157 results about "Vacuum Assistance" patented technology

The invention provides a preparation method of an hourglass type covalent organic framework (COF) composite membrane, and belongs to the field of gas membrane separation. According to the method, covalent organic framework nanosheets with different pore diameters and charge characteristics are utilized to construct the COF composite membrane with a unique hourglass structure through a vacuum-assisted layer-by-layer assembly technology, so that precise regulation and control on H2 and CO2 gas transmission behaviors are realized, and the prepared composite membrane shows remarkable H2 / CO2 separation selectivity and high permeation flux, and has a good application prospect. The chemical stability, the thermal stability and the mechanical flexibility are excellent. The invention provides a novel solution for efficient gas separation and energy storage application.

The invention provides a rapid repairing method for an aerospace carbon fiber composite material, and belongs to the technical field of carbon fiber composite material repairing, in the aspect of cleaning, a special cleaning agent for self-research is free of damage and efficient, a preset cleanliness can be achieved by matching with a tool with a replaceable brush head, a foundation is laid for repairing, the damage is accurately measured by advanced detection equipment, the detection precision is 0.1 mm, and the detection efficiency is high. The repair material is scientific in formula and reasonable in component proportion, it can be guaranteed that the performance of a repaired part is close to that of an original part, the strict repair technology such as vacuum auxiliary pressure injection and autoclave curing guarantees sufficient curing and optimal performance of the material, and it is guaranteed that the quality reaches the standard through surface treatment and detection; all the devices of the equipment cooperate and are provided with intelligent systems, parameters can be regulated and controlled, the technology can be automatically adjusted, the structure meets special aviation requirements, carrying and operation are convenient, various scene requirements are met, and the equipment has great significance in guaranteeing aircraft operation and flight safety.

The invention discloses a method for manufacturing a wing rib by using a three-dimensional woven composite material and the wing rib, and relates to the technical field of wings, the method comprises the following steps: S1, determining the form of an integrally woven three-dimensional woven preform according to the geometrical shape of the wing rib to be manufactured; s2, determining a tissue form and basic weaving parameters of a three-dimensional woven fabric of the preform according to the geometric dimension of the wing rib; s3, weaving a prefabricated body; s4, preparing a forming mold; and molding in a molding cavity through a vacuum-assisted resin transfer molding process to obtain the wing rib. According to the wing rib woven through the method, due to the strengthening effect generated by interweaving of the yarn in the three-dimensional woven fabric, the layering resistance of the wing rib is improved when the wing rib bears complex loads, and the bearing capacity of a web flange connecting area is also improved.

The invention discloses a vacuum-assisted pultrusion preforming device for a composite material. The vacuum-assisted pultrusion preforming device comprises a yarn threading plate, a gum dipping tank, a gum extruding roller and a vacuum-assisted preforming mold which are sequentially arranged in the pultrusion direction, wherein fiber bundles penetrate through the yarn threading plate in a layered mode, the gum dipping tank is used for containing resin, and the gum extruding roller is used for extruding redundant resin. The vacuum auxiliary preforming mold is provided with a preforming mold cavity, a vacuum cavity is formed in one section of the preforming mold cavity of the vacuum auxiliary preforming mold, an air exhaust hole is formed in the upper portion of the vacuum cavity, and a semi-permeable membrane allowing gas to pass through but blocking resin to pass through is arranged at the air exhaust hole. And the air exhaust hole is externally connected with a vacuumizing device. The vacuum-assisted pultrusion preforming device can effectively discharge microbubbles in resin and fiber bundles, effectively control uniform distribution of the content of the resin and remarkably promote full infiltration of high-viscosity resin to fibers.

The invention discloses a vacuum sealing method for high-temperature forming of a composite autoclave. The technical problem that a vacuum bag is prone to deformation at high temperature in the prior art is solved. The vacuum sealing method for high-temperature forming of the composite autoclave mainly comprises the steps of assembling of a forming mold, laying of prepreg, vacuum coating of the mold, curing of the autoclave and demolding. The vacuum bag used for wrapping the mold is made of aluminum foil or glass fiber reinforced aluminum foil. The plastic film has good ductility, electrical conductivity, thermal conductivity and shading performance, and can effectively block oxygen, moisture and peculiar smell. The problem of vacuum leakage in the curing process of polyimide and other high-temperature-resistant materials is effectively solved, and a reliable vacuum auxiliary material is provided for molding of products with high temperature resistance level and certain functionality. The method not only improves the forming quality of the composite material, but also reduces the production cost, and has remarkable economic benefits and social benefits.

The invention discloses an underwater electrical interconnection equipment manufacturing technology, and aims to provide an underwater wet-plugging electric connector modularized oil injection device and a vacuum auxiliary oil injection method. The technical scheme is characterized in that the underwater wet-plugging electric connector modularized oil injection device comprises a precise oil injector, a multifunctional pressing plate and a flange locking module; the precise oil injector is a cylindrical body made of a stainless steel material, a through hole is coaxially formed in the center of the precise oil injector, an oil injection connecting hole coaxial with the through hole is formed in the top of the precise oil injector, and the oil injection connecting hole is communicated with the through hole. A side hole which is perpendicular to the axis of the through hole and is communicated with the through hole to form a connecting channel is formed in the bottom of the jack oil bag so as to be communicated with the jack oil bag and convey oil to the jack oil bag; the method is suitable for the technical field of underwater electrical interconnection equipment manufacturing.

The invention discloses a production process for preparing tofu cat litter from wet bean dregs by a one-step method, and belongs to the technical field of tofu cat litter production, resource recycling and environmental protection, and the production process comprises the following steps: treating the wet bean dregs through multistage filter pressing equipment with a continuous vacuum auxiliary function; homogenizing and mixing the filter-pressed wet bean dregs with a reinforcing agent, a binder and a modifier in an ultrasonic dynamic mixing device; performing low-temperature puffing on the mixed material; the production efficiency of the tofu cat litter is remarkably improved, energy consumption is reduced, low carbon and environmental protection are achieved, the processes of repeated drying and water adding are avoided, a reasonable formula and novel equipment are combined, the water absorption, deodorization and antibacterial property of the cat litter are improved, the long-term problem of the bean product industry can be solved, and the production cost is reduced. The defect of poor performance of the environment-friendly cat litter in the market can be overcome, and an innovative resource recycling technical scheme is provided.

The invention belongs to the technical field of electromagnetic shielding materials and conductive polymer-based composite materials, and particularly relates to a flexible aramid nanofiber conductive film and a preparation method and application thereof. The preparation method comprises the following steps: firstly, preparing an aramid nanofiber membrane through vacuum-assisted filtration, and then immersing the aramid nanofiber membrane into a nickel ion-containing solution for ultrasonic pretreatment and activation treatment by a sodium borohydride solution to obtain a modified aramid nanofiber membrane; and mixing with a chemical nickel plating solution under an external magnetic field, drying, and dip-coating with a polydimethylsiloxane packaging solution to obtain the flexible aramid nanofiber membrane. The finally obtained flexible aramid nanofiber conductive film has excellent flexibility, heat resistance and corrosion resistance. The method is easy to operate, economical and environmentally friendly, the material has excellent electromagnetic shielding performance due to the porous layered structure of the formed nanofiber membrane and the nickel coating on the surface, and the problem of mutual interference between electronic elements can be solved.

The invention provides PMMA (polymethyl methacrylate) liquid resin with a flame-retardant function and a preparation method of a ship based on a PMMA liquid resin continuous fiber composite material, and belongs to the technical field of polymer composite material preparation. According to the invention, the continuous fiber material is uniformly laid in the mold, and a vacuum assisted resin transfer molding (VARTM) process is adopted to ensure that the material is fully infiltrated and bubbles are eliminated. The PMMA liquid resin and the continuous fibers are fully combined through normal-temperature curing or heating curing, and a firm hull structure is formed. According to the method, the lightweight, corrosion resistance, transparency and impact resistance of the ship can be effectively improved, and the problem that the thermosetting resin glass fiber reinforced plastic ship cannot be recycled is solved. The whole ship is completely prepared from acrylic resin, complete separation of PMMA and fibers can be achieved by adopting a recovery method with MMA as a solvent, no solid waste exists in the whole process, closed-loop recovery of resources is achieved, and the method has great significance in energy conservation and environmental protection.

The invention discloses a high-toughness carbon-glass super-hybrid composite material as well as a preparation method and application thereof. Carbon fiber broadened filaments and glass fiber broadened filaments prepared by ultrathin carbon fiber spreading equipment are subjected to super-hybrid doubling, and the carbon-glass super-hybrid composite material with better reinforcing and toughening effects is prepared through a vacuum-assisted resin transfer molding process. An existing mixing method is improved, the problems that an interlayer mixing method is poor in mixing designability, low in fiber mixing degree, poor in toughening effect and the like are solved, the prepared carbon-glass super-mixed composite material has better reinforcing and toughening effects, and under the same carbon-glass volume ratio, the carbon-glass super-mixed composite material has the better reinforcing and toughening effects. The carbon-glass super-hybrid composite material is higher in tensile modulus, elongation at break and loss factor, and a drop hammer impact test shows that the carbon-glass super-hybrid composite material has the characteristics of larger energy absorption, small damage area and the like. In conclusion, the carbon-glass super-hybrid composite material shows better reinforcing and toughening effects, the mechanical property of the composite material is improved, and the carbon-glass super-hybrid composite material is better than an interlayer hybrid composite material on the whole.

The invention relates to the technical field of composite materials with textile structures, in particular to a preparation method of a three-dimensional warp-direction interlocking woven composite material with different reinforced structures, which comprises the following steps: firstly, carrying out straightening treatment on aramid fibers, and adopting the aramid fibers as warp and weft yarns, weaving a three-dimensional warp-direction interlocking woven fabric preform on a three-dimensional rapier loom controlled by a computer; preparing a resin matrix from epoxy resin, a reactive diluent and a polyether amine curing agent; carrying out vacuum-assisted resin transfer molding on the woven aramid fiber three-dimensional warp-direction interlocking woven fabric; and the three-dimensional warp-direction interlocking woven composite material with different reinforced structures is prepared by regulating and controlling a stacking mode. Through fiber low-damage weaving, structure regulation and control design and orthogonal interlocking lamination, the problems of layering sensitivity and anisotropy of the three-dimensional warp-direction interlocking woven composite material under the extreme load can be solved, and technical support is provided for achieving the excellent mechanical property, low-damage manufacturing, low cost and light weight of the three-dimensional woven composite material.

The invention belongs to the technical field of electromagnetic shielding and thermal management materials, and particularly relates to an electric insulation aramid nanofiber electromagnetic shielding composite film and a preparation method thereof. The composite film comprises an ANF layer, an LM-coated AgNWs conductive layer and a PDMS electrical insulation layer which are stacked in sequence, and the multifunctional composite film with high conductivity, high thermal conductivity, excellent electromagnetic shielding performance and electrical insulation is constructed through vacuum-assisted suction filtration, hot pressing and blade coating processes. The electromagnetic shielding effectiveness of the composite film in the X wave band reaches up to 92 dB, the volume resistivity exceeds 1 * 10 < 15 > omega.cm, and the composite film has good mechanical strength, flexibility and environmental stability and is suitable for electromagnetic protection and thermal management in electronic packaging, flexible electronics and extreme environments.

The invention discloses a bacterial cellulose / silver nanowire / MXene composite conductive film and a preparation method thereof, and relates to the technical field of flexible conductive materials. The composite film comprises a bacterial cellulose substrate, an MXene conductive layer and a silver nanowire conductive network layer. The preparation method comprises the following steps: S1, preparing bacterial cellulose dispersion liquid; s2, preparation of an MXene dispersion liquid; s3, preparing a silver nanowire dispersion liquid; and S4, preparing the composite film. The composite film with a Janus structure is prepared through a vacuum-assisted layer-by-layer filtering process, and the composite film has high mechanical performance, low square resistance, excellent electromagnetic interference shielding effectiveness, rapid Joule heating performance and excellent environmental stability and mechanical durability. The problem that an existing flexible electromagnetic shielding material is difficult to consider ultrathin performance, high flexibility, strong mechanical performance and multifunctional integration is solved, and the flexible electromagnetic shielding material has wide application prospects in the fields of electromagnetic shielding, flexible electronic devices, wearable heaters and the like.

The application provides a polydicyclopentadiene / glass fiber felt composite material and a preparation method thereof. The method comprises the following steps: step (1): laying a glass fiber felt on a glass plate, sequentially laying a release cloth, a flow guide net and a vacuum bag, and performing vacuum pumping and pressure maintaining; step (2): pouring a cyclic olefin liquid into the vacuum bag in step (1), performing stage temperature rising and curing, and releasing a polydicyclopentadiene / glass fiber felt composite material. The cyclic olefin liquid is configured as follows: A1, uniformly mixing 100 parts by mass of DCPD and 5-20 parts by mass of a TCPD system to prepare a mixed solution; wherein the TCPD system comprises 10wt% of TCPD and 90wt% of DCPD; A2, dissolving 0.02-0.06 parts by mass of a Grubbs second-generation catalyst and 0.002-0.006 parts by mass of a retarder in 1-2 parts by mass of a high-boiling-point silane coupling agent, and adding the mixture into the mixed solution in step A1 to prepare a liquid. The method adopts a vacuum-assisted resin infusion molding (VARI) technology, has the characteristics of simple operation and rapid reaction, and the obtained composite material has high mechanical properties.

The utility model relates to battery package airtightness detects the field of inflation, especially based on the quick airtightness detection inflation device of battery package of vacuum auxiliary. The utility model provides a kind of to seal between sealing cover and detection box while closing sealing cover, avoid the formation of poor sealing interference vacuum environment based on the quick airtightness detection inflation device of vacuum auxiliary of battery package. A kind of quick airtightness detection inflation device of battery package based on vacuum auxiliary, including base and first electric guide rail etc., base left and right two parts upper side are connected with first electric guide rail. The utility model passes through sealing extrusion block extrusion connecting rod, drives connecting rod rotation, so that connecting rod extrusion damper, while connecting rod rotates, extrusion push plate and move sealing extrusion block inward, so that push plate and sealing cover contact and seal, reach to seal between sealing cover and detection box while closing sealing cover, avoid the formation of poor sealing interference vacuum environment effect.

The invention discloses a preparation method of a three-dimensional graphene carbon fiber composite board. The method comprises the following steps: preparing three-dimensional graphene by adopting a chemical vapor deposition method, placing the three-dimensional graphene in the middle of carbon fiber cloth, and then preparing the three-dimensional graphene carbon fiber composite material laminated plate by adopting a vacuum-assisted resin transfer molding process. And testing the modal damping ratio of the carbon fiber composite material laminated plate by using a hammering method. The modal damping ratio of the carbon fiber composite material laminated plate is 3.03%, the modal damping ratio of the three-dimensional graphene carbon fiber composite material laminated plate is 6.72%, and compared with the carbon fiber composite material laminated plate, the modal damping ratio of the three-dimensional graphene carbon fiber composite material laminated plate is improved by 122%. The common amplitude value of the three-dimensional graphene carbon fiber composite material laminated plate is lower than that of the carbon fiber composite material laminated plate.

The utility model provides a vacuum auxiliary grouting control system. The vacuum auxiliary grouting control system comprises a grouting mechanism and a vacuum mechanism which are connected with the two ends of a box girder pore channel through connecting joints respectively. The connecting joint comprises a pipe head and a sealing sleeve, one end of the pipe head extending into the box girder duct is sleeved with the sealing sleeve, and the other end of the pipe head is connected with a rubber pipe through a detachable joint; a check ring corresponding to the sealing sleeve is arranged at the end of the pipe head, the sealing sleeve is assembled in a sliding mode in the axial direction of the pipe head, and the stop spiral ring and the check ring are matched to extrude the sealing sleeve in the axial direction so that the sealing sleeve can tightly extrude the pipe head and the inner wall of a box girder hole channel in the radial direction. Vacuum auxiliary equipment is arranged for air exhaust, so that the duct of the box girder is in a vacuum state, the whole pipeline is filled with slurry, the plumpness and compactness are improved, it is guaranteed that the slurry in the duct is full and dense, the slurry is closely connected with the steel strand, no bubble or cavity exists in the slurry, and the grouting plumpness is guaranteed; and the mud jacking time is greatly shortened through vacuum assistance, and the production work efficiency is greatly improved.

The present application relates to a kind of blended fabric segmented steaming fixation method, comprising the following steps: blended fabric is sequentially carried out desizing, kiering, bleaching and mercerizing treatment, and pretreatment blended fabric is obtained after drying;Using composite reagent on pretreatment blended fabric is carried out padding treatment or vacuum-assisted foam impregnation treatment, and pre-treatment blended fabric is obtained after hot air drying;Prepare dye liquor, and after using dye liquor on pre-treatment blended fabric is carried out dye liquor padding treatment, then carry out segmented steaming fixation treatment, and after sequentially washing, drying, setting, obtain dyed blended fabric.The present application uses the composite reagent containing Ageratina pichurini ethanol extract and simmondsia chinensis seed oil to carry out padding treatment or vacuum-assisted foam impregnation treatment on blended fabric before dyeing, then carries out segmented steaming fixation treatment, can significantly improve the tensile strength and wash fastness of blended fabric, while giving blended fabric good gloss, and can make blended fabric keep better perspiration fastness.

The invention relates to the technical field of anti-fouling surface treatment of a microstructure of a grating injection molded part, and discloses an anti-fouling surface treatment method of a microstructure of a highlight grating injection molded part, which comprises the steps of mold microstructure processing, vacuum-assisted injection molding, rapid cooling and stress release, surface pretreatment, plasma activation treatment, nano hydrophobic coating spraying and quality detection. By means of the treatment method, the highlight visual effect can be kept while the anti-pollution effect of the grating injection molding part is improved.

The invention belongs to the technical field of thermal spraying coating hole sealing, and discloses a hole sealing method based on the porosity of a thermal spraying coating, which comprises the following steps: forming a coating on the surface of a base material through a thermal spraying process, applying hole sealing glue on the surface of the coating, and forming a hole by utilizing the structural characteristic that open pores are communicated with one another. Enabling the hole sealing glue to naturally permeate into the coating under the action of gravity, enabling the hole sealing glue to at least permeate into the coating by 500 microns before curing by controlling the surface tension, viscosity and curing conditions of the hole sealing glue, and continuously filling holes; and then the coating is subjected to low-temperature curing treatment, so that the hole sealing glue forms a stable hole sealing structure in the holes. After the method disclosed by the invention is adopted, no less than 95% of open pores in the coating can be effectively sealed under the condition of not applying external pressure or vacuum assistance, so that the voltage resistance of the thermal spraying coating is stabilized at 500V or above, and the resistance value is improved from megohm level to gigaohm level, thereby obviously improving the electrical property and corrosion resistance of the coating.

The application belongs to the field of new material membrane separation, and relates to a COF / MXene composite membrane and a preparation method and application thereof. x nanosheet dispersion solution to obtain an Mxene solution; (2) a TpPa-SO3H nanosheet solution is prepared to obtain a COF solution; (3) the TpPa-SO3H nanosheet solution is first deposited on a nylon porous base membrane through vacuum-assisted self-assembly to form an intermediate porous COF layer, and then the Ti3C2T x nanosheet dispersion solution is deposited on the COF layer to prepare the COF / MXene composite membrane. The preparation method is simple in operation and high in repeatability, and the obtained composite membrane has excellent separation performance and can efficiently separate organic pollutants such as dyes in water.

The application discloses a kind of preparation methods of high-performance alumina fiber reinforced ceramic matrix composite, including preparation alumina fiber fabric, preparation magnesium aluminate spinel aqueous sol, preparation composite material: magnesium aluminate spinel aqueous sol is brushed on alumina fiber fabric, and after surface drying, it is laminated hot-pressing to its prepreg, then put into muffle furnace and sintered, after cooling to 25 DEG C, obtain the initial alumina fiber ceramic composite material, the alumina fiber ceramic composite material is placed in vacuum assisted impregnation device vacuum assisted impregnation, then put into oven and dried, repeat sintering-vacuum assisted impregnation-drying step, finally, sinter again to obtain the final alumina fiber ceramic matrix composite material;The composite material prepared by the application has good wave-transparent performance, strong mechanical properties, is suitable for use in extreme environments such as ultrahigh temperature and supersonic speed, and the prepared composite material has high surface flatness, is suitable for secondary processing, can be constructed in large size, and is environmentally friendly.

The application belongs to the technical field of fiber composite materials, and more particularly relates to a pre-embedded detachable bolt connection structure suitable for a composite material component and a forming method thereof. An insulating isolation layer is coated on the head of a countersunk bolt and part of the shank of the bolt, and then the bolt is inserted into a positioning blind hole of a polytetrafluoroethylene mold plate, and an inclined slope is arranged at the edge of the mold plate. A carbon fiber cloth with a hole is laid so that the bolt passes through the through hole, and after the layer reaches the top of the bolt, a complete carbon fiber cloth is laid to the designed thickness. A release cloth and a flow guide net are laid, a vacuum pipeline is arranged to be attached along the inclined slope, a vacuum bag is covered to form a sealed vacuum cavity, and a vacuum-assisted resin infusion forming process is used to realize integrated forming of the composite material component with the pre-embedded bolt. After demolding, residual resin on the threads is removed, and a connected part and a nut are installed to complete detachable connection. The application realizes detachable connection without drilling holes, maintains the integrity of the composite material structure, improves the mechanical properties and water tightness, and reduces the risk of galvanic corrosion.

A device for preparing porous carbon spheres with uniform and controllable particle size is disclosed, which relates to the field of carbon material preparation technology. A stirring mechanism is disposed inside a mixing tank, and symmetrical conveying tanks are fixed to the top wall of the mixing tank. A proportioning conveying mechanism is disposed at the center of the outer top wall of the mixing tank and connected to the conveying tanks. A sealing block abuts against the inner top of the water outlet pipe at the bottom of the mixing tank, and a discharge pipe is movably disposed inside the water outlet pipe, which is connected to the sealing block via a linkage mechanism. An inlet on the upper side of the preparation chamber is inserted in conjunction with the discharge pipe. An isolation ring is disposed on the upper side inside the preparation chamber, and a sealing mechanism is disposed inside the isolation ring, which is connected to the inner bottom wall of the preparation chamber. Through the streamlined design of proportioning conveying, vacuum-assisted injection, and online template dissolution, a continuous process for preparing porous carbon spheres from raw material mixing to template removal is achieved, significantly improving the uniformity of product particle size, batch stability, and production efficiency.

The present invention belongs to the field of materials science, and specifically discloses a highly absorbent electromagnetic shielding and thermally conductive epoxy composite material, a preparation method and uses thereof. The preparation method of the composite material is as follows: BN, MWCNT and cellulose are mixed evenly and then form a wavy oriented structure through an ice template, and after vacuum drying, it is carbonized at high temperature. Subsequently, the epoxy resin curing components are stirred evenly and then poured into the ceramic skeleton through vacuum assistance, and the poured skeleton is cured at high temperature to obtain the BN / MWCNT / EP composite material. The material is mainly composed of a ceramic skeleton composed of boron nitride (BN) and multi-walled carbon nanotubes (MWCNT) and an epoxy matrix. Under the extrusion force of ice crystal growth, BN is wound by MWCNT and overlaps with each other to form a thermal conduction path. At the same time, MWCNT forms an electrical conduction path and absorbs electromagnetic waves through multiple reflections to cause dielectric loss. The prepared epoxy resin composite material has high absorbent electromagnetic shielding efficiency and thermal conductivity, and at the same time, its mechanical properties are also greatly improved.

This invention relates to a device and process for preparing self-reinforcing and self-healing shape memory composite materials. It innovatively employs a vacuum-assisted injection method to composite and cure epoxy-based shape memory polymers (SMP) with tensioned NiTi shape memory alloy (SMA) wires. The thermotropic shrinkage properties of the NiTi alloy wires are utilized to improve the stiffness of the epoxy matrix while simultaneously healing internal microcracks. This preparation process and supporting equipment can minimize defects in the preparation and use of composite materials and enable semi-automatic control of the composite material's stiffness.

The invention relates to the technical field of autoclave forming molds, in particular to a special-shaped net-size autoclave forming mold for PBO composite materials, which comprises a forming molded surface, a vacuum system, a vacuum pump, a vacuum pump, a vacuum pump, a vacuum pump, a vacuum pump, a vacuum pump and a vacuum pump, the pressure device is used for providing pressure and exhausting internal redundant gas during product curing molding; the positioning device comprises a positioning strip made of special alloy invar steel, and the positioning device and the shaping molded surface act synergistically, so that a workpiece is positioned through the positioning device when the workpiece is attached to the shaping molded surface for appearance shaping; the demolding device is matched with the positioning device to work and is used for demolding the molded workpiece; according to the device, the positioning part and the demolding part are arranged, so that a part can be formed at a designed position, machining allowance is avoided, the part can be formed in a clear edge mode, and the problems that post-machining difficulty is large, and the part is prone to being damaged and scrapped are perfectly solved.

The invention relates to the technical field of composite materials, and discloses a thin-layer composite material and a preparation process thereof, thin fiber dry yarn is laid on a bottom layer according to a preset direction, double faced adhesive tapes attached to two ends of the thin fiber dry yarn are temporarily fixed on the surface of the bottom layer, release paper is used for covering the exposed surface of the thin fiber dry yarn, and the thin-layer composite material is prepared. Pre-fixing of the thin fiber dry yarn is completed; vacuum auxiliary pressure is applied, the thin fiber dry yarn is preliminarily pressed into the bottom layer and fixedly embedded in the bottom layer, then the vacuum bag and the release paper are removed, and preliminary embedding of the thin fiber dry yarn is completed; fixing the two ends of the dry fiber yarn by using high-temperature-resistant adhesive tapes and removing the double-sided adhesive tapes to complete the fixation of the thin dry fiber yarn; the steps are repeated until the designed laying sequence and total thickness are achieved, and laying of the laminated laying layers is completed; and curing the laminated layer by adopting a composite material curing process, and immersing the resin in the fiber prepreg near the thin fiber dry yarn into the thin fiber dry yarn in the curing process to form a thin layer so as to prepare the thin-layer composite material.

This invention discloses a vacuum-assisted homogenization and temperature-controlled 3D printing method and apparatus for irregularly shaped viscoelastic propellants, belonging to the field of additive manufacturing technology for energetic materials. The vacuum-assisted homogenization and temperature-controlled 3D printing method for irregularly shaped viscoelastic propellants achieves online degassing and precise temperature control of the slurry in a closed vacuum environment through synergistic physical field control. The technical solution of this application has the following technical effects: it abandons the inert gas protection method that may introduce new gas sources, and adopts a synergistic physical degassing mechanism based on low vacuum negative pressure, supplemented by ultrasonic vibration and pulsed vacuum fluctuations. The stable negative pressure environment provides a continuous driving force for the escape of gas inside the slurry; ultrasonic vibration acts on the slurry, which can destroy the adhesion state of microbubbles and promote their aggregation; pulsed vacuum fluctuations cause the bubbles to be in a periodic expansion and contraction state, thereby accelerating their instability and rupture. The above three physical fields cooperate and work synergistically.