14308 results about "Metallurgy" patented technology

The invention provides a titanium alloy forge piece forming characteristic detection and quality evaluation method based on machine learning. The method is applied to the technical field of artificial intelligence and quality detection and comprises the steps that temperature, pressure, deformation quantity and strain information in the titanium alloy forging process are collected in real time through a multi-mode sensor, and data preprocessing is carried out; a machine learning model is constructed and trained, the structured feature data set is input into the trained machine learning model, and a forming feature detection result of the titanium alloy forge piece is output; and the difference degree between the forming characteristic detection result and standard data in a quality standard database is calculated, the quality grade of the titanium alloy forge piece is determined according to the difference degree, and quantitative evaluation of the quality of the titanium alloy forge piece is achieved. According to the method, the detection precision of the titanium alloy forge piece is effectively improved, the calculation amount is reduced, and the self-adaptive optimization capability of the system is enhanced.

The invention belongs to the field of battery piece manufacturing, and particularly relates to a sintering method and a sintering device for a copper paste battery piece, and the method comprises the following steps: 1) covering and wrapping the battery piece brushed with a copper paste grid line with a flexible isolation film; (2) carrying out oxygen isolation on the battery piece subjected to the step (1); (3) heating the battery piece in the step (2) to the sintering or curing temperature of the copper paste to finish the sintering of the copper paste; and (4) under the state of maintaining the step (2), transferring the battery piece covered with the isolating membrane in the step (3) to a cooling area for cooling, so that the temperature of the battery piece in the step (3) is reduced to be below the oxidation temperature of the copper paste. The problem of how to prevent the copper paste grid line from being oxidized in the battery sintering process is solved.

Provided herein are methods of filling features with molybdenum (Mo) that may be used for logic and memory applications. The methods involve treating the surface of feature prior to feature fill. In some embodiments, the methods involve treating the surface of feature by exposure to a molybdenum halide. In some embodiments, the methods involve treating the surface of the feature by selective oxidation, nitridation, or halogenation. Apparatus to perform the methods are provided.

The invention belongs to the technical field of metallurgical equipment intelligent control and digital twinning, and provides a metallurgical equipment twinning HMI control system based on multi-source data, and the system comprises a multi-source data collection module which is used for collecting the multi-source data; the data fusion processing module is used for performing data fusion processing on the multi-source data by adopting a space-time alignment algorithm and a feature extraction network; the digital twinborn modeling module is used for constructing a metallurgical equipment digital twinborn model by utilizing an improved deep belief network algorithm based on the fusion processing data; the HMI interaction module is used for dynamically presenting the fusion processing data and the operation state data of the metallurgical equipment digital twinning model based on the output of the digital twinning modeling module; and the intelligent control module is used for performing closed-loop control on the metallurgical equipment by adopting a self-adaptive predictive control algorithm. According to the invention, full-process intelligent management of the metallurgical equipment can be realized, and the operation efficiency, the control precision and the reliability of the metallurgical equipment are remarkably improved.

The invention belongs to the technical field of nondestructive testing, and discloses a vector coherence factor-based thick-wall austenitic stainless steel welding seam full-focus imaging method, which comprises the following steps of: acquiring full-matrix data through a TRL area array probe, constructing an imaging area, calculating a spatial relationship, optimizing a propagation path in combination with a Fermat principle, and obtaining a full-focus imaging result; the method comprises the following steps of: firstly, extracting an instantaneous phase of an ultrasonic signal to construct a vector coherence factor, reconstructing an imaging data matrix according to the coherence factor, and obtaining a phase coherence weighted full-focusing imaging result, so as to ensure that each pixel point can obtain an optimal propagation path, thereby generating a full-focusing image data matrix by adopting a point-by-point delay superposition technology; the method can effectively improve the signal-to-noise ratio and positioning and quantification precision of the thick-wall austenitic stainless steel weld joint detection image, and has good engineering application value.

A solid electrolyte material and a preparation method therefor, a solid electrolyte, a semi-solid electrolyte, a positive electrode, and a battery. The solid electrolyte material comprises a compound represented by the following general formula: Aa(M1bM2c)Xd, wherein A comprises one or more of Li, Na, K, Cu and Ag, X is halogen, M1 is a main element, M1 is selected from among one of Ga, Y, In, Mg, Sr, Sc, Al, Fe, Zr, Hf, Ta, Nb, W, Mn, Zn, Co, Mo, Sn, Ca, Pb, Ti, Ru and a lanthanide metal element, M2 is a doping element, M2 comprises one or more elements of groups IIA, IIB, IIIA, IIIB, IVA, IVB, VA and VB, b is greater than the molar ratio of any element in M2, 0.5≤a≤5, 0.2≤b≤2, 0.2≤c≤2, d=a*ε1+b*ε2+c*ε3, ε1 is the weighted average valence of A, ε2 is the weighted average valence of M1, and ε3 is the weighted average valence of M2.

The invention relates to the technical field of numerical control machining process optimization, in particular to an aluminum alloy milling parameter optimization method based on an improved Bayesian neural network, and the method comprises the following steps: S1, building an aluminum alloy thin-wall part milling finite element model based on a Johnson-Cook constitutive model; s2, carrying out a single-factor milling experiment, and verifying the reliability of the finite element model; s3, constructing a Bayesian neural network model fused with a multi-head attention mechanism, and establishing a mapping relation between process parameters and surface quality indexes; s4, establishing a multi-objective optimization model based on the MHA-BNN prediction model, and solving by adopting an NSGA-II algorithm; and S5, performing experimental verification and analysis on an optimization result. According to the method, a multi-head attention mechanism is introduced into a Bayesian neural network, and a milled surface roughness and residual stress probability prediction model is constructed; and a multi-objective optimization framework fusing physical constraint and data driving is established, collaborative optimization of the surface roughness, the residual stress and the processing efficiency is realized, and meanwhile, the problem that a traditional deep learning method is insufficient in prediction precision under a small sample condition is solved.

The invention discloses a titanium alloy feeding implant and a preparation method thereof, and the preparation method comprises the following steps: carrying out activating treatment on a biodegradable bonding system in an inert gas environment to form an expansion-state binder precursor, and then mixing titanium alloy powder and the precursor which are proportioned in stages in a multi-stage mixing device in stages to obtain the titanium alloy feeding implant. Sequentially executing low-temperature activation, melting and dispersing operations to prepare uniform feed; carrying out vibration-assisted injection molding on the feed to generate a green body with a multi-stage pore structure; removing the binder step by step and reserving pores by adopting a synergistic degreasing process of supercritical fluid extraction, microwave decomposition and gas phase cleaning; densification sintering molding of the titanium alloy implant is realized through pre-sintering and plasma activating treatment, so that an implant finished product is formed; according to the process, through the coupling design of innovation of a biodegradable binder system and an intelligent degreasing process, on the premise that the biological safety of the titanium alloy implant is ensured, precise forming and sintering densification control of a complex pore structure are synchronously achieved.

The invention provides a metallurgical process optimization method and system for a low-oxygen low-nitrogen aluminum-vanadium alloy, and relates to the technical field of process optimizing.The method comprises the steps that correlation characteristics among process parameters are extracted through a three-layer gating map attention network, and a parameter coupling state vector is constructed in combination with a time sequence attention module; constructing a process prediction model based on the state vector, and fusing a thermodynamic equilibrium equation and a long-short term memory network to predict the oxygen and nitrogen content; a deep reinforcement learning network of a Soft Actor-Critic algorithm is adopted, the parameter coupling state vector and the oxygen and nitrogen content prediction value serve as state input, and the technological parameter adjustment amount is output; and planning and iteratively training a future adjustment strategy through Monte Carlo tree search to finally obtain an optimal process parameter combination meeting oxygen and nitrogen content constraints, thereby realizing intelligent optimization control of the metallurgical process.

The invention relates to the technical field of biomedical ceramic materials, in particular to a zirconia-based biomedical ceramic material and a preparation method thereof.The preparation method comprises the following steps: preparing a zirconia-based biomedical ceramic material on the basis of preset opening degrees of air channels of a first heating part and a second heating part in a heating assembly and a preset working state of a first stirring structure; synchronously and continuously adding a plurality of to-be-reacted substances into the first space of the container for primary reaction; after the interval is fixed, opening a circulation channel based on a preset liquid channel opening degree of the circulation channel of the first space and the second space of the container, so that the material in the first space flows into the second space, and performing a second-section reaction at a preset second temperature and a preset rotating speed of a second stirring structure to generate a precipitate; according to the invention, the materials to be reacted can be heated at a stepped temperature, and the reaction process is fully adjusted according to the ion concentration and uniformity in the detected solution, so that the high-precision preparation of the zirconium oxide-based biomedical ceramic material is stably and efficiently carried out.

The invention provides equipment for extracting lithium from electrolytic aluminum slag and a process for extracting lithium and co-producing cryolite, and relates to the technical field of solid waste treatment, the equipment comprises a bottom plate, a heating tank, an extracting tank, a filtering tank, a top cover, a driving mechanism, a switching mechanism and a mixing mechanism; the heating tank is installed on the upper surface of the bottom plate, the extraction tank is installed inside the heating tank, the filtering tank is installed inside the extraction tank, the top cover is installed on the upper surface of the filtering tank in a sealed mode, and a liquid inlet pipe and a feeding pipe are installed inside the top cover. According to the scheme, the conical mixing barrel and the linkage overturning type material mixing plate are adopted, the material mixing plate can overturn caustic soda flakes into the electrolytic aluminum slag, then the caustic soda flakes and the electrolytic aluminum slag are mixed through the material mixing rod, it can be guaranteed that the caustic soda flakes can be evenly mixed with the electrolytic aluminum slag through the design, and it is guaranteed that the caustic soda flakes can be well attached to the surface of the electrolytic aluminum slag; and rapid overheating can be avoided when the subsequent caustic soda flakes are contacted with water, so that the filter tank works more stably and safely.

The invention belongs to the technical field of electroplating process optimization, and particularly discloses a titanium alloy surface electroplating control method which comprises the following steps: dynamically generating a hanger posture configuration scheme based on workpiece three-dimensional contour data acquired in real time; a bubble distribution image and electroplating liquid flow field data are synchronously collected, and a bubble-flow field coupling feature set is generated through multi-modal fusion; performing real-time linkage adjustment on the rotation speed and the swing amplitude of the workpiece according to the coupling feature set; after electroplating is completed, plating thickness, edge integrity and surface defect data are collected, and a multi-source plating data set is formed by combining workpiece position information; historical data and real-time data are integrated to carry out hanger layout adjustment judgment, and hanger spacing dynamic reconstruction optimization is started when adjustment is needed. According to the method, multi-parameter cooperative control and closed-loop quality optimization in the electroplating process are achieved, the uniformity and integrity of a titanium alloy workpiece coating are remarkably improved, and generation of bubble related defects is effectively restrained.

The invention provides antioxidant copper powder for low-temperature slurry, low-temperature sintered copper slurry and a preparation method of the low-temperature sintered copper slurry, and belongs to the technical field of slurry for heterojunction batteries. The antioxidant copper powder comprises copper powder and a coating agent coating the surface of the copper powder; wherein the coating agent comprises acrylic acid, oleic acid and paraformaldehyde. The anti-oxidation copper powder is formed by coating the surface of the copper powder with the coating agent formed by the acrylic acid, the oleic acid and the paraformaldehyde, and the low-temperature sintering copper paste formed by matching the anti-oxidation copper powder with other components can realize low-temperature sintering in air, does not need a protective atmosphere and has good conductivity.

The invention provides a high-precision laser additive manufacturing method and device based on metal powder melting, and relates to the technical field of metal additive manufacturing, and the high-precision laser additive manufacturing device comprises a multi-element powder supply and electrification unit which is used for carrying out independent metering supply and airflow dispersion mixing on various metal powder in an inert atmosphere environment and enabling powder particles to obtain controllable charges; the electromagnetic field cooperative control unit is used for actively regulating and controlling the falling speed and the transverse track of the powder particles through the cooperative effect of a longitudinal magnetic field and a transverse electric field when the powder particles are in a charged state; the invention provides a metal powder forming technology path based on particle size active conveying and spatial positioning, and active conveying and accurate positioning of the metal powder particles in the flying process are realized by performing electrified regulation and control on single or small-scale metal powder particles and utilizing the action of an electromagnetic field. Therefore, layer-by-layer stacking forming is completed under the condition of not depending on the whole powder laying layer.

The present invention provides a method and apparatus for laser stripping a silicon carbide ingot. The method first transmits an ultrashort pulse laser beam through the first end face of the silicon carbide ingot and focuses it on a set depth layer of the ingot. A cavity-modified region and a crack-modified region are generated above the set depth layer, respectively, and scanned to form the cavity-modified layer and the crack-modified layer. A short pulse laser beam then transmits the second end face of the silicon carbide ingot and focuses it on the cavity-modified region. The beam scatters and propagates within the cavity-modified region, causing the heat from the short pulse laser beam to act on the cavity-modified region, causing cracks within the crack-modified region to grow laterally outward. Scanning is then performed to connect cracks within adjacent cavity-modified regions within the cavity-modified layer through lateral growth. This reduces the amount and length of cracks in the modified layer extending longitudinally along the silicon carbide ingot, increases the number and length of lateral crack growth, reduces cutting loss, and reduces waste.

The invention discloses a method for preparing a platinum-based alloy catalyst by using a plasma enhanced chemical vapor deposition low-temperature technology, relates to a preparation method of a platinum-based alloy catalyst, and aims to solve the technical problems that a carbon layer is not uniformly coated and metal particles of the catalyst are easy to agglomerate in a high-temperature calcination process in the existing platinum-based alloy catalyst prepared by carbon coating. The method comprises the following steps: 1, preparing Pt / C by a polyhydric alcohol reduction method; 2, pre-treating a Pt / C catalyst; 3, preparing M-Pt / C by a dipping evaporation method; 4, PECVD carbon shell coating is carried out; (5) alloying; and 6, removing a part of carbon shell to obtain the platinum-based alloy catalyst. When the Pt / C catalyst is used for preparing a membrane electrode of a proton exchange membrane fuel cell, the peak power density can reach 1.72-1.89 W / cm < 2 > under a hydrogen-air condition, which is improved by 20.3% and 32.2% compared with a membrane electrode of a commercial 20% Pt / C catalyst, and the Pt / C catalyst can be used in the field of proton exchange membrane fuel cells.

The purpose of the present invention is to provide: a steel material which is suitable as a steel structure used in a hydrogen gas environment, has excellent hydrogen absorption resistance in a hydrogen gas environment, and has excellent hydrogen embrittlement resistance; and a method for producing same.　The steel material has a specific component composition, wherein the amount of saturated hydrogen that has entered in a hydrogen gas environment at a hydrogen gas pressure of 40 MPa is less than a predetermined value. The predetermined value is 0.8 ppm by mass when the tensile strength TS of the steel material is less than 500 MPa, and is a hydrogen amount CH (ppm by mass) calculated from formula (1) when the tensile strength TS of the steel material is 500 MPa or more. (1): CH (ppm by mass) = 5.4637e-0.004 × TS (MPa) In formula (1), TS (MPa) is the tensile strength of the steel material.

The invention discloses a flue gas purification device for a sintering machine, and relates to the technical field of sintering machines, the flue gas purification device comprises a purification cylinder, the outer side of the purification cylinder is fixedly connected with a gas inlet pipe, one end of the gas inlet pipe penetrates through the inner side of the purification cylinder, and a treatment unit for purifying flue gas of the sintering machine is arranged on the upper side of the gas inlet pipe; an exhaust pipe is fixedly connected to the outer side of the purification barrel and located above the air inlet pipe, a first water pump is fixedly connected to the right side of the purification barrel, a fixing disc is arranged on the inner side of the purification barrel, and a plurality of branch plates are fixedly connected between the fixing disc and the purification barrel. According to the flue gas purification device for the sintering machine, the purification cylinder, the gas inlet pipe, the fixed pipe, the spray head and the first water pump are arranged, the spray head can spray out an alkaline solution conveniently to treat flue gas of the sintering machine, introduced gas can be dispersed conveniently through a rotating rod, a stirring plate, the fixed cylinder, a branch cylinder, a dispersion plate, a first dispersion piece and a second dispersion piece, high-concentration flue gas is evenly distributed, and the service life of the flue gas is prolonged. The flue gas purification effect is improved.

The invention provides a method for preparing an iron-based superconducting material single crystal in a microgravity environment, and belongs to the field of superconducting materials. The method specifically comprises the following steps: carrying out a microgravity crystal growth experiment in a high-temperature experiment cabinet of a space station, putting a solid-phase sintered or pre-melted rod-like raw material into a furnace body, heating and melting, then slowly solidifying, and finally growing the iron-based superconducting material single crystal with large size and extremely low defect density.

The invention discloses a water-based soldering flux for a photovoltaic N-type battery 0BB assembly and a preparation method of the water-based soldering flux, and belongs to the technical field of soldering flux. The soldering flux is prepared from the following raw materials in parts by weight: 30-60 parts of deionized water, 30-50 parts of an alcohol solvent, 2-8 parts of a high-boiling-point solvent, 1-4 parts of organic acid, 0.1-1 part of a surfactant, 0.1-1 part of an antioxidant, 0.1-1 part of a corrosion inhibitor, 0-1 part of psicose and 0-1 part of trimethylolpropane tricaprylate. According to the invention, the problem of negative influence on tension of thermosetting adhesive and alloying of a fine grid when a traditional soldering flux is applied to a photovoltaic N-type battery 0BB assembly is solved.

A method for detecting circularity of silicon carbide micro powder relates to the technical field of silicon carbide detection, and comprises the following steps: S1, turning on a flowing particle imager, preheating and then carrying out background detection; s2, adding standard particles into the sample pool, and enabling the flowing particle imager to perform automatic focusing; s3, adding the prepared silicon carbide micro powder sample into a sample pool, and detecting by using a flowing particle imager; and S4, storing the detection result, checking the silicon carbide micro powder particle image, and recording the detection result. The preparation of the silicon carbide micro-powder sample comprises the following steps: S31, adding the dried silicon carbide sample into a dry and clean beaker; s32, sequentially adding an impregnating compound, a dispersing agent and deionized water into the beaker; s33, carrying out ultrasonic dispersion; and S34, taking out the uniformly mixed sample. The method can solve the technical problem of detection failure caused by easy agglomeration of the silicon carbide sample when the flowing particle imager is used for detecting the circularity of the silicon carbide micro powder.

The invention belongs to the field of ferrous metal materials, and particularly relates to a high-strength heat-resistant ferritic stainless steel plate for a third-generation nuclear power plant and a manufacturing method of the high-strength heat-resistant ferritic stainless steel plate for the third-generation nuclear power plant, and the high-strength heat-resistant ferritic stainless steel plate comprises the following chemical components in percentage by weight: 0.01%-0.12% of C, 0.8%-1.5% of Si, 0.02%-0.70% of Mn, 0.020%-0.050% of S, 0.01%-1.2% of Ni, 12.5%-14.5% of Cr, 0.2%-0.9% of Mo, 0.001%-0.010% of Zr, 0.010%-0.020% of Mg, 5-15 ppm of Ce, 0.00032%-0.003% of Ca and the balance of Fe. And the balance of Fe and inevitable impurities. The product produced according to the chemical components and production process requirements of the steel disclosed by the invention has high strength and toughness, low hardness and high temperature resistance.

The invention provides a laser remelting process parameter optimization method and system based on a multi-objective optimization algorithm. The method comprises the steps that the range of laser remelting process parameters on the surface of a cladding layer is limited; designing a process parameter combination by using an ELHS method, carrying out a laser remelting experiment by using different process parameter combinations on the premise of keeping the surface quality of the cladding layer consistent, and collecting performance index data after remelting; establishing a nonlinear mapping model between the process parameters and the performance indexes by using a PSO-XGBoost model; a Pareto optimal solution set is obtained through population and individual initialization, non-dominated sorting, congestion degree calculation, optimal solution calculation and global optimization of process parameters by adopting an MOEDO algorithm based on a nonlinear mapping model; and a CRITIC-TOPSIS decision system is utilized to carry out evaluation sorting on the Pareto optimal solution set, and an optimal process parameter combination is screened out. According to the method, the influence of the laser power, the scanning speed and the lap joint rate on the quality and performance of the laser remelting surface can be considered at the same time, and the limitation of traditional single process parameter optimization is broken through.

The invention relates to the technical field of biomedical materials, in particular to a metal-loaded antibacterial agent and a preparation method thereof.The preparation method comprises the following steps that a metal precursor is loaded to the surface of a carrier, and then washing and drying are conducted; and carrying out mechanical ball milling on the dried sample by using a planetary ball mill, carrying out in-situ roasting in the mechanical ball milling process, cooling to room temperature, washing with water, and drying to obtain the metal-loaded antibacterial agent. According to the preparation method, the regulation and control on the interaction between the metal and the carrier can be realized by utilizing mechanical ball milling, the interaction between the metal and the carrier in the prepared antibacterial agent is stronger than that of a sample prepared by an impregnation method, and the regulation and control on the interaction between the metal and the carrier can be realized by changing parameters of a ball milling process; and meanwhile, by regulating and controlling the interaction strength of the'metal-carrier ', the controllable slow release of metal ions can be realized, the antibacterial effect is ensured, and the action duration of the medicine is prolonged.

The invention provides a fast-charging type solid-state lithium battery alloy negative electrode material, a preparation method and a solid-state lithium battery, and relates to the technical field of lithium batteries. The alloy negative electrode material comprises the following element components in percentage by mass: 30-38% of indium In, 30-35% of tin Sn, 28-35% of bismuth Bi and 0-1.5% of doping elements, crystal phases formed by the alloy negative electrode material of the fast-charging type solid-state lithium battery at least comprise two crystal phases, namely InSn4 and InBi. The alloy negative electrode material has relatively high surface capacity, lithium ion conductivity and lithium ion diffusion coefficient, lithium dendrites do not grow on a negative electrode when a solid-state lithium battery assembled by the alloy negative electrode material is charged and discharged under high current density, and the battery is high in energy density and long in cycle life.

The invention provides an aluminum ingot production process quality monitoring method and system, and belongs to the technical field of quality detection.The method comprises the steps that image acquisition is conducted on an aluminum ingot based on an image acquisition trigger signal, and aluminum ingot image data are obtained; performing defect identification on the aluminum ingot based on the aluminum ingot image data to obtain first defect information of the aluminum ingot; the first defect information comprises a defect proportion and a defect position of the aluminum ingot; in response to the condition that the aluminum ingot defect ratio is smaller than a first preset ratio, determining an ultrasonic scanning path based on the defect position; performing ultrasonic scanning on the aluminum ingot based on the ultrasonic scanning path to obtain aluminum ingot ultrasonic data; second defect information of the aluminum ingot is obtained based on the aluminum ingot ultrasonic data, and the quality grade of the aluminum ingot is determined based on the second defect information; the second defect information is the internal defect of the aluminum ingot. According to the aluminum ingot production process quality monitoring method and system provided by the invention, the aluminum ingot quality control and production efficiency can be improved.

The invention discloses a high-early-strength quick-hardening cement-based material for a low-temperature environment and a preparation method of the high-early-strength quick-hardening cement-based material. The cement-based material is prepared from the following components in parts by weight: 400 parts of sulphate aluminium cement, 100 parts of coal ash, 150 parts of water, 0.05-10 parts of lithium carbonate and 2 parts of a water reducing agent. According to the invention, high-purity lithium carbonate (gt; the early-stage hydration activity of the sulphoaluminate cement in a low-temperature (-5 DEG C) environment is remarkably improved, and good workability and compactness of slurry are ensured by combining an optimized mixing ratio and a polycarboxylic acid high-efficiency water reducing agent, so that a foundation is laid for early-stage strength development; the preparation method of the cement-based material provided by the invention is simple to operate, does not need complex pretreatment, and does not affect the construction period. Meanwhile, the industrial by-product fly ash is utilized, the resource utilization trend is met, energy is remarkably saved through the simplified maintenance process, and carbon emission is reduced.

The invention discloses a slurry electrolysis device and battery production equipment, and relates to the technical field of lithium batteries. As an electrolysis positive electrode and an electrolysis negative electrode are positioned between a slurry inlet and a slurry outlet and are in contact with battery slurry, the electrolysis positive electrode and the electrolysis negative electrode are in contact with the battery slurry; under the condition that the potential applied by a power supply for connecting the electrolysis positive electrode and the electrolysis negative electrode is greater than the oxidation potential of a to-be-electrolyzed metal element or alloy in the battery slurry, the to-be-electrolyzed metal element or alloy in the battery slurry can serve as a micro positive electrode, the surface of the to-be-electrolyzed metal element or alloy is oxidized due to potential difference and is gradually dissolved into ions, and the ions are gradually dissolved along with electrolysis. And large metal elementary substance particles are continuously oxidized, the volume is gradually reduced, and finally, the metal elementary substance particles are completely dissolved into metal ions without discharge risk, so that the removal of the metal elementary substance or alloy to be electrolyzed in the battery slurry is realized, and the self-discharge risk of the battery is reduced.

The invention relates to the technical field of coating preparation, in particular to a spraying process of a compact yttrium oxide coating, which comprises the steps of pretreatment, powder activation, matrix surface modification, meltallizing spraying, cooling curing, de-shielding treatment and post-cleaning. Yttrium oxide powder is activated through low-temperature plasma, sand blasting parameters and a high velocity oxy-fuel spraying process are optimized, the porosity of the coating is remarkably reduced to 1.5% or below, and the hardness is improved to 500 HV0.3. Internal stress is reduced in a sectional cooling mode, and balance of coating performance and economical efficiency is achieved in combination with a parameter optimization algorithm based on particle deposition dynamics. The preparation method can meet the requirement of the high-end semiconductor manufacturing field on a high-performance protective coating, and solves the problem of high porosity of a traditional process.

The invention discloses a grain boundary diffusion method of a sintered neodymium-iron-boron magnet. The grain boundary diffusion method comprises the following steps: providing a magnet to be diffused; coating the surface of the magnet to be diffused with coating slurry containing heavy rare earth metal powder, and performing grain boundary diffusion after vacuum heat preservation and dehydrogenation; the vacuum heat preservation dehydrogenation process comprises the steps that under the vacuum condition, the temperature is increased to 220-250 DEG C from the normal temperature after 1-1.5 h, heat preservation is conducted for 2-3 h, then the temperature is increased to 520-560 DEG C after 1-2 h, and heat preservation is conducted for 1-2 h; the grain boundary diffusion process comprises the following steps: heating to 650-750 DEG C after 1-1.5 hours, and preserving heat for 24-30 hours for permeation; and finally, the temperature is increased to 970-1000 DEG C after 1-1.5 h, and heat preservation is conducted for 2-3 h. According to the grain boundary diffusion method, the coercive force of the center part of the sintered neodymium-iron-boron magnet with the high permeation thickness can be remarkably improved, and the intrinsic coercive force gradient difference of the surface layer and the center part of the magnet is reduced.