256 results about "Surface engineering" patented technology

The invention discloses a double-PHA barrier system for a paper-based container and a paperboard as well as a preparation method and application of the double-PHA barrier system, and belongs to the technical field of paper-based material surface engineering and green packaging. The system sequentially comprises a paper base material, a water-based PHA dispersion hole sealing layer and a PHA extrusion compact layer from inside to outside. According to the invention, the micron-sized PHA dispersoid without cell debris is utilized, so that an efficient hole sealing effect which is difficult to achieve by a high coating amount in a traditional process can be achieved by only needing an extremely low coating amount, and the pinhole defect of an extrusion layer is eliminated from the source. And in cooperation with the modified PHA extrusion layer with the specific crystallinity, the problem of micro-cracking of a single coating during edge rolling forming is cooperatively solved. According to the system, excellent barrier performance is achieved through a thinner bio-based structure, and meanwhile the system has a wide heat sealing window and excellent repulp recycling performance. Compared with the prior art, on the premise that high performance is guaranteed, the consumption amount of packaging materials and the environmental burden are remarkably reduced.

The invention relates to the technical field of surface engineering, discloses a method and a system for preparing a yttrium fluoride composite ceramic coating through atmospheric plasma spraying, and aims to solve the problems that the yttrium fluoride coating generates a brittle aluminum fluoride layer on the surface of an aluminum substrate due to fluorine ion diffusion, so that the bonding strength is low, and the yttrium fluoride coating is easy to peel off and lose efficacy. The method comprises the following steps: sequentially carrying out mechanical polishing, ultrasonic cleaning and sand blasting roughening on an aluminum base material; preparing composite powder formed by mixing yttrium fluoride, yttrium oxide and nanometer aluminum oxide according to the mass ratio of 75: 20: 5; sequentially depositing a yttrium oxide transition layer, a composite barrier layer and a yttrium fluoride functional layer by adopting atmospheric plasma spraying; and finally carrying out vacuum post-heat treatment. According to the system, through the synergistic effect of the three layers of gradient structures, the transition layer forms an yttrium aluminate metallurgical bonding interface, the barrier layer inhibits fluorine ion diffusion through the dual mechanisms of nanometer aluminum oxide physical barrier and yttrium oxide chemical adsorption, and the functional layer guarantees the plasma erosion resistance. According to the method, the bonding strength of the coating is remarkably improved to 50 MPa or above, the porosity is lower than 3%, stripping is avoided under 500-hour high-energy plasma bombardment, the process cost is reduced by 40%, and the method is suitable for cavity protection of semiconductor etching equipment.

The invention belongs to the technical field of hard alloy surface engineering, and particularly relates to an MT-TiCN gradient coating of a hard alloy cutter and a preparation method of the MT-TiCN gradient coating. The coating sequentially comprises a TiN bottom layer, an MT-TiCN gradient layer, a transition layer and an Al2O3 layer from inside to outside, wherein the C / N atomic proportion of the MT-TiCN gradient layer is in gradient distribution from rich N to rich C in the thickness direction. The coating is prepared through a medium-temperature chemical vapor deposition process, the internal stress of the coating is effectively relieved, and the bonding strength, toughness and wear resistance of the coating and a matrix are remarkably improved.

The invention provides a gradient nano composite high-entropy alloy coating system with a self-monitoring function and a preparation method, and relates to the technical field of material surface engineering.The system comprises a functional gradient coating module used for achieving gradient dispersion distribution of nano ceramic particles on the curved surface of a shield hob so as to form a gradient nano composite high-entropy alloy coating; the fiber bragg grating sensing module is used for collecting strain data of the shield hob through a fiber bragg grating sensor integrated on the shield hob; the surface thermal image monitoring module is used for collecting temperature data and image data of the surface of the shield hob through an infrared thermal imager; and the self-adaptive repairing module is used for determining repairing parameters of the shield hob and generating a repairing instruction, so that self-adaptive repairing is carried out on the shield hob through preset repairing equipment according to the repairing instruction. According to the invention, the sensor network is successfully integrated in the gradient coating, and integrated fusion of structural health monitoring and protection functions is realized.

The invention belongs to the technical field of inorganic chemical material preparation, and discloses a high-selectivity crystallization and impurity migration inhibition method of high-purity magnesium hydroxide. The method comprises the following steps: a phenylphosphonic acid surface modifier is introduced in the initial stage of crystallization, molecules of the phenylphosphonic acid surface modifier selectively occupy high-activity Mg < 2 + > sites of a magnesium hydroxide crystal face through bidentate coordination, and a molecular-level interface barrier with steric hindrance and electrostatic repulsion effects is formed, so that a Ca < 2 + > migration path is specifically blocked, and Mg < 2 + > crystallization is not influenced. The preparation method of the high-purity magnesium hydroxide is high in selectivity, high in efficiency, low in cost and environmentally friendly, the interface adsorption behavior of calcium ions is accurately intervened in the initial stage of crystallization through a molecular level surface engineering means, the technical bottleneck that impurity migration and lattice doping are difficult to control in a traditional process is fundamentally solved, and the preparation method is suitable for industrial production. And a brand new technical path is provided for green manufacturing of high-performance inorganic functional materials.

The invention provides a method for preparing a high-entropy alloy coating through an atmosphere plasma spraying and laser remelting composite technology, and belongs to the technical field of surface engineering. The method comprises the following steps that firstly, AlCoCrFeNi high-entropy alloy spraying powder is prepared through a vacuum gas atomization method; then, the surface of the base body is subjected to sand blasting roughening and preheating treatment; then, a high-entropy alloy spraying layer is prepared on the surface of the base body through atmospheric plasma spraying; and finally, the spraying layer is subjected to high-temperature rapid solidification through laser remelting treatment, and the composite coating which is compact in structure and high in bonding strength is formed. By optimizing spraying and remelting process parameters, the problems that a traditional plasma spraying coating is high in porosity and poor in binding force, cracks are likely to be generated in laser remelting and the like are effectively solved, the hardness, compactness and comprehensive performance of the coating are remarkably improved, and the coating is suitable for surface protection of parts under the harsh working conditions of high temperature, abrasion, corrosion and the like.

The invention discloses an ultrasonic abrasive flow surface texture machining device and method based on an auxiliary magnetic field, and belongs to the field of precision machining and surface engineering. The ultrasonic abrasive flow surface texture machining device comprises a workbench, an ultrasonic vibration generating device, a magnetic field generating device, an abrasive flow machining system and a three-dimensional motion platform. The composite abrasive particle suspension is composed of a basic solution, carbonyl iron powder magnetic particles and silicon carbide abrasive particles. According to the method, magnetic particles are guided by a magnetic field to form a chain along magnetic lines of force, ultrasonic high-frequency impact is combined, abrasive materials are driven to impact the surface of a workpiece in order, a submicron texture with the consistent direction and the uniform size is formed, the depth ranges from 0.2 micrometer to 2 micrometers, and the width ranges from 1 micrometer to 20 micrometers. Texture parameters are flexibly regulated and controlled through magnetic field and ultrasonic parameters, and the method has the advantages of being high in machining precision, high in controllability, low in cost, environmentally friendly and recyclable, is suitable for precise parts of bearings and cutters, and can remarkably improve the tribological performance and wettability of the parts.

The invention relates to the technical field of industrial automation and surface engineering, and discloses a coating equipment coating thickness intelligent detection control system based on machine vision, and the system comprises a pneumatic perturbation modulation spraying module which is used for introducing artificial ripples with characteristic wave numbers into a wet film in the spraying process; the transient differential deflection sensing module is used for acquiring transient morphology data reflecting the leveling process of the wet film by adopting a double-trigger imaging technology; the frequency-selecting damping rheological decoupling module is used for extracting attenuation characteristics of ripples in a frequency domain, eliminating the influence of a coating viscosity variable through a rheological dynamic model, and resolving the real physical thickness of the wet film; and the self-adaptive predictive control module adjusts the paint flow or the moving speed of the spray gun based on the thickness deviation. According to the method, high-precision online measurement under the condition that the viscosity of the coating is unknown is realized by utilizing a double-frequency decoupling mechanism, the time lag of a spraying process is overcome by combining Smith pre-estimation control, and the control precision of the thickness of the coating is ensured.

The invention belongs to the technical field of surface engineering, and relates to a preparation method of a protective coating for a metal connector of a solid oxide battery. A compact transition metal oxide inner layer is deposited on a metal substrate in a reactive sputtering mode, then a transition metal alloy outer layer is deposited in a metal sputtering mode, a transition metal oxide / transition metal alloy composite coating is formed, and a spinel protective layer is formed after annealing treatment. According to the method, a transition metal oxide inner layer is used as a diffusion barrier layer, diffusion of elements such as Cr from a substrate to a coating and diffusion of oxygen to the substrate in the high-temperature annealing and long-term service process are effectively inhibited, and therefore the thickness of a reaction layer and the thickness of a thermal growth oxide layer are remarkably reduced. The composite coating is compact in structure, stable in component, good in matching with the thermal expansion coefficient of the substrate, excellent in oxidation resistance and low in surface specific resistance, and capable of effectively improving the long-term operation stability and prolonging the service life of the SOC connector.

The invention relates to the technical field of metal material surface engineering and equipment remanufacturing, in particular to an early acoustic emission diagnosis and laser cladding repair method for thermal fatigue cracks in a mold service process, which comprises the following steps: S1, synchronously acquiring and preprocessing multi-source heterogeneous data; stress wave signals are collected in real time through a broadband acoustic emission sensor array permanently integrated on the surface of a mold cavity, the frequency response range of the sensor is 100 kHz to 1 MHz, and the sensitivity is not lower than 95 dB. According to the method, accurate identification and positioning can be realized at the initial stage of crack initiation through multi-modal sensing fusion and a deep learning algorithm, the diagnosis accuracy is remarkably higher than that of a traditional offline detection method, and precious time is won for subsequent repair.

The invention relates to the technical field of material surface engineering and metallurgical equipment, in particular to a composite coating for prolonging the service life of a crystallizer copper plate and a plasma spraying preparation method thereof.The composite coating comprises, by mass, 35%-55% of chromium, 20%-55% of nickel, 5%-10% of titanium diboride, 0.1%-0.3% of niobium and the balance chromium carbide and inevitable trace impurity elements. According to the invention, titanium diboride and chromium carbide are used as main hard reinforcing phases, so that the coating shows excellent wear resistance at normal temperature and high temperature; a hollow graphite electrode is adopted in the spraying process, plasma arc is generated, and meanwhile an ablation product (carbon) provides a carbon source for formation of chromium carbide; the titanium powder and the boron powder are subjected to an in-situ reaction in a plasma arc to generate titanium diboride, and the in-situ synthesis technology enables hard phase particles to be fine and uniformly distributed, and forms a firm interface with a metal binding phase, so that the problems of interface pollution and weak combination caused by the addition of the hard phase are avoided.

The application discloses a WC reinforced tin-based babbitt alloy composite coating and an ultrahigh-speed laser cladding preparation method thereof, and belongs to the technical field of laser additive manufacturing and surface engineering. The coating is composed of WC particles and a SnSb11Cu6 matrix, the WC particles are uniformly and dispersedly distributed in the matrix, and the coating is free of cracks and through pores. The preparation method comprises the following steps: mixing WC particles with SnSb11Cu6 powder, drying, and then cladding on a 20 steel matrix by using an ultrahigh-speed laser cladding (EHLA) technology. Compared with a pure babbitt alloy coating, the hardness of the coating is increased by 45%, and the wear rate is reduced by 37%, the hardness and wear resistance are simultaneously improved, and the WC particle agglomeration and excessive melting are avoided, so that the coating is suitable for surface strengthening and remanufacturing of sliding bearing bushings.

The invention relates to the crossing field of wire and cable manufacturing and surface engineering technology, and discloses a preparation method of a corrosion-resistant aluminum or aluminum alloy wire, the wire and application thereof, and the preparation method comprises the following steps: carrying out surface pretreatment to obtain a cleaned aluminum or aluminum alloy monofilament and a cleaned aluminum-clad steel core monofilament; the surfaces of the cleaned aluminum or aluminum alloy monofilament and the cleaned aluminum-clad steel core monofilament are subjected to shot blasting treatment through a shot blasting medium, and the shot-blasted aluminum or aluminum alloy monofilament and the shot-blasted aluminum-clad steel core monofilament are obtained; performing pure aluminum wire spraying treatment on the surfaces of the shot-blasted aluminum or aluminum alloy monofilaments and the shot-blasted aluminum-clad steel core monofilaments by adopting electric arc spraying equipment to obtain sprayed aluminum or aluminum alloy monofilaments and sprayed aluminum-clad steel core monofilaments; the sprayed aluminum or aluminum alloy monofilament and the sprayed aluminum-clad steel core monofilament form an aluminum stranded wire with a layered structure through a wire stranding technology; and carrying out hole sealing treatment on the aluminum stranded wire with the layered structure through anti-corrosion grease. According to the invention, the corrosion resistance and wear resistance of the wire in a severe environment are improved.

The invention discloses a high-corrosion-resistance coating material with a high-entropy effect and an amorphous effect and a preparation method of the high-corrosion-resistance coating material, and belongs to the technical field of surface engineering and functional materials. The high-entropy amorphous alloy powder comprises the following alloy raw materials: 21-22 wt% of Fe; % of Co: 22 to 25 wt. % of Cr: 19 to 20 wt.%; % of Mo: 18 to 19 wt.%; % of Ni: 11 to 12 wt.%; % of B: 1.5 to 3.0 wt.%; %, Si: 2.0 to 4.5 wt.%. According to the high-corrosion-resistance coating material with the high-entropy effect and the amorphous effect, the porosity of the coating material is 3.2% or below, the amorphous phase content is 85% or above, and the average microhardness reaches 1120-1180 HV 0.1. The coating provided by the invention shows lower corrosion current, wider passivation interval and higher hardness in a corrosive medium, and is suitable for long-term protection of ocean, aviation and energy equipment.

This invention belongs to the field of laser surface engineering and metal matrix composite technology, and provides a Ti / Nb microalloyed Inconel 625 toughening coating, its composite powder, and preparation method. The composite powder is composed of gas-atomized Inconel 625 alloy powder, titanium powder, and niobium powder, with a Ti to Nb mass ratio of (0.8–1.2):1 and a total addition amount of 0.8–1.5 wt%. A dual-laser cladding process is employed. An initial coating is first formed by laser cladding in an inert atmosphere, followed by in-situ pulsed laser shock blasting when cooled to 900–1000℃. After slow cooling, a toughened coating is obtained. The resulting coating contains 10–20 nm dispersed Ni3(Nb,Ti) composite γ-rays. , The coating contains no Ni2(Nb,Si) Laves phase. It exhibits both high strength and high toughness, along with excellent high-temperature stability.

The invention belongs to the field of metal material surface engineering, and provides a high-strength wear-resistant shell alloy material and a preparation method thereof. According to the invention, a synergistic process route of alloy component optimization design, surface mechanical rolling and gas nitriding composite strengthening is adopted, and a double-layer gradient structure of a gradient nanocrystalline strengthening area and a nitriding diffusion area is constructed on a carbon-manganese-silicon-chromium-molybdenum-nickel-vanadium-niobium alloy matrix; gradient matching of surface layer superhardness and core part toughness with the surface Vickers hardness being 850-1100 HV0.1 and the core part Vickers hardness being 350-550 HV1 is achieved, the thickness of a gradient nanocrystalline strengthening area is 50-300 microns, the thickness of a nitriding diffusion area is 0.30-0.60 mm, the room-temperature tensile strength is 1100-1600 MPa, the percentage elongation after fracture is 8-20%, and the hardness of the surface layer superhardness and the core part toughness is not larger than 100%. The cross-domain coupling contradictions that extremely high hardness and overall toughness of the surface of a shell type wear-resistant material are difficult to consider at the same time and the residual stress gradient and the dimensional stability are difficult to control are solved, and the method has wide application value in manufacturing of wear-resistant parts such as shells, shells and protective covers under the high-strength wear working condition.

The invention discloses a high-durability mask system and an application method of the high-durability mask system in mechanical shot peening selective area strengthening, and belongs to the technical field of surface engineering. The invention provides a mask design of a multi-layer composite structure, a precise positioning and fixing system and a special process parameter system. The mask plate adopts a composite structure of the matrix layer, the wear-resistant layer and the anti-fatigue layer, so that the shock resistance and the wear resistance of the mask plate are improved; the positioning system is beneficial to keeping the stability and the repeated positioning precision of the mask plate under the working condition of strong vibration; and the special process parameters are matched and optimized aiming at the application scene of the mask plate. The invention aims to improve key technical problems when a mask shielding method is applied to a mechanical shot peening process, improve the precision and efficiency of selective shot peening strengthening, reduce the comprehensive manufacturing cost, and enable the service life of a mask system and the boundary precision of a selective strengthening region to be generally superior to those of a traditional scheme. And the method has a certain economic advantage while the fatigue performance is improved.

The application provides a preparation method of a laser-induced graphene composite film based on a biomimetic multi-level structure, the composite film and application. It relates to the fields of material surface engineering and deicing technology, and the preparation method comprises the following steps: cleaning and drying pretreatment of a polyimide film substrate; through selective scanning by a pulsed laser, a laser-induced graphene layer is generated in situ on the substrate surface synchronously, and a biomimetic multi-level structure containing a periodic microporous array and a three-dimensional porous graphene network is constructed; the product is immersed in a nano-hydrophobic solution for modification and solidification to form a three-level hydrophobic coating; annealing treatment is performed under inert gas protection to eliminate internal stress, and the composite film is obtained after cooling. The film has super-hydrophobicity, low ice adhesion strength and high efficient light-heat conversion capacity. The application aims to solve the safety and efficiency problems in the fields of aviation, wind power, photovoltaic and the like due to the lack of long-acting, stable, low-energy and function-integrated deicing materials.

The invention provides a low-temperature plasma spraying method for a heat-sensitive polymer matrix and a composite material, and belongs to the technical field of surface engineering. According to the method, through a system process of matrix surface pretreatment, spraying powder drying and low-temperature plasma spraying, the core is that a matrix active cooling technology is adopted in the range of 0-10 DEG C to isolate the plasma arc heat influence, and optimized sand blasting coarsening, powder granularity control and spraying process parameters are matched; and the compact Al2O3-TiO2 ceramic coating with high bonding strength is successfully prepared on a heat-sensitive epoxy resin matrix. The limitation that a traditional thermal spraying technology cannot be used for high polymer materials is broken through, the technological process is simple, the cost is low, and the obtained coating is excellent in abrasion resistance and suitable for meeting the requirement for high performance of the surface of the light high polymer material in the fields of electronic equipment, aerospace and the like.

The invention relates to the technical field of material surface engineering and extreme working condition tribology, in particular to a wide-temperature-range composite lubricating component based on multi-scale design and interface self-adaption and a preparation method of the wide-temperature-range composite lubricating component based on multi-scale design and interface self-adaption. The composite lubricating structure comprises, from inside to outside, a metal bonding layer; the composition of the diffusion barrier layer is continuously and gradually changed from the alloy composition matched with the metal bonding layer to the ceramic composition; the self-lubricating functional layer comprises a ceramic metal composite matrix and a plurality of lubricant capsules dispersed in the ceramic metal composite matrix; the lubricant capsule comprises a ceramic shell layer and at least two lubricating phases with different temperature activation characteristics wrapped by the ceramic shell layer. According to the invention, continuous and effective lubrication in a wide temperature range is realized, the friction coefficient can be stabilized below 0.3, and the problems of reduction of the binding force between a coating and a matrix and early failure are solved.

This invention discloses a CrN-W / DLC composite coating for WE43 magnesium alloy and its preparation method, belonging to the field of surface engineering and materials processing technology. The preparation method includes: pretreating the WE43 magnesium alloy substrate, placing it in a thin film deposition system, evacuating the system, introducing an Ar / N2 mixed gas, and using a Cr target for reactive magnetron sputtering deposition to form a CrN transition layer. During the deposition process, a W target is simultaneously introduced and co-deposited with the Cr target using reactive magnetron sputtering to obtain the CrN-W transition layer. Using a PECVD process, a carbon source precursor gas is introduced, and under the action of radio frequency plasma, it dissociates to form highly reactive species. These species are adsorbed, recombined, and cross-linked on the surface of the CrN-W transition layer to form a DLC functional layer, resulting in the CrN-W / DLC composite coating. The composite coating of this invention exhibits excellent bonding strength, wear resistance, and low friction performance, significantly improving the service performance of WE43 magnesium alloy.

The present application belongs to the field of aero-engine surface engineering, and particularly relates to a high-strength steel part rapid hydrogen embrittlement detection method for simultaneously performing two surface treatment processes. The method comprises the following steps: first rough machining, and then fine machining to a specified size; processing two notches on the gauge section of the test bar; performing surface treatment on the first notch and its two sides according to one process, and performing surface treatment on the second notch and its two sides according to another process; after heat treatment to eliminate hydrogen embrittlement, clamping the test bar to a testing machine, and performing sustained stretching for 200 hours under a specified load. The present application can solve the problem that different parts of an aero product need to be subjected to two surface treatment processes, and both of the two surface treatment processes need to be subjected to hydrogen embrittlement detection, and the hydrogen embrittlement detection cycle is long. The present application simultaneously performs two surface treatment processes by using one hydrogen embrittlement test bar, instead of using two hydrogen embrittlement test bars for the original two surface treatment processes.

This invention belongs to the field of laser additive manufacturing and surface engineering technology, and discloses a ternary boride Mo2NiB2 cermet and its preparation method, as well as an alloy barrel and its preparation method. The ternary boride Mo2NiB2 powder of this invention generates a stable, uniformly dispersed, high-hardness ternary boride hard phase in situ during the cladding process, endowing the alloy layer with excellent resistance to abrasive wear and corrosion. Simultaneously, a collaborative technical equipment system is formed by combining specialized internal hole laser cladding equipment, specially prepared ternary boride Mo2NiB2 cermet powder, and an optimized process integrating synchronous preheating, to overcome the technical bottleneck of internal wall cladding and ensure the acquisition of a dense, firmly bonded, and uniformly performing reinforced layer.

The invention belongs to the technical field of nuclear energy materials and surface engineering, and particularly relates to application of an MAX phase coating in a lead bismuth environment. The MAX phase coating is deposited on the surface of the structural material, so that the corrosion resistance and wear resistance of the steam generator can be remarkably improved. The result shows that under the conditions that the temperature is 450 DEG C, the normal load is 50N, the displacement amplitude is 75 microns, the vibration frequency is 25Hz and the cycle index is 106, a stable aluminum oxide oxidation layer and a compacted abrasive dust layer can be formed, so that the Ni element is effectively prevented from being dissolved, and the corrosion rate of a structural material is reduced; meanwhile, the abrasion depth of the structural material is reduced by 70% compared with that before protection, the structure is stable, the binding force is high, and the structural material is still kept complete and has no obvious peeling or failure phenomenon even in a long-cycle test.

The invention relates to the technical field of precision machining and surface engineering, and discloses an inner gear ferrule abrasive particle polishing clamp. The clamp comprises a base plate, a mold core and an end cover which are matched with an inner gear ferrule to be polished to form a closed polishing space. The mold core is installed in the inner gear ferrule, profiling teeth matched with the inner gear ferrule in tooth shape are arranged on the outer wall of the mold core along the circumference, and a machining gap is formed between the profiling teeth and the inner gear ferrule. A feeding groove and a discharging groove are alternately formed in the wall face of the mold core and are separated by profiling teeth in the circumferential direction. During machining, grinding materials enter from the feeding groove, are forced to transversely flow through the machining gap in the tangential direction of the tooth profile, and converge into the discharging groove to be discharged. Through the design of the tangential flow channel, the machining texture is consistent with the gear meshing sliding direction, and the lubricating performance of parts is remarkably improved; and a staggered indexing structure of the clamp is matched for multi-station superposition machining, so that the fluid inlet and outlet effect is effectively eliminated, and the tooth surface precision and surface quality consistency of the inner tooth ferrule are greatly improved.

This invention discloses an intelligent prediction and process optimization system for the corrosion resistance of laser-treated stainless steel based on a grain boundary feature database, relating to the fields of metal surface engineering and intelligent manufacturing technology. The invention includes a grain boundary modeling module, which performs grain boundary-related microstructure modeling on laser-treated stainless steel samples to form grain boundary feature data. Based on grain boundary-related microstructure modeling and parametric encoding with unified data description rules, this invention forms grain boundary feature data containing grain boundary types, orientation difference distributions, and special grain boundary proportions. Using this grain boundary feature data as the core master index, the corresponding laser-treated process parameters and corrosion resistance test results are associated and stored, constructing a systematic grain boundary feature database. This provides stable data support for the quantitative characterization of corrosion resistance and data-driven prediction, avoiding the problem of scattered grain boundary information that is difficult to use for decision-making.

The invention relates to the technical field of micromachining and surface engineering, and discloses a variable cross-section sampling needle tube inner wall electrochemical discharge additive and subtractive material synergistic preparation method which comprises the following steps: adsorbing magnetic nano powder to a magnet electrode handle to assemble a flexible tool electrode; the flexible tool electrode is inserted into a sampling needle tube injected with electrolyte containing silver nitrate and low-surface-energy substances, a local thermal field is generated through electrochemical discharge, and the flexible tool electrode is extruded in a reducing area to force powder to be rearranged to actively adapt to pore diameter changes. According to the method, the micro-nano nested structure is etched through electrochemical discharge, the recast layer is removed through mechanical grinding of adsorbed magnetic nano powder, antibacterial particles and low-surface-energy substances are induced to be co-deposited in situ through a discharge thermal field, and the silver antibacterial coating is formed in the micro-nano nested structure. The integrated cooperation of variable cross-section deep hole inner wall material removal, surface finishing and functional coating preparation is realized, and the inner wall of the sampling needle tube is endowed with hydrophobic and antibacterial properties.

This invention discloses an anti-ablation multi-scale composite film and a method for its synergistic preparation and application using magnetron sputtering and plasma spraying. Belonging to the field of surface engineering and thermal protective coating technology, the method includes: pretreating a resin substrate; depositing a continuous and dense metal-based thin film on the pretreated resin substrate surface using magnetron sputtering at a temperature below the resin substrate's heat distortion temperature to form an interface transition layer; and depositing an anti-plasma ablation functional layer using plasma spraying on the interface transition layer, with the resin substrate temperature not exceeding 150°C during the spraying process, resulting in an anti-ablation multi-scale composite film formed on the resin substrate surface. This invention utilizes low-temperature deposition of a dense transition layer via magnetron sputtering combined with efficient preparation of the anti-ablation functional layer via plasma spraying, avoiding thermal damage to the resin substrate. The composite film exhibits a bonding strength ≥40 MPa and a mass ablation rate <5 mg / s after 500 ablation cycles, demonstrating high reliability under high-temperature conditions and suitability for high-temperature surface protection of various resin substrate materials.

The application provides a high-entropy alloy powder and a preparation method thereof and a preparation method of an AZ91D magnesium alloy cladding layer, and belongs to the field of high-entropy alloy materials and surface engineering.The high-entropy alloy powder comprises the following components in mass fraction: Al 6.22%-8.62%, Cu 16.66%-20.59%, Co 15.40%-19.78%, Cr 13.49%-17.09%, Ni 15.33%-19.51%, Fe 14.55%-18.78% and Ti 4.78%-10.36%.The application designs the element components and the equimolar ratio of the components, so that the cladding layer has excellent wear resistance, corrosion resistance and structural stability, and is more suitable for the laser cladding process in physical and chemical properties, and the effects of enhancing the comprehensive performance of the cladding layer, reducing the thermal crack sensitivity of the cladding layer, improving the cladding efficiency and the interface bonding quality are achieved.

This invention relates to the fields of materials surface engineering and metallurgical equipment technology. Specifically, it relates to a composite coating for improving the lifespan of copper plates in crystallizers and its plasma spraying preparation method. The chemical composition, by mass percentage, includes: 35%-55% chromium, 20%-55% nickel, 5%-10% titanium diboride, 0.1%-0.3% niobium, with the balance being chromium carbide and unavoidable trace impurities. In this invention, titanium diboride and chromium carbide are used as the main hard reinforcing phases, enabling the coating to exhibit excellent wear resistance at both room temperature and high temperature. During the spraying process, a hollow graphite electrode is used, generating a plasma arc. Simultaneously, the ablation products (carbon) provide a carbon source for the formation of chromium carbide. Titanium powder and boron powder undergo an in-situ reaction in the plasma arc to generate titanium diboride. This in-situ synthesis technology results in fine and uniformly distributed hard phase particles, forming a strong interface with the metal binder phase, avoiding the problems of interface contamination and weak bonding caused by externally added hard phases.