293 results about "Quartz fiber" patented technology

The invention discloses a heat-proof skirt which is of a single-layer or multi-layer structure, each single-layer material is formed by compositing quartz fiber cloth and coating when multiple layers are arranged, the heat-proof skirt is made of 6-8 single-layer materials, and the skirt edge is in a wave shape. The coating is prepared from the following raw materials in parts by weight: 4 to 6 parts of vinyl polysiloxane, 15 to 20 parts of hydrogen-containing silicone oil, 15 to 20 parts of ammonium polyphosphate, 10 to 15 parts of aluminum hydroxide, 5 to 8 parts of silicon dioxide, 0.005 to 0.02 part of a platinum catalyst and 30 to 40 parts of a solvent. The heat-proof skirt has contractility, and the influence on normal swinging resistance of the engine is reduced to the maximum extent.

The invention belongs to the technical field of quartz ceramics, and particularly relates to a thermal shock resistant quartz fiber reinforced quartz ceramic composite material and a preparation method thereof. The preparation method of the thermal shock resistant quartz fiber reinforced quartz ceramic composite material comprises the following steps: S1, pretreating quartz fibers; s2, dipping the pretreated quartz fibers in first silica sol to prepare coating quartz fibers; s3, the coated quartz fibers are placed in second silica sol to be subjected to dipping forming treatment and high-temperature calcination, and the thermal shock resistant quartz fiber reinforced quartz ceramic composite material is obtained. The composite material disclosed by the invention can realize good thermal shock resistance, meanwhile, the bending strength is improved, the dielectric constant and the loss tangent value are reduced, and the composite material has a very good application prospect.

According to the quartz fiber glass bead defect detection method and system based on microscopic imaging, since the glass beads are of a three-dimensional structure, the internal defects of the glass beads can be distributed at different heights, and the defects of the glass beads can be detected by carrying out region division on the whole disc of quartz fiber glass beads, determining different focal planes and carrying out microscopic scanning on different regions on each focal plane in sequence. Acquiring a plurality of focal plane images corresponding to different focal planes of the whole disc of quartz fiber glass beads, and splicing the same focal plane images corresponding to different areas to ensure that all potential defects of the quartz fiber glass beads are imaged; and then defects in the image are identified, positioned and classified by using deep learning, so that manual subjective errors are avoided, and the detection efficiency and accuracy are remarkably improved.

The invention discloses an insulating ceramic material, a preparation method thereof and application of the insulating ceramic material in a semiconductor heater. The insulating ceramic material comprises the following raw materials in parts by weight: 70-80 parts of aluminum oxide, 20-30 parts of boron nitride, 1-2 parts of magnesium oxide, 2-3 parts of quartz fiber powder and 4-6 parts of a modifier, the preparation method of the modifier comprises the following steps: reacting sodium alginate with 3, 3 '-dithiobis (4-aminobenzoic acid) to generate a first intermediate, reacting the first intermediate with polyacrylic acid to generate a second intermediate, and generating the modifier from the second intermediate under the action of aluminum chloride. The insulating ceramic material disclosed by the invention has excellent mechanical property, heat-conducting property and insulating property, and can remarkably improve the working performance of the semiconductor heater and prolong the service life of the semiconductor heater when being applied to the semiconductor heater.

The invention relates to an organic wave-transparent composite material for improving high-temperature dielectric loss stability based on high-temperature oxygen release and carbon removal and a preparation method thereof.The organic wave-transparent composite material is prepared by selecting polymethyl ethoxy siloxane (PMES) as a precursor, trifunctional rigid silane as a cross-linking agent, polymethyl ethoxy siloxane (PMES), trifunctional rigid silane, a solvent ethanol and a catalyst through a hydrothermal method. The preparation method comprises the following steps: preparing an organic silicon resin solution by mixing, and adding ceric nitrate into the resin solution; an organic silicon resin solution is compounded with a quartz fiber preform through an RTM (Resin Transfer Molding) process, and the organic wave-transparent composite material with good dielectric properties is obtained through dipping, curing and drying. Compared with the prior art, the composite material has the function of stable dielectric property at high temperature, and can be applied to missile radar radome materials.

The invention relates to a quartz fiber reinforced PEEK resin-based wave-transparent composite material and a forming method thereof, and the forming method comprises the following steps: uniformly coating a layer of PEEK resin powder on quartz fiber cloth, repeatedly laying the quartz fiber cloth and the PEEK resin powder in a laminated manner, arranging quartz fibers on the uppermost layer to finish laying, and compacting to obtain a preformed blank; carrying out compression molding on the preformed blank: heating to 280-320 DEG C from room temperature, carrying out first-stage heat preservation, pressurizing after the first-stage heat preservation is finished, and carrying out first pressure maintaining treatment; the temperature is increased to 390-410 DEG C, second-stage heat preservation is carried out, pressurization is carried out after second-stage heat preservation is finished, and second pressure maintaining treatment is carried out; and heating to 420-435 DEG C, carrying out third-stage heat preservation, and after the third-stage heat preservation is finished, pressurizing and exhausting to obtain the composite material. According to the invention, one-time layering is combined with multi-section heating and other operations to realize blank compression molding, and the obtained composite material is good in interlayer combination and has good mechanical properties and wave-transparent properties.

The invention discloses a polyimide composite material and a preparation method thereof, and relates to the technical field of functional composites.The polyimide composite material is composed of hollow quartz fibers and silicon-containing polyimide resin, the fiber volume content of the polyimide composite material is 45%-60%, and the density of the polyimide composite material is 1.25-1.55 g / cm < 2 >; wherein the silicon-containing polyimide resin is formed by polymerizing a mixture of aromatic dianhydride, aromatic diamine and diamine containing a siloxane structure, and an end-capping reagent. The preparation method comprises the following steps: synthesizing a polyamide acid solution, preparing a prepreg by preimpregnation, performing by a vacuum bag method, performing hot-pressing curing and performing high-temperature post-treatment. Through collaborative innovation of the components and the process, the preparation method is simple, and the composite material has ultralow density, ultrahigh heat resistance, low dielectric constant and high strength and is suitable for the fields of aerospace, 5G communication, semiconductors and the like.

The invention discloses a quartz fiber with an yttrium oxide coating and a preparation method of the quartz fiber, and belongs to the field of preparation of wave-transparent ceramics. Aiming at the problem that the performance of the existing quartz fiber is reduced at a high temperature, the invention provides the preparation method of the quartz fiber with the yttrium oxide coating, which comprises the following steps: impregnating the quartz fiber by using yttrium oxide sol, and drying and sintering the impregnated quartz fiber to obtain the quartz fiber coated with the yttrium oxide coating on the surface; the preparation process of the yttrium oxide sol comprises the following steps: sequentially adding a coordination agent and a stabilizer into a yttrium nitrate solution, stirring and dissolving to form a mixed solution, adding a pH regulator to adjust the pH value of the mixed solution to 7-8, heating to a target temperature, and cooling to obtain the yttrium oxide sol. The yttrium oxide coating covers the surface of the quartz fiber, so that the high-temperature sintering resistance of the quartz fiber can be greatly improved; the preparation process of the yttrium oxide sol is simple in technology and low in cost, the prepared yttrium oxide sol is good in stability and can be better attached to the surface of the quartz fiber, and the dipping effect is improved.

The invention discloses a cable with a co-extrusion self-foaming ceramic fireproof layer and a preparation method of the cable, and belongs to the technical field of polyolefin cables. The cable comprises a conductor, an insulating layer and a fireproof layer from inside to outside, comprising the following raw materials: 40-60 parts of an ethylene-vinyl acetate copolymer, 20-40 parts of a polyolefin elastomer, 20-30 parts of a ceramic precursor filler, 5-10 parts of a compatilizer, 5-10 parts of a cosolvent, 3-5 parts of a flexibilizer, 2-4 parts of a main foaming agent, 1-2 parts of an auxiliary foaming agent, 1-3 parts of a lubricant and 0.5-1.5 parts of an antioxidant. The compatilizer is siloxane containing sulfydryl and phosphaphenanthrene groups, and the flexibilizer is silane coupling agent modified quartz fibers containing double bonds. In a matrix of the ethylene-vinyl acetate copolymer and the polyolefin elastomer, the compatilizer and the flexibilizer are added, so that the fireproof layer is endowed with better impact resistance and flame retardance.

The invention discloses a light aviation fire-resistant cable and a preparation method thereof. The light aviation fire-resistant cable comprises a cable core, a shielding layer and a composite sheath layer, wherein the shielding layer and the composite sheath layer sequentially coat the cable core from inside to outside; the cable core comprises an insulating wire core; each insulating wire core comprises a twisted nickel-plated conductor, a fireproof layer and a composite insulating layer, wherein the fireproof layer and the composite insulating layer sequentially wrap the twisted nickel-plated conductor from inside to outside. The fireproof layer comprises quartz fibers, the quartz fiber bundles are wound outside the stranded nickel-plated conductor, and the fireproof layer is formed by high-temperature vulcanization after the quartz fibers are coated with silicone rubber emulsion; the fireproof layer is wrapped by a composite insulating layer. The shielding layer is a nickel-plated round copper wire braided layer; and a composite sheath layer is arranged outside the shielding layer. The cable has the advantages of being long in service life under the high-temperature condition, small in size, light in weight, resistant to high temperature, good in insulation performance, good in environment resistance, resistant to vibration and impact and the like.

The invention discloses a system for detecting and analyzing water-soluble heavy metals in an ecological system based on machine learning. The system is used for detecting water-soluble harmful heavy metal elements in atmospheric particulates. The system comprises a sampling preprocessing module, an electrochemical detection module, a machine learning analysis module and a data verification output module which are connected in sequence, the sampling pretreatment module is used for collecting PM2.5 and PM10 particles by adopting a quartz fiber filter membrane and carrying out dissolving and filtering pretreatment; the electrochemical detection module is used for heavy metal enrichment and detection; the machine learning analysis module adopts an improved CNN (Convolutional Neural Network) to automatically identify the volt-ampere spectrogram, and establishes a nonlinear mapping model of the relationship between the metal ion concentration and the peak current; and the data verification output module performs quantitative analysis by adopting a standard addition method, and compares and identifies the pollution source through a multi-element fingerprint feature database. According to the invention, eight heavy metal elements such as Cd, V, Cr, Ni, Se, As, Mn and Pb can be detected at the same time, the detection range is 0.1-1000 [mu] g / L, and intelligence and automation of heavy metal detection are realized.

The invention belongs to the technical field of wire and cable preparation, and discloses a 1000 DEG C-resistant high-temperature wire and a preparation method thereof.The high-temperature wire comprises a composite conductor, a transition layer, a composite insulating layer and a protective layer from inside to outside, and the preparation method comprises the steps that 1, the composite conductor is prepared; 2, performing magnetron sputtering on a nano aluminum oxide transition layer; 3, preparing a gradient composite insulating layer; and 4, curing the quartz fiber protective layer. The whole high-temperature wire can resist the temperature of 1000 DEG C for long-term operation, the bending fatigue life exceeds 3000 times, compared with a traditional wire, the temperature resistance upper limit is improved by 40%, the occupied space is reduced by 50%, the resistance stability is improved by 6 times, and the high-reliability power transmission requirements under the extreme scenes of aero-engines, nuclear fusion devices, ultra-high-power electric arc furnaces and the like can be met.

The invention discloses a quartz fiber surface modification method and application thereof. The modification method of the quartz fiber comprises the following steps: introducing a low-dielectric polyimide coating on the surface of the quartz fiber, wherein the coating consists of high-heat-resistance non-melting and insoluble polyimide; and nano silicon dioxide microspheres with hollow mesoporous structures are introduced to form a rough surface in the polyimide coating, so that the chemical polarity and roughness of the surface of the quartz carbon fiber are jointly improved. According to the method, on the basis that the dielectric property of the quartz fiber is not reduced, the CTE mismatching between the quartz fiber and the resin is remarkably improved, the interface adhesion strength after cold and hot cycling is improved, the excellent dielectric property of the quartz fiber and the high heat resistance of the polyimide resin are fully played, and the method is suitable for continuous and large-scale production and has wide application prospects. And particularly, the composite material can meet the strict requirements of the modern aerospace industry on light weight, high strength, low dielectric, low water absorption and thermal cycling impact resistance of the composite material.

The invention provides a nano sizing agent reinforced quartz fiber cloth composite material and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method comprises the following steps: shearing and dispersing a surfactant, a solvent and nano hydrophobic particles to obtain a nano sizing emulsion; depositing the nano sizing emulsion on the surface of the quartz fiber cloth by using an aerosol deposition method; and finally, carrying out hot press molding on the modified quartz fiber cloth and a resin matrix to obtain the composite material. The hydrophobic property of the modified quartz fiber cloth obtained by the method is improved, and the contact angle between the modified quartz fiber cloth and water drops can reach 161.5 degrees; according to the composite material obtained by modifying the quartz fiber cloth, the interface bonding force of resin and fibers is strong, the mechanical property of the composite material is remarkably improved, and a tensile strength test shows that the flexibility of the composite material is also remarkably improved, and the composite material is not easy to break during stretching and has good mechanical property.

The invention discloses an all-silica optical fiber Fabry-Perot sensor and a manufacturing method. The sensor is composed of a silica optical fiber, a quartz tube, a reflector, an optical fiber tail cable and an optical fiber connector. Wherein the core structure quartz optical fiber, the quartz tube and the reflector are all made of quartz materials, and the quartz optical fiber and the quartz tube are connected through laser welding to form a full-quartz structure, so that maximum thermal expansion coefficient matching is realized, the packaging internal stress of the sensor is reduced, and the working temperature upper limit and the measurement precision are improved. According to the optical fiber sensor, Fabry-Perot interference is formed through reflected light of the end face of the optical fiber and the end face of the reflector, the optical fiber temperature, strain and pressure sensor of a full-quartz structure can be formed by replacing the reflector and changing the connection relation between the reflector and the quartz tube, and the universality is high.

The invention discloses a quartz fiber toughened aluminum-carbon refractory material and a preparation method thereof, and belongs to the technical field of aluminum-carbon refractory materials. The refractory material comprises a main material, quartz fibers and a binding agent, the main material comprises the following components in percentage by weight: 65-70% of sintered tabular corundum particles, 10-15% of sintered tabular corundum fine powder, 5-10% of carbon black, 1-3% of boron carbide, 1-6% of activated aluminum oxide and 4-8% of silicon powder; the addition weight of the quartz fiber is 0.1-0.9% of the weight of the main material; the adding weight of the binding agent is 3-5% of the weight of the main material. The preparation method comprises the following steps: heating and uniformly mixing carbon black, boron carbide, activated aluminum oxide, silicon powder, quartz fibers and a part of binding agent in a closed strong stirrer, adding the rest raw materials, mixing, kneading, ageing, mechanically pressing, drying, and carrying out segmented heat preservation and heat treatment in a carbon-buried atmosphere, thereby obtaining the high-strength silicon-carbon composite material. And finally, the aluminum-carbon refractory material with high strength, good toughness, excellent thermal shock resistance and long high-temperature service life is prepared.

This invention belongs to the field of glass fiber and composite material preparation technology, and provides a quartz glass fiber cloth and its preparation method. High-purity quartz sand is melted at high temperature to form quartz glass liquid, which is then drawn into continuous quartz fiber bundles through a platinum-rhodium alloy spinneret. The fiber bundles are then acid-washed and pre-baked at low temperature to improve fiber purity and stability. The fiber bundles are coated with sol and doping solution through a dual-channel spinning coating process, followed by drying and sintering to form quartz glass fibers. The fibers are then wound, spun, twisted, and braided to obtain a fiber cloth preform, which is finally sintered at high temperature in an inert atmosphere to form a quartz glass fiber cloth with excellent properties.

The invention belongs to the technical field of heat-conducting composite materials, and discloses a heat-conducting composite material which is a quartz fiber felt matrix reinforced epoxy resin composite material. The epoxy resin composite material is prepared from the following components in parts by mass: 100 parts of epoxy resin, 20 to 80 parts of epoxy group grafted aluminum oxide microspheres, 10 to 50 parts of hydroxyl-rich boron nitride nanosheets, 4 to 10 parts of a curing agent and 0.3 to 1 part of an accelerant. The surface modifier with an epoxy functional group is adopted to eliminate the interface thermal resistance of an inorganic micro-nano composite structure (spherical and lamellar) material, the interface strength and fusion of the filler and a resin matrix are improved, the heat conductivity coefficient of the composite material can be efficiently improved, and the composite material shows high insulating property and mechanical property.

The invention belongs to the technical field of material science, and discloses a cyanate ester / quartz fiber mechanical property optimization method based on machine learning and a related device. Recommending a tensile modulus target and a tensile strength target of the cyanate ester corresponding to the tensile strength target of the cyanate ester / quartz fiber composite material; utilizing a trained machine learning model to recommend components and process parameters of the cyanate ester corresponding to the tensile modulus target and the tensile strength target of the cyanate ester; and screening the recommended components and process parameters of the cyanate ester to obtain the components and process parameters of the cyanate ester corresponding to the tensile strength target of the cyanate ester / quartz fiber composite material. According to the method, limited production line data can be utilized, the experiment frequency and cost are reduced, the cyanate performance is rapidly optimized, and then the high-performance composite material is obtained.

The invention discloses modified quartz fiber cloth, a high-frequency copper-clad plate as well as a preparation method and application of the high-frequency copper-clad plate, and belongs to the technical field of copper-clad plates. The modified quartz fiber cloth comprises quartz fiber cloth and a rough layer positioned on the surface of the quartz fiber cloth, and the rough layer is formed by stacking nano silicon dioxide particles. The preparation method of the modified quartz fiber cloth comprises the following steps: soaking quartz fiber cloth in silicon dioxide sol, then drying, soaking in a coupling agent, and then drying. The copper-clad plate containing the modified quartz fiber cloth and a fluorine-containing resin functional layer has high interlayer binding force, layering or degumming can be effectively avoided, and the high-frequency copper-clad plate can meet the requirements for heat conduction, low dielectric loss and high peel strength at the same time.

The present invention discloses a method for preparing a quartz optical fiber sample for electronic probe testing, which includes an optical fiber carrier provided with an optical fiber groove matching the optical fiber to be tested. The preparation method includes the following steps: firstly, judging the diameter of the optical fiber to be tested, selecting an appropriate cutter for cutting, and during cutting, the optical fiber cutting angle is not greater than 1.5°; selecting an optical fiber carrier adapted to the diameter of the optical fiber to be tested, and transferring the cut optical fiber to be tested to the optical fiber groove of the optical fiber carrier adapted to the optical fiber carrier; pushing the optical fiber to be tested from the cut end face of the optical fiber to be tested so that the cut end face of the optical fiber to be tested is flush with the upper end face of the optical fiber carrier; using a conductive tape to stick across the entire end face of the optical fiber carrier provided with the optical fiber to be tested, and the sticking position of the conductive tape is set lower than the end face of the optical fiber carrier; placing the optical fiber carrier with the optical fiber stuck thereon into a vacuum carbon coating instrument for carbon coating.

The invention relates to the technical field of cable manufacturing, and discloses a heat insulation cable and a preparation method thereof. The cable comprises a cable core, a heat insulation layer, a belting layer and a sheath layer which are sequentially arranged from inside to outside, the cable core comprises a conductor and an insulating layer which are sequentially arranged from inside to outside; the heat insulation layer is made of heat insulation glue; the belting layer is composed of quartz fibers; the sheath layer is composed of porcelain silicone rubber. The heat insulation glue comprises the following components in parts by weight: 80-90 parts of aggregate, 1-3 parts of an anti-agglomeration agent, 5-10 parts of an adhesive, 1-5 parts of a reinforcing phase, 0.1-1 part of a dispersing agent, 0.1-0.5 part of a defoaming agent and 0.1-0.5 part of a thickening agent. The heat insulation layer of the cable is of a porous structure, heat conduction can be effectively prevented, the reinforcing fibers can enable the glue solution to form a three-dimensional net-shaped structure, and the heat insulation effect is improved. The heat insulation layer has the advantages of good heat insulation performance, simple construction, low cost, environmental protection and simple preparation method, and can effectively reduce the working temperature of the cable by coating the cable core with the heat insulation layer.

The invention relates to an in-situ nanowire skeleton reinforced aerogel composite material and a preparation method thereof. The preparation method comprises the following steps: in-situ growth of a nanowire skeleton from quartz fiber felt, preparation of silica sol, sol impregnation and aging, and supercritical drying. The internal pores of the prepared nanowire skeleton reinforced aerogel composite material are refined and segmented by an in-situ grown nanowire network, the interface bonding of nanowires and aerogel is improved through interlocking, fracture under the action of external force is prevented, the structural performance of the aerogel composite material is improved, and the performance of the aerogel composite material is improved. The high-temperature-resistant and low-thermal-conductivity nanowire porous framework composite silicon oxide aerogel thermal insulation material is prepared by a simple and controllable process.

The invention relates to the technical field of thermal protection composite materials, in particular to a thin-wall gradient thermal protection structure and application. The thermal protection structure sequentially comprises, along a thickness direction, an outer surface layer; the ablation-resistant layer is composed of at least one layer of quartz fiber cloth, and the distance d between the outer side face of the quartz fiber cloth and the outer surface layer is larger than 0 mm and smaller than or equal to 0.3 mm; the heat insulation layer is positioned on the inner side of the ablation-resistant layer; the total thickness of the thermal protection structure is smaller than or equal to 5 mm, and the overall density of the thermal protection structure is smaller than or equal to 0.6 g / cm. According to the thin-wall gradient thermal protection structure, under the extreme lightweight constraint that the thickness is smaller than or equal to 5 mm and smaller than or equal to 0.6 g / cm < 3 >, the extra thermal insulation gain larger than or equal to 5% is obtained through the principle of gradient layering and millimeter-level near-wall ablation resistance.

The present invention relates to an organic-inorganic hybrid thermal protection material resistant to discrete interval gas ablation, as well as its preparation method and application. The material comprises an inner layer of low-density composite material and a surface high-density organic-inorganic hybrid composite material. The inner layer of low-density composite material comprises a micron-porous pure phenolic aerogel as a matrix and a quartz fiber preform as a reinforcement, while the surface high-density organic-inorganic hybrid composite material comprises an organic-inorganic hybrid nanoporous phenolic aerogel as a matrix and a carbon fiber preform as a reinforcement. Compared with the prior art, the organic-inorganic hybrid thermal protection material prepared by the present invention has the advantages of low linear ablation rate, lightweight thermal insulation, and low residue generation during ablation in a discrete interval gas ablation environment. It can be applied to internal insulation structures such as gas pipelines and valve cavities of attitude and orbit control engines with discrete interval startup.

The present invention discloses a method for preparing a multilayer gradient absorbing material. The preparation method comprises the following steps: 1) preparing a quartz fiber dispersion; 2) preparing quartz fibers; 3) preparing a quartz fiber composite aerogel; 4) preparing a carbon fiber composite aerogel; and 5) assembling the material. The present invention proposes a green, convenient, and low-cost process for preparing a multilayer gradient absorbing material with excellent absorbing properties. Flexible quartz fiber aerogel, quartz fiber composite aerogel, and carbon fiber composite aerogel are prepared separately. By combining these materials, a gradient impedance design is achieved, thereby enhancing the material's absorbing properties. This solves the problem of poor absorbing performance of a single material or structure. The proposed method for preparing an ultra-light, flexible multilayer absorbing material has low production costs, short processing time, and strong operability, making it suitable for mass production. Importantly, this material exhibits excellent flexibility, electromagnetic wave absorption, and thermal insulation properties, and is expected to be used in various fields, including next-generation stealth aircraft and portable electronic devices.

The application provides a kind of co-woven three-dimensional interpenetrating network reinforced aerogel composite material and its preparation method and application.The composite material is composed of reinforced phase and matrix phase, the reinforced phase is three-dimensional interpenetrating network fiber felt prepared by integrated weaving or needling process, containing hollow fiber and solid quartz fiber, which are interpenetrated and entangled in three-dimensional space to form a continuous network skeleton;The matrix phase is silica-based aerogel filled and coated network pores.The preparation method includes the steps of forming, sol impregnation, gelation and aging, supercritical drying and other steps of co-woven preform, and can also include hydrophobic post-processing.The material has the characteristics of light weight, high strength, ultra-low thermal conductivity and excellent wave-transparent performance, and is suitable for hypersonic aircraft radome, antenna window, radar fairing and satellite communication wave-transparent components, which can meet the requirements of load bearing, heat insulation and wave-transparent integration.

The invention discloses a compression molding method for a chopped quartz fiber reinforced PEEK resin-based wave-transparent radome. The method comprises the following steps: preparing and drying a premix; the premix is added into a mold cavity in batches in a pre-pressing mode; and carrying out compression molding on the premix. According to the PEEK resin temperature characteristic, integrated compression molding is carried out under the conditions of multi-stage heating and stage progressive pressurization, and the obtained composite material has the antenna housing appearance and also has good mechanical property and wave-transparent property; the forming mode is simple, and the production cost and period can be greatly reduced under the condition that the use requirements are met.

The present invention relates to a variable diameter braiding method for quartz fiber sleeves, and belongs to the technical field of quartz fiber sleeve braiding. The present invention utilizes an existing sleeve braiding machine to achieve the integrated molding of fiber sleeves of different diameters, thereby solving the problem that existing sleeves have only one set diameter size and cannot adapt to the set of variable diameter products. At the same time, it solves the problem that the strength of the seam area caused by the segmented sewing and assembly method of the existing fiber sleeves cannot be guaranteed. The quartz fiber sleeve braided by the present invention ensures the integrity of the set material and does not have the problem of seams. On the other hand, the quartz fiber sleeve braided by the present invention is a coaxial variable diameter sleeve fabric, which has the characteristics of quartz fiber continuity and sleeve structural integrity.

The invention provides an engine medicine baffle assembly and a preparation process, the engine medicine baffle assembly comprises a metal base, the metal base is provided with a medicine baffle buffer layer, and the medicine baffle buffer layer is prepared from the following raw materials: liquid silicone rubber, a flexibilizer, silica powder, zirconium boride, carbon fibers, quartz fibers and polyimide fibers. According to the process, integrated compression molding of the medicine baffle assembly of the engine is achieved through a special mold. The invention provides the silicone rubber-based explosive baffle assembly with good comprehensive performance and mold pressing fluidity, and reliable support for the explosive column and the ignition device can be realized. According to the engine medicine baffle assembly, the problems that in the prior art, when a medicine baffle buffer layer is made of organic materials such as polyurethane and ethylene propylene diene monomer or inorganic coatings such as silicate and zirconium oxide, the steps are tedious, the material performance cannot meet the requirement, or the cost is high are effectively solved.