212 results about "Fiber carbon" patented technology

The invention discloses a high-strength short fiber carbon ceramic brake disc and a preparation method thereof, and the preparation method comprises the following steps: carrying out ball milling on silicon powder and carbon powder, mixing with thermosetting resin powder and thermoplastic resin powder, uniformly mixing carbon fiber and a coupling agent, adding the mixed powder, and uniformly mixing again. According to the short fiber carbon ceramic brake disc provided by the invention, the ball-milled silicon powder and carbon powder are uniformly dispersed in the matrix, meanwhile, the thermoplastic resin with good fluidity is added to form a network structure in the matrix, through holes are formed after carbonization, and the high-strength short fiber carbon ceramic brake disc is obtained. Silicon steam can enter in the ceramization process, and the problem that the carbon-ceramic composite material which is high in fiber content and large in thickness and formed at high temperature and high pressure is difficult to infiltrate can be effectively solved. The carbon-ceramic short fiber brake disc prepared by the method is low in aperture ratio and high in impact strength.

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 belongs to the technical field of preparation of composite prepregs, and provides equipment and a method for preparing fiber arrangement micron-sized controllable ultra-thin composite prepregs. The equipment comprises a shell, a protofilament preparation assembly, a filament supply assembly, a fiber oxidation assembly, a fiber carbonization assembly, a fiber sizing assembly, a fiber tension control assembly, a fiber position adjusting assembly and a fiber winding assembly. According to the equipment and the method for preparing the ultra-thin layer composite material prepreg with the micron-sized controllable fiber arrangement, the fiber position can be accurately controlled, the micron-sized accurate arrangement of the fiber is realized, the uniformity and the regularity of fiber distribution are ensured, the mechanical property and the stability of the composite material can be remarkably improved, and the application prospect is wide. The appearance of a fat-rich region and a fiber-rich region is reduced; a nondestructive fiber treatment and layering method is adopted, and fiber tension and position are precisely controlled, so that fiber damage caused by fiber expansion in a traditional method is avoided, and integrity and strength of fibers are kept.

The invention discloses a preparation method of an extremely cold-resistant thermo-oxidative aging-resistant waterborne polyurethane electrothermal film, which can be used for heating an emergency camping tent in an extremely cold environment. Through molecular design and structural regulation, silicon-containing long-chain dihydric alcohol, DOPO flame-retardant dihydric alcohol and hindered phenol thermal oxidation resistant groups are introduced into a molecular chain of the waterborne polyurethane, so that the low temperature resistance, thermal oxidation aging resistance, bending resistance and flame retardance of the waterborne polyurethane are improved. The designed high and low temperature resistant waterborne polyurethane is taken as a base material, and is combined with conductive fillers such as carbon fibers, carbon nanotubes, graphene, conductive carbon black and the like to prepare the electrothermal film, and the designed electrothermal film can still keep the original electrothermal performance in extreme environments such as high and low temperatures, complex chemical environments (salt, alkali, acid and the like), long-time circulation and the like.

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 belongs to the technical field of brake pad materials, and aims to solve the problems that the friction coefficient of an existing organic-based brake pad is unstable, so that brake failure is likely to occur, the driving safety is affected, the operation cost is increased due to frequent replacement of the brake pad, and normal operation of rail transit is affected. Therefore, the invention provides the organic track brake pad material with the high friction coefficient and the preparation method thereof. The material comprises 20-30% of thermosetting phenolic resin, 8-15% of bismaleimide resin, 8-12% of polyimide resin, 6-10% of high-strength carbon fiber, 6-10% of aramid fiber, 4-8% of basalt fiber, 3-6% of graphite, 2-5% of molybdenum disulfide, 3-6% of copper fiber, 2-5% of silicon carbide particles, 3-6% of barium sulfate, 2-4% of aluminum oxide, 2-4% of talcum powder, 2.5-5% of a curing agent and 1.5-3.5% of other auxiliaries. The friction performance of the organic track brake pad material is improved under the condition that other performance of the organic track brake pad material is not reduced, the defect of the friction performance of an existing brake pad material is effectively overcome, and reliable guarantee is provided for high-performance safe operation of track traffic.

The invention discloses wear-resistant plastic particles and a preparation method thereof, and relates to the technical field of plastic particles. Comprising the following raw materials in parts by mass: 70-90 parts of polypropylene, 80-100 parts of polyethylene, 6-8 parts of friction-increasing filler, 1-2 parts of polyol ester, 1-2 parts of calcium stearate, 2-3 parts of polyamide, 1-2 parts of a plasticizer, 1-2 parts of a high-impact-resistance toughening agent, 1-3 parts of a hydrophobic polymer, 2-3 parts of an antioxidant and 2-4 parts of an adhesive. When the plastic particles are manufactured, a mixed substance composed of silicon dioxide, glass fibers, carbon fibers and nano-particles is adopted as a friction increasing filler to be matched with the high-impact-resistance toughening agent, so that the wear resistance of the plastic particles can be effectively improved, and the wear resistance of the plastic particles is improved while the wear resistance is improved. Therefore, the plastic particles have wear resistance and also have various properties such as good flame retardance, supporting property and hydrophobicity.

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 invention belongs to the technical field of vegetable culture media, and relates to a leaf vegetable culture medium with pepper seed meal as a raw material and a preparation method thereof.The leaf vegetable culture medium is prepared by mixing and stirring pepper seed meal leavening, regenerated old media, activated coco coir powder, bamboo fiber charcoal powder, modified diatomite, modified zeolite powder and an adhesive according to the mass ratio of (8-12): (4-8): (2-4): (1-3): (3-7): (1-3): (1-3); placing for 2-3 days in an environment with the humidity of 70-80% and the temperature of 40-50 DEG C, then drying until the water content is less than or equal to 8%, and sterilizing to obtain the leafy vegetable culture medium. The Chinese prickly ash seed meal is used as a main raw material, and combined with compound bacteria fermentation, old substrate regeneration, functional material modification and waste high-value treatment, the defects of an existing substrate in the aspects of environmental friendliness, nutrient release, recovery rate, water and fertilizer retention capacity and the like are systematically overcome.

The invention discloses a method and system for efficient pyrolysis recovery and resource cyclic utilization of an ex-service wind power blade, and the method comprises the following steps: cutting the ex-service wind power blade, and carrying out primary pyrolysis at 400-600 DEG C to obtain a primary pyrolysis blade with a locally carbonized resin matrix; carrying out microwave enhanced pyrolysis on the primary pyrolysis blade, and inducing to generate local high temperature and targeted energy to enhance the deposition effect of carbon dots on fibers by utilizing the strong wave absorbing characteristic of carbon-based components in the primary pyrolysis blade, so as to synthesize a fiber-carbon dot composite material in situ; a solid product obtained through microwave enhanced pyrolysis is screened, and a fiber-carbon dot composite material and a carbon black material are separated out; the fiber-carbon dot composite material is used for preparing concrete. According to the method, rapid and efficient dissociation of the resin and the fiber in the retired wind power blade is realized, the treatment time is shortened, and the pyrolysis energy consumption is greatly reduced.

The invention discloses a production process of a high-toughness plastic packaging bag, the packaging bag comprises the following raw materials: polytetrafluoroethylene, molybdenum disulfide, graphite, plant fiber, glass fiber, carbon fiber, aromatic polyamide fiber, attapulgite, white carbon black, polyacrylamide, an auxiliary agent and vinyl trimethoxy silane, the production process comprises the following steps: S1, plastic raw materials are selected, and the plastic raw materials are uniformly mixed; adding into a high-degree mixer and uniformly mixing; s2, an auxiliary agent is added in the process of S1, and high-temperature mixing is carried out to form a molten state; s3, enabling the materials in the S2 to pass through a screw extruder base to form a tubular film blank, and performing film blowing and shaping by using a film blowing machine to form a film; and S4, using a bag making machine to carry out operations such as edge sealing, cutting and trepanning on the film, and packaging and warehousing finished products. Compared with the prior art, the plastic packaging bag has the advantage that the toughness and wear resistance of the plastic packaging bag can be improved.

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 provides a composite PBO fiber, a composite skeleton, a preparation method of the composite skeleton, a composite membrane, a preparation method of the composite membrane and application of the composite membrane, and belongs to the field of composite membranes. The invention provides a composite PBO fiber. The composite PBO fiber comprises a PBO fiber body and polybenzophenone type benzoxazine, wherein the surface of the PBO fiber body is coated with the polybenzophenone type benzoxazine. The hydroxyl group of the polybenzophenone benzoxazine in the composite PBO fiber can form a hydrogen bond with the carbonyl group in the PEEK, so that the interface thermal resistance between the polymer and the filler is weakened, and the interface compatibility is improved at the same time. In addition, the hydrogen-bond interaction also effectively reduces TT-Pi accumulation among the carbon nanofillers, the dispersity of the carbon nanomaterial is improved, and the thermal conductivity of the composite film prepared from the composite PBO fibers and the carbon nanomaterial is improved.

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 discloses high-strength anti-crack foam concrete, and belongs to the technical field of concrete. The concrete is prepared from the following raw materials in parts by weight: 200-300 parts of cement, 10-20 parts of silica fume, 20-40 parts of fly ash, 1-2 parts of a foaming agent, 5-15 parts of fine aggregate, 1-3 parts of a foam stabilizer, 5-10 parts of a modified bamboo fiber-carbon nanotube composite material, 0.5-1 part of a water reducing agent and 120-130 parts of water. The high-strength anti-cracking foam concrete prepared by adding the modified bamboo fiber-carbon nanotube composite material prepared by a specific method as a reinforcing agent and mixing and stirring with other raw materials has the characteristics of low dry density, high strength, excellent anti-cracking performance and the like, and has a good market application prospect.

The invention discloses a preparation method of a three-dimensional carbon fiber reinforced resin-based composite material, which comprises the following steps: preparing a three-dimensional carbon fiber fabric reinforcement by using mesophase pitch carbon fiber cloth as an XY-direction reinforcement and polyacrylonitrile-based carbon fiber as a Z-direction reinforcement; sequentially carrying out graphitization, electrochemistry and surface sizing treatment on the three-dimensional carbon fiber fabric reinforcement; the preparation method comprises the following steps: dispersing inorganic nano heat-conducting particles in organic resin to obtain a matrix resin system; and placing the three-dimensional carbon fiber fabric reinforcement in a mold, and injecting the matrix resin system by adopting an RTM (Resin Transfer Molding) process to obtain the composite material. The room-temperature XY-direction thermal conductivity of the composite material is 208-258 W / (m.K), the Z-direction thermal conductivity of the composite material is 5-54 W / (m.K), and the composite material has excellent mechanical properties, can be used for preparing aerospace aircraft structures / functional parts, and can also meet the requirements of other industrial equipment fields on light-weight, high-strength, high-modulus and high-thermal-conductivity composite materials.

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 provides a carbon fiber intramedullary nail and a preparation method thereof, and relates to the technical field of orthopedic implants, at least two layers of outer layer fibers are spirally wound around a central fiber to prepare a hybrid fiber composite rope strand; the hybrid fiber composite rope strands are axially loaded and twisted with the core mold as the center, a spiral carbon fiber prefabricated body is formed, and a mold is pre-buried in the carbon fiber prefabricated body to form screw holes; the carbon fiber prefabricated body is sequentially subjected to hot pressing, cooling and heat treatment, the carbon fiber intramedullary nail is obtained, and fibers of the hybrid fiber composite rope strand comprise polyaryletherketone resin fibers, carbon fibers and biodegradable metal fibers. The biodegradable metal fiber is used as a pore-forming fiber, a series of porous intramedullary nails with accurate pore size distribution can be obtained, and the porous intramedullary nails have the characteristics of cancellous bone-like hierarchical pore sizes while having high connectivity; by means of gradual degradation of the metal fibers in the body, the nail body is gradually transited from firm fixation to biological fixation, the human skeleton healing cycle is matched, and the purpose of precise healing is achieved.

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 relates to a preparation method of a composite fiber non-woven fabric, which comprises the following steps: step 1, firstly grinding viscose fibers, cellulose acetate fibers, polyester fibers, polypropylene fibers, polyamide fibers, metal fibers, carbon fibers, high-crimp fibers and antistatic fibers into powder; stirring the powder, epoxy resin, butadiene styrene rubber and a small amount of water in a stirrer for 10-15 minutes to obtain a fiber solution; 2, metal fibers, carbon fibers, high-crimp fibers and anti-static fibers are interspersed and mixed into conventional raw materials, according to the characteristic that the saturation force of the fibers is low, the surfaces of the non-woven fabrics are evenly coated with the hot melt adhesive through a coating machine or a spraying machine, then the two non-woven fabrics are pressed together through a hot press, and the non-woven fabrics are manufactured. The hot melt coating generally can provide higher bonding strength and consistency, the composite fiber non-woven fabric is prevented from being easily broken or torn, and the two non-woven fabrics are pressed together by a hot press to avoid the conditions of unevenness, uneven surfaces and the like.

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.