417results about How to "Good workmanship" patented technology

The invention discloses a defective product prediction and early warning method and system for manually assembled motors, and relates to the field of industrial detection, and the method comprises the steps: obtaining a real-time video stream in a motor assembly process, and determining key motion features of a target person according to the real-time video stream; comparing the key action characteristics with a preset standard action template to obtain an action difference degree; according to the tool type, the performance parameter and the use state information of the assembly tool used by the target person, establishing an applicability model of the assembly tool; inputting the key action features into an applicability model to obtain a tool application score of the target person; acquiring real-time pressure data and real-time temperature data of an assembling environment in a motor assembling process, and determining a motor assembling score of a target person; and when the motor assembly score is lower than a preset qualified threshold value, early warning information is sent to a supervision client. By implementing the method, the application degree of the assembly tool by the assembly personnel can be identified, and the defective motor product can be predicted more comprehensively.

The invention discloses a preparation method and application for preparing a cobalt-doped manganese dioxide material by taking Co3 [Co (CN) 6] 2 as a hard template, and belongs to the technical field of electrode material preparation. The preparation method comprises the following steps: firstly, preparing a Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material through a liquid phase coprecipitation reaction method; and then preparing the cobalt-doped manganese dioxide material with a loose porous structure by taking the Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material as a hard template and potassium permanganate as a reaction raw material and adopting a hydrothermal synthesis method, specifically, forming a submicron cube with the size of 200-700nm by combining nanosheets with the thickness of about 10-20nm, and preparing the cobalt-doped manganese dioxide material with the loose porous structure by adopting a hydrothermal synthesis method. And an optimization strategy of Co atom doping of manganese dioxide and nanosheet morphology control is synchronously completed. When the material is used as an electrode material, the conductivity of the manganese dioxide electrode material is greatly improved, the capacity of an aqueous zinc ion battery is improved, and the material has excellent charge-discharge cycle stability.

The invention relates to the technical field of water-based paint, in particular to water-based paint suitable for cement floors and a preparation method thereof.The water-based paint is prepared from, by weight, 60-80 parts of acrylic emulsion, 3-5 parts of N-hydroxyethyl acrylamide, 2-4 parts of modified nano silicon dioxide and 0.1-0.3 part of graphene oxide. The invention relates to an anti-mildew coating, which is prepared from the following components in parts by weight: 1 to 2 parts of polyethylene glycol methyl ether methacrylate, 2 to 4 parts of 2-(dimethylamino) ethyl methacrylate, 0.2 to 0.6 part of defoaming agent, 0.5 to 1 part of flatting agent, 0.3 to 0.6 part of wetting agent, 4 to 10 parts of coalescing agent, 0.5 to 1.5 parts of thickening agent, 0.1 to 0.2 part of anti-mildew bactericide and 20 to 40 parts of filler, the adhesive force of the coating and a cement base material reaches 0 grade, and the performance is kept stable after water soaking resistance; the wear resistance is improved by more than 3 times compared with the traditional water-based paint, and meanwhile, good toughness is kept; and ideal film formation can be realized within the range of 5-40 DEG C.

The invention provides a semiconductor device and a preparation method thereof. According to the preparation method of the semiconductor device, after a silicon germanium groove structure is formed, a sacrificial layer is adopted as a sacrificial medium, and a hard mask layer is formed on the surface of each exposed gate structure so as to fill the height difference of the surfaces of the gate structures. And carrying out planarization treatment on the hard mask layer by adopting a chemical mechanical polishing process, so that the heights of the gate structures are recovered to the same horizontal plane. Based on this, the gate structures with the same height not only are beneficial to carrying out chemical mechanical grinding of a larger window by adopting the same load parameter in the subsequent preparation process, but also are beneficial to etching and cleaning the pseudo gate and fully filling the polycrystalline silicon in the subsequent technological process of removing the pseudo gate and filling the polycrystalline silicon; and a better process effect is ensured, so that ideal key parameters can be obtained, and the device yield is improved.

The invention belongs to the technical field of preparation of boron carbide ceramics, and particularly relates to a method for preparing light boron carbide ceramics by taking coconut shells as raw materials, which comprises the following steps of: performing high-temperature carbonization, crushing, grinding and sieving on the coconut shells as the raw materials to obtain carbon powder, fully evaporating and crosslinking a uniform mixture of the carbon powder, boric acid and trihydroxymethyl aminomethane to obtain gel, and drying the gel to obtain the light boron carbide ceramics. According to the preparation method, the gel is converted into precursor powder by using a combustion method, and finally, the porous boron carbide ceramic is obtained through dry pressing molding and high-temperature sintering, so that the two processes of boron carbide powder preparation and pore forming are integrated, the preparation process flow of the light boron carbide ceramic is effectively simplified, and the efficiency is improved.

The invention discloses a water-soluble phosphonated polybenzimidazole polymer and a preparation method thereof, and particularly, under the protection of nitrogen flow, 3, 3 '-diaminobenzidine and diphosphonic acid substituted aromatic dicarboxylic acid react for 6-30 hours at 180-250 DEG C by taking polyphosphoric acid as a medium, and the phosphonated polybenzimidazole polymer is obtained through polycondensation. The phosphonated polybenzimidazole polymer disclosed by the invention has good solubility in water under an alkaline condition, can be used as a solvent in subsequent processing, has the characteristics of no pollution and environmental protection, is easy to recover and has a wide application prospect.

The invention discloses a high-temperature-resistant adhesive for a motor iron core punching sheet and a preparation method of the high-temperature-resistant adhesive, and the high-temperature-resistant adhesive comprises the following components in parts by mass: 60-80 parts of solid polyfunctional novolac epoxy resin; 5 to 15 parts of polyurethane modified epoxy resin; 5 to 15 parts of solid bisphenol A epoxy resin; 5-20 parts of a heat-resistant thermoplastic resin; 1 to 4 parts of a silane coupling agent; 2-8 parts of a filler; 4-10 parts of a curing agent; 0.05 to 0.2 part of an accelerant; the solvent is used for dissolving and mixing the components; according to the high-temperature-resistant adhesive for the motor iron core punching sheet, an organic-inorganic toughening mode is combined, three kinds of organic resin including polyurethane modified epoxy resin, solid bisphenol A type epoxy resin and heat-resistant thermoplastic resin are adopted, and an inorganic filler is used in a matched mode, so that the solid polyfunctional epoxy resin is subjected to toughening modification. According to the technical scheme, the problem that high toughness and high temperature resistance are difficult to consider under the condition that an existing motor iron core punching sheet adopts a modified epoxy adhesive to improve the toughness and peel strength of the adhesive is solved.

The invention relates to the technical field of organic silicon elastomers, in particular to a multi-synergistic self-repairing polysiloxane elastomer and a preparation method thereof, and the preparation method is based on a dynamic borate bond and imine bond synergistic preparation process and a hydrogen bond and dynamic borate bond / imine bond synergistic preparation process. Compared with a single dynamic imine bond or borate bond self-repairing system, the preparation method of the multi-synergetic self-repairing polysiloxane elastomer has the advantages that the mechanical property and the self-repairing efficiency of a material are improved by utilizing a strong and weak dynamic bond synergetic system, the process for preparing the organic silicon elastomer is simple, convenient and feasible, the reaction period is short, and the cost is low. The reaction can be completed under the room temperature condition, the self-healing condition is mild, a sample can be self-repaired only under the room temperature condition, industrial production and practical application are greatly facilitated, and the method is expected to be applied to sealing materials and flexible electronic devices. The used raw materials are commercially available, so that large-scale production in industrialization is facilitated.

The invention provides low-silver-content conductive paste for a low-temperature curing HJT battery and a preparation method of the low-silver-content conductive paste, and belongs to the technical field of polymer-based electronic paste materials and HJT efficient battery materials. The low-silver-content conductive paste is composed of the following components in percentage by weight: 52-80% of micron-sized silver-coated copper ball powder, 14-42% of submicron-sized spherical silver powder, 1-3% of an organic solvent, 0.5-2% of a curing agent, 2.5-4% of resin and 0-1% of an auxiliary agent. The micron-sized silver-coated copper ball powder is spherical, and the median particle size is 4-6 microns; the submicron spherical silver powder is in a spherical shape or a sheet shape or a combination of the spherical shape and the sheet shape. The median particle size of the submicron spherical silver powder ranges from 100 nm to 900 nm. The prepared HJT conductive paste can be cured at the low temperature of 150-200 DEG C and has good conductivity, printing performance and adhesive force, the silver content in the paste is only 30-50%, the production cost of a solar cell is greatly reduced, and popularization of the heterojunction solar cell is effectively promoted.

The invention belongs to the technical field of intelligent controlled-release antibacterial packaging, and particularly relates to a preparation method and application of a multi-response polymer fresh water absorption pad of a sandwich-like structure. The preparation method comprises the following steps: firstly, preparing a hydrophilic inner-layer spinning solution, a humidity response middle-layer spinning solution and a pH response outer-layer spinning solution; the hydrophilic inner layer spinning solution, the humidity response middle layer spinning solution and the pH response outer layer spinning solution are subjected to continuous electrostatic spinning to prepare a composite membrane of a three-layer nanofiber structure, namely the multi-response polymer fresh water absorption pad of a sandwich-like structure. Through the layered design, the water absorption pad integrates the functions of one-way moisture transmission, antibiosis and corrosion prevention, the preservation period of food is prolonged, self-adaptive adjustment can be achieved according to the humidity and pH change in the storage environment, the dynamic requirements of different food storage conditions are met, and the more accurate preservation effect is provided. And meanwhile, various food packaging requirements can be met, food loss is effectively reduced, economic benefits are improved, and the application prospect is wide.

The invention relates to a ceramic product and a preparation method thereof, in particular to a preparation method of a carbon-ceramic brake disc with a composite friction layer and the carbon-ceramic brake disc, which are used for overcoming the defects that the production cost is increased and the large-scale application of the carbon-ceramic brake disc is restricted due to low material utilization rate in the manufacturing process of the carbon-ceramic brake disc. The preparation method of the carbon-ceramic brake disc with the composite friction layer sequentially comprises the following steps of preparation of the carbon-carbon composite material, rough machining, preparation of the heat conduction functional layer, preparation of the composite friction layer, ceramic treatment and finish machining. The heat conduction function layer can effectively reduce the temperature of the disc face in the braking process, the service life of calipers and other surrounding accessories is prolonged, the components of the composite friction layer are uniform and can be designed, and noise and shaking can be reduced in the braking process; in addition, the utilization rate of raw materials is improved and the production cost is reduced by using the residual stub bar. Meanwhile, the invention further discloses a carbon ceramic brake disc with the composite friction layer.

The invention discloses a preparation method of a sodium alginate fiber biological material fiber with a hollow structure and a sodium alginate fiber.The preparation method comprises the following steps that 101, CaCl2 particles are dissolved in deionized water and fully stirred, and a CaCl2 / H2O core layer spinning solution is prepared; step 102, dissolving sodium alginate in deionized water, heating to improve the solubility of the sodium alginate in the deionized water, and fully stirring to obtain an SA / H2O cortex spinning solution; and step 103, respectively extruding the SA / H2O skin layer spinning solution and the CaCl2 / H2O core layer spinning solution into a CaCl2-removed coagulating bath through a coaxial needle at the speeds of 200 [mu] L.min <-1 > and 200 [mu] L.min <-1 >, and aging to obtain the hollow fiber. According to the preparation method, a coaxial spinning process is adopted, and the problems of fluid fracture and the like caused by drafting instability can be effectively avoided. Hollow fibers are used for replacing solid rod-shaped fibers, the process is efficient, convenient, energy-saving and environment-friendly, the experiment repeatability is high, a high-voltage electric field and toxic substances are not involved in the preparation process, and damage to biological tissues is avoided.

The present invention relates to a skid-mounted natural gas processing device. The natural gas processing device is skid-mounted as a whole and shipped out of the factory. The on-site assembly is simple and quick, and the device is convenient for transportation. With its convenient and quick construction method and safe and reliable operation mode, it adopts two-stage compression and two-stage separation. It can efficiently recover the associated gas resources of the oil field according to different oil field scales and gathering and transportation conditions, and is convenient for subsequent harmless treatment and deep processing of downstream products, so that the resources can be fully utilized, which is beneficial to oil field production and safety management.

The invention relates to the field of design, processing and manufacturing of compressor impellers, in particular to a novel discrete wheel cover closed impeller which comprises a lower wheel cover, a middle wheel cover and an upper wheel cover, the lower wheel cover is connected with the middle wheel cover through welding, and the middle wheel cover is connected with the upper wheel cover through welding, so that the blade top leakage rate of the discrete wheel cover closed impeller is smaller, and the performance of the discrete wheel cover closed impeller is superior to that of a semi-open impeller; the impeller has better manufacturability, is more beneficial to processing and manufacturing, has larger welding contact area and higher welding strength, meanwhile, the distance between the lower impeller cover and the middle impeller cover and the distance between the middle impeller cover and the upper impeller cover are smaller than 3mm, and the leakage rate is not greatly changed, so that the performance of the impeller is basically consistent with that of a closed impeller, and the axial force level is also basically consistent with that of the closed impeller; and the performance of the discrete wheel cover closed impeller is improved.

The invention belongs to the technical field of aviation composite material component manufacturing, and relates to a honeycomb sandwich composite material wedge-shaped trailing edge part manufacturing method. Comprising the following steps: 1) manufacturing a skin and a rear beam; 2) preforming the honeycomb core; 3) gluing the honeycomb core and the skin; (4) the rear beam and the rear beam male die are fixed to a rear beam forming platform; (5) a limiting block is installed on the rear beam forming platform; (6) an adhesive film is pasted on the surface of the rear beam, and polystyrene foam is coated; (7) the skin honeycomb core assembly and the rear beam are glued and positioned to form a wedge-shaped trailing edge; 8) packaging the vacuum bag and installing a fixed clamping plate; (9) removing the vacuum bag for detection after vacuumizing and pre-compacting, and reassembling the skin honeycomb core assembly if the detection is not qualified; and (10) the step (8) is repeated for vacuum compaction and curing.

The invention provides a flame-retardant cellulose aerogel reinforced resin material as well as a preparation method and application thereof. The limit oxygen index of the resin material in air is 20%-50%. The preparation method comprises the following steps: mixing nanocellulose with deionized water, acidizing, and adding a silicon compound to obtain a cellulose-silicon suspension; and suspending a resin material sample strip in a mold, pouring the cellulose-silicon suspension into a gap between the resin material sample strip and the mold, freezing, demolding, drying and baking to obtain the cellulose-silicon composite material. The obtained resin material can be well applied to the fields of reinforced modified plastics, buildings, electric heating and heat insulation materials, and the flame retardant property of the composite material can be remarkably improved under the condition that the strength of the resin material is maintained.

The invention discloses a magnetic recoverable nanoparticle anchored high-entropy catalyst as well as a preparation method and application thereof, and belongs to the technical field of organic wastewater treatment. The preparation method provided by the invention adopts coprecipitation and calcination processes, and has the advantages of wide raw material source, low cost and convenient process. In the high-entropy catalyst anchored by the magnetic recoverable nanoparticles prepared based on the method, Cu is separated out from a solid solution and anchored on the surface of the high-entropy catalyst in situ to form a unique catalytic structure, and the high-entropy catalyst has high catalytic activity, selectivity and stability and is long in service life, high in treatment efficiency and wide in application range. The high-entropy catalyst anchored by the magnetic recoverable nanoparticles is applied to the field of catalytic oxidation of organic wastewater, the problems that high-concentration organic wastewater is difficult to degrade, the durability of the catalyst is poor and the like can be solved, and the high-entropy catalyst has a good application prospect.

The invention relates to an integrated vehicle thermal management system and a control method thereof. The integrated vehicle thermal management system comprises a structural box body, a processing device is arranged on the structural box body; the processing device is electrically connected with the sensor unit and the execution unit; the execution unit comprises a circulating waterway unit and a circulating refrigerant unit; a water-fluorine heat exchanger is arranged between the circulating waterway unit and the circulating refrigerant unit for heat exchange; the device is reasonable in design, compact in structure and convenient to use.

The invention relates to an on-orbit floating plugging butt-joint locking mechanism. The device is composed of a locking driving assembly, a valve body flexible tolerance module, an electric connector tolerance assembly, a floating assembly and a driven end assembly. The locking driving assembly is used for realizing capturing and locking actions; the valve body flexible tolerance module and the electric connector tolerance assembly are mainly used for self-adaptive flexible plugging in the butt joint process. The floating assembly completes the plugging action of the electric connector and the valve body; the passive end assembly is composed of a valve body, an electric connector, an installation bottom plate and the like, is installed on a target spacecraft and is matched with the active end to complete work tasks. According to the invention, transmission of different fuel fluids in a plurality of sealed channels can be realized at the same time.

The invention relates to a method for preparing idesia oil from idesia peel, which comprises the following steps: (1) primary squeezing: performing primary squeezing on dried idesia peel, and separating to obtain primary squeezed idesia crude oil and primary squeezed cake meal; (2) infiltrating the cake meal; infiltrating the virgin cake meal by using an extraction solvent; (3) squeezing auxiliary extraction: carrying out secondary squeezing on the infiltrated cake meal obtained in the step (2) to obtain an extraction liquid; and (4) separating the leaching solution, namely separating the leaching solvent and the idesia polycarpa leaching crude oil from the leaching solution in the step (3). The idesia oil is extracted by using the idesia peel as the raw material, the idesia peel resource waste and the environmental pollution are reduced, and the oil extraction is fast and the solvent consumption is low by adopting the squeezing-assisted extraction mode.

The invention relates to the technical field of tiles, in particular to an antiskid tile and a preparation method thereof. The anti-slip ceramic tile comprises a green body layer, an anti-slip layer and an anti-slip layer which are sequentially stacked, the green body layer is composed of lime, limestone powder, ceramic tile cement and the like; the anti-skid layer is composed of quartz stone powder, potassium feldspar, aluminum oxide and the like; the preparation method comprises the following steps: preparing the green body layer, preparing glaze slip of the anti-slip layer and the anti-slip layer, glazing and firing. By designing the three-layer structure and optimizing the raw material ratio and the preparation process, the ceramic tile plaster, the river sand or yellow sand, the lithium chinastone and other raw materials are used for forming a basic framework and performance of a ceramic tile green body, and the suspending aid, the bentonite and the sodium silicate are used for improving the dispersity, the cohesiveness and the fluidity of the raw materials; the material of the anti-skid layer has good wear resistance, hardness and anti-skid performance; the anti-slip layer material can form a stable compound in the glaze layer, and the anti-slip performance and attractiveness of the ceramic tile can be enhanced.

The invention provides a heat-conducting vegetable protein-based composition, a heat-conducting vegetable protein adhesive as well as a preparation method and application of the heat-conducting vegetable protein-based composition and the heat-conducting vegetable protein adhesive. The heat-conducting vegetable protein-based composition provided by the invention is prepared by ball-milling raw materials including a heat-conducting filler, modified vegetable protein and (3-(methacrylamido) propyl) trimethyl ammonium chloride in a mass ratio of 1: (0.3-5): (0.03-1) for 15-25 hours. The heat-conducting vegetable protein adhesive comprises the following raw materials in percentage by weight: 6-20% of the heat-conducting vegetable protein-based composition and 3-8% of a cross-linking agent, and further comprises 0.1-3% of a flame-retardant reinforcing agent on the basis of the heat-conducting vegetable protein-based composition and the cross-linking agent. The heat-conducting vegetable protein adhesive provided by the invention adopts the heat-conducting vegetable protein-based composition, has good cementing performance and water resistance, also has good heat conductivity, flame retardance and mildew resistance, is beneficial to preparation of multifunctional materials, and is beneficial to industrial application, especially in the field of artificial board industry.

The invention discloses a green MOF-resin nano composite adsorbent as well as a preparation method and application thereof. A preparation method of a green MOF-resin nano composite adsorbent comprises the following steps: (1) soaking resin in absolute ethyl alcohol for pretreatment to obtain pretreated resin; (2) dissolving an aluminum salt in water to form an aluminum salt solution, and soaking the pretreated resin in the aluminum salt solution to serve as a first reactant; (3) dissolving 2, 5-furandicarboxylic acid in an acetic acid-water mixed solution to serve as a second reactant; and (4) uniformly mixing the first reactant and the second reactant, heating and refluxing the mixture, and washing, drying and sieving the obtained product to obtain the MOF-resin nano composite adsorbent. According to the invention, macroporous resin and a microporous MOF material are combined to form a nano composite adsorbent with a hierarchical pore structure; the nano composite adsorbent has a good adsorption effect on CO2, and is simple and convenient to regenerate, good in cycle performance and wide in application prospect.

The utility model provides a blade battery which comprises a battery shell and a pole roll, the pole roll is arranged in the battery shell, and the battery shell is provided with a first side and a second side which are oppositely arranged; the at least two pole column pairs are connected with the pole roll, and each pole column pair in the at least two pole column pairs comprises a positive pole column and a negative pole column which are arranged at an interval; wherein one of the at least two pole pairs is arranged on the first side, and the other one of the at least two pole pairs is arranged on the second side. By adopting the technical scheme provided by the utility model, the technical problem that the internal resistance of a blade battery in the prior art is relatively large can be solved.

A marine methanol fuel storage and supply and volatile gas recovery system comprises a fuel supply unit, a connector which is connected with a methanol fuel engine and conveys methanol fuel to the methanol fuel engine, a storage unit which is connected with the fuel supply unit and supplements and conveys the methanol fuel to the fuel supply unit, and a volatile gas recovery unit which is connected with the storage unit and conveys the methanol fuel to the fuel supply unit. The volatile gas recovery unit is used for introducing volatile gas from the storage unit and sending recovered methanol back to the storage unit after treatment, and the utility unit is respectively connected with the fuel supply unit, the storage unit and the volatile gas recovery unit and provides auxiliary media including a refrigerant, steam, seawater, fresh water and nitrogen; the system adopts the following process measures: conveying of daily methanol, supply of methanol fuel of an engine, collection of accident methanol, recovery of volatile gas, cooling of a coil pipe and supply of public engineering. A volatile gas recovery technology is adopted, stable storage and reliable supply of methanol fuel are achieved, meanwhile, high recovery rate and up-to-standard emission of volatile gas are achieved, and the method has the advantages of being complete in process and safe in operation.

The invention belongs to the technical field of welding, and particularly relates to a consumable electrode CO2 gas shield flux-cored wire suitable for cryogenic high manganese steel welding, and a flux core accounts for 25-30% of the total weight of the flux-cored wire; the flux core comprises, by weight, 25%-35% of rutile, 30%-34% of electrolytic manganese metal, 1%-5% of potassium sodium titanate, 2%-5% of quartz, 1%-3% of zircon sand, 0-0.5% of manganese ore, 1%-3% of rare earth ferrosilicon alloy, 0.5%-1.5% of rare earth fluoride, 3%-8% of high-carbon ferrochrome, 2%-4% of molybdenum powder, 2%-4% of magnesium-calcium alloy, 3%-7% of aluminum-zirconium alloy, 9%-12% of nickel-magnesium alloy, 0.5%-1.5% of rare earth silicon-calcium alloy and the balance flux. 1-1.5% of bismuth oxide, 0.5-1.5% of graphite and the balance of iron powder. The invention provides the consumable electrode CO2 gas shield flux-cored wire which is good in process and mechanical property, simple in production process and suitable for cryogenic high manganese steel welding.

The utility model belongs to the technical field of aviation connection structures, and discloses an antenna connection structure on a fairing, which comprises an airtight box, the bottom of the airtight box is mounted on a fuselage skin, a through hole matched with the airtight box in structure is arranged at the position of the fairing skin corresponding to the airtight box, and the upper end of the airtight box extends out of the fairing skin through the through hole. The top of the airtight box is provided with an interface for installing an antenna. The airtight box extends out of the fairing, the bottom of the airtight box is connected with the fuselage reinforcer, and force transmission is direct; the end part of the airtight box is not directly connected with the fairing skin, but is rotationally connected through the L-shaped check ring and the rubber part, so that the requirement on the positioning precision of the fairing is low, and the manufacturability is good; the rubber pad is additionally arranged at the opening gap of the airtight box of the fairing, so that rainwater is prevented from flowing from the gap between the airtight box and the fairing skin, and the waterproof effect at the joint is not reduced.

The invention belongs to the field of welding materials, and particularly relates to an ultra-low-carbon high-Si austenitic stainless steel welding wire resistant to high-temperature concentrated nitric acid corrosion and application thereof. The welding wire comprises the following chemical components in percentage by weight: less than or equal to 0.03% of C, 0.3-1.6% of Mn, 3.5-4.5% of Si, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 18.5-20.5% of Cr, 14.5-16.0% of Ni, less than or equal to 1.1% of Mo, less than or equal to 0.15% of Nb, 0.03-0.12% of N, less than or equal to 0.1% of Cu, less than or equal to 0.06% of Co, less than or equal to 0.05% of Al, less than or equal to 0.05% of V and the balance of iron. The welding wire is suitable for welding austenitic stainless steel parts used in high-temperature concentrated nitric acid environments such as nuclear power or petrochemical engineering, the welding process is stable, splashing is small, and the processing property is good. After the ultralow-carbon high-Si austenitic stainless steel welding wire for the high-temperature concentrated nitric acid environment is used for welding, a welding seam with excellent mechanical property can be obtained, the crack sensitivity is low, and the requirement of the high-temperature concentrated nitric acid corrosion service environment is met.

The invention relates to an additive manufacturing method of a continuous fiber reinforced composite material, belongs to the technical field of additive manufacturing, and solves the problems that an existing additive manufacturing technology is not suitable for continuous fiber reinforced metal matrix and ceramic matrix composite materials, and the process quality of additive manufacturing of a continuous fiber reinforced resin matrix composite material is poor. An additive manufacturing method of a continuous fiber reinforced composite material comprises the steps that S1, a three-dimensional model of a laminated composite material product is established, slicing treatment is carried out, and each layer of two-dimensional fiber fabric is contained in a corresponding slice; s2, prefabricating a two-dimensional fiber fabric in a layered manner; and S3, additive manufacturing of the laminated composite material product is conducted through a 3D printing forming method. According to the method, rapid additive manufacturing of continuous fiber reinforced ceramic-based, metal-based and resin-based composite materials is achieved, fiber and matrix infiltration in the obtained product is good, the interface bonding strength is high, and compared with a continuous fiber reinforced composite material obtained through an existing method, the continuous fiber reinforced composite material has better process quality and performance.

The invention discloses a preparation method of a PET foam material based on maleic anhydride grafted polypropylene modified PET, maleic anhydride (MAH) is grafted to a polypropylene chain through a chemical grafting method to form maleic anhydride grafted polypropylene (PP-g-MAH), the maleic anhydride (MAH) is a bifunctional compound with high reaction activity, and when the maleic anhydride (MAH) is grafted to the PP chain, the PP-g-MAH is grafted to the PP chain, the PP-g-MAH is grafted to the PP chain to form the PP-g-MAH. Polar groups can be provided, and the interfacial compatibility with PET is enhanced; an anhydride group of the PP-g-MAH can react with a terminal hydroxyl group in PET (Polyethylene Terephthalate), so that the PET is modified; experiments prove that the crystallization induction time of the modified PET can be effectively shortened and the crystallization rate and crystallinity can be improved in the production process of manufacturing the foam material from PET, so that the performance of the modified PET foam material is remarkably improved.