771results about How to "Guaranteed mechanical properties" patented technology

The invention belongs to the technical field of polymer plastic materials, and particularly relates to a high-temperature-resistant anti-corrosion polytetrafluoroethylene material and a preparation method thereof. The polytetrafluoroethylene is prepared from the following raw materials in parts by weight: 50 to 60 parts of polytetrafluoroethylene, 5 to 10 parts of fluorinated modified graphene oxide, 3 to 5 parts of aluminum powder, 5 to 8 parts of modified silicon carbide fiber, 3 to 5 parts of silane modified nano silicon dioxide, 2 to 3 parts of polyphenylene sulfide, 2 to 3 parts of polyimide, 0.5 to 0.8 part of dispersing agent and 0.5 to 1 part of antioxidant. The heat conduction performance and the interface bonding force are improved through the fluorinated modified graphene oxide, the impact resistance and the wear resistance are enhanced through the silicon carbide fibers, and the corrosion resistance and the wear resistance are improved through the aluminum powder; silane modified silicon dioxide enhances the mechanical property of the composite material by improving the dispersity of the filler, and PPS and PI interact with the surface of the filler through polar groups in molecular chains, so that the interface strength is improved, and the toughness and the thermal stability are improved.

The invention discloses low-carbon high-freezing-resistance magnesium phosphate cement mortar and a preparation method and application thereof, and belongs to the technical field of constructional engineering materials, the mortar comprises low-carbon magnesium phosphate cement, river sand, hydrolyzed silanol and mixing water; the hydrolyzed silanol is a product obtained by hydrolyzing a silane coupling agent in ethanol and water under an acidic condition; the invention relates to a high-strength concrete, which is prepared from the following formula components in parts by mass: 145 to 250 parts of low-carbon magnesium phosphate cement, 145 to 250 parts of river sand, 7 to 35 parts of silane coupling agent, 42 to 210 parts of ethanol, 21 to 105 parts of water and 10 to 30 parts of water for mixing. The cement has the advantages of adjustable setting time, low carbon, energy conservation, good mechanical properties, strong water resistance and freezing resistance and the like.

The invention relates to a copper-steel composite plate and a preparation method thereof, the copper-steel composite plate comprises an outer layer carbon steel plate and a core layer oxygen-free pure copper plate, and at least one surface of the oxygen-free pure copper plate integrally and continuously covers the carbon steel plate; the carbon steel plate comprises the following chemical components: 0.05%-0.20% of C, 0.1%-0.55% of Si, 0.5%-2.0% of Mn, less than or equal to 1.0% of Cr, less than or equal to 1.5% of Ni, less than or equal to 1.0% of Cu and the balance of Fe. The thickness of the copper-steel composite plate is 30-120 mm, and the ratio of the thickness of the oxygen-free pure copper plate to the thickness of the copper-steel composite plate is 0.4-0.8. According to the copper-steel composite plate, the yield strength is larger than or equal to 209 MPa, the tensile strength is larger than or equal to 359 MPa, the shear strength is larger than or equal to 213 MPa, and the copper-steel composite plate has good structural strength and interface bonding strength.

The coarse aggregate ultra-high performance concrete premix lifting, transferring and mixing device comprises a control system, an aggregate batching system, an aggregate lifting system, a dry mixing main machine system, a feeding vehicle, a steel fiber feeding system and a stirring system, the whole stirring process is automatically controlled and comprises key steps of automatic metering, automatic raw material feeding, mixing and the like, so that manual operation is remarkably reduced, errors and inconsistency caused by manual metering are avoided, and the accuracy and repeatability of stirring each time are ensured; step-by-step feeding of each part is coordinated through a control system, so that the stirring efficiency and the uniformity of concrete are improved; by establishing a relational expression between a concrete mixture stirring uniformity index and parameters such as the stirring time, the stirring speed, the number of stirring blades, the vibration frequency of the two-stage vibrating screen and the like, key parameters in the stirring process are more accurately controlled, and it is ensured that the stirring uniformity of each batch of concrete reaches a preset standard.

The invention relates to the technical field of fire extinguishing materials, and discloses an active fire extinguishing microcapsule, a preparation method and application thereof, an ultraviolet curing resin plate and a preparation method thereof. The microcapsule has a core-shell structure, a core material is perfluoro (2-methyl-3-pentanone) (PFMP), and the microcapsule is used as an efficient fire extinguishing agent and is suitable for inhibiting the heat rise rate of an ultraviolet curing polymer in thermal runaway and fire scenes; and the shell layer is a polymer wall material formed by gelatin, has a certain thickness and can be broken at a preset temperature. Through simple condensation, PFMP is used as a core material for microencapsulation, and the microcapsule with specific particle size distribution is prepared, so that the microcapsule can quickly release a fire extinguishing agent under a high-temperature condition, and flames are effectively inhibited.

The invention discloses an anti-pollution flashover coating with arc durability, which comprises the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 10-25 parts of dimethyl silicone oil, 5-15 parts of a phosphorus flame retardant, 8-20 parts of white carbon black, 5-15 parts of modified mica powder, 15-30 parts of modified calcium carbonate, 10-20 parts of modified glass powder, 5-12 parts of aluminum hydroxide, 5-10 parts of 1, 3-butanediol, 5-10 parts of a flame retardant, 1-5 parts of an anti-aging agent, 1-5 parts of an anti-aging agent, and 1-5 parts of an anti-aging agent. The invention discloses a high-temperature-resistant coating which is prepared from the following components in parts by weight: 0.5-2 parts of 1, 2-bis (trimethoxysilyl) ethane, 5-10 parts of potassium titanate whiskers, 2-6 parts of color paste, 50-150 parts of a solvent, 3-10 parts of a cross-linking agent, 2-6 parts of a silane coupling agent and 1-5 parts of a catalyst. The invention also provides a preparation method of the anti-pollution flashover coating with arc durability. By introducing the modified mica powder, the modified glass powder and the modified calcium carbonate with specific particle sizes and reasonable gradation, the proportion of the filler in the base rubber is ensured, so that the modified mica powder, the modified glass powder and the modified calcium carbonate form a compact and firm ceramic high-temperature-resistant and arc-resistant layer after encountering high temperature of an arc; and the purpose of improving the arc durability is achieved.

The invention relates to a steel bar for an automobile transmission shaft based on an ecological electric furnace and a production method. The steel bar for the automobile transmission shaft comprises the following chemical components: 0.18-0.22% of C, 0.22-0.33% of Si, 0.85-1.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 1.05-1.20% of Cr, less than or equal to 0.25% of Ni, less than or equal to 0.10% of Mo, 0.05-0.09% of Ti and less than or equal to 0.15% of Cu. And the balance of Fe and impurities. The production process comprises the steps of ecological electric furnace smelting, LF refining, RH refining, continuous casting, casting blank heating, rolling, heat preservation and heat treatment. According to the invention, a smelting continuous casting process of'ecological electric furnace + LF + RH + continuous casting 'is adopted, and is matched with a proper rolling process, so that the steel bar for the automobile transmission shaft, which is high in steel purity and excellent in mechanical property and surface quality, is produced, and the requirements of high-end products can be met.

The invention belongs to the technical field of civil engineering materials, and particularly relates to a coal gangue-based solid waste cementing material as well as a preparation method and application thereof. The coal gangue-based solid waste cementing material is prepared from the following raw materials in percentage by mass: 60-80% of activated coal gangue powder, 5-20% of an exciting agent, 5-15% of superfine slag powder, 2-5% of silica fume, 1-3% of gypsum and 1-3% of fan blade short fibers. According to the invention, solid waste resources (coal gangue and superfine slag powder) are recycled, and on the basis of consumption of the solid waste resources, the coal gangue-based solid waste cementing material obtained by using the solid waste resources has good mechanical properties and durability, and can meet the use requirements of highway engineering base layers.

The invention relates to the technical field of photovoltaic packaging materials, and discloses a black high-reflection infrared integrated packaging material and a preparation method thereof, and the black high-reflection infrared integrated packaging material comprises a bonding packaging layer, a light management layer, a mechanical transition layer and an insulating supporting layer which are arranged from top to bottom; all the layers are subjected to integrated melting and co-extrusion to obtain the packaging material; the first melting point of the bonding packaging layer is 70-100 DEG C, the second melting point of the bonding packaging layer is 110-130 DEG C, and the content of the cross-linked gel after irradiation is 5-30%; the melting point of the light management layer is 70-130 DEG C, the light management layer comprises a perylene black surface layer and a white light reflecting layer which are sequentially arranged, the visible light absorptivity of the perylene black surface layer is larger than or equal to 90%, and the infrared light transmittance of the perylene black surface layer is larger than or equal to 50%; the melting point of the mechanical transition layer is 90-130 DEG C; and the melting point of the insulating support layer is 120-180 DEG C. According to the invention, the high transmittance of infrared light is maintained while the deep black appearance is realized, the secondary absorption of the infrared light can be realized, and the overall efficiency of the assembly is improved.

The invention discloses a forming method of an ultra-high molecular weight polyethylene strip, which comprises the following steps: step 1, mixing ultra-high molecular weight polyethylene resin and a low molecular weight solvent to prepare a uniform suspension, then extruding at high temperature, and cooling and shaping to obtain a gel film; step 2, carrying out single-axis high-temperature ultra-time hot stretching on the gel film; 3, extracting the stretched gel film to remove the low-molecular-weight solvent, and drying with hot air to obtain a dried film; 4, longitudinally cutting the dry film to form strips; and step 5, carrying out low-multiple uniaxial thermal stretching on the strip to remove pores so as to obtain the final ultra-high molecular weight polyethylene strip. The gel film is subjected to uniaxial hot stretching under the condition that a low-molecular-weight solvent is not removed, and the low-molecular-weight solvent is beneficial to promoting orientation of fibrous extended-chain crystals reserved in the gel film and formation of high-orientation crystals such as subsequent extended-chain crystals, so that the tensile mechanical property and other properties of a final strip are improved.

The invention relates to a full-biodegradable polyester composite material and a heat shrink film thereof. Corn starch, PBAT and PLA are used as main raw materials, glycerin, water and polyethylene glycol-6000 are used as composite plasticizers, B225 is used as an antioxidant, and solid paraffin and oleamide are used as lubricants. The preparation method comprises the following steps: adding corn starch, glycerol, water, PEG-6000, B225, solid paraffin and oleamide into a high-speed mixer, stirring to obtain plasticized corn starch, adding PBAT and PLA into the high-speed mixer, mixing with the plasticized corn starch, stirring, discharging, putting into an extruder, extruding and granulating to obtain a full-biodegradable polyester composite material, and extruding and blowing to obtain the thermal shrinkage film. The polyester composite material prepared by the invention can be biodegraded under the condition of matured compost, the biodegradation rate is 91.22%, the relative biodegradation rate is 96.55%, and products are carbon dioxide and water and meet the GB / T 41010-2021 standard requirements.

The invention relates to the field of textile processing, and discloses a polyester knitted fabric flame-retardant finishing method, which is characterized in that modified waterborne polyurethane emulsion is finished on a washed and dried polyester knitted fabric by using a dipping and drying method; the modified waterborne polyurethane emulsion is prepared from isophorone diisocyanate, an amine chain extender, a flame-retardant cross-linking agent, modified nano titanium dioxide and the like, and the amine chain extender is prepared from 2-(2, 4-dihydroxyphenyl)-2H-benzotriazole and 2-chloro-4, 6-diamino-1, 3, 5-triazine through a reaction; the flame-retardant cross-linking agent is prepared from 1, 3, 5-tri (2-hydroxyethyl) cyanuric acid and dimethyl methylphosphonate through a reaction; the modified nano titanium dioxide is prepared from modified silane coupling agent modified nano titanium dioxide hybrid silica sol obtained by reaction of tetramethyldisiloxane and vinyltrimethoxysilane, so that the material is endowed with good flame retardant property, the ultraviolet protection property of the material is improved, and the mechanical property of the material is ensured.

The invention provides a degradable biological membrane and a preparation method thereof. The degradable biological membrane is prepared from the following raw materials in parts by weight: 60-70 parts of PBAT, 30-40 parts of PLA, 5-10 parts of microcrystalline cellulose composite modified particles, 0.5-2 parts of a chain extender, 1-2 parts of a coupling agent, 0.5-1 part of an anti-hydrolysis agent and 0.5-1 part of an antioxidant. The degradable biological membrane is obtained through the working procedures of mixing, extrusion granulation, curtain coating cooling, two-way stretching and the like. Wherein the microcrystalline cellulose is modified through the procedures of carboxylation, cross-linking, monohydroxyl end-capping grafting and the like at a specific degree to prepare composite modified particles, so that the degradable biological membrane has good mechanical properties and waterproof and breathable functions.

A composite material combined layer wall plate structure suitable for combined connection of wings comprises a main box section skin and a plurality of reinforcing ribs which are integrally cured and formed, the front edge and the rear edge of the main box section skin are sequentially provided with recesses, and a front sunken edge for lap joint of the front edge skin and a rear sunken edge for lap joint of the rear edge skin are formed; a front beam reinforcing rib used for being connected with a front spar web is fixedly arranged at the bottom of the transition area of the front sunken edge and the main box section skin body, and a rear beam reinforcing rib used for being connected with a rear spar web is fixedly arranged at the bottom of the transition area of the rear sunken edge and the main box section skin body. The connecting mode of the wall plate and a related structure is simplified, the number of parts is reduced, the assembling efficiency can be improved, and dismounting, replacing and maintaining of an airplane in the using and maintaining process are facilitated.

The invention relates to the technical field of preparation and application of multi-element synergistic flame retardants, in particular to a DOPO-based phosphorus-nitrogen-sulfur synergistic flame-retardant compound as well as a preparation method and application thereof. The preparation method of the DOPO-based phosphorus-nitrogen-sulfur synergistic flame-retardant compound comprises the following steps: (1) reacting 2-amino-1, 3, 4-thiadiazole with p-methylsulfonylbenzaldehyde to synthesize a Schiff base intermediate, and (2) adding DOPO to perform a phosphorus-hydrogen addition reaction to synthesize the DOPO-based phosphorus-nitrogen-sulfur synergistic flame-retardant compound. The DOPO-based phosphorus-nitrogen-sulfur synergistic flame-retardant compound is synthesized by adopting a one-pot method, and the reaction method is simple and efficient; besides, the DOPO-based phosphorus-nitrogen-sulfur synergistic flame-retardant compound has a multi-element (P, S and N) synergistic flame-retardant effect, the flame retardance of the epoxy resin can be remarkably improved, meanwhile, high transparency and stable mechanical properties of the epoxy resin can be kept, and the compound can be expanded to application in optical electronic products.

The invention relates to the technical field of advertisement display, decorative materials and environment-friendly materials, in particular to a degradable advertisement inkjet film and a preparation method thereof.The degradable advertisement inkjet film comprises a glittering ink absorption layer, a degradation starting layer and a main body layer arranged between the glittering ink absorption layer and the degradation starting layer; 1%-2% of an ultraviolet light absorber; and the like. According to the degradable advertisement jet drawing film, by means of the three-layer structural design, the perfect combination of the advertisement effect and environment-friendly degradation is achieved, the flash ink absorption layer provides the unique visual effect, meanwhile, the graphene nanosheet modified titanium oxide photocatalytic layer can catalyze the degradation process under illumination, the main body layer guarantees the mechanical and printing performance of the film, and the degradable advertisement jet drawing film has the good application prospect. And the degradation starting layer realizes rapid degradation through a microbial enzyme complex, and particularly, the graphene nanosheet modified titanium oxide photocatalytic layer is used as a key technology, so that the degradation rate of the advertisement film is remarkably improved.

The invention provides an antistatic polypropylene material as well as a preparation method and application thereof, and belongs to the technical field of polypropylene materials. The preparation method comprises the following steps: modifying graphene, preparing a graphene / titanium dioxide compound, reacting, and performing extrusion molding. The method comprises the following reaction steps: putting a functionalized graphene / titanium dioxide compound into a reaction container, introducing N, N-dimethylformamide, uniformly stirring, adding modified graphene, dicyclohexylcarbodiimide and 4-dimethylaminopyridine, heating to 73-77 DEG C, carrying out ultrasonic treatment, and after ultrasonic treatment is finished, carrying out heat preservation stirring for 1.8-2.2 hours to obtain the graphene / titanium dioxide composite material. Then heating to 116-123 DEG C at the speed of 1.7-2.3 DEG C / min, stirring for 1.8-2.2 hours while keeping the temperature, after stirring is finished, filtering, washing, freeze-drying, and naturally recovering to room temperature, so as to obtain a graphene-graphene / titanium dioxide compound; the antistatic polypropylene material prepared by the invention is good in antistatic property, excellent in mechanical property and good in aging resistance.

The invention discloses an assembly type reinforcing structure and method for improving the anti-penetration explosion protection performance of a dam. The reinforcing structure comprises a bottom limiting structure, side limiting structures arranged on the two sides of the bottom limiting structure and a plurality of ultra-high-performance concrete precast blocks assembled in an area defined by the bottom limiting structure and the side limiting structures. The bottom limiting structures and the side limiting structures are fixedly connected with a dam body of the dam, and ultra-high-performance concrete is poured at abutted seams between the adjacent ultra-high-performance concrete precast blocks, between the ultra-high-performance concrete precast blocks and the side limiting structures and between the ultra-high-performance concrete precast blocks and the bottom limiting structures for connection. According to the fabricated reinforcing structure and method, the ultra-high performance concrete precast blocks are assembled in a sliding-in mode, and high-resistance rapid reinforcing of the dam can be achieved.

The invention relates to a medical titanium-zinc alloy and a preparation method and application thereof.The medical titanium-zinc alloy comprises a porous pure titanium support and a pure zinc block, and the interior of the porous pure titanium support is of a three-dimensional intercommunication structure; and the pure zinc blocks are filled into gaps of the porous pure titanium bracket in a metal infiltration manner to form the titanium-zinc alloy material. According to the invention, through 3D printing of the pure titanium porous scaffold, the designed intraosseous fixation device promotes the osteogenesis performance in a living body by utilizing the biological activity characteristic of pure zinc metal; meanwhile, the pore diameter of the pure titanium porous scaffold is adjustable, so that the mechanical properties of different medical materials can be met. In addition, in the implanting process, the growth speed of bones can be better matched with the degradation speed of zinc; and finally, after implantation, along with continuous degradation of a zinc-containing phase in the material in an in-vivo environment, formation of a new bone is gradually induced, the new bone grows into a porous structure, and finally a titanium-bone interlocking structure is formed, so that the bonding strength between a bone tissue and an implant is improved.

The invention belongs to the technical field of power supply cable design and processing, and particularly relates to a high-thermal-conductivity multi-layer structure cable which comprises an insulation shielding wire core, and the insulation shielding wire core comprises a conductor wire core, an insulation layer tightly wrapping the conductor wire core and a shielding layer tightly wrapping the insulation layer. The cable further comprises an outer sheath layer tightly wrapping the insulation shielding wire cores. Wherein modified heat-conducting carbon fibers are dispersed and doped in the outer sheath layer, and stable chemical connection exists between the heat-conducting carbon fibers, so that improvement of the heat conduction effect of the sheath is facilitated; and the insulating layer and the outer sheath layer are formed by melting a resin mixture, directly extruding the resin mixture on the surface of the inner layer and then cooling, so that the contact tightness between the layers is ensured, and the continuity of heat conduction is ensured.

The invention discloses a production and preparation method of a high-temperature-resistant steel bar for an automobile axle, and the high-temperature-resistant steel bar comprises the following chemical components in percentage by mass: 0.39-0.42% of C, 0.22-0.30% of Si, 1.45-1.70% of Mn, less than or equal to 0.015% of P, less than or equal to 0.006% of S, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.05% of Mo, less than or equal to 0.10% of Cu and the balance of iron and inevitable impurities. Comprising the steps of ecological electric furnace smelting, LF refining, RH refining, continuous casting, annealing process, heating process, rolling process and heat preservation process. The quality requirement of the steel bar for the automobile axle is met, and the indexes such as the mechanical property and the high steel purity can also meet the standard requirement.

The invention discloses a modified asphalt composition, a preparation method thereof and a modified asphalt waterproof coiled material. The modified asphalt composition comprises the following raw material components in parts by weight: 40-50 parts of composite asphalt; 8 to 10 parts of softening oil; 5 to 7 parts of SBS (Styrene Butadiene Styrene); 1 to 1.5 parts of carbon fiber; 10 to 15 parts of rubber powder; 1-2 parts of an auxiliary agent; 15 to 25 parts of a filling material; wherein the carbon fibers and the SBS are interwoven to form a modified network, and the mass ratio of the carbon fibers to the SBS is 1: (4-6); the mass ratio of the carbon fibers to the composite asphalt is 1: (27-40); the mass ratio of the carbon fiber to the auxiliary agent is 1: (0.7-2). According to the modified asphalt composition, through the synergistic effect of the composite asphalt, the carbon fibers and the SBS, the mechanical property of the modified asphalt composition is guaranteed, meanwhile, the high-temperature stability of the modified asphalt composition is improved, and the influence on a waterproof material during thermal pavement of a pavement or a bridge deck can be effectively resisted.

The invention discloses a steel plate multi-rolling forming method capable of detecting curvature radius in real time, which can perform simulation process simulation on the rolling working condition of a high-strength thick plate through related technologies, optimize the displacement amount of a driving roller of a plate rolling machine and the plate rolling speed in the multi-rolling forming process, and improve the accuracy of plate rolling forming. And the test paper working procedures in the rolling process of unconventional steel plates such as high-strength thick plates can be greatly reduced. And the stress change of the steel plate in the rolling process can be intuitively seen through a simulation analysis result, so that the quality reliability of a steel plate rolled finished product is ensured. The intelligent degree of large traditional industrial equipment such as a plate rolling machine is improved, the personnel investment in the plate rolling process is reduced, and the rolling efficiency and the forming quality of unconventional steel plates such as high-strength thick plates are improved.

The invention relates to a preparation method and application of a wall coating type enzyme-loaded microchannel reactor. The method comprises the following steps: mixing tetramethyl orthosilicate, methyltrimethoxysilane and methanol to obtain a solution A; deionized water, polyethylene glycol, a sodium fluoride aqueous solution and a dialyzed lipase solution are mixed to obtain a solution B, the solution B and the solution B are mixed for 3-10 minutes in an ice bath environment to obtain a solution C, the solution C is introduced into the pretreated microchannel through an injection pump, after incubation is conducted for 10-60 minutes, nitrogen is adopted for purging, redundant sol-gel is removed, and then the solution C is put into a drying oven to be dried; the catalyst is used for hydrolysis reaction of grease and various ester exchange and esterification reactions. The method can be carried out in a mild environment, and has higher conversion rate and shorter reaction time.

The invention provides an additive repairing method for a stepped hole damage defect on a part, which comprises the following steps of: firstly, removing the stepped hole defect, and preparing a matched filling material according to the size of the removed stepped hole; filling a filling material into the stepped hole, welding and positioning the filling material and the top surface of the base material by adopting laser welding, and ensuring that the filling material does not slide relative to the base material or fly out of the base material during friction stir welding of the static shaft shoulder; then, a static shoulder friction stir welding method is adopted, the filler is extruded, the filler and the base metal are reliably combined, control over welding heat input is achieved, the influence of welding heat on the base metal is reduced, and the problems of air holes, slag inclusion, coarse grains, hot cracks and the like which are prone to occurring in conventional fusion welding repair are solved. And the welding quality is high, and the maintenance cost of parts is saved.

The invention provides a locomotive battery replacement protection system and a battery replacement method. The protection system comprises a battery replacement control switch, a battery locking mechanism and a locomotive parking brake mechanism. The battery replacement control switch controls the on and off of the replacement operation of the battery, and the battery replacement control switch is mechanically interlocked with a power system switch of the locomotive. And the battery locking mechanism can be switched between a locking position and an unlocking position, and the battery changing control switch controls switching of the battery locking mechanism. The locomotive parking brake mechanism is connected with the battery locking mechanism and can be switched between a parking brake releasing position and a parking brake implementing position, and when the battery locking mechanism is located at the locking position, the locomotive parking brake mechanism is located at the parking brake releasing position; and when the battery locking mechanism is in the unlocking position, the locomotive parking brake mechanism is in the parking brake implementation position.

The invention relates to a large-inner-diameter thick-wall inner-step cylindrical forge piece and a preparation method thereof, and belongs to the technical field of forging machining. The preparation method of the large-inner-diameter thick-wall inner-step cylindrical forge piece comprises the steps that S1, a riser presses a jaw, and pre-stretching is conducted; s2, upsetting and drawing out are carried out; s3, upsetting and punching are carried out; s4, drawing out the core rod; s5, overall flattening is carried out; s6, pre-broaching is conducted on the saddle; s7, single-side leveling is carried out; s8, an inner hole step is collected through a collecting table sleeve; and S9, chambering and the like. According to the preparation method, the inner-step cylindrical forge piece with the step height being 200 mm or above and the maximum wall thickness being 1000 mm or above can be successfully prepared, the formability of the obtained inner-step cylindrical forge piece is high, no defect exists, the material utilization rate is high, and the subsequent machining time is shortened.

The invention discloses an anti-aging and anti-yellowing foaming polyester material and a preparation method thereof, and relates to the technical field of polyester materials. The anti-aging and yellowing-resistant foamed polyester material is prepared from the following raw material components in parts by weight: 3 to 5 parts of anti-ultraviolet SEBS (Styrene-Ethylene-Butylene-Styrene), 3.6 to 7 parts of triethylamine, 4 to 6 parts of flame-retardant and wear-resistant filler, 100 parts of TPEE (Thermoplastic Polyether Ester Ether), 0.9 to 1.1 parts of polymer wax and 0.6 to 0.8 part of foaming agent, the anti-ultraviolet SEBS is obtained by copolymerizing and grafting an unsaturated benzophenone ultraviolet absorbent, SEBS and maleic anhydride; the flame-retardant and wear-resistant filler is obtained by mixing and reacting carboxylated nano silicon dioxide, pentaerythritol and phosphorus oxychloride; the polymer wax adopts EVA (Ethylene Vinyl Acetate) wax; azodicarbonamide is adopted as the foaming agent; the anti-aging and anti-yellowing foaming polyester material disclosed by the invention is relatively good in mechanical property, anti-aging property, flame retardant property and compression resistance.

The invention relates to a lightweight gauze for toughening a fiber composite material and a preparation method thereof, belongs to the technical field of toughened gauzes, and solves at least one of the problems that in the prior art, the gauze is easy to dissolve in a resin filling process, the liquid forming effect is poor, the toughening effect is not obvious and the like. The light gauze comprises a low-melting-point component and a high-melting-point component; the melting point range of the low-melting-point component is 100-160 DEG C, and the low-melting-point component and the epoxy resin are insoluble; the melting point range of the high-melting-point component is 300 DEG C or above, and the high-melting-point component is dissolved in the epoxy resin. The light gauze is not easy to dissolve in the resin filling process, so that the manufacturability of automatic laying and liquid forming in the fiber composite material preparation process is improved; the brittleness of the dry fiber composite material is improved, and the mechanical property of the dry fiber composite material is remarkably improved.

The invention relates to an integrated carbon / carbon composite material crucible containing a pyrolytic carbon transition coating, and belongs to the technical field of thermal field parts for monocrystalline silicon. The crucible comprises a carbon / carbon composite material crucible body, a glassy carbon coating, a pyrolytic carbon transition coating and an yttrium oxide coating, wherein the glassy carbon coating not only has a good combination effect with the carbon / carbon composite material crucible body, but also can prevent carbon from escaping; the thermal expansion coefficient of the pyrolytic carbon transition coating is close to that of the glassy carbon coating, and the combination effect of the pyrolytic carbon transition coating and the yttrium oxide coating is good; the yttrium oxide coating has excellent thermal stability and excellent silicon erosion resistance, and can ensure the purity of molten silicon in the single crystal drawing process; the carbon / carbon composite material crucible body is formed by densifying a carbon fiber prefabricated body which is formed by needling and laying a pure net tire sprayed with resin, and the inner surface of the carbon / carbon composite material crucible body is a net tire which is wholly approximately isotropic, so that the overall mechanical strength of the crucible can be ensured, and a good combination effect of the crucible and a subsequent functional coating can also be ensured.