52results about How to "Inhibit scalability" patented technology

This utility model belongs to the field of bathroom technology, specifically relating to an explosion-proof overhead shower. The invention employs a double-ring gradient connection structure consisting of a main connecting ring and an auxiliary connecting ring. The main connecting ring comprises 2-8 spaced main connecting seats, providing high pre-tightening positioning. The auxiliary connecting ring, located outside the main connecting ring and composed of 12-30 spaced auxiliary connecting seats, is used to equalize circumferential stress. A positioning ring with an annular groove is provided on the inner side of the housing, cooperating with a positioning ring on the water outlet panel to achieve pre-positioning constraint during assembly. A pressure plate is sandwiched between the housing and the water outlet panel, with an integrally formed protrusion at the bottom of its pressure hole inserted into the positioning hole of the housing. The protrusion contains a water outlet hole with a diameter smaller than the pressure hole, forming an integrated throttling and pressure-stabilizing positioning unit. The main and auxiliary connecting parts are locked to their corresponding connecting holes by fasteners, achieving a rigid connection. This structure synergistically improves mechanical load-bearing capacity, assembly accuracy, and hydraulic buffering capacity, significantly enhancing explosion-proof reliability.

A method for manufacturing high-strength, hydrogen-embrittlement-resistant bolts based on microsphere shot peening, and the bolts themselves, are disclosed. The manufacturing method includes: S1, cold heading and thread rolling of alloy structural steel billets to obtain bolt forming parts; S2, surface cleaning of the bolt forming parts, followed by overall surface peening with microspheres driven by high-pressure air; after overall peening, targeted strengthening peening treatment is performed on stress concentration areas such as thread roots, undercut grooves, and flange transition corners to obtain reinforced bolt parts; S3, the reinforced bolt parts are cleaned, dried, and phosphated to obtain finished bolt parts. This design, through a "overall + targeted" composite microsphere shot peening strategy, introduces a uniform residual compressive stress field and a micron-level fine-grained plastic deformation layer on the bolt surface, forming a thicker strengthening layer in stress concentration areas, significantly improving the fatigue strength and delayed fracture resistance of high-strength bolts, while ensuring uniform surface roughness and stable assembly friction coefficient.

The invention provides composite cementing material building floor sound insulation mortar and a preparation method thereof, and belongs to the technical field of novel building materials. Aiming at strong-alkalinity, high-humidity and intermittent impact coupling special environments such as hospitals and the like, a geopolymer precursor composed of metakaolin and blast furnace slag micro powder and an alkaline activator are introduced and interwoven with a cement hydration product to form an alkali-corrosion-resistant composite gel matrix; meanwhile, the composite corrosion inhibitor with the pH response release characteristic is adopted, and corrosion inhibition components are released during strong alkaline invasion to form a composite protective film; and regenerated elastic particles subjected to surface silanization treatment are selected as a damping filler. Under the synergistic effect of the three components, the mutually aggravated failure cycle of chemical erosion and mechanical impact is interrupted, so that the long-term sound insulation stability, mechanical durability and corrosion resistance of the sound insulation mortar in a severe environment are remarkably improved.

The application discloses a TC4 titanium alloy impact type recoil brake and an additive manufacturing method thereof, and belongs to the fields of additive manufacturing and weapon equipment manufacturing. The method comprises the following steps: model construction and forming preparation, additive manufacturing integrated forming, post-processing, heat treatment strengthening, composite strengthening and finishing. The application adopts a scanning strategy of partition scanning combined with interlayer rotation to realize defect-free forming; the optimal matching of strength and impact toughness is realized through sequentially performed solid solution treatment and aging treatment; a continuous residual compressive stress layer is formed through sequentially performed ultrasonic rolling strengthening and laser impact strengthening. The impact energy of the TC4 titanium alloy impact type recoil brake treated by the method is greater than or equal to 25 J / cm2 at-40 DEG C, the tensile strength is greater than or equal to 1000 MPa, the yield strength is greater than or equal to 840 MPa, and the elongation after fracture is greater than or equal to 14%. Therefore, the application realizes the full-structure integrated near-net forming of the recoil brake, and significantly improves the service reliability and service life of the product.

The invention discloses a layered oxide positive electrode material of a sodium-ion battery and a preparation method of the layered oxide positive electrode material, and belongs to the technical field of batteries. The method comprises the following steps: preparing a NaNi < 0.33 > Mn < 0.33 > Fe < 0.33 > O2 precursor, mixing the precursor with a Na2S and P2S5 mixture under argon, carrying out heat treatment at 500 DEG C, and sintering with sodium hydroxide in an oxygen atmosphere at 800 DEG C to obtain the material. The core of the material is that a continuous super-ion conductor phase is formed on a grain boundary, a three-dimensional ion transmission network and a mechanical strengthening framework are constructed, the ion diffusion efficiency and the structural stability are remarkably improved, high-rate and long-cycle performance breakthrough is achieved, the process is controllable, and the industrialization potential is large.

The invention discloses a high-strength acrylic structural adhesive and a preparation method thereof, and belongs to the technical field of structural adhesives. The high-strength acrylic structural adhesive comprises a component A and a component B, the component A comprises an acrylate monomer, a first cross-linking agent, an antioxidant, a polyacrylate elastomer, a polymerization inhibitor, a reducing agent and modified mesoporous silica; the component B comprises an acrylate monomer, a first cross-linking agent, a polyacrylate elastomer, a polymerization inhibitor, an oxidizing agent and modified mesoporous silica; the acrylic ester monomers comprise ethyl methacrylate and lauryl methacrylate; 2, 4, 6-triallylphenol is adopted as the antioxidant; the polyacrylate elastomer is obtained by carrying out composite reaction on 2-acrylamido-2-methyl-1-propane sulfonic acid polymer particles, ethyl acrylate, vanillin methacrylate, an initiator and a second cross-linking agent; the second cross-linking agent is prepared from ethylene glycol dimethacrylate and triallyl phosphite ester.

The invention discloses a zirconia ceramic matrix with high thermal shock resistance as well as a preparation method and application thereof. The zirconia ceramic matrix comprises a matrix and a coating layer a; the matrix comprises the following components: 90-98 wt% of zirconium oxide; 1.5 to 8 wt.% of a stabilizing agent; % of a grain boundary regulating agent; the stabilizing agent is prepared from the following components in percentage by weight: 2.0 to 4.0 percent of Sc2O3, 0.5 to 1.5 percent of Yb2O3 and 0.3 to 1.0 percent of Er2O3; the grain boundary regulating agent is a composition of a boron source and an aluminum source; in the coating layer a, the molar ratio of zirconium to aluminum is (2-3): 1; and the component 1 is polyvinyl alcohol or polyvinylpyrrolidone. The fracture toughness, bending strength and thermal shock resistance of the ceramic matrix are effectively improved, and the overall mechanical property is remarkably improved. When the material bears thermal shock, the thermal shock resistance of the material is improved, and the application scene of the zirconia ceramic material is expanded.

The invention relates to the technical field of laser welding, and discloses a laser welding seam tracking and quality real-time detection system and method based on OCT image guidance. According to the method, through system calibration and offline learning, a coordinate mapping and feature database is established; during welding, the coaxial OCT is used for synchronously scanning a front groove and a rear molten pool area; tracking and correcting a welding path in real time based on the front three-dimensional point cloud; meanwhile, a dynamic feature sequence of the molten pool is extracted and analyzed; inputting the features into a pre-training machine learning model, and judging quality and predicting defects in real time; according to the judgment result, parameters such as laser power and welding speed are adjusted in a self-adaptive mode, and closed-loop control is formed; and full-process data is fed back to optimize the model. According to the invention, synchronous closed-loop control of groove tracking and internal quality detection is realized, and the welding precision and the quality reliability are improved.

This invention discloses a layered concrete structure with anti-penetration and filtering properties and its preparation method. It solves the problem in existing technologies where only the composition of the concrete layers is changed without improving the overall filtering performance. This invention has the beneficial effects of improving filtering performance and preventing further crack development. The specific solution is as follows: A layered concrete structure with anti-penetration and filtering properties includes a fiber-reinforced concrete layer and an intermediate composite material layer. The intermediate composite material layer is placed between two fiber-reinforced concrete layers. The fiber-reinforced concrete layer and the intermediate composite material layer are periodically arranged to form a layered concrete structure to enhance the filtering performance and improve the anti-penetration performance. The fiber-reinforced concrete layer contains steel fiber reinforcement to enhance the anti-penetration performance of the layered concrete structure. The wave transmittance in the intermediate composite material layer is different from that in the fiber-reinforced concrete layer, and the intermediate composite material layer is bonded to the fiber-reinforced concrete layer.

The application discloses a multi-gradient sharp corner punching die for amorphous alloy based on notch sensitivity and application thereof to punch amorphous alloy, soft magnetic material or metal thin strip. The multi-gradient sharp corner punching die for amorphous alloy based on notch sensitivity comprises a die body and a die front end; the die front end is provided with a circular punching end face; a plurality of sharp corners with top angles towards a punching direction are arranged on the edge region of the punching end face along the circumference thereof, the sharp corners are periodically arranged from high to low and then to high, and the higher the sharp corner is, the smaller the top angle is.

The utility model belongs to the technical field of fabricated building engineering, concretely relates to a kind of inner rib structure fire-resistant cage mould assembly monolithic vertical component, including the cage mould membrane shell prefabricated by fine stone concrete, the cage mould membrane shell is cavity structure, as permanent formwork and inner cavity post-cast concrete form integral force system;The inner side wall of the cage mould membrane shell is equipped with inner rib structure;The side edge splicing contact surface of the cage mould membrane shell is equipped with depth embossed concave-convex structure;The wall thickness middle part of the cage mould membrane shell is embedded with continuous steel mesh;Modified tensile fibre and hot melt fire-resistant fibre are uniformly doped in the prefabricated substrate of the cage mould membrane shell.The utility model realizes the integration of prefabricated cage mould and post-cast concrete, strengthens the connection integrity, eliminates concrete high-temperature burst hidden danger, improves the anti-cracking and anti-bending ability of component full life cycle, can be widely applied to the vertical load-bearing structure of various buildings, realizes the stress performance equivalent to cast-in-place of assembly monolithic structure.

The invention belongs to the technical field of oil paints, and discloses an anti-aging and anti-cracking water-based oil paint, which is prepared from the following components in parts by mass: 15 to 30 parts of pigment, 15 to 25 parts of modified linseed oil, 30 to 55 parts of acrylic resin emulsion, 0.5 to 1 part of PH regulator, 0.5 to 1.5 parts of thickening agent, 1 to 3 parts of nano filler, 0.2 to 0.6 part of anti-aging agent, 0.1 to 0.3 part of preservative and 10 to 20 parts of water. The modified linseed oil is formed by carrying out graft modification on linseed oil and an acrylate monomer; the acrylic resin emulsion is a specific monomer copolymer. Through the synergistic compatibility of the acrylate modified linseed oil and the acrylic resin emulsion, and in combination with the nano filler and the composite anti-aging agent system, the pigment film has good flexibility, uniform film-forming property and structural stability under a thick coating condition, meanwhile, the oxidation resistance and yellowing resistance are improved, and the generation of cracks is effectively inhibited. The oil paint has both aging resistance and cracking resistance.

The utility model relates to a kind of recycled aggregate durable pavement structure, it includes: stratiform main body, the stratiform main body sequentially includes from bottom to top: recycled aggregate particle compaction layer, mortar concrete pouring lower layer, mortar concrete pouring upper layer and inorganic cementing material reinforcing layer;The thickness of the recycled aggregate particle layer is 2~4cm, recycled aggregate particle is obtained by waste tyre;The thickness of the mortar concrete pouring lower layer is 8~12cm, the thickness of the mortar concrete pouring upper layer is 7~8cm;The thickness of the inorganic cementing material reinforcing layer is 5~10cm.

This invention discloses a method for controlling corner cracks in continuously cast slabs of low-manganese peritectic steel, belonging to the field of continuous casting production technology in iron and steel metallurgy. This method targets low-manganese peritectic steel with a carbon content of 0.12%-0.16% and a manganese content of 0.35%-0.9%. It solves the problem of corner cracks in continuously cast slabs of low-manganese peritectic steel by employing a combination of dual control of primary cooling water, control of the liquid level in the crystallizer, selection and use of protective slag, zoned control of the specific water volume in the secondary cooling water, dual acceptance of the crystallizer's perpendicularity, and synergistic adjustment of the straight guide section and the fan-shaped section. This invention eliminates the need for subsequent slab re-grinding, enabling hot slab delivery, reducing production costs, and improving production efficiency.

The invention discloses a method for regulating and controlling aluminum-steel bimetallic interface morphology based on a box dam type structure, and belongs to the field of metal material electric arc additive manufacturing. The additive manufacturing method comprises the following steps that S1, the box dam type middle layer structure is prepared on the steel surface; and S2, the surface of the steel is coated with a proper amount of brazing flux, additive manufacturing is conducted in the protective gas environment, and the aluminum-steel heterogeneous bimetallic structure is obtained. According to the method, the inhibition effect of the nickel-based alloy intermediate layer on generation of the fragile Fe-Al intermetallic compound is utilized, the structural design of the box dam type intermediate layer is combined, precise regulation and control over the microstructure of the intermetallic compound of the aluminum-steel heterogeneous bimetal structure interface are achieved, initiation and extension of cracks are effectively retarded, and through the micromechanical occlusion effect, the mechanical property of the intermetallic compound is improved. The problem of hard and brittle intermetallic compounds is solved, and the interface bonding strength of the aluminum-steel heterogeneous bimetallic joint is remarkably improved.

The application provides a medium-nickel ternary precursor, a preparation method and a positive electrode material. The preparation method of the medium-nickel ternary precursor comprises the following steps: (1) first seeds with a median particle size D50 of 0.5-1 mu m and second seeds with a median particle size D50 of 2-3 mu m are prepared by a coprecipitation method; (2) the first seeds are used, and a ternary metal salt solution, a precipitant solution and a complexing agent solution are fed in parallel to perform a first coprecipitation reaction to obtain an inner core; then the second seeds are used, and a second coprecipitation reaction is continuously performed to form a transition layer on the surface of the inner core; a third coprecipitation reaction is continuously performed to form an outer shell on the surface of the transition layer; and (3) the obtained product is filtered, washed and dried to obtain the medium-nickel ternary precursor. The positive electrode material prepared by the preparation method has the advantages that the lattice expansion and contraction stress under high voltage can be effectively buffered, microcracks and interface side reactions can be inhibited, and the positive electrode material has high compaction density and processing performance.

The invention relates to the technical field of metal welding, and discloses a high-strength tool alloy steel and ceramic composite layer welding process which comprises the following steps: quenching and tempering a substrate, processing a swallow-tail-shaped nano microstructure on a to-be-welded surface of the substrate through femtosecond laser, and then depositing a Ti layer with the thickness of 1 micron through magnetron sputtering, and carrying out heat preservation at 740-760 DEG C in a vacuum furnace for 1 hour for annealing. The contact area of a base body and the brazing filler metal is increased through the dovetail-shaped nanometer microstructure machined through femtosecond laser, a mechanical interlocking foundation is formed, the wettability and the diffusivity of an interface can be improved in cooperation with magnetron sputtering of the Ti layer and subsequent annealing treatment, and then the performance gradient transition of the four layers of gradient brazing filler metal films is achieved. In combination with Ar-H2 mixed plasma bombardment and ceramic layer precise polishing and cleaning, metallurgical reaction conditions of a brazing interface can be optimized, and meanwhile, heat input in the welding process can be controlled through synchronous scanning of the optical fiber laser and the plasma arc and a dynamic temperature feedback regulation and control mechanism.

This application provides a NiFe-LDH oxygen evolution electrode and its preparation method. The preparation method of the NiFe-LDH oxygen evolution electrode includes the following steps: using a conductive substrate as the working electrode, it is placed in a first electroplating solution for a first electrodeposition treatment. The first electroplating solution contains a first ferrous salt, a first nickel salt, and polytetrafluoroethylene (PTFE), and a first catalyst layer is deposited on the conductive substrate to form a first catalyst layer. This application forms a first catalyst layer by electrodepositing a conductive substrate in an electroplating solution containing a first ferrous salt, a first nickel salt, and PTFE. The first catalyst layer has a heterogeneous surface composed of hydrophilic catalyst active centers and dispersed hydrophobic PTFE sites, which can significantly reduce the average desorption diameter of bubbles, shorten bubble residence time, improve mass transfer efficiency, eliminate bubble shielding effect, and enhance the bonding strength between the catalyst layer and the conductive substrate, as well as the interior of the catalyst layer, thereby improving the mechanical stability and service life of the electrode.

The invention provides a high-flexibility tear-resistant epoxy structural adhesive as well as a preparation method and application thereof. The epoxy structural adhesive is prepared by mixing a component A and a component B, on the basis of the total weight of the component A, the component A comprises the following components in percentage by weight: 34-70% of modified epoxy resin, 5-30% of bisphenol A type epoxy resin, 2-6% of benzyl alcohol, 8-15% of an epoxy reactive diluent, 0.2-1.5% of a defoaming agent, 1-5% of a thixotropic agent, 5-40% of filler and 1-4% of epoxy color paste; on the basis of the total weight of the component B, the component B comprises the following components in percentage by weight: 55-75% of polyether amine, 5-15% of bisphenol A epoxy resin, 5-10% of benzyl alcohol and 10-20% of dodecylphenol. The mixing mass ratio of the component A to the component B is (3.7-7): 1. The modified epoxy resin and the bisphenol A epoxy resin are compounded, and an optimized curing system is combined, so that the flexibility and the tear resistance of the structural adhesive are remarkably improved while the high strength of the epoxy resin is maintained, and the structural adhesive is suitable for structural bonding in the fields of buildings, automobiles, electronics and the like.

This invention discloses a method for heat regulation of snow shelters based on snow-covered feature image recognition, belonging to the field of image recognition technology. The method includes the following steps: acquiring a continuous image brightness change sequence of the snow shelter surface; extracting brightness values ​​at different time points for the same spatial location; constructing a brightness time evolution matrix corresponding to each spatial location to characterize the change law of the snow shelter surface brightness over time; and based on the brightness time evolution matrix, trajectories are marked for regions where the brightness shows a continuous decreasing trend in the time dimension and a continuous translation feature in the spatial dimension, forming a shadow migration region sequence. This invention eliminates dynamic shadow interference by constructing a brightness time evolution matrix, avoiding heat distribution shifting with shadows, and achieving accurate identification and stable heating of the actual snow-covered area. Simultaneously, it dynamically monitors the melting trend during heating, increasing heat intensity when stagnation occurs to suppress ice shell formation and improve operational safety.

The application relates to the technical field of building materials, and discloses a mortar containing nanomaterials and a preparation method thereof, the mortar being composed of 70-80 parts by weight of cement, 8-12 parts by weight of fly ash, 0.4-0.5 parts by weight of a polycarboxylate water reducing agent, 0.4-0.6 parts by weight of hydroxypropyl methylcellulose, 1-2 parts by weight of nanomaterials, 2-3 parts by weight of modified silk fibroin and 40-50 parts by weight of water. The modified nanosilica is modified by gamma-aminopropyl triethoxysilane, the modified cubic nanometer calcium carbonate is modified by fumaric acid, sodium stearate and palmitic acid, and the modified silk fibroin is prepared by being grafted and modified by a double-aminopropyl-terminated polysiloxane. The mortar is treated by optimizing component collocation, modifying the nanomaterials and the silk fibroin, the mechanical properties, the durability and the crack resistance of the mortar are remarkably improved, and the cost is controllable.

The application discloses a reef limestone underground chamber damping system and belongs to the field of damping devices. The reef limestone underground chamber damping system comprises an elastic bearing assembly, micro-grouting hole pipelines, composite variable resistors and pressure sensors. The elastic bearing assembly comprises basalt micro-tendon and stainless steel energy dissipation nodes. A plurality of basalt micro-tendons form a constraint network along the circumference and axis of the chamber on the inner wall of the chamber. The stainless steel energy dissipation nodes are arranged at the intersection connection between the basalt micro-tendons. A plurality of micro-grouting hole pipelines are arranged in the constraint network along the axis of the chamber. The pressure sensors are embedded in the rock above the chamber. A plurality of composite variable resistors are arranged at the arch foot of the chamber. The three-stage collaborative mechanism of "basalt micro-tendon constraint-SMA-MRF collaborative energy dissipation-SMA heating phase change recovery and micro-grouting" solves the adaptability bottleneck of traditional anti-seismic technology in reef limestone underground space, and improves the anti-seismic performance and long-term service reliability.

The invention provides negative temperature type quick-hardening early-strength repair mortar and a preparation method thereof. The negative-temperature quick-hardening early-strength repair mortar is suitable for concrete in alpine regions, and is prepared from the following raw materials: quick-hardening sulphoaluminate cement, a thermal activator, standard cement, a mineral admixture, polyacrylate redispersible latex powder, fibers, a negative-temperature admixture, a nano material, a defoaming agent, fine aggregate, a water reducing agent and water. The repair mortar has good early compressive strength and bonding strength, ensures sustainable development of middle and later performances, does not shrink, and can meet the repair requirements of infrastructures in a negative temperature environment. The invention also provides a preparation method of the negative temperature type rapid hardening early strength repair mortar.

The invention relates to a high-carbon steel continuous casting billet center quality control method, and belongs to the technical field of high-carbon steel continuous casting billet preparation methods. In order to solve the problems that an existing high-carbon steel continuous casting billet is prone to being low in center density, obvious in porosity and shrinkage cavity defect and serious in segregation, the center quality control method for the high-carbon steel continuous casting billet is provided, a converter / electric furnace-refining-vacuum-continuous casting technology is adopted, and the C content, the P content and the S content of finished steel are controlled; according to the tundish molten steel superheat degree, the pulling speed is controlled in a linkage mode, the crystallizer cooling water amount is 2450 L / min, the crystallizer electromagnetic stirring parameter is 150 A / 2 Hz, and the tail end electromagnetic stirring parameter is 400 A / 6 Hz. According to the method, smelting-continuous casting full-process closed-loop control is adopted, parameters of all working procedures are cooperatively regulated and controlled, impurities are controlled from the source, the superheat degree and the pulling speed are accurately controlled, center segregation, looseness, shrinkage cavities and microcracks of the high-carbon steel continuous casting billet are effectively restrained, and the quality stability and the machining qualification rate of the casting billet are remarkably improved.

The application discloses a kind of high-performance glass fiber reinforced polypropylene composite material and preparation method thereof, it is related to high molecular composite material technical field;The application constructs the co-continuous gradient transition layer by polypropylene oligomer between glass fiber surface and polypropylene matrix, the polypropylene oligomer in the transition layer is gradually decreased in concentration in the direction from glass fiber surface to polypropylene matrix, concentration adjacent glass fiber surface is higher than adjacent polypropylene matrix concentration, so that there is no clear interface boundary between glass fiber and polypropylene matrix;The application passes through high concentration and low concentration polypropylene oligomer solution by layer gradient impregnation process in sequence by glass fiber, after drying, and polypropylene matrix is fused and is compounded so that gradient transition layer and matrix form molecular chain entanglement network, stress transmission mode is changed from jumping type to continuous type, and stress concentration point in traditional two-phase structure is eliminated.

The invention relates to a high-nickel ternary positive electrode material, a preparation method of the high-nickel ternary positive electrode material, a positive plate and a battery. The high-nickel ternary positive electrode material comprises secondary particles formed by aggregating primary particles, the high-nickel ternary positive electrode material satisfies the following conditions: in the primary particles of the secondary particles, the ratio A [101] / A [104] of the total surface area A [101] of the [101] crystal face to the total surface area A [104] of the [104] crystal face satisfies 0.05 < = A [101] / A [104] < = 0.3; the concentration of the cobalt element in the secondary particle is in gradient distribution which is sequentially decreased from the surface to the center, and the cobalt element concentration C [surface] in the surface area of the secondary particle and the cobalt element concentration C [core] in the core area of the secondary particle meet the condition that (C [surface]-C [core]) / C [core] is larger than or equal to 0.05 and smaller than or equal to 0.2. According to the scheme provided by the invention, the low-temperature discharge capacity, the high-temperature storage stability and the long cycle life of the ternary material can be synergistically improved.

The invention discloses a tungsten diboride-based composite nano multilayer film as well as a preparation method and application thereof. The thin film comprises a chromium transition layer and a composite nanometer multilayer structure which are sequentially arranged on the surface of a base body in a stacked mode in the thickness direction of the thin film, the composite nanometer multilayer structure comprises a plurality of periodic units arranged in a stacked mode, and each periodic unit comprises a chromium carbide nanometer layer and a tungsten diboride-carbon nanometer layer. The preparation method comprises the following steps: depositing a chromium transition layer on the surface of a substrate by adopting a magnetron sputtering technology, sequentially laminating and depositing a chromium carbide nano layer and a tungsten diboride-carbon nano layer on the chromium transition layer to form periodic units, and repeatedly preparing a plurality of periodic units to prepare the thin film. The film has the advantages of high temperature resistance, extremely low friction, strong binding force and the like, and can be applied to substrate surface protection in an extreme environment.

This application relates to a corrosion inhibitor and its preparation method for circulating water in coastal high-chlorine environments of steel plants, belonging to the technical field of circulating water treatment and corrosion inhibitors. The chemical composition of the corrosion inhibitor, by mass fraction, includes: imidazoline corrosion inhibitor: 20%~23%, azole corrosion inhibitor: 15%~18%, surfactant: 7%~10%, halogen promoter: 1%~3%, zinc salt: 1%~3%, biomass-based scale inhibitor: 1%~5%, bactericide: 1%~5%, defoamer ≤3%, and water: 30%~54%. Through the synergistic effect of its components, the corrosion inhibitor can form a dense and stable composite protective film on the carbon steel surface, effectively blocking the electrochemical corrosion of the steel matrix by chloride ions in a high-chlorine environment, and maintaining structural stability at high temperatures. This corrosion inhibitor also possesses excellent scale inhibition performance and environmental friendliness. The preparation process of the corrosion inhibitor is simple and cost-controllable, which can significantly extend the service life of key equipment in the circulating water system of steel plants in coastal high-chlorine environments, reduce maintenance costs, and ensure long-term stable operation of the system.

The invention belongs to the technical field of metal organic chemical vapor deposition (MOCVD) equipment, and particularly relates to a low-stress MOCVD graphite base and deposition equipment. The graphite base comprises a base body, and at least one stress releasing groove is formed in the outer circle area of the base body. The stress release grooves can be formed in the working face and / or the side face of the outer circle of the base body, additional deformation space is provided for materials, and the stress distribution path is changed, so that stress concentration of the base body in the high-temperature service process is effectively reduced, especially the tensile stress at the outer circle is effectively reduced, and the service life of the base body is prolonged. Therefore, the surface silicon carbide coating is prevented from generating microcracks due to overlarge stress, the corrosion resistance of the graphite base is remarkably improved, and the service life of the graphite base is remarkably prolonged. The stress can be reduced by 35% at most, and the service life of the base is prolonged by 22%. Meanwhile, the invention further relates to metal organic chemical vapor deposition equipment comprising the graphite base.

According to the composite corrosion inhibitor etching liquid and the preparation method and application thereof, a composite corrosion inhibition system composed of the first corrosion inhibitor and the second corrosion inhibitor is introduced into an acid etching system, and selective removal of a copper seed layer under different etching conditions is achieved; according to the composite corrosion inhibition system, the corrosion defect of the surface of a copper electrode can be remarkably reduced, the surface appearance can be improved, the lateral corrosion depth can be reduced, and meanwhile complete etching of a residual copper seed layer in a non-electrode area is not affected. The two types of nitrogen-containing heterocyclic corrosion inhibitors generate a synergistic adsorption effect on the copper surface by utilizing the molecular structure and adsorption behavior difference to form a compact and stable composite protection layer, so that the synergistic regulation and control on the overall corrosion rate and the local lateral corrosion behavior are realized. The composite corrosion inhibitor etching liquid has the advantages of being good in etching uniformity, remarkable in lateral erosion inhibition effect, wide in process window and suitable for industrial application.