloses a high-performance high-temperature-resistant oil-stain-resistant anti-interference medium-voltage power cable, and the power cable comprises a cable core which is formed by twisting a plurality of insulated shielding wire cores. A gap of the cable core is filled with thermoplastic polyurethane elastomer rubber; the cable core is wrapped by a superconducting silicon carbide fiber tape shielding wrapping layer, and the superconducting silicon carbide fiber tape shielding wrapping layer is wrapped by an LCP high-molecular liquid crystal polymer high-temperature-resistant fireproof layer in an extruded mode. A graphene aerogel layer is extruded outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer, a polysulfonamide fiber braid layer is lapped outside the graphene aerogel layer, a polyphenylene sulfide fiber tape is coated outside the polysulfonamide fiber braid layer through a semi-conductive adhesive, an armor layer is arranged outside the polyphenylene sulfide fiber tape, and the armor layer is wrapped outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer. And a hydrogenated butadiene-acrylonitrile rubber outer sheath is extruded outside the armor layer. According to the utility model, normal operation of a line can be ensured in a complex and severe environment for a long time, and the service life of the cable is greatly prolonged.

The invention provides a high-strength winding thin-wall SiC composite cladding tube and a preparation method thereof. A preparation method of a high-strength winding thin-wall SiC composite cladding tube comprises the steps that silicon carbide fibers are wound and laid around a core mold, the winding pre-tightening force is smaller than or equal to 10 N. The winding mode comprises the first mode that one layer of annular winding is conducted firstly, then one layer of spiral winding is conducted, and the number of fiber intersection points in the whole annular direction at a certain position of the outer surface of the core mold is 1. One-layer annular winding is carried out firstly, then two-layer spiral winding is carried out, the number of fiber intersection points in the whole annular direction at a certain position of the outer surface of the core mold is 3, and a prefabricated body is obtained; carrying out a densification deposition process on the preform, wherein the densification deposition process comprises PyC pyrolytic carbon interface deposition, CVI chemical vapor infiltration and CVD chemical vapor deposition; and precise inner circle and outer circle machining is conducted, and the SiC composite cladding pipe is obtained. According to the preparation method disclosed by the invention, through a specific dry winding mode and a densification deposition process, the SiC composite material tube blank is higher in density and better in mechanical property.

The invention relates to the technical field of thermal insulation materials, in particular to a high-temperature-resistant aerogel composite material and a preparation method thereof. The high-temperature-resistant aerogel composite material is prepared from the following components in parts by weight: 15 to 35 parts of reinforced fiber matrix, 43 to 65 parts of silicon-aluminum-zirconium ternary aerogel network, 3 to 12 parts of functional nano filler, 2 to 8 parts of zinc borate flame-retardant component and 0.5 to 2 parts of surface hydrophobic modified layer. Wherein the reinforced fiber matrix is composed of aluminum silicate fibers, silicon carbide fibers and aluminum oxide nanofibers; the molar ratio of silicon to aluminum to zirconium in the silicon-aluminum-zirconium ternary aerogel network is 5: 2: 1; the functional nanofiller comprises aluminum oxide nanoparticles, titanium oxide nanoparticles, carbon nanotubes and boron nitride nanosheets; the zinc borate flame-retardant component is zinc borate; the surface hydrophobic modification layer comprises an inner methyltrimethoxysilane modification layer and an outer hexamethyldisilazane modification layer. The high temperature resistance and thermal shock resistance of the material are remarkably improved, a low-energy-consumption preparation process is adopted, and the material has excellent comprehensive performance.

The invention relates to a structural wave-absorbing integrated ceramic-based composite material prepared based on 3D printing and a preparation method of the structural wave-absorbing integrated ceramic-based composite material. The preparation method of the structural wave-absorbing integrated ceramic matrix composite material comprises the following steps: mixing chopped silicon carbide fibers, a dispersant, a binder, a catalyst and a solvent to obtain chopped silicon carbide fiber slurry; the slurry is subjected to periodic array arrangement, printing and forming through 3D printing, and a silicon carbide fiber preform of a periodic structure is obtained through drying and glue discharging; inducing in-situ growth of the silicon carbide nanowire on the surface of the preform by using a catalyst introduced into the slurry by adopting CVI, and depositing a BN interface phase on the surface of the silicon carbide nanowire by adopting CVI to form a SiC / BN core-shell structure nanowire; dipping the prefabricated body into a polysilazane precursor, curing and cracking, and introducing a Si3N4 ceramic matrix into the prefabricated body; and repeating dipping, curing and cracking for 5-10 times to densify the composite material, thereby obtaining the structural wave-absorbing integrated ceramic matrix composite material.

The application provides a preparation method of a Si-based multi-component alloy bonding layer in an environmental barrier coating, and steps are as follows: S1, substrate preparation: taking SiC fiber reinforced SiC composite material as a substrate; S2, preparation of the Si-based multi-component alloy bonding layer: S21, the preparation process is carried out in a directional solidification crystal growth furnace, the furnace comprises a quartz glass tube, a graphite crucible and a heating device; S22, adding silicon material and X metal material into the graphite crucible; S23, fixing the substrate above the graphite crucible; S24, vacuumizing the quartz glass tube; S25, introducing cooling water, turning on the power supply, heating the graphite crucible through the heating device, until the silicon material and the X metal material in the graphite crucible are completely melted into Si-based alloy melt with fluidity; S26, immersing the pre-grown coating composite material substrate into the melt, and then gradually separating the substrate from the Si-based alloy melt through slow downward pulling of the graphite crucible, growing the Si-based alloy on the surface of the composite material uniformly, and preparing the Si-based multi-component alloy bonding layer.

The invention provides a ZrO2 (at) SiC (at) NiCo2O4 / NiO composite material with high temperature tolerance and a preparation method and application thereof, the composite material takes ZrO2 (at) SiC fibers as a three-dimensional conductive network framework, and NiCo2O4 / NiO nanosheets are anchored on the surfaces of the ZrO2 (at) SiC fibers. The composite material shows excellent electromagnetic wave absorption performance in a high-temperature environment.

The invention relates to the technical field of spaceflight protective clothing, and provides a spaceflight titanium alloy fiber composite protective clothing and a preparation method thereof.The preparation method comprises the steps that materials are pretreated, titanium alloy fibers are sequentially subjected to surface oil removal and acid pickling activation treatment, and then the titanium alloy fibers are immersed into a specific hydrothermal reaction solution to grow ceramic whisker reinforcements in situ; meanwhile, the TC4 titanium alloy powder, the SiC fibers, the Ni-Ti shape memory alloy microwires, the ZrO2-Y2O3 temperature-sensitive ceramic particles, the self-repairing microcapsules and the flexible graphene sensor array are subjected to pretreatment such as activation, annealing and dispersion. A three-dimensional interlocking microstructure is formed through in-situ growth of single crystal aluminum oxide whiskers on the surface of the titanium alloy fiber, the three-dimensional interlocking microstructure is cooperated with the shape memory fitting effect of SMA microwires and the thermal expansion matching effect of temperature-sensitive ceramic particles, the interlayer interface bonding strength is remarkably improved, the stable performance is maintained under an extreme temperature cycle, and the temperature-sensitive ceramic fiber composite material is prepared. And the layering defect of a traditional bonding process is thoroughly overcome.

This invention discloses a method for preparing silicon carbide fibers with an in-situ boron nitride coating. The method involves melt spinning a metal-doped polycarbosilane precursor to obtain doped polycarbosilane precursor fibers. These precursor fibers are then subjected to a non-melting treatment in an oxidizing atmosphere to obtain non-melting fibers. The non-melting fibers are then subjected to inorganic pyrolysis to obtain inorganic fibers. These inorganic fibers are then densified and sintered to obtain boron-containing SiC fibers. Finally, the boron-containing SiC fibers are subjected to high-temperature treatment in a nitrogen atmosphere to obtain silicon carbide fibers with an in-situ boron nitride coating. This invention provides a simple preparation method, resulting in an in-situ self-grown BN coating with high crystallinity, good stability, and excellent uniformity. The coating is tightly bonded to the SiC fibers, is low-cost, and can be mass-produced. Furthermore, it significantly improves the fiber's temperature resistance and high-temperature creep resistance, allowing the fiber to serve for extended periods at higher temperatures.

The invention relates to the technical field of refractory materials, in particular to an ultrahigh-temperature refractory material and a preparation method thereof. The ultrahigh-temperature refractory material comprises an ablation-resistant outer layer and an anti-oxidation inner layer, wherein the ablation-resistant outer layer is composed of a composite material containing a carbide ceramic matrix and first reinforced fibers; the carbide ceramic matrix is composed of a solid solution formed by the effect of five carbides of HfC, ZrC, TaC, NbC and TiC which are equal in mass; the first reinforcing fibers are chopped SiC fibers. According to the ultrahigh-temperature refractory material provided by the invention, the density of the ultrahigh-temperature refractory material is improved, and the comprehensive performance of the ultrahigh-temperature refractory material in the aspects of strength, toughness, oxidation resistance and the like is improved.

Nuclear fuel cladding for fast reactors, assemblies thereof, and methods of manufacture thereof are provided. The nuclear fuel cladding comprises a substrate, a first layer, and a second layer. The substrate comprises a tubular shape. The first layer is deposited over an external surface of the substrate. The first layer comprises a corrosion resistant composition. The second layer is disposed over the first layer. The second layer comprises silicon carbide fibers infiltrated with silicon carbide. The second layer is configured to inhibit outward creep of the substrate. A gap is defined intermediate the first layer and the second layer.

The invention relates to the field of ceramic-based composite materials, and discloses a CMC (Carboxy Methyl Cellulose) composite material component adopting a heterogeneous layering infiltration process and a preparation method thereof, aiming at complex-shaped components such as aero-engine hot end components, SiC fiber layering of a thicker ceramic coating with an interface layer and a protective layer is adopted in a smooth transition area or a high-temperature area of the component; therefore, the interface layer and the SiC fiber are protected in a CMC composite material component forming process or in a service environment; in a complex profile / curved surface region where only limited interface toughening and corrosion protection are required, and in a region where a relatively low stress level or temperature environment is provided, SiC fiber layup with only an interface layer or a thinner ceramic coating of an interface layer and a small-thickness protective layer is employed to provide weak interface bonding, such that the thickness of the interface layer is less than the thickness of the protective layer. Therefore, toughening mechanisms such as crack deflection and fiber pulling-out are realized. According to the method, the designability of the layering structure CMC can be fully exerted, and the CMC composite material can achieve cooperative improvement of the complex structure forming manufacturing performance and the service performance on the whole.

The present application relates to filter cotton technical field, specifically, it is a kind of high-temperature oven special heat-resistant filter cotton and its preparation process.It includes the following raw materials: polytetrafluoroethylene fiber, fluoroethylene carbonate, silicone resin, 2,2-dimethylol propionic acid, oil agent, pore-forming agent, adhesive and silicon carbide fiber.In the present application, under high-temperature oven working condition, polytetrafluoroethylene fiber melts and flows to wrap silicon carbide fiber to form "sheath-core" sealing structure, which can block the penetration of corrosive medium;fluoroethylene carbonate decomposition product reacts with the surface of silicon carbide fiber to form nanocomposite layer, its micro-nano level rough interface can induce airflow turbulence, and micropore can prolong airflow path, further improve the diffusion capture efficiency of submicron particles, so that filter cotton can still maintain high interlaminar peeling strength after thermal cycling under high-temperature oven working condition, thereby ensuring the premise of filtration performance to improve the high-temperature resistance of filter cotton.

Ultrafast Joule heating synthesis methods and systems, and more particularly, ultrafast flash Joule heating upcycling of fiber reinforced plastics (such as waste fiber reinforced plastics, glass fiber reinforced plastics, carbon fiber reinforced plastics, and / or quartz fiber reinforced plastics) and materials including fiber reinforced plastics (such as reinforced metal laminates including glass reinforced aluminum laminates and other glass reinforced metal laminates) to phase-controllable silicon carbide (SiC). Further, ultrafast Joule heating synthesis methods and systems for synthesis include SiC fibers / fibrils (such as SiC nanowires), SiC nanowires, and SiC-containing polymer composites, as well as B4C nanowires.

To provide a method for efficiently producing a high-quality SiC fiber.SOLUTION: SiC fibers having a tensile strength of 0GPa or more are heated by microwaves (MW). A method for producing SiC fibers by MicrowaveHeating (MWheating). A silicon-carbide (SiC) fiber having a tensile modulus of elasticity of 300GPa or less is microwave-heated (MW-heated. A method for producing SiC fibers by MicrowaveHeating (MWheating). PolyCarboSilane (PCS) fibers were subjected to microwave heating (MW heating. A method for producing SiC fibers by MicrowaveHeating (MWheating).SELECTED DRAWING: Figure 1

A method of making a ceramic matrix composite includes infiltrating a fiber preform comprising silicon carbide fibers with a slurry comprising a liquid, silicon carbide particles, carbon particles, and silicon particles to form a slurry-infiltrated fiber preform. The slurry-infiltrated fiber preform is infiltrated with a molten material comprising silicon. Prior to or during the infiltration with the molten material, the silicon particles are melted. The molten material is cooled, and a ceramic matrix composite including a ceramic matrix reinforced with the silicon carbide fibers is formed, where the ceramic matrix is substantially devoid of dry slurry defects.

The invention belongs to the technical field of metal matrix composite material preparation, and particularly relates to a preparation method of a SiC fiber reinforced titanium alloy composite material precursor ribbon. The SiC fiber reinforced titanium alloy composite material precursor ribbon is prepared by ultrasonic welding, and the preparation of a high-density, high-strength and high-dimensional-precision strip is realized by solid metallurgical bonding of densely arranged precursor filaments and a titanium alloy foil tape with the same material or similar components. The method breaks through the technical bottleneck of a traditional binder process, does not need a degumming procedure, can effectively improve the performance quality and preparation efficiency of the precursor ribbon, is high in precursor ribbon efficiency, high in density, excellent in strength and controllable in size, solves the technical problems of tedious procedures, long preparation period, high porosity, weak interface bonding and the like in the traditional process, and is suitable for industrial production. And a new way is provided for process preparation of the high-performance metal-based composite material structural part.

This invention relates to a silicon carbide ceramic matrix composite material reinforced with unidirectional silicon carbide fibers and its preparation method, comprising: 1) winding silicon carbide fibers in the same direction to obtain a unidirectional tape; 2) depositing an interface phase on the surface of a single fiber using chemical vapor deposition; 3) preparing a prepreg slurry by mixing carbon powder, dispersant, etc.; 4) impregnating the unidirectional tape with the slurry to obtain a prepreg tape; 5) layering the prepreg tape and the unimpregnated unidirectional tape at a layer ratio of 1:1 to 16:1 and a silicon carbide fiber angle of 0° to 90°; 6) obtaining the composite material through curing, pyrolysis, and melt infiltration densification. This invention breaks away from the traditional single-layer layup mode, constructing a continuous gas flow path through mixed layering, guiding process gas generation, solving the drawbacks of high porosity and matrix cracking, optimizing the material's stress state, and obtaining a composite material with both low density and high compactness, excellent mechanical properties at room temperature and high temperature, and excellent oxidation stability, shortening the preparation cycle, and meeting extreme service requirements.

A method of forming a ceramic matrix composite includes arranging a plurality of fibers into a preform, each of the plurality of fibers being formed from silicon carbide, depositing a nucleating layer on the plurality of fibers, the nucleating layer comprising a crystalline material having an a-lattice constant and a c-lattice constant, and depositing a boron nitride layer on the nucleating layer. The c-lattice constant of the crystalline material of the nucleating layer corresponds to an a-lattice constant of the silicon carbide, such that the c-lattice constant of the crystalline material is within 3.0% of the a-lattice constant of the silicon carbide.

The invention discloses a 1500 DEG C-resistant ceramic-based composite material and a preparation method thereof, and belongs to the technical field of high-temperature structural materials. The method comprises the following steps: selecting metal-doped high-temperature-resistant silicon carbide fibers to form a preform; depositing a Ti3SiC2 interface layer on the surface of the fiber, and carrying out heat treatment at 1200-1500 DEG C; and then sequentially carrying out chemical vapor deposition on a SiC matrix, dipping ceramic powder with slurry and dipping and pyrolyzing a metal modified precursor on the prefabricated body to obtain the final composite material. The composite material comprises a preform formed by the SA type fiber, a Ti3SiC2 interface layer covering the surface of the fiber, and a composite matrix filling and coating the fiber. Through the systematic design of the high-temperature-resistant fibers, the reinforced interface and the synergistic densification matrix, the prepared material has excellent mechanical properties and long-term stability in air at the temperature of 1500 DEG C, and is suitable for ultrahigh-temperature hot-end components such as aero-engines and gas turbines.

The application discloses a kind of based on stirring ceramic fiber reinforced aluminum matrix composite and preparation method thereof, belong to composite material technical field.The composite preparation method is: aluminum alloy is heated under stirring state and is fully fused, remove surface oxide film, then add the ceramic fiber silk of pretreatment, improve stirring speed and fully mix, then cast forming, namely obtained;The mass ratio of aluminum alloy and ceramic fiber silk is 4~7:1;The ceramic fiber silk is one of pure ceramic fiber and aluminum base ceramic composite fiber.The method not only greatly improves the dispersivity of fiber reinforced phase, but also greatly improves the infiltration of aluminum alloy matrix to ceramic fiber, effectively improves two-phase interface, so as to significantly improve the mechanical properties of composite material, by testing, with ZL102 aluminum alloy as base material, aluminum base silicon carbide fiber as ceramic fiber reinforced phase, its tensile strength can reach 709MPa, compared with ordinary ZL102 aluminum alloy, it is increased by 443%.

A method for producing a polycarbosilane (PCS) for silicon carbide fibers, the method does not include adjusting a molecular weight of PCS, the method comprises the steps of: (a) heating a composition containing a cyclic silane compound in a liquid-phase reaction vessel 1 to vaporize the composition; (b) heating the composition in gaseous form obtained by the step (a) to produce a PCS; and (c) returning the PCS produced by the step (b) to the liquid-phase reaction vessel 1, and returning gaseous components having cooled to the liquid-phase reaction vessel 1. Each of the steps is repeated, thereby producing a PCS having a number average molecular weight (Mn) of 1250 or more and less than 6000 and a ratio (Mw / Mn) of a weight average molecular weight (Mw) to the number average molecular weight (Mn) of 4.5 or more and 20.0 or less.

The application discloses a kind of silicon carbide fiber bundle liquid phase suspension impregnation device and its interface layer preparation method, belong to ceramic matrix composite interface engineering field.Device includes unwinding mechanism, mechanical pre-twist mechanism, liquid phase impregnation tank, ultrasonic suspension dispersion system, guide assembly, drying unit and winding mechanism.Method by mechanical pre-twist will fiber bundle preliminary flatten into flat strip, again introduced liquid phase impregnation tank, under the action of ultrasonic field make fiber monofilament in liquid contactless suspension state, realize the uniform adsorption and deposition of interface layer precursor.The application utilizes the acoustic streaming field generated by ultrasonic wave in liquid to make fiber monofilament "suspended" in liquid, completely avoid the hard contact damage of fiber and mechanical parts, and solve the problem of uneven impregnation of each monofilament in fiber bundle.The thickness variation coefficient of interface layer obtained by the application is ≤5%, and the fiber strength retention rate is ≥95%, which is suitable for continuous and high-quality preparation of various interface layers such as carbon, BN, SiC and oxide on the surface of silicon carbide fiber.

The invention discloses a method for manufacturing an oxygen blowing rubber tube of an oxygen lance of a steelmaking converter in the field of special rubber products for metallurgical industry. A Cer-SiR composite material is adopted to prepare the single-layer rubber tube, and the composite material is prepared through a four-step method including the steps that firstly, silicon dioxide nanospheres and silicon carbide fibers are subjected to surface synergistic modification, and multi-interface bonding is formed; constructing a gradient cross-linked network to improve the mechanical property; then depositing a low-temperature ceramic modified layer to enhance high-temperature stability; and finally, interface bonding is strengthened through post-vulcanization. The rubber tube is manufactured by adopting precise extrusion molding, gradient vulcanization shaping and surface strengthening processes, and comprises the strengthening steps of vacuum drying, melt filtering, blending modification, temperature, rotating speed and cooling speed control during extrusion, cross-linked structure optimization through segmented heating during vulcanization, final port treatment, surface spraying and the like. The rubber tube prepared by the method is resistant to high temperature, oxidation and wear, the service life is effectively prolonged, and the high-efficiency and low-cost production requirements of a steelmaking converter are met.

This invention discloses an inorganic stone with a granite-like texture and its preparation method, belonging to the field of building materials technology. The modified reinforcing fibers of this invention have higher surface active sites, effectively enhancing the interfacial bonding force between the modified reinforcing fibers and the inorganic matrix. By compounding polyvinyl alcohol fibers, silicon carbide fibers, and basalt fibers of different grades, a multi-layered, multi-dimensional spatial network structure is constructed in the matrix, working synergistically to achieve significant reinforcement. This invention uses butylated hydroxytoluene and nano-titanium dioxide to modify styrene-butadiene emulsion, improving the compatibility of the modified styrene-butadiene emulsion with inorganic hydration products. The organic-inorganic interpenetrating network structure formed after curing further enhances the toughness and impermeability of the inorganic stone. Overall, it yields a dense, smooth, low-water-absorption, high-gloss, and mechanically excellent granite-like inorganic stone, meeting the requirements for high-performance environmentally friendly imitation stone materials.

The utility model belongs to the technical field of composite materials, and particularly relates to a fiber composite material structure which comprises a carbon fiber base plate, composite material layers are arranged on the upper side and the lower side of the carbon fiber base plate respectively, and woven connecting layers are arranged on the sides, close to the carbon fiber base plate, of the two composite material layers respectively. And first rectangular grooves are formed in the upper surface and the lower surface of the carbon fiber substrate. According to the fiber composite material structure, the piston-shaped rubber base plate plays a role in effectively damping and buffering pressure and impact force, and the connecting ball, the elastic rubber strip, the stabilizing sleeve and the stabilizing rod are arranged to play a role in reciprocating buffering action when the silicon carbide fiber bundle is pressed; and the effect of effectively counteracting the pressure and the impact force is achieved through the reciprocating buffering action of the elastic structure, so that the effect of improving the protection quality is achieved by effectively buffering and counteracting the pressure and the impact force.

The invention relates to the technical field of structural materials for aviation, and particularly provides a forming method of a SiC / SiC composite flame tube of an aero-engine. The invention provides a forming method of an aero-engine SiC / SiC composite material flame tube. The forming method comprises the following steps: S1, weaving silicon carbide fibers into a fiber preform; placing the fiber preform in a forming die, and carrying out die-filling and shaping treatment; s2, carrying out heat treatment on the fiber preform treated in the step S1, and then forming an interface layer on the surface of the fiber preform by adopting a chemical vapor infiltration process; s3, forming a SiC matrix layer on the surface of the fiber preform treated in the step S2 by adopting a chemical vapor infiltration process; and then densification treatment is carried out by adopting a precursor impregnation and pyrolysis process, and the flame tube is obtained. According to the variable-curvature rotary body structure characteristics of the flame tube, an adaptive fiber preform weaving mode and a densification forming mold are designed, and forming is performed by adopting a CVI + PIP combined process, so that the shape and size precision of the flame tube is effectively ensured.

The invention belongs to the technical field of ceramic fibers, and discloses a method for rapidly synthesizing silicon carbide fibers. The method comprises the following steps: carrying out oxidation treatment on active carbon fibers to obtain oxidized carbon fibers; preparing zirconium disilicide steam, and enabling the oxidized carbon fiber to adsorb the zirconium disilicide steam; after adsorption is finished, high-temperature sintering is carried out under a silicon source, and the silicon carbide fiber is prepared. According to the method provided by the invention, the synthesis temperature of the silicon carbide fiber can be effectively reduced from the traditional 1400-1600 DEG C to 1150-1350 DEG C; and the synthesis period of the silicon carbide fiber can be shortened to 1-5 hours from 6-10 hours in the prior art, so that the production efficiency is improved, and the production cost is reduced. The method provided by the invention is high in process compatibility and suitable for industrial continuous production.