148 results about "Fiber carbon" patented technology

The invention discloses high-strength concrete and a preparation method thereof in the field of concrete. The high-strength concrete is prepared from the following raw materials in parts by weight: superfine sulphoaluminate cement; coarse aggregate; quartz sand; silica fume; coal ash; nano metakaolin; silicon carbide whiskers; a graphene oxide; a pH responsive microcapsule; coating the steel fibers with liquid metal; a carbon nanotube; and a polycarboxylic acid water reducer. Release of the repairing agent is accurately regulated and controlled by adopting the pH response microcapsule, the interface performance is enhanced by combining with the liquid metal coating steel fiber, and the composite dispersion process of the nano material is optimized. Wherein the environment response efficiency of the microcapsule is remarkably improved through the collaborative design of a calcium oxide-slow release agent system and a methyl methacrylate / acrylic acid copolymerization shell layer; according to the gallium-based liquid metal coating, metallurgical bonding of fibers and a matrix is achieved through the low-melting-point characteristic, and traditional physical bonding limitation is broken through.

The invention discloses a unidirectional graphene fiber carbon / carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of carbon / carbon composite materials. The preparation method comprises the following steps: adding phenolic resin powder into absolute ethyl alcohol to prepare a phenolic resin dipping solution; adding the graphene fiber bundle into a phenolic resin impregnation solution for impregnation under the conditions of normal temperature and normal pressure to prepare a pre-impregnated graphene fiber bundle; carrying out stepped heating curing on the pre-impregnated graphene fiber bundle, and then carrying out carbonization to prepare a pre-treated graphene fiber bundle; the pretreated graphene fiber bundles are arranged in parallel and stacked in the thickness direction, pressure is applied for fastening, and a one-way prefabricated body is obtained; and carrying out heat treatment on the unidirectional preform, densifying by adopting an isothermal chemical vapor infiltration process, and then carrying out graphitization treatment to obtain the unidirectional graphene fiber carbon / carbon composite material. The graphene fiber is pretreated to fill pores of the graphene fiber, so that the densification efficiency of the graphene fiber preform is improved, and finally, the heat conduction and mechanical properties of the composite material are enhanced.

The invention discloses a carbon fiber sizing agent composition suitable for thermoplastic resin, sized carbon fiber, a carbon fiber sizing agent as well as a preparation method and application of the carbon fiber sizing agent, belongs to the technical field of carbon fiber sizing agents, and solves the problem that a sizing agent in the prior art cannot meet excellent mechanical properties and high temperature resistance at the same time. The composition is prepared from the following components in parts by weight: 15 to 35 parts of modified polyaryletherketone resin matrix, 0.3 to 2 parts of neutralizer, 1 to 3 parts of emulsifier, 1.5 to 3 parts of defoaming agent and 57 to 80 parts of deionized water. The sizing agent containing the composition has good wettability and film-forming property on the surface of the carbon fiber, and meanwhile, the sizing agent is matched with other components with specific contents in the composition, so that the carbon fiber sizing agent containing the carbon fiber sizing agent composition has excellent heat resistance, can bear processing at the high temperature of 350 DEG C or above, and has good application prospects. And the composite material containing the sizing agent has excellent interlaminar shear strength.

The invention discloses a carbon nanotube hollow fiber-based electrode and a preparation method and application thereof, the carbon nanotube hollow fiber-based electrode comprises a conductive substrate and an active material loaded on the conductive substrate, the conductive substrate is a carbon nanotube hollow fiber, the inner diameter of the carbon nanotube hollow fiber is 130-310 [mu] m, and the wall thickness of the carbon nanotube hollow fiber is 5-10 [mu] m. The carbon nanotube hollow fiber is used as a conductive substrate, and a stable conductive network structure is formed among the carbon nanotubes, so that the substrate has excellent conductivity, is beneficial to rapid transfer of charges between an electrode and an electrolyte, also has a high specific surface area, and provides more active sites for charge storage; the carbon nanotube hollow fiber is subjected to surface treatment, and oxygen-containing functional groups such as hydroxyl and carboxyl are introduced, so that hydroxide uniformly and orderly grows on the surface of the hollow fiber, a nanowire array structure is formed, a multi-channel diffusion path is provided, and ion diffusion is facilitated; and the prepared carbon nanotube hollow fiber-based electrode has high specific capacitance and excellent rate capability.

The invention provides a micro-miniature semi-tilting unmanned aerial vehicle and a control method thereof.The unmanned aerial vehicle comprises a main body structure, a coaxial double-paddle system, a tilting double-rotor system, a full-motion control surface assembly, a flight control system and a power supply assembly; the main body structure is composed of a carbon fiber carbon plate, a carbon tube and a 3D printing photosensitive resin part, and light weight and rigid supporting are achieved; the coaxial double-propeller system provides main lift force and counteracts reverse torsional moment; the double-rotor system is tilted, and a lift force / thrust mode is switched; the pneumatic efficiency of the tilting rotor wing is improved by the full-motion control surface assembly; the control method comprises a low-speed mode and a high-speed forward flight mode, the vertical take-off and landing, hovering and high-speed cruising are integrated, the structure is simplified, the stability is improved, and the cost is low.

The present invention provides an automotive wiring harness tape and a preparation method thereof. The wiring harness tape consists of a shielding layer and a rubber coating layer. The shielding layer is prepared from materials such as polyester fiber, nylon fiber, glass fiber, carbon fiber and conductive composite fiber, and has excellent electromagnetic shielding capabilities. The rubber coating layer is formed by mixing an antioxidant, a light stabilizer and silicone rubber, which effectively reduces the VOC release of the tape while ensuring good aging resistance and mechanical properties. The preparation method includes the steps of fiber mixing, heat setting treatment, rubber coating layer preparation and cutting. By precisely controlling the proportion of each component and process parameters, the continuity and stability of the tape are ensured. The automotive wiring harness tape of the present invention not only has excellent electromagnetic shielding performance, but also has good low fogging and mechanical properties, and is suitable for complex automotive electromagnetic environments.

The invention relates to the technical field of brake pads, in particular to a brake pad adaptive to a carbon-ceramic brake disc and a preparation process thereof.The brake pad comprises, by weight, 25%-57% of reinforced fibers, 22%-49% of a lubricant, 7%-17% of a binder, 7.2%-28.1% of a friction modifier and 3%-23% of filler; the reinforced fiber is at least one of nano silicon nitride modified ceramic fiber, carbon fiber and aramid fiber. Through cooperation of the components, the prepared brake pad has the advantages of being good in heat conduction, resistant to shearing and abrasion, good in toughness, capable of reducing noise, stable in friction coefficient, reliable at low temperature, high in high-temperature braking force, stable in braking and the like.

The invention provides a Joule thermally driven CO2 rapid desorption method based on a hollow fiber carbon film. The conductive hollow fiber carbon film is used as a reactor; the method comprises the following steps: pumping an absorption solution of saturated CO2 into a tube pass of a membrane reactor, simultaneously applying voltage to a component to generate Joule heat, vacuumizing a shell side of the component, separating desorbed carbon dioxide and barren liquor through a gas-liquid separation tank, and then collecting the desorbed carbon dioxide and barren liquor. The problems of high energy consumption and slow desorption of a traditional process are solved, the energy consumption-rate mutual exclusion dilemma in the amine solution regeneration process is overcome, the phenomena of amine degradation and equipment corrosion are relieved, and the dynamic response speed and comprehensive performance of a desorption system are improved.

The invention provides carbon paper for a fuel cell, a preparation method of the carbon paper and the fuel cell, and the preparation method of the carbon paper for the fuel cell comprises the following steps: providing a polytetrafluoroethylene film, and preparing slurry which comprises graphitized carbon fibers, carbon nanotubes, polytetrafluoroethylene emulsion, phenolic resin dry powder, ethylene glycol, deionized water and triton; coining the slurry on the polytetrafluoroethylene film by using the polytetrafluoroethylene film as a substrate and adopting a silk-screen printing process to prepare a carbon paper blank; putting the carbon paper blank into a drying oven for curing, and stripping the polytetrafluoroethylene film in the cured carbon paper blank to obtain initial carbon paper; and putting the initial carbon paper into a drying oven, and sequentially carrying out carbonization treatment and graphitization treatment under atmosphere protection to prepare the carbon paper. The method is simple in process, controllable in cost and easy for large-scale production, and the prepared carbon paper has good porosity, high transverse conductivity and high transverse gas permeability.

The invention relates to a method for preparing carbon paper by blending PVA fibers and carbon fibers into a net, and relates to the technical field of carbon paper preparation, and the method comprises the following steps: (1) respectively opening carbon fibers and water-soluble polyvinyl alcohol fibers, mixing the two fibers in proportion, carding, lapping and reinforcing to prepare a preform with the gram weight range of 60-270g / m < 2 >; (2) reducing the preform with hot water to remove polyvinyl alcohol fibers, and then drying to obtain a uniform carbon paper preform with the gram weight of 10-180g / m < 2 >; (3) impregnating the carbon paper preform in resin, drying, and performing hot press molding to obtain a carbon paper base material; and (4) performing low-temperature carbonization and high-temperature graphitization treatment on the carbon paper base material in an oxygen-free environment to obtain a carbon paper finished product. The carbon fiber web forming method has the advantages that the carbon fiber web forming difficulty is reduced, meanwhile, continuous and stable carbon web forming can be achieved, and then continuous carbon paper can be rapidly prepared.

The invention relates to the technical field of aluminum alloy composite materials, in particular to a preparation method of a SiC fiber reinforced aluminum matrix composite material with high compressive strength. A SiCf / 2024Al precursor wire is used as a core material, the SiCf / 2024Al precursor wire is loaded into a 2024Al alloy sheath, sheath packaging, hot isostatic pressing, multi-stage heat treatment and the like are carried out, the high-performance SiCf / 2024Al composite material is prepared, the SiC fiber reinforced aluminum-based composite material is composed of SiC fibers, a carbon layer, a 2024Al alloy matrix and the 2024Al alloy sheath in sequence, the obtained composite material matrix is uniform in grain size and morphology, and the size of the composite material is larger than that of the 2024Al alloy sheath. And large-size second phase segregation is avoided. According to the preparation method, the composite material is processed and formed by coating fibers on the matrix and adopting a hot isostatic technology, and then the matrix and the sheath are subjected to strong plasticity regulation and control through a multi-stage heat treatment system, so that the room-temperature compressive strength of the finally obtained SiCf / 2024Al composite material is 3,500 MPa or above.

The present invention belongs to the field of photocatalytic degradation of polluted wastewater and relates to a method for preparing a multi-scale titanium dioxide fiber / carbon nanotube film composite photocatalyst. The method comprises the following steps: while drawing a carbon nanotube array, preparing TiO2 fibers on its surface by microemulsion electrospinning to obtain the multi-scale TiO2 fiber / carbon nanotube film. The multi-scale TiO2 fiber / carbon nanotube film provided by the present invention not only solves the problem of poor mechanical properties of carbon nanotube (CNTs) membranes prepared by methods such as filtration by drawing multi-walled carbon nanotubes (MWCNTs), but also overcomes the problems of TiO2 fibers being brittle and difficult to recycle by loading TiO2 fibers on the CNTs membrane. In addition, the method of preparing TiO2 fibers by electrospinning replaces the method of depositing TiO2 particles on the CNTs membrane, solving the problems of easy shedding of TiO2 particles, high preparation cost, and complex process.

The invention belongs to the technical field of preparation of electromagnetic wave-absorbing and heat-insulating materials, and discloses a composite wave-absorbing and heat-insulating material and a preparation method and application thereof.The preparation method comprises the steps that coconut fiber carbon aerogel is prepared, then C / SiC nanowire composite aerogel is prepared from the coconut fiber carbon aerogel and silicon dioxide dry gel powder, the pretreated C / SiC nanowire composite aerogel is soaked in a ZIF-8 precursor solution, and the ZIF-8 precursor solution is dried to obtain the composite wave-absorbing and heat-insulating material. The composite wave-absorbing and heat-insulating material with specific orientation arrangement is obtained. The prepared composite material has a three-dimensional connected network structure arranged in a specific orientation mode, is high in wave absorbing performance, wide in absorption frequency band, good in heat insulation performance and low in density, can effectively absorb electromagnetic waves of different wave bands by adjusting the ZIF-8 loading capacity, and has important application value in the fields of electromagnetic wave absorbing, high-temperature heat insulation and the like.

The invention discloses an ultrahigh-temperature graphitization furnace for carbon fiber carbonization production, and belongs to the technical field of material science and engineering, the ultrahigh-temperature graphitization furnace comprises an equipment main body, the equipment main body comprises an outer shell, a plurality of partition plates, a heating body, a furnace tube and an air inlet pipe, the outer shell forms a plurality of temperature zones, the furnace tube is horizontally mounted in the outer shell, the heating body is attached to the furnace tube, and the air inlet pipe is connected with the heating body. The furnace tube has a chute; the carbon cleaning assembly comprises a fan-shaped plate and an ash scraping plate, and the fan-shaped plate is provided with a pay-off groove; by arranging the carbon cleaning assembly, carbon deposition is formed on the inner wall of the furnace tube along with the increase of the service time of the furnace tube; a worker pushes the fan-shaped plates back and forth through the wire inlet and the wire outlet, so that the sliding columns slide in the sliding grooves, the sliding fan-shaped plates drive the ash scraping plates to slide back and forth in the axial direction of the furnace tube, then deposited carbon in the furnace tube is scraped off, cleaning by the worker is facilitated, the situation that precursors are polluted by the deposited carbon and the purity and performance of the precursors are affected is prevented, and the final product quality is improved.

The application relates to the technical field of lithium battery cartridge manufacturing, and particularly discloses a short-fiber carbon fiber reinforced carbon-carbon cartridge and a preparation method thereof. The short-fiber carbon fiber reinforced carbon-carbon cartridge comprises the following raw materials in parts by weight: 15-45 parts of chopped carbon fibers, 38-63 parts of carbon powder or graphite powder, 10-40 parts of resin, 10-20 parts of coal tar pitch and 10-30 parts of fillers. The preparation method of the short-fiber carbon fiber reinforced carbon-carbon cartridge comprises the following steps: S1, stirring and mixing raw materials to obtain a mixture for standby; S2, placing the mixture obtained in S1 in a product mold and hot-pressing to form; S3, placing the semi-finished product hot-pressed in S2 in a high-temperature furnace for carbonization, and keeping vacuum or filling protective gas during the carbonization process; and S4, placing the semi-finished product carbonized in S3 in a high-temperature deposition furnace for CVI gas phase deposition to deposit a C coating, so as to obtain the short-fiber carbon fiber carbon-carbon cartridge.

The invention belongs to the technical field of shielding materials, and discloses aramid fibrid / carbon fiber-based X-ray shielding paper and a preparation method and application thereof.The preparation method comprises the steps that aramid fibrids are soaked in water, carbon fibers are added, and aramid fibrid / carbon fiber mixed suspension liquid is obtained; adding Bi2O3 and La2O3 into the aramid precipitation / carbon fiber mixed suspension, and fully defibering and dispersing to obtain a slurry suspension; carrying out composite suction filtration treatment on the slurry suspension, and carrying out cold pressing and drying to obtain an aramid fibrid / carbon fiber paper base; placing the aramid fiber fibrid / carbon fiber paper base in a phenolic resin impregnation liquid for impregnation treatment, and performing hot pressing to obtain the aramid fiber fibrid / carbon fiber based X-ray shielding paper, the X-ray shielding paper disclosed by the invention has multiple advantages of light weight, efficient shielding, environmental tolerance and workability, and has important significance for promoting industrial development of X-ray shielding materials.

A method of making a reverse selective asymmetric hollow fiber carbon membrane may include heating an asymmetric hollow fiber carbon membrane. The method may also include exposing the asymmetric hollow fiber carbon membrane to an oxygen-containing atmosphere to form a reverse selective asymmetric hollow fiber carbon membrane. After exposing the asymmetric hollow fiber carbon membrane to the oxygen-containing atmosphere, the weight of the reverse selective asymmetric hollow fiber carbon membrane may be from-5% to 20% by weight less than the weight of the asymmetric hollow fiber carbon membrane.

The invention discloses a pitch-based carbon fiber carbon-carbon solid felt preparation method, which comprises: S1, fumigating a carbon fiber felt in a closed environment by using water vapor with a pressure of 2.4-2.6 MPa and a temperature of 850-900 DEG C for half an hour, airing the fumigated carbon fiber felt to a normal temperature, and soaking in a graphene oxide dispersion liquid for 10 min to obtain an activated carbon fiber felt; s2, the activated carbon fiber felt is soaked in a water-soluble phenolic resin solution to be soaked for 20 minutes, and a resin-coated carbon fiber soft felt is obtained.The method relates to the technical field of carbon fiber product processing, the activated carbon fiber felt is soaked in a graphene oxide dispersion solution to be subjected to secondary activation treatment, the surface of graphene oxide is rich in functional groups, and the surface of the graphene oxide is rich in functional groups; the active groups can form strong interaction with the carbon fibers, so that the adhesive force between the carbon fibers and a polymer matrix is improved; meanwhile, the graphene oxide is grafted to the surfaces of the carbon fibers to form a lubricating layer, so that friction among the fibers is reduced, and the agglomeration phenomenon in the processing process of the composite material is avoided.

The application discloses a carbon fiber-carbon nanotube thermal interface material and a preparation method thereof. The preparation method comprises the following steps: pretreatment of carbon fibers, modification of carbon fibers, orientation of carbon fibers, growth of carbon nanotubes and polymer compounding. The preparation method of the carbon fiber-carbon nanotube thermal interface material realizes orientation of carbon fibers and compounding of carbon nanotubes, a primary heat conduction network is formed by the oriented carbon fibers to directly conduct heat; and a secondary heat conduction network is formed by the carbon nanotubes grown in situ on the surface of the carbon fibers to connect the oriented carbon fibers and assist heat conduction, thereby constructing a double heat conduction network. Through the synergistic effect of the double heat conduction network, the in-plane thermal conductivity and the plane-through thermal conductivity of the composite material are improved. Meanwhile, a polymer matrix is used as a matrix, air in the gap between a chip and a package can be fully extruded, the contact thermal resistance between the chip and the package is effectively reduced, and the thermal conductivity of the thermal interface material is improved.

The embodiment of the invention discloses a flow field diffusion layer integrated structure, a preparation method thereof and an electrolytic bath, and belongs to the technical field of water electrolysis hydrogen production, and the flow field diffusion layer integrated structure comprises a flow field structure, a gas diffusion layer and a first binder. The flow field structure and the gas diffusion layer are arranged in a stacked mode in the first direction, the first bonding layer is arranged between the flow field structure and the gas diffusion layer, and the material of the first bonding layer comprises at least one of nickel powder, titanium powder, nickel fibers, titanium fibers, a carbon-based material and a high polymer material. The flow field structure, the first bonding layer and the gas diffusion layer form an integrated structure. According to the flow field diffusion layer integrated structure, the mass transfer efficiency can be improved, the dynamic response performance is improved, the energy efficiency is guaranteed, and the service life is prolonged.

The present application provides a graphite negative electrode material and its preparation method and application. The graphite negative electrode material comprises graphite, a hard carbon layer coated on the surface of the graphite, and a metal oxide layer coated on the surface of the hard carbon layer; wherein the graphite negative electrode material satisfies the relationship: d 002 represents the carbon layer spacing of the graphite negative electrode material, ρ represents the compaction density of the graphite negative electrode material, SSA represents the specific surface area of ​​the graphite negative electrode material, T hard represents the average thickness of the hard carbon layer, T metal Represents the average thickness of the metal oxide layer. In this application, the hard carbon layer is a fiber-based hard carbon layer, obtained by carbonizing organic fibers. It bonds evenly with graphite, exhibits good strength, has high interfacial stability, and can reduce the specific surface area of ​​graphite. The metal oxide layer can improve the electronic conductivity and initial coulombic efficiency of the material. Furthermore, the hard carbon layer and the metal oxide layer can work synergistically to effectively improve the rate performance and specific capacity of the graphite negative electrode material.

The application discloses a synthesis method and application of one-dimensional molybdenum carbide fibers with controllable crystal phase ratio, and belongs to the technical field of nanofiber preparation. The technical scheme is as follows: a carbon source and a molybdenum source are dissolved in a solvent to form a spinning stock solution, the spinning stock solution is prepared into a fiber membrane through a spinning method, and pre-oxidation is carried out under air or oxygen conditions; a carbothermal reduction reaction occurs in an inert atmosphere, different crystal structure molybdenum carbides are formed by controlling the reduction ability of the carbon source on the molybdenum source; and the different crystal structures include one phase or a mixed structure of two phases of metastable alpha-MoC and stable beta-Mo2C. In the reaction of preparing molybdenum carbide by carbothermal reduction of the carbon fiber, the reduction ability of the carbon can be adjusted to realize continuous conversion from the metastable alpha-MoC to the stable beta-Mo2C phase, and the safe, simple, efficient and flexible preparation method greatly reduces the difficulty and cost of material preparation, and provides a basis for the wide application of the molybdenum carbide material in different fields.

The invention discloses an ultrathin flexible ceramic plate as well as a preparation method and application thereof. The ultrathin flexible ceramic plate is prepared from the following raw materials: cordierite powder, PAN (Polyacrylonitrile) fiber, polysiloxane, nano Al2O3, aluminum dihydrogen phosphate sol and a fluorocarbon resin composite coating. The preparation method comprises the following steps: 1) pretreatment; 2) freezing and casting; 3) heat treatment and carbonization; 4) fluorocarbon coating process and hot isostatic pressing; the preparation method comprises the following steps: firstly, carrying out freeze casting to obtain a ceramic plate matrix, and carrying out hot pressed sintering on the ceramic plate matrix to carbonize PAN fibers into carbon fibers to obtain high-strength single-layer ceramic sheets and composite ceramic sheets, so as to obtain the flexible ceramic plate. The obtained ultra-thin flexible ceramic plate is high in strength and toughness, resistant to high temperature and good in sound insulation and heat insulation effect, through precise configuration and chemical coupling of the components, the problem that a ceramic material is crisp if being strong and weak if being thin is solved, and a new scheme is provided for industrialization of flexible ceramics.

The invention provides conductive three-phase ultra-high performance concrete and a preparation method thereof. The steel fibers, the carbon fibers and the conductive nano carbon black are doped into the concrete, so that the construction performance, the mechanical performance and the electric heating performance of the concrete are considered; according to the invention, the steel fiber, the carbon fiber and the conductive nano carbon black are mixed, so that the expansion degree reduction amount and the mechanical property change amount can be approximately regarded as superposition of respective single-doping influence amounts; the reduction amount of resistivity caused by conductive three-phase mixing is far greater than the difference value between the UHPC matrix resistor and the conductive three-phase separately-doped resistor and the UHPC matrix parallel resistor, which means that the size effects of the three resistors are complementary to greatly increase the connectivity of the conductive network; the electrical resistivity of the UHPC at the 28d age is reduced by 99.85% compared with that of the UHPC at the element UHPC during the optimal mixing of the conductive three phases, the electrical resistivity is almost not increased after the 7d age, the temperature is increased by 54.9 DEG C after being electrified for 150min, and the deicing and snow melting application prospect is relatively good.

The invention relates to the technical field of friction materials, and discloses a stable-size and anti-adhesion friction material for an electromagnetic brake and a preparation method of the friction material. The friction material comprises the following raw materials: benzoxazine, bismaleimide, cyanate resin, butyronitrile rubber powder, zinc fibers, modified bamboo fibers, ceramic fibers, silicon carbide whiskers, calcium sulfate whiskers, modified poly (p-phenylene benzobisoxazole) pulp, calcined kaolin, precipitated barium sulfate, magnesium oxide and cashew nut shell oil modified phenolic resin coated amorphous silicon dioxide. The invention also discloses a preparation method of the modified layered magnesium phosphate. The friction material disclosed by the invention has excellent dimensional stability under damp and hot conditions and can avoid rusting of mating plates, so that adhesion and corrosion are avoided.

The present application discloses a carbon / carbon-silicon carbide composite material and a preparation method, comprising a plurality of fiber layers and a plurality of carbon fiber rods arranged in a stacked manner, wherein the carbon fiber rods are longitudinally interspersed with the plurality of stacked fiber layers; the fiber layers include short fiber filaments, a silicon carbide matrix and a carbon matrix, and the silicon carbide matrix and the carbon matrix are distributed in the gaps between the short fiber filaments. The plurality of fiber layers stacked in the present application use short fiber filaments to form a loose and mutually overlapping small silk screen, and the silicon carbide matrix and the carbon matrix are distributed in the gaps between the short fiber filaments, which can form a good fiber / carbon matrix interface, while improving the distribution uniformity of the carbon matrix and the silicon carbide matrix, which is conducive to improving the mechanical properties of the carbon / carbon-silicon carbide composite material; and carbon fiber rods are longitudinally interspersed between the plurality of stacked fiber layers, which can improve the interlayer bonding strength and mechanical properties of the carbon / carbon-silicon carbide composite material.

The utility model discloses an aramid fiber and carbon fiber composite thermal insulation material, which belongs to the technical field of composite thermal insulation materials, and adopts the technical scheme that the aramid fiber and carbon fiber composite thermal insulation material comprises an external reinforced aramid fiber layer, and a middle thermal insulation aluminum silicate fiber layer is arranged at the bottom of the external reinforced aramid fiber layer; an inner-layer synergistic carbon fiber layer is arranged at the bottom of the middle heat preservation aluminum silicate fiber layer, and protective layers are arranged on the sides, away from the middle heat preservation aluminum silicate fiber layer, of the inner-layer synergistic carbon fiber layer and the outer reinforced aramid fiber layer; the outer reinforced aramid fiber layer, the middle heat preservation aluminum silicate fiber layer and the inner synergistic carbon fiber layer are compounded, the outer aramid fiber layer provides mechanical protection and reinforcement effects, and the middle heat preservation aluminum silicate fiber layer focuses on efficient heat preservation; the inner synergetic carbon fiber layer can enhance the overall strength and is matched with the outer reinforced aramid fiber layer, the effect of preventing aluminum silicate fibers from escaping into air is achieved, and therefore the heat preservation performance is enhanced.

The invention relates to the field of carbon fiber preparation, and discloses a carbon fiber in-situ carbonization method which is characterized in that in the process of realizing PAN fiber pre-oxidation and carbonization in a tubular furnace, the PAN fiber is subjected to in-situ carbonization through the change of a carbonization boundary caused by the movement of a furnace plug; the effective pre-oxidized fibers between the pre-oxidized boundaries in the pre-oxidized process before the furnace plug moves are all located in the carbonization boundary entrainment, so that the phenomenon that the PAN fibers are burnt out in the carbonization process due to the influence of the carbonization process on the non-effective pre-oxidized fibers is avoided, and finally the carbon fibers in a fixed carbonization mode are obtained.

The present invention addresses the problem of improving carbon fiber productivity.　This method for producing fibers comprises a step for producing carbon fiber precursor fibers by solution spinning using a spinning dope that is a mixed solution comprising a low-molecular-weight carbon compound containing pitch, a high-molecular-weight carbon compound containing a polybenzimidazole derivative, and a solvent.

The present invention relates to the technical field of waterproof roll materials, and discloses a flame-retardant waterproof asphalt roll material and a preparation method thereof. The flame-retardant waterproof asphalt roll material comprises raw materials in parts by weight: modified asphalt, polyvinyl chloride, an antioxidant, an ultraviolet stabilizer, nano-aluminum oxide, nano-titanium dioxide, magnesium hydroxide, and a self-healing material; a waterproof reinforcement layer comprising: modified asphalt, polyvinyl chloride, polyester fiber, low molecular weight polyethylene, a toughening agent, and a plasticizer; a fireproof and heat-insulating layer comprising: foamed polyurethane, expanded perlite, glass fiber, magnesium carbonate, and hollow glass microspheres; and a lower surface protective layer comprising: polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, aramid fiber, and a plasticizer. The flame-retardant waterproof asphalt roll material provided by the present invention has good flame retardant properties, can effectively reduce the flame spread speed when a fire occurs, and also has excellent waterproof properties, can effectively prevent moisture penetration, and ensure a dry environment for the building.