29results about How to "Reduce flaking" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention relates to the technical field of asphalt concrete, and discloses an anti-crack asphalt concrete material and a preparation method thereof. According to the asphalt concrete material disclosed by the invention, by adding the reinforcing filler and the composite aerogel, the crack resistance, the service life and the ultraviolet aging resistance of a matrix are remarkably improved; wherein the reinforcing filler is based on the synergistic effect among modified lignin, diatomite and hydrotalcite, the compatibility among modified lignin, diatomite and hydrotalcite is improved by utilizing a silane coupling agent, and the dispersity of the reinforcing filler in a matrix is improved, so that the crack resistance of the matrix is improved, the service life of the matrix is prolonged, and the ultraviolet resistance of the matrix is improved; the composite aerogel has excellent heat insulation performance and a three-dimensional network structure, and the crack resistance of the matrix can be improved through the synergistic effect.

The invention discloses a preparation method of a high-temperature wear-resistant multilayer material on the surface of a precision part, and relates to a preparation method of a high-temperature wear-resistant coating on the surface of the precision part. The invention aims to solve the technical problem of poor wear resistance of the surface coating of the precision part at high temperature at present. According to the invention, a magnetron sputtering multi-target co-sputtering mode is adopted, a laminated composite film is formed on the surface of a precision part such as a shaft, and selected target materials are a CoCrFeNi target, a Ti target and a CuNb target. In the preparation process of the multi-layer film, due to the fact that a large number of interfaces exist and can effectively hinder dislocation movement, and a large number of self-lubricating matter phases are matched together, the hardness and abrasion resistance of the material are improved, and the service life of the multi-layer film is prolonged. And the multilayer film structure can optimize the high-temperature phase transformation resistance of the whole coating by adjusting the thickness ratio and high-temperature elements between the layers, so that the high-temperature performance of the coating is remarkably improved, and the high-temperature wear resistance of the CoCrFeNi / Ti / CuNb multilayer material is more excellent.

The present invention relates to the technical field of composite membranes, and discloses a PO composite membrane and a preparation method thereof. The PO composite membrane prepared by the present invention comprises a base membrane and a coating liquid; wherein the base membrane is formed by coextrusion of an inner layer, a secondary outer layer and an outer layer, and the coating liquid is a mixture of the following raw materials in parts by weight: 25-35 parts of aluminum sol, 5-8 parts of modified hyperbranched polymer, 2-4 parts of polyvinyl pyrrolidone, 1-3 parts of sodium lauryl sulfate, 5-7 parts of polyacrylate resin, 4-6 parts of modified chitosan, and 45-55 parts of deionized water; after the base membrane is coated with the coating liquid, a composite membrane is obtained, which has excellent adhesion, hydrophilicity and drip anti-fogging performance.

The invention discloses a preparation method of a solid electrolyte composite coating modified positive electrode material. The preparation method specifically comprises the following steps: S1, preparing a positive electrode material composite coating layer; s2, optimizing the characteristics of the composite coating layer; s3, assembling the solid-state battery; the invention relates to the technical field of solid-state batteries. According to the preparation method of the solid-state electrolyte composite coating modified positive electrode material and the solid-state battery, the interface resistance between the positive electrode and the solid-state electrolyte is effectively reduced through the oxide-polymer composite coating layer, the rapid transmission of lithium ions is promoted, and the charge-discharge efficiency and the energy density of the battery are improved; the flexibility of the polymer and the high mechanical strength of the oxide are combined, the structural stability of the battery in the charging and discharging process is improved, the pulverization and peeling phenomena of the positive electrode material are reduced, the cycle life of the solid-state battery is remarkably prolonged by optimizing the composition and structure of the coating layer, the capacity fading is reduced, and the service life of the solid-state battery is prolonged. And the cycling stability and reliability of the battery are improved.

The invention discloses a high-entropy alloy composite coating material and a preparation method thereof. The method comprises the following steps: weighing powder according to the proportion of the high-entropy alloy composite coating material, and carrying out high-energy ball milling under the protection of inert gas to obtain mixed powder; preparing a high-entropy alloy coating by adopting a laser cladding process for the obtained mixed powder; and the prepared high-entropy alloy coating is subjected to heat treatment, the heat treatment temperature ranges from 800 DEG C to 1300 DEG C, the heat treatment time ranges from 1.0 h to 1.2 h, water quenching is conducted to the room temperature after heat treatment is finished, and the high-entropy alloy composite coating material is obtained. The eutectic high-entropy alloy coating is prepared through a laser cladding process method, the microstructure of the coating is changed through heat treatment and addition of ceramic particles, the hardness, wear resistance and corrosion resistance of the coating can be improved while the FCC + BCC double-phase eutectic microstructure in the coating is kept, and the coating has the advantages of being high in mechanical strength, good in corrosion resistance and the like. And the process can be adjusted according to application requirements to obtain high-entropy alloy coatings with different properties, and industrial application is facilitated.

The application relates to the technical field of wafer processing equipment, in particular to a reaction cavity for a high-hydrogen process and a plasma processing equipment, which comprises a quartz tube, a first coil is arranged outside the quartz tube and is connected with an external radio frequency power source, a Faraday shield cage is arranged outside the quartz tube and between the quartz tube and the first coil, a plurality of slits are formed in the Faraday shield cage and extend along the axial direction, a blocking piece is arranged in the quartz tube, and the structure formed by the orthographic projection of the blocking piece on the circumferential side wall of the Faraday shield cage covers the structure formed by the orthographic projection of the first coil on the circumferential side wall of the Faraday shield cage. The blocking piece arranged in the quartz tube can effectively block the concentrated bombardment of the plasma generated in the high-hydrogen process on the inner wall of the quartz tube, significantly reduces the erosion of the quartz tube and the peeling of the particles, and improves the process yield of the plasma processing equipment and the service life of the equipment.

This application relates to the field of coating technology, specifically disclosing a heat-insulating, flame-retardant, and anti-corrosion coating and its preparation method. A heat-insulating, flame-retardant, and anti-corrosion coating comprises the following raw materials in parts by weight: 50-80 parts of silicone-acrylic emulsion, 10-15 parts of epoxy resin, 30-40 parts of heat-insulating microcapsules, 15-21 parts of hollow glass microspheres, 3-5 parts of dispersant, 0.5-2 parts of polypropylene glycol diglycidyl ether, 1-5 parts of leveling agent, and 15-20 parts of water. The heat-insulating microcapsules comprise an aluminum powder core and a heat-insulating and flame-retardant capsule wall layer, the capsule wall layer material comprising acrylic resin and polyamide resin. The preparation method is as follows: hollow glass microspheres and heat-insulating microcapsules are added to silicone-acrylic emulsion and water and dispersed evenly to obtain a mixture; the dispersant, polypropylene glycol diglycidyl ether, epoxy resin, and leveling agent are added to the above mixture and mixed evenly to obtain the interior wall insulation coating. The composition of this application achieves a comprehensive improvement in heat insulation, flame retardancy, and anti-corrosion performance.

This application provides a quenched and tempered steel plate and its production method. The quenched and tempered steel plate comprises the following components by mass percentage: C: 0.15–0.20%; Si: 0.20–0.40%; Mn: 1.20–1.50%; Cr: 0.20–0.50%; Ni: 0.10–0.20%; Nb: 0.020–0.040%; Ti: 0.010–0.040%; Mo: 0.30–0.50%; B: 0.0010–0.0025%; P≤0.015%, S≤0.004%; N≤0.004%, Als: 0.010–0.060%, with the remainder being Fe and unavoidable impurities. This application manufactures a thick, high-strength quenched and tempered steel plate with high surface quality by adjusting the elemental composition and content of the quenched and tempered steel plate, specifically by adding certain amounts of Ni, Cr, and B.

The application discloses an inorganic copolymer anticorrosive paint and a preparation method thereof, and relates to the technical field of paints. The inorganic copolymer anticorrosive paint comprises the following raw materials in parts by weight: 20-30 parts of silica sol, 8-15 parts of sodium hydroxide, 30-45 parts of metakaolin, 8-20 parts of quartz sand, 15-25 parts of water, 0.3-2 parts of sodium polyacrylate, 0.2-3 parts of polydimethylsiloxane emulsion, 5-12 parts of modified nanometer titanium dioxide, 6-10 parts of modified epoxy resin, 10-25 parts of hydroxyethyl methacrylate, 5-10 parts of zinc phosphate, 3-8 parts of aluminum tripolyphosphate and 2-6 parts of red iron oxide. The inorganic copolymer anticorrosive paint has scientific raw material proportioning, and the anticorrosive performance is enhanced through the modified nanometer titanium dioxide and the epoxy resin. In the preparation, step-by-step feeding and ultrasonic dispersion are adopted to ensure that the materials are uniform, and vacuum degassing and nitrogen protection are adopted to improve the stability. The silica sol, the zinc phosphate and other components have a synergistic effect, a dense coating is formed, the anticorrosive performance is high, the construction performance is good, and the inorganic copolymer anticorrosive paint is suitable for various scenes.

The invention provides automatic well logging equipment for a well site, and relates to the field of well drilling and logging. The automatic well logging equipment for the well site comprises a first mounting shell and a base, and a drilling assembly is arranged at the bottom of the first mounting shell; the drilling assembly comprises a movable shell slidably connected to the interior of the first mounting shell, a motor fixedly connected to the bottom of the movable shell, a rotating shaft rotationally connected to the bottom side of the movable shell, a drill bit fixedly connected to the bottom end of the rotating shaft and a first electric push rod fixedly connected to the top wall of the first mounting shell, and the top end of the rotating shaft is fixedly connected with an output shaft of the motor; the bottom end of the first electric push rod is fixedly connected with the motor; a positioning assembly is arranged at the top of the first mounting shell and used for fixing the first mounting shell to the well wall. A control assembly is arranged on the top of the base. A connecting cable is connected to the top of the first mounting shell. By means of the automatic logging equipment, the stability of the well wall can be kept in the drilling process, interference of an upper rock stratum on drilling operation is reduced, and collected rock debris is more reliable.

The invention belongs to the field of graphite tiles, and particularly relates to a production process of a graphite tile for electrolyzing rare earth, which comprises the following steps: weighing graphitized thermal insulation materials with different finenesses, including 10-16 parts by mass of large materials, 23-30 parts by mass of medium materials, 32-38 parts by mass of small materials and 20-26 parts by mass of powder materials, and uniformly mixing the raw materials to obtain a primary mixture; weighing 22-31 parts of modified liquid asphalt and 69-78 parts of the primary mixture, and performing secondary uniform mixing on the modified liquid asphalt and the primary mixture to obtain a secondary mixture; the secondary mixture is poured into a female die to be heated and subjected to compression molding, and a crucible-shaped graphite semi-finished product is obtained; cutting the bottom of the crucible-shaped semi-finished product to obtain a graphite cylinder, and then slitting the graphite cylinder by using a cutting machine to obtain the 1 / 4 cylindrical graphite tile, so that the electrochemical performance and physical stability of the graphite tile are optimized, the oxidation of the graphite tile is reduced, the service life is prolonged, and the stability and efficiency of the electrolysis process are improved.

The embodiment of the present invention discloses a dry electrode binder and a preparation method thereof, and a dry electrode pole piece, wherein the binder comprises polyethylene glycol fumarate. The present invention significantly saves production costs, improves manufacturing efficiency, and makes large-scale production more feasible; the present invention makes the electrode structure more stable, prolongs the cycle life of the battery, and is particularly suitable for applications with high requirements for mechanical strength and durability; the present invention improves the overall performance and reliability of the electrode, improves the conductivity and rate performance of the electrode, and makes it suitable for high-power applications.

This invention belongs to the fields of powder metallurgy and materials science and technology, specifically disclosing a preparation process for a high-wear-resistant WC-based composite material. The process involves preparing WC powder, second-phase powder, and graphene material; adding the graphene material to a dispersion medium and performing ultrasonic dispersion; mixing the graphene dispersion with the WC powder and second-phase powder and ball milling; drying the mixture using a vacuum rotary evaporation drying process; and densifying it using a hot-pressing sintering process. This invention enables the WC-based composite material to simultaneously achieve high hardness and high fracture toughness; effectively inhibits oxidative wear of the WC-based composite material at high temperatures, improving its high-temperature wear resistance; and achieves uniform and stable dispersion of the graphene reinforcing phase in the WC matrix, avoiding agglomeration, thereby fully utilizing its strengthening and lubrication effects. The composite material prepared by this invention is particularly suitable for use as high-speed cutting tools, high-temperature molds, and high-temperature moving parts in aerospace applications, and has broad application prospects.

The utility model relates to the field of twist drill, and disclose a kind of multilayer composite coating twist drill, including drill bit end and the connecting end being connected with drill bit end, at least two groups of spiral grooves are set in the one end of drill bit end, spiral groove is used to discharge the debris generated when drilling, the inner side edge end position of spiral groove is integrally formed with reinforcing blade, the outside of drill bit end is provided with composite coating, reduce use cost, improve economy: twist drill adopts detachable design, drill bit end and connecting end are detachably connected by plug-in part, bolt assembly and other structures.When drill bit end wears or is damaged, only drill bit end needs to be replaced, and the connecting end can continue to be used, greatly reducing material waste and reducing overall use cost. Compared with the situation that the traditional integrally formed twist drill needs to be scrapped as a whole, the economy and resource utilization of the product are significantly improved.

The application discloses an impact-resistant and wear-resistant epoxy resin modified mortar and a preparation method thereof, and relates to the technical field of mortar.The application comprises the following raw materials in mass parts: deionized water 170-190 parts, modified boron nitride synergist 13.13-14.38 parts, water reducing agent 0.8-1.2 parts, tributyl phosphate 0.6-0.8 parts, composite modified porous polysiloxane microspheres 26.25-28.75 parts, water-based epoxy resin 21-23 parts, Portland cement 420-460 parts, sulphoaluminate cement 105-115 parts, concrete expansive agent 15.75-17.25 parts, river sand 1050-1150 parts, water-based epoxy curing agent 27.3-29.9 parts.The introduction of the modified boron nitride synergist and other raw materials in the application simultaneously improves the compressive strength, the bending strength, the impact strength, the wear resistance, the anti-cavitation ability, the aging resistance and the alkali corrosion resistance.

The invention discloses a directionally solidified Fe-B-Si alloy surface protective film and a preparation method thereof. The Fe-B-Si alloy prepared by a directional solidification process is placed in liquid zinc for interfacial reaction. After the reaction is completed, the Fe-B-Si alloy is cooled to obtain a three-layer mortise and tenon structure protective film. The formed surface film and a metal substrate form a mutually interlocking mortise and tenon structure, which is firm and has high stability and density, and can effectively prevent surface peeling caused by zinc liquid cavitation.

This invention discloses a method for in-situ generating a highly bonded Cr2O3 interface to improve the thermal shock resistance of coatings. The method involves a coating preparation technique, particularly in the process of preparing a coating on a Cr-containing metal substrate, where an electric field of specific intensity is applied during the high-temperature heat treatment stage. By utilizing the electric field to induce the outward diffusion of Cr ions and the inward migration of oxygen ions in the substrate, a dense Cr2O3 transition layer is in-situ induced at the interface between the coating and the metal substrate. This transition layer effectively alleviates the problem of thermal expansion coefficient mismatch between the ceramic coating and the metal substrate, releases interfacial thermal stress, and significantly enhances the bonding strength of the coating. This invention achieves control over the thickness of the transition layer by adjusting the current intensity. Experiments show that this method can significantly suppress the generation of microcracks during thermal shock cycling, thereby greatly improving the thermal shock resistance of the coating and effectively solving the problem of easy cracking and peeling of oxide coatings during high-temperature thermal cycling.

This invention provides a method for optimizing the formulation of waterborne polyurethane anticorrosive coatings, comprising: acquiring basic component data of waterborne polyurethane, constructing a structured dataset, using an optimization algorithm to simulate and analyze the component ratios in the structured dataset, generating a candidate formulation set, extracting performance parameters related to adhesion and chemical resistance from the candidate formulation set, filtering through preset thresholds to obtain a selected formulation set, conducting simulation tests on the selected formulation set to obtain performance data, adjusting component ratios to generate an optimized formulation version if the performance data does not meet preset standards, classifying the optimized formulation version using a risk assessment model, eliminating high-risk ratios to form a stable formulation set, using low-risk formulations to predict synergistic performance effects, and determining the final formulation scheme.

The invention discloses a fluoride-free self-cleaning weather-resistant hydrophobic coating, a coating, a preparation method and application. The fluorine-free self-cleaning weather-resistant hydrophobic coating comprises a first component, a second component and a third component, the first component comprises a carbon-silicon copolymer, an acid catalyst and a mixed solvent, the second component comprises silicate ester, an acid catalyst and a mixed solvent, and the third component comprises a curing agent, an auxiliary catalyst and a mechanical strength enhancer. The carbon-silicon copolymer comprises a long-carbon-chain hydrophobic chain segment and a siloxane anchoring chain segment, and the carbon-silicon copolymer at least can be cross-linked with each other. The coating is formed by curing a fluoride-free self-cleaning weather-resistant hydrophobic coating. The fluorine-free compound is adopted as the raw material, the hydrophobicity, the flexibility, the adhesive force, the mechanical property, the weather resistance, the chemical stability and the like are remarkably improved, meanwhile, good transparency can still be kept, and due to the characteristics, a new coating is more suitable for application scenes needing high durability, high abrasion resistance and long-time outdoor exposure.

This invention belongs to the field of monocrystalline silicon production technology, specifically relating to a quartz crucible coating structure and its preparation method for reducing the oxygen content of monocrystalline silicon. The quartz crucible coating structure for reducing the oxygen content of monocrystalline silicon includes a coating 1 and a coating 2. Coating 1 is disposed on the inner surface of the quartz crucible and is in a molten state at temperatures above 1200°C. Coating 2 is disposed on top of coating 1 and is in a solid state at temperatures above 1500°C. This invention, by designing a specific coating on the inner surface of the quartz crucible, reduces direct contact between the quartz crucible and the molten silicon, thereby effectively reducing the generation of SiO during monocrystalline silicon pulling, thus reducing the oxygen content in the monocrystalline silicon rod, improving the quality of the monocrystalline silicon, and reducing coating peeling caused by differences in internal stress and thermal expansion coefficients, improving the stability and service life of the coating.

The invention relates to the field of coating compositions, and particularly discloses an anti-icing self-cleaning coating material for a tower drum of a wind driven generator as well as a preparation method and application of the anti-icing self-cleaning coating material. The anti-icing self-cleaning coating material comprises a bottom coating material and a surface coating material, the bottom coating material contains fluorosilane, amino silane, ethyl acetate, butanone, filler, fluorocarbon resin and an isocyanate curing agent, the filler comprises alpha-Fe2O3 modified mesoporous SiO2 particles and hydroxylated boron nitride, and the surface coating material comprises fluorine modified SiO2 particles and acetone. The anti-icing self-cleaning coating material can achieve a good protection effect on the tower drum of the wind driven generator, the water contact angle of the surface of the coating is larger than 155 degrees, the water rolling angle is smaller than 5 degrees, the ice adhesion strength is smaller than 30 kPa, the water contact angle is still larger than 150 degrees after 20 times of freezing and thawing cycles, at the moment, the tower drum can better adapt to the low-temperature and high-humidity environment, the coating stripping possibility is low, and the anti-icing self-cleaning coating material can be applied to the wind driven generator tower drum. And the corrosion speed of the steel is reduced, so that the normal use time limit is longer.

Provided are a phase shift mask blank that suppresses the formation of haze on a phase shift film surface and reduces film peeling during cleaning or a level difference in a cross-section of a modified portion during modification etching to improve transfer performance, a phase shift mask, and a method for manufacturing a phase shift mask. A phase shift mask blank (10) according to an embodiment of the present invention is a phase shift mask blank used for producing a phase shift mask to which exposure light having a wavelength of 200 nm or less is applied, the phase shift mask blank (10) including a transparent substrate (11) and a phase shift film (12), in which the phase shift film (12) includes a phase difference and transmittance adjustment layer (13), a protective layer against gas permeation (15), and a compositionally graded layer (14), and in the compositionally graded layer (14), a content of a component configuring the phase difference and transmittance adjustment layer (13) decreases from the substrate side (11) toward the protective layer against gas permeation (15) side, and a content of a component configuring the protective layer against gas permeation (15) increases from the substrate (11) side toward the protective layer against gas permeation (15) side.

The utility model relates to petroleum exploitation equipment technical field, concretely relates to a kind of pipeline auxiliary installation equipment for petroleum exploitation, it includes support frame platform, and the upper surface of support frame platform is provided with ring plate, and the plate surface of ring plate is radially slidably provided with arc push plate, and arc push plate is connected radial drive assembly;Two arc push plates are radially symmetrically arranged on the ring plate;Several round wheels are rotatably arranged on the inner arc side of arc push plate, and are evenly arranged along the arc shape of the arc, and the rotation direction of round wheel is towards vertical direction;Two layers of symmetric arc push plates are vertically arranged on the ring plate;Ring plate is connected with rotary drive assembly, and the rotation direction is along the radial direction of ring plate;Speed sensing assembly is provided on arc push plate.The utility model realizes the technical problem of adjusting alignment petroleum exploitation channel when petroleum pipeline is transported, and reducing the damage to pipeline in conveying process.

The invention discloses a waterproof anticorrosive coating and a preparation process thereof, and relates to the technical field of coatings, and the waterproof anticorrosive coating comprises the following raw materials in parts by mass: 90-100 parts of a component A and 5-8 parts of a component B, the component A is prepared from the following raw materials in parts by mass: 55 to 60 parts of water-based fluorocarbon resin, 10 to 20 parts of water-based hydroxy acrylic resin, 1 to 2 parts of a self-cleaning composite material, 0.5 to 2.5 parts of silica gel particles, 0.2 to 1 part of a dispersing agent, 0.1 to 0.5 part of a defoaming agent, 0.5 to 1 part of a thickening agent, 1 to 2 parts of a film-forming agent and 10 to 20 parts of water; the component B is a curing agent; the silica gel particles are added and matched with the self-cleaning composite material for use, so that the water absorption and release characteristics of the silica gel particles are combined with the photocatalytic performance of silicotungstic acid, and the self-cleaning capacity of the coating and the degradation efficiency of the coating on organic pollutants are remarkably improved.

The invention discloses a method for depositing a silicon oxide film, which comprises the following steps of: introducing oxygen and nitrogen in a boat rising process and a temperature rising process, introducing nitrogen and TEOS (tetraethyl orthosilicate) gas in a film deposition process, and regularly purging a process cavity in the film deposition process. Compared with a conventional deposition method, in the deposition method of the silicon oxide thin film, the silicon oxide thin film with good in-chip uniformity can be prepared by optimizing the deposition process steps, the deposition process parameters and the purging mode, and meanwhile the deposition method of the silicon oxide thin film has the advantages of being high in film forming stability, small in internal environment pollution and the like; the defect that the surface of an existing LPCVD silicon oxide film is prone to particle pollution is overcome, the use value is high, and the application prospect is good.

The utility model relates to a steel tube concrete composite column, in particular to an external channel steel-hollow interlayer steel tube composite column connected through bolts, which comprises an outer steel tube, an inner steel tube arranged in the center of the outer steel tube, a reinforcement cage arranged on the outer side of the outer steel tube, and the outer steel tube and the reinforcement cage are connected through channel steel. And outer side concrete is poured between the outer steel pipe and the reinforcement cage. The utility model has the advantages that the inner steel pipe, the outer steel pipe, the channel steel and the reinforcement cage of all the steel members are prefabricated in a factory, the modular assembly is realized through the high-strength bolts, and the field welding operation is avoided. The construction period is shortened by about 30%-50%, manual operation errors are remarkably reduced, the joint connection precision is guaranteed, and millimeter-level alignment of channel steel flange bolt holes and outer steel pipe openings and millimeter-level alignment of channel steel web connection openings can be achieved.

The invention relates to the technical field of blast furnace ironmaking, in particular to a backflow damping-down control method which comprises the following steps: before damping-down, notifying a dispatching room, a hot blast stove, a trough, a blowing station, an air blower station, a TRT control room, a gas plant management room, a soft water pump room and the like to make preparations; when slag iron is basically completely discharged, gradually reducing air and pressure, stopping oxygen enrichment, stopping coal, stopping operation of the TRT, and notifying a water conservancy project to adjust the cooling water amount of a bad tuyere; introducing steam and nitrogen into the furnace top; when high pressure is converted into normal pressure, the pressure difference is lower than the normal level, a cold air gate is closed, air temperature control is changed into manual operation, and a hot blast stove is stopped; and when the air pressure is reduced to about 0.04-0.05 MPa, gas cutting operation is carried out after a management room of a gas plant is contacted, and through standardized operation steps, particularly after a backflow valve is fully opened, hot gas upwards enters a backflow pipe system by virtue of a chimney effect, so that negative pressure in the furnace body is formed, the gas is effectively prevented from overflowing from an air port, and the personal safety of constructors is ensured.

The invention discloses a corrosion-resistant duplex stainless steel pipe for ocean engineering and a preparation method of the corrosion-resistant duplex stainless steel pipe, belongs to the technical field of duplex stainless steel, and aims to solve the problem that the corrosion resistance of duplex stainless steel in ocean engineering application needs to be further improved in the prior art. The preparation method of the corrosion-resistant duplex stainless steel pipe for ocean engineering comprises the following steps: reacting zinc oxide with 2-(4-chloro-phenyl)-2H-benzotriazole-5-ylamine, so as to obtain zinc oxide grafted 2-(4-chloro-phenyl)-2H-benzotriazole-5-ylamine; zinc oxide grafted 2-(4-chloro-phenyl)-2H-benzotriazole-5-ylamine and the epoxy modified carbon fiber are subjected to a reaction, and modified zinc oxide is obtained; and uniformly coating the treated duplex stainless steel surface with a coating obtained by uniformly mixing modified polyurethane, a defoaming agent, deionized water, a film-forming agent, a curing agent and an adhesion promoter, and heating and curing to obtain the corrosion-resistant duplex stainless steel pipe for ocean engineering. The corrosion-resistant duplex stainless steel pipe for ocean engineering has excellent corrosion resistance, chemical resistance and durability.