347 results about "Surface engineering" patented technology

The invention provides an aeronautical part multi-process parameter cooperative surface treatment standardization optimization method, and relates to the technical field of aeronautical manufacturing surface engineering, and the method comprises the following steps: S1, constructing a process parameter hierarchical coding system and a correlation mapping model; s2, establishing a parameter solving method based on multi-objective collaborative optimization; s3, constructing a modular process chain; s4, establishing real-time monitoring and closed-loop control of multi-source data fusion; s5, establishing a digital simulation body and verifying the digital simulation body; and S6, constructing a whole-process quality tracing database. According to the method, dynamic collaborative optimization of multiple process parameters is realized through parameter hierarchical coding, association mapping and a cross-process-chain intelligent decision model, the parameter conflict rate is reduced, and the process decision efficiency is improved. Meanwhile, a self-adaptive optimization engine based on reinforcement learning can correct process parameters in real time, the batch consistency of key performance indexes is improved, and the process stability and the product quality are remarkably improved.

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 metal surface engineering, and discloses a laser cladding layer based on copper-magnesium-titanium-zirconium gradient design and a preparation method thereof.The preparation method comprises gradient structure design, a microstructure strengthening mechanism, a laser cladding process and thermal field control. By constructing a copper-magnesium-titanium component gradient transition structure and matching the thermal expansion coefficient difference between a matrix and a coating in real time, interface thermal stress accumulation can be dynamically inhibited, the crack defect caused by thermal expansion mismatch of a traditional cladding layer is avoided, ordered diffusion of elements at the interface is promoted through gradual change of gradient components, and the thermal conductivity of the cladding layer is improved. The metallurgical bonding reliability of the coating and a base body is improved, meanwhile, a stable coating is formed, the long-term service stability under the extreme working condition is guaranteed, a microstructure strengthening mechanism regulation and control means is adopted, the coating has a stable and effective protective barrier in a corrosive medium environment, and the problem of performance degradation caused by structure defects of a traditional cladding layer is solved.

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 provides a preparation method of a high-temperature wear-resistant high-entropy alloy layer with a heterostructure, and belongs to the technical field of metal materials and surface engineering thereof. According to the method, a CoCrFeNiTi high-entropy alloy cladding layer is deposited on the surface of a base body through the laser cladding technology, and the thickness of the cladding layer is controlled to be 0.5-2 mm. The component of the cladding layer is CoCrFeNiTi, the atomic ratio content of Ti is controlled not to exceed 8%, so that the structure of the cladding layer is an FCC phase, and cracking of the cladding layer induced by precipitation of a BCC phase is avoided. A high-entropy alloy cladding layer is heated to 550-950 DEG C and subjected to heat preservation for 2-4 h for annealing treatment, alloy elements in the cladding layer are promoted to be separated out, and small heterogeneous strengthening phases such as a Ni3Ti phase and a laves phase are generated in situ. According to the method, a heterogeneous strengthening structure is formed under the condition of not adding exogenous elements, the strength and hardness and high-temperature wear resistance of the cladding layer are greatly enhanced, the method has the advantages of being simple in process, low in cost, high in applicability and the like, and an effective technical scheme is provided for repairing and remanufacturing of the high-entropy alloy.

The invention belongs to the technical field of semiconductor material surface engineering and defect analysis, and provides an ultrahigh vacuum surface defect detection method and system based on a scanning tunneling microscope, and the method comprises the following steps: carrying out mechanical stripping on a bulk single crystal gallium oxide sample based on the cleavage property of a crystal, and obtaining a gallium oxide single crystal wafer with a micron thickness; placing the stripped single crystal gallium oxide sample in an ultrahigh vacuum environment, and removing atmospheric adsorbates on the surface through vacuum high-temperature annealing treatment; performing sputtering annealing cycle treatment on the surface of the preliminary annealing sample in an ultrahigh vacuum environment to generate an oxygen vacancy defect on the surface so as to obtain a post-treatment sample; the oxygen vacancy concentration, the surface cleanliness and the surface atom orderliness are verified through auxiliary characterization means (XPS, LEED); performing scanning imaging on the surface of the post-treatment sample through a scanning tunneling microscope (STM), and performing oxygen vacancy defect identification by combining with an oxygen vacancy defect STM image simulated by DFT calculation; according to the method, the atomic-scale resolution of the surface of the single crystal gallium oxide sample is detected through the scanning tunneling microscope, the oxygen vacancy defect and other various surface defects are accurately recognized, and the surface state of the sample is comprehensively evaluated.

The invention relates to the technical field of material surface engineering, and discloses a plastic surface treatment process to solve the problems that in the prior art, a plastic surface coating is poor in adhesive force and single in function, and a traditional treatment method is not environmentally friendly. The process sequentially comprises the following steps: pre-treating a base material, and obtaining a clean and stress-free base material through ultrasonic cleaning and thermodynamic stress elimination; performing low-temperature plasma surface activation, performing physical bombardment and chemical modification on the plastic surface by utilizing plasma of specific process gas in a vacuum environment, introducing a large number of active functional groups, and remarkably improving the surface energy; and preparing and applying the functional nano coating, namely forming firm covalent bonds by using the coupling agent in a coating solution containing functional nano particles and a coupling agent and the anchor points, so that the chemical coupling of the functional coating and the plastic substrate is realized.

The invention belongs to the technical field of surface engineering protective coatings, and discloses a nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a magnetron sputtering technology is adopted, a CoCrFeMnNi target serves as a cathode target material, and a corrosion-resistant high-entropy alloy coating is obtained through deposition on the surface of a base body; and then, in a three-electrode system, the corrosion-resistant high-entropy alloy coating is placed in an electrolyte containing a nitrogen heterocyclic onium salt compound to be subjected to electro-deposition, and the nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating is prepared. The corrosion-resistant inorganic-organic hybrid coating prepared by the invention has excellent corrosion resistance, can keep high stability and durability in a complex corrosion environment, and has relatively high corrosion potential and relatively low corrosion current density. The coating can remarkably prolong the service life of a structural base material, is suitable for various harsh working conditions, and provides an efficient and reliable protection solution for industrial application.

The invention discloses a method for predicting frictional wear performance of a DLC (diamond-like carbon) coating based on machine learning, and relates to the cross technical field of surface engineering and machine learning, the method comprises the following steps: collecting feature data and label data of the DLC coating, the feature data comprising image data, spectral data and numerical data; cleaning and integrating the acquired data to obtain a multi-modal data set; according to the condition of the data size, a friction and wear performance prediction model of the DLC coating is constructed; based on the obtained multi-modal data set, training a friction and wear performance prediction model of the DLC coating, evaluating the prediction performance of the model by using label data, analyzing samples with large errors, and continuously optimizing the prediction performance; and deploying the trained model in a laboratory management system or an industrial application platform, and rapidly predicting the friction coefficient and the wear rate of the DLC coating. Therefore, by adopting the method, the depiction capability of the microstructure of the DLC coating can be remarkably improved, the prediction precision is improved, and the method is suitable for various combined working conditions, simple in calculation and high in efficiency.

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 present invention discloses a method for evaluating and regulating the wear resistance of ductile iron based on the electronic work function, which relates to the technical fields of surface engineering and performance evaluation. The method includes collecting the electronic work function data and material characteristic data on the surface of ductile iron; extracting the characteristics of the electronic work function data to obtain the electronic work function characteristics; establishing a mathematical model based on the electronic work function characteristics to analyze the correlation between the electronic work function data and the material characteristic data; analyzing the relationship between the electronic work function characteristics and the wear resistance, and establishing a comprehensive evaluation model to evaluate the wear resistance of ductile iron. The present invention combines characterization techniques, complex data analysis methods and multivariate statistical models at the same time. It can not only deeply understand the connection between the electronic structure and macroscopic properties of materials, but also establish a comprehensive evaluation model to predict the wear resistance of ductile iron; this method guides the design of materials and the optimization of the production process.

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 metal surface engineering, and particularly relates to a cold-spraying high-abrasion-resistant corrosion-resistant titanium-based composite coating and a preparation method and application thereof.The preparation method of the cold-spraying high-abrasion-resistant corrosion-resistant titanium-based composite coating comprises the steps of titanium-based composite powder improvement, particle size distribution of the titanium-based composite powder, preparation of the cold-spraying high-abrasion-resistant corrosion-resistant titanium-based composite coating and preparation of the cold-spraying high-abrasion-resistant corrosion-resistant titanium The method comprises the following steps: depositing titanium-based composite powder on the surface of a base material by adopting a cold spraying process to prepare a titanium-based composite coating, and carrying out gradient heat treatment on the titanium-based composite coating to prepare the cold-sprayed titanium-based composite coating with high wear resistance and corrosion resistance. According to the method, through cooperation of composite powder modification, powder particle size grading and a gradient heat treatment process, the method has the advantages that spraying powder raw materials can be sprayed, the cost is low, and the coating structure is uniform, and the prepared titanium-based composite coating is excellent in wear resistance and corrosion resistance and can be applied on a large scale.

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 a sequence-adjustable Ti3C2Tx / GO heterojunction parallel arrangement enhanced multifunctional protective coating and a preparation method thereof, and relates to the technical field of surface engineering.The method comprises the steps that S1, epoxy electrophoretic resin and deionized water are weighed, mixed to be uniform and left to stand so that the epoxy electrophoretic resin and the deionized water can be fully cured, the cured solution is divided into two parts, and a solution A and a solution B are obtained; s2, fully protonated Ti < 3 > C < 2 > T < x > is added into the solution A; adding single-sided protonated GO into the solution B, and respectively stirring at room temperature for 1 hour to obtain a mixed solution A and a mixed solution B; s3, the mixed solution A and the mixed solution B are sequentially poured into an epoxy electrophoresis tank for electrophoretic deposition; and S4, after deposition is completed, residual liquid resin on the surface of the coating is washed away with running water, curing is conducted for 85-100 min at the temperature of 170-210 DEG C, and the multifunctional protective coating is obtained.

The invention discloses a design method of a high-toughness coating material and a related device, and relates to the technical field of surface engineering.The method comprises the steps that target coating material information is obtained; inputting the information of the target coating material into the high-toughness coating material prediction model to obtain mechanical property data corresponding to the target coating material; judging whether the target coating material has high strength and toughness or not according to the mechanical property data, and if yes, reserving the target coating material; the determination process of the high-toughness coating material prediction model comprises the following steps: processing a sample coating material system by using a high-throughput first principle to obtain a final stable crystal structure model and corresponding mechanical property data, and constructing a high-toughness coating material database; and training the high-toughness coating material prediction network based on the high-toughness coating material database to obtain a high-toughness coating material prediction model. According to the method, the coating material with high strength and toughness can be screened out through the high strength and toughness coating material prediction model.

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 relates to the technical field of metal surface engineering, and particularly provides a composite material, a preparation method and a spraying method. The composite material comprises a nickel-based alloy matrix and a high-entropy diboride reinforcement phase dispersed in the nickel-based alloy matrix, and the high-entropy diboride reinforcement phase is provided with metal cation vacancies and lattice distortion structures. The preparation method of the composite material is used for preparing the composite material. According to the composite material, the preparation method and the spraying method, the composite coating is not prone to failure due to falling of a certain material when the composite material is used for a long time in a boiler.

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 application belongs to the technical field of surface engineering protection, and discloses a transition metal compound composite coating, a preparation method and application thereof; wherein the transition metal compound composite coating is a composite multilayer structure, and comprises n same periodic structures deposited in sequence, and n is greater than or equal to 2; wherein each periodic structure comprises a titanium nitride coating and a niobium nitride coating. The application specifically discloses a high-conductivity strong-corrosion-resistance transition metal compound composite coating, and can solve the technical problems of high cost, high corrosion current density, low corrosion overpotential and poor conductivity in the prior art.

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.