679 results about "Metal particle" patented technology

The invention provides a method and system for detecting metal abrasive particle defects in lubricating oil, and the method comprises the following steps: scanning a lubricating oil sample collected by a machine by using a multispectral imaging system to obtain a two-channel image of a visible light wave band and a near-infrared wave band; the dual-channel image comprises a visible light image and a near-infrared image; respectively enhancing the visible light image and the near-infrared image, and carrying out fusion analysis on the enhanced images to obtain a dual-channel fusion image; performing window sliding on the dual-channel fusion image, and constructing a direction constraint factor; performing threshold segmentation on the dual-channel fusion image through a direction constraint factor to obtain an abrasive particle region; and an actual metal abrasive particle defect image is collected to analyze the abrasive particle area, and an identification result is obtained. By performing enhanced fusion identification on the visible light image and the near-infrared image and performing dual identification on the contour and the texture, the accuracy is improved, and the misjudgment rate is reduced.

The invention relates to the technical field of solar cells, in particular to copper-based paste, a TOPCon cell and a preparation method of the TOPCon cell. The copper-based slurry includes: copper powder as main powder densified in a sintering process to form a conductive phase; the hydrogen storage material is used for releasing a hydrogen element in the sintering process and locally forming a reducing atmosphere so as to prevent the copper powder from being oxidized; the hydrogen storage material comprises a liquid hydrogen storage material; and the organic carrier provides fluidity and thixotropy for the slurry. Compared with solid hydrogenated metal particles, the liquid hydrogen storage material can be more uniformly dispersed in the copper-based slurry and can coat the copper powder, so that the hydrogen element released from the copper-based slurry is more uniform, and the oxidation of the copper powder can be comprehensively inhibited. Meanwhile, the dehydrogenation amount of the liquid hydrogen storage material is far higher than that of the solid hydrogenated metal particles, the release amount of hydrogen elements can be increased by multiple times under the same mass, and then more sufficient oxidation protection is provided for the copper powder.

The invention provides a solar cell and a photovoltaic module, and relates to the field of photovoltaic technology. The solar cell includes: a silicon substrate including a first surface and a second surface opposite to each other in a thickness direction of the silicon substrate; the first doping layer and the first passivation layer are sequentially arranged on the first surface; the first seed layer penetrates through the first passivation layer and is electrically connected with the first doping layer, the first base metal layer covers the first seed layer, the first base metal layer is electrically connected with the first doping layer through the first seed layer, and the first seed layer is of a honeycomb structure comprising a plurality of first holes; the first base metal layer comprises a plurality of first metal particles; an interface between the first base metal layer and the first seed layer includes a plurality of interface regions, and in a first interface region of the plurality of interface regions, the first metal particles are filled in the first holes. According to the invention, the cost of the battery is reduced, the conductivity, the drawing force and the structural stability of the electrode structure are improved, and recombination is reduced.

The invention relates to the technical field of data processing, in particular to an AI large model multivariate data fusion method and system based on multiple modalities, and the method comprises the steps: collecting multi-source data; performing classification abnormity judgment; abnormal type identification; calculating severity; switching fusion modes; and outputting an alarm. According to the method, parameters such as the spindle temperature, the rotating speed fluctuation rate, the vibration acceleration, the current load, the acoustic emission energy spectrum peak value, the cutting force variance and the cooling liquid metal particle concentration are acquired and fused step by step in multiple dimensions in the machining process of the numerical control machine tool, so that the running state of the machine tool is dynamically sensed from multiple angles; furthermore, the physical essence of tool wear and material peeling is revealed through the coupling relationship between the cutting force variance and the metal particle concentration, and meanwhile, the dynamic stability change of the machine tool structure is captured by combining the spindle rotating speed fluctuation ratio; the problem that state monitoring is not accurate in the numerical control machining process due to data isolation and fusion strategy staticization is effectively solved.

The invention relates to a preparation method of a ceramic-based composite material, in particular to a preparation method of a ceramic-based composite material with a pyrolytic carbon-carbon nanotube interface, which is used for solving the problem that in the aspect of improving the thermal conductivity of an interface layer, metals such as Fe, Co, Ni and the like are widely used as catalysts for growing carbon nanotubes at present, so that the thermal conductivity of the interface layer is improved. Carbon nanotubes obtained through a traditional preparation method are prone to agglomeration and uneven in distribution, the risk of the preparation process is high, the carbon nanotubes are not suitable for large-scale production, although metal particles can be reduced through a chemical plating method, the particle sizes of the metal particles are not controlled, the distribution of the metal particles is uneven, and the requirement of a chemical vapor reduction method for distribution of an earlier-stage metal salt solution is high. And the defect is difficult to realize easily. According to the preparation method of the ceramic-based composite material with the pyrolytic carbon-carbon nanotube interface, the ceramic-based composite material with the pyrolytic carbon-carbon nanotube interface is finally obtained through pretreatment, solution A preparation, metal salt solution in-situ reduction and chemical vapor deposition in sequence.

The invention discloses a hydrogen energy fuel cell catalyst carrier based on a graphene graft polymer, which is characterized in that two-dimensional graphene is used as a substrate, the surface of the two-dimensional graphene is modified with an oxygen-containing functional group, and a functional polymer branch chain containing nitrogen, sulfur or phosphorus heteroatoms is covalently grafted to form a local three-dimensional network winding structure; the carrier is loaded with platinum, palladium, ruthenium and other metal or alloy nanoparticles, the particle size is 2-8 nm, the loading capacity is 10%-40%, and the particles are anchored to polymer functional sites or reduced in situ to a graphene defect area through coordination. A polymer branch chain has pH responsiveness and can adjust the local proton transmission efficiency; the grafting density is 3-15 grafting points per 100 carbon atoms, so that high dispersion and stable anchoring of metal particles are effectively realized; the specific surface area of the carrier is 400-800m < 2 > / g, the electrochemical active area is not less than 80m < 2 > / g, and the activity retention rate is greater than 80% after 5000 circles of accelerated durability tests. The activity, the stability and the proton conduction performance of the catalyst are remarkably improved, and the catalyst is suitable for high-performance fuel cells.

The invention discloses a granular catalyst and a preparation method thereof, and belongs to the technical field of chemical engineering. The preparation method of the granular catalyst comprises the following steps: S1, mixing raw materials containing a carbon material, an active metal material and a solvent to form slurry; s2, the slurry serves as a cathode in an electrode system and is subjected to pulse electrodeposition treatment, and active metal is deposited on the surface of a carbon material to form a particle catalyst; the electrode system is a two-electrode system; an anode in the two-electrode system comprises a dimensionally stable electrode, and an anode electrolyte is a sulfuric acid solution; and the two electrode systems are electrode systems in a flow battery stack structure. According to the preparation method, a flowing slurry and pulse electrodeposition combined method is adopted, so that metal particles are uniformly and stably loaded on a carbon material carrier, and gt is obtained within one-time preparation time of 1h; according to the method, laboratory-scale continuous synthesis of the granular catalyst is realized, and the method is simple in preparation process, mild in reaction condition and high in controllability.

The invention provides a Co (at) CeO2-x heterogeneous catalytic electrode as well as a preparation method and application thereof. The Co-coated CeO2-x heterogeneous catalytic electrode comprises foamed nickel and an electrocatalyst loaded on the surface of the foamed nickel, and the electrocatalyst comprises metal Co particles and CeO2-x with oxygen vacancy. The Co (at) CeO2-x heterogeneous catalytic electrode provided by the invention is prepared only through a process combining a room-temperature electrodeposition method and an air calcination method, has a three-dimensional self-supporting integrated structure, and also has a heterostructure and a porous nanosheet structure, so that more reaction active sites can be exposed, the interface charge transfer capability can be improved, and the catalytic performance can be improved. And the composite material has excellent activity and stability when being used as a cathode and an anode in the application of preparing formate and hydrogen by electrolyzing water under the assistance of glycerol.

The invention provides a method and a device for laser-induced plasma assisted preparation of a stripe structure. The method comprises the following steps: S1, building a laser processing system; s2, a metal target material is placed on a displacement workbench, and the transparent hard and brittle material is located above the metal target material; s3, a laser beam emitted by a laser passes through an objective lens and the transparent hard and brittle material and then is focused on the metal target material, metal plasma transferred to the back face of the transparent hard and brittle material is induced, metal particles are deposited on the back face of the transparent hard and brittle material through the metal plasma, and laser irradiates the metal particles to excite surface plasmons, the surface plasmon interferes with incident light, so that a periodic nano stripe structure is formed; s4, the laser beam is controlled to conduct machining on the surface of the transparent hard and brittle material according to the preset machining parameters and the scanning path; and S5, the transparent hard and brittle material processed in the step S4 is placed in an absolute ethyl alcohol solution to be subjected to ultrasonic cleaning and drying.

The invention discloses a coating for a chemical plating process and a preparation method of the coating, and belongs to the field of three-dimensional precision machining. The coating is arranged on the surface of a base material, and based on the mass percentage of the coating, the coating comprises 55%-85% of a cross-linked product of an epoxy resin AB agent, 1%-5% of nano metal particles and 10%-40% of water-soluble polymers. The coating is adopted for a chemical plating process, the process steps are few, and the binding force between a metal circuit and a base material in the prepared three-dimensional interconnection molding device is excellent.

The application belongs to the technical field of catalysts, and relates to a supported molybdenum carbide catalyst, which comprises a carrier and an active component; the carrier is MY molecular sieve, and the active component is molybdenum carbide; M is one or two of Co, Ni and Cu. A preparation method thereof is also disclosed, in which a molybdenum source solution is mixed with MY molecular sieve, dried, calcined, and then carbonized in a reducing mixed gas atmosphere to obtain the supported molybdenum carbide catalyst. The Y molecular sieve has good hydrothermal stability, a typical microporous structure, a large specific surface area, and can better disperse the active substance, so that more active components are exposed on the surface and participate in the reaction, and at the same time, smaller and more dispersed metal particles are obtained, which can effectively avoid the contact between the metal particles and the molybdenum carbide; on the other hand, the metal M is beneficial to H2 activation, improves the H2 dissociation capacity, and is helpful to remove the hydroxyl groups remaining on the surface of the molybdenum carbide during the reaction.

The invention discloses high-nickel stainless steel rolling equipment with a tension control function, and relates to the technical field of rolling equipment.The high-nickel stainless steel rolling equipment comprises a base, a first motor, a gearbox, a first connecting shaft, a second connecting shaft, a rolling device, a cleaning device and a deviation rectifying device.The rolling device can conduct fine adjustment on a roll gap of a rolling mill in time, and steel is kept to be stressed evenly; the cleaning device can adsorb and remove dust, impurities and fine metal particles attached to raw materials through static electricity before rolling is started, meanwhile, when equipment is shut down or the rolling procedure is intermittent, self-cleaning can be conducted, the cleaning efficiency in the next use process is guaranteed, and the deviation rectifying device can automatically rectify the dust, the impurities and the fine metal particles before the raw materials enter a rolling area through the conveying device. And the rotating angle and pressure of the conical roller can be automatically adjusted through the conical roller during transportation deviation, so that raw materials are gradually returned to a correct conveying path, and the defects of non-uniform rolling thickness, edge wave shape or plate shape caused by incorrect position are avoided.

The invention discloses a water curtain cooling type intelligent laser welding machine and method based on smoke poisoning prevention, and relates to the technical field of intelligent laser welding machines, the water curtain cooling type intelligent laser welding machine comprises a base, a welding mechanism is arranged in front of the base, and a Y-axis mechanism and an X-axis mechanism are arranged above the base and used for clamping and moving a machined part; a water curtain mechanism is arranged in front of the welding mechanism and used for generating a water curtain on the outer side of laser, smoke is prevented from being blocked, the water curtain mechanism comprises a circulating water curtain unit and a pressure unit, a closed water curtain is formed around a laser welding point through the circulating water curtain unit of the water curtain mechanism, and diffusion of high-temperature smoke can be effectively blocked. Purified water sprayed by the spray head forms a continuously flowing water curtain in the water collecting box, so that smoke dust can be cooled, the rising speed of the smoke dust can be reduced, part of metal particles can be settled in water, overflow of harmful smoke dust is greatly reduced, and the risk that an operator inhales the metal smoke dust is remarkably reduced.

The invention relates to the technical field of wind power generation, and particularly discloses a wind power generation gearbox lubricating system which comprises a gearbox body. A filtering mechanism is installed at the bottom end of the gearbox body, lubricating mechanisms are installed on the upper portions of the outer walls of the two sides of the gearbox body in a penetrating mode, and cooling mechanisms are installed on the outer walls of the two sides of the filtering mechanism. Through cooperative work of the filter box, the magnetic filter cartridge, the cleaning mechanism, the synchronous belt and other parts, the magnetic filter cartridge adsorbs ferromagnetic metal particles in lubricating oil through a magnetic field, damage of impurities generated by metal abrasion to gears and bearings is effectively reduced, and meanwhile, the service life of the gear and the bearings is prolonged. The electrostatic adsorption plate decomposes oxidation products and other non-ferromagnetic small particles in the lubricating oil, further purifies the lubricating oil, prolongs the service life of the oil liquid, and is matched with the self-cleaning mechanism to automatically remove impurities attached to the inner wall of the magnetic filter cartridge, so that the magnetic filter cartridge is prevented from being blocked, the replacement cost is reduced, and the reliability and economical efficiency of the whole lubricating system are improved.

The invention relates to a high-frequency electric resistance welding method for a transformer, and relates to the technical field of metal welding. A layer of self-reaction soldering paste is applied to the to-be-welded surface of the coil or the iron core to serve as a middle layer; and performing high-frequency resistance welding after mounting and positioning. The self-reaction soldering paste is the technical core of the invention and is composed of a powder mixture containing a solid chemical reducing agent and nano metal particles and an organic carrier. Under excitation of welding heat, the solid chemical reducing agent is subjected to an in-situ chemical reaction, and metal oxides on a welding interface are effectively removed; and meanwhile, the low-melting-point nano metal particles are rapidly melted, the purified clean interface is filled, and a compact metallurgical bonding layer is formed. Through the synergistic effect of chemical purification and physical filling, a defect-free welding joint is obtained, the welding joint has excellent mechanical strength and extremely low contact resistance, the process window is remarkably widened, and the reliability of the welding process is improved.

The invention discloses a GIS metal particle defect detection test platform and a detection method, and relates to the technical field of high-voltage electrical equipment detection and fault diagnosis, and the platform comprises a GIS equipment module which is used for simulating an actual GIS equipment operation environment and an internal metal particle defect scene; the alternating current voltage module is used for applying processing frequency voltage to the GIS equipment module; the impulse voltage module is used for superposing impulse voltage on the basis of power frequency voltage to realize electric stress coupling; the physical vibration module is used for applying controllable mechanical vibration to the GIS equipment module, simulating impact disturbance generated by switch operation, and enabling internal metal particles to be in a suspended or moving state; the protection device is used for ensuring the effective superposition of the power frequency voltage and the impulse voltage and blocking the reverse voltage; and the detection equipment is used for monitoring the motion trail, the charge characteristic and the partial discharge signal of the metal particles in the GIS equipment module in real time so as to carry out defect mechanism analysis. According to the invention, complex working conditions in GIS operation can be truly simulated.

The application discloses a kind of high-temperature-resistant impact-resistant heat-absorbing heat-insulating composite ceramic brick and its preparation method and application, the ceramic composite brick includes heat-insulating layer and heat-absorbing layer;The main component of the heat-insulating layer is vacuum nanometer heat-insulating ceramic particles and alloy metal particles containing one or more of tungsten, cobalt, molybdenum or vanadium elements;The main component of the heat-absorbing layer is 3N grade and above high-purity alumina and black pigment;The components of the heat-insulating layer and the heat-absorbing layer are filled in the same mold in sections, and then are pressed to form a composite.The heat-insulating layer not only has excellent heat-insulating performance, but also has good toughness and impact resistance;The heat-absorbing layer can quickly absorb heat and accumulate heat, the temperature rising speed in the furnace is increased by more than 30%, the set temperature is quickly reached, the heat-insulating performance is increased by more than 2 times, and has good practical value and important energy-saving and environmental protection social value.

The utility model relates to annealing furnace technical field, concretely relates to a seamless steel tube production is with annealing furnace, including annealing furnace main part, is provided with the discharge roller on the annealing furnace main part, is provided with the liquid collecting groove with the slope in the side of annealing furnace main part close to the discharge roller, the bottom of liquid collecting groove slope is provided with the filter plate, the top of filter plate is provided with the cleaning part for sweeping the impurity particle, through the coordination and cooperation of transmission mechanism, synchronous assembly and guide mechanism, make the cleaning part move along the filter plate, sweep the impurity particle accumulated on the filter plate surface, avoid the impurity particle to accumulate too much, prevent the filter plate from blocking, solved the technical problem that the metal particle or iron oxide that the clean water carried after spraying the steel pipe is easy to accumulate on the filter screen, leads to the filtration area reduction, makes the filter screen filtration efficiency decline, easily causes the annealing furnace overflow.

The application discloses a packaging structure with a selective copper-coated and chip-integrated unit and a preparation method thereof, and relates to the technical field of electronic packaging. The preparation method comprises the following steps: patterning a ceramic substrate, and attaching a first green body layer and a second green body layer to the surface of a first metallized layer of the patterning ceramic substrate and the surface of a heat dissipation plate, respectively; the first green body layer and the second green body layer are composed of solid-state diffusible metal particles, the conductive circuit area is stacked with a copper sheet through the first green body layer, the chip attaching area is stacked with a chip through the first green body layer, and bagging, sealing and sintering are performed. The four process steps of patterning a ceramic substrate, attaching a chip, copper-coating a conductive circuit and integrating a substrate and a heat dissipation plate are integrated into a one-time pressure sintering process, integrated packaging is realized, the packaging process is simplified, the production efficiency is improved, the thermal stress control is excellent, and the device performance and reliability are improved.

Materials for use in a 3D printer, including: several metal particles with an average cross-sectional length of less than or equal to 100 nm; and a stabilizing material comprising an organoamine, carboxylic acid, thiol and derivatives thereof, xanthogenic acid, polyethylene glycols, polyvinylpyridine, polyvinylpyrrolidone or a combination thereof; the metal particles and the stabilizing material agglomerate to form particles with an average cross-sectional length of about 1 µm to about 250 µm.

This invention belongs to the field of thermoelectric thin film technology, specifically relating to the preparation of a high-density domain-structured flexible silver telluride thin film and its reversible thermoelectric performance control method. The film possesses a high-density strip-like domain structure with numerous twins and stacking faults. The high-density domain boundaries provide a large number of ultra-highly active sites, allowing for wide-range reversible control of thermoelectric performance through simple post-processing methods, such as oxidation annealing, chemical and physical deposition of nano-metal particles. The high-density domain-structured silver telluride thin film prepared by this invention uses a silver film prepared by magnetron sputtering as a precursor, reacting it with tellurium vapor in a tube furnace to generate a dense thin film. The preparation method is simple, low-cost, highly reproducible, and operates at a low reaction temperature, making it suitable for large-scale preparation and compatible with flexible substrates such as polyimide. The high thermoelectric performance and reversible control characteristics of this film are of great significance for applications in high-performance flexible thermoelectric generators and multifunctional sensors.

The invention relates to the technical field of chemical reaction equipment, and discloses a reaction device and method for synthesizing free radicals from chloromethyl ethyl ether, the reaction device comprises a support, the inner wall of the support is rotatably connected with a shell, the top of the shell is connected with a first feeding port in a penetrating mode, and when a driving rod rotates, the driving rod drives a second gear ring and a first circular ring to rotate through a gear; due to the fact that the diameter of a first gear ring and the diameter of a second gear ring are different, the rotating speed difference exists between a first circular ring and a driving rod, metal particles enter the inner wall of the driving rod through a second feeding port, and the rotating speed difference exists between the driving rod and the first circular ring, it can be regarded that an auger rotates on the inner wall of the driving rod, and the rotating auger drives the metal particles to flow upwards; flowing metal particles flow out from the discharging port, so that the metal particles precipitated at the bottom of the reaction kettle can flow from bottom to top, and the situation that ethanol is differentiated from part of solution due to the fact that the metal particles at the bottom are heated too high is effectively prevented.

The utility model relates to the technical field of machining numerical control equipment, and discloses an arc discharge machine with a trigger type protection structure, which comprises a machine body, the side wall of the machine body is fixedly connected with a shell, the inner bottom surface of the shell is fixedly connected with a placing seat, and the inner bottom surface of the shell is provided with a protection assembly. According to the arc discharge machine with the trigger type protection structure, the transparent cover body shields the shell, splashing of high-temperature metal particles is avoided, a columnar workpiece is clamped by the two sets of arc-shaped plates, if the workpiece is in a plate shape, the workpiece is clamped by the two sets of clamping plates, an elastic telescopic rod pushes a transverse rod to move downwards, the transverse rod supports the plate-shaped workpiece, and if the workpiece is in a columnar shape, the elastic telescopic rod pushes the transverse rod to move downwards. The clamping stability degree of the columnar workpieces is reversely improved through the transverse rod through elastic deformation of the elastic telescopic rod, the flexible arc plate is attached to the outer surfaces of the columnar workpieces of different shapes, and the workpieces are prevented from sliding or shaking in the machining process.

The utility model provides magnetic separation equipment for recycling waste metal and surface wastes, and materials to be subjected to magnetic separation can be solid materials such as waste metal chippings and can also be slurry-shaped materials generated in the resource utilization process of pickling slurry; materials are fed into the magnetic separation main body through the spiral feeder, the magnetic plates are subjected to magnetic separation, the lifting rotating shaft is matched to drive the plate brush to lift and rotate to push away and flatly lay the materials on the magnetic plates, each layer of magnetic plate fully adsorbs metal particles, the plate brush pushes impurities and redundant materials into the lower layer of magnetic plate, and the impurities are finally discharged from the discharge port after layer-by-layer magnetic separation. And then the magnetism of the magnetic plate is eliminated, the metal particles fall off from the magnetic plate, the residual metal particles are swept to the discharging opening through the plate brush, and therefore collection of all the metal particles and cleaning of the interior of the magnetic separator are achieved.

The utility model discloses a kind of metal particulate matter control system, including buffer tank, buffer tank is connected with first bag filter, first bag filter is connected with several groups total filter components, total filter components have circulating filter piece, total filter components include finished product storage tank, finished product storage tank is connected with magnetic filter, magnetic filter is connected with first filter, first filter is connected with second filter, second filter is connected with packing machine;NMP in finished product storage tank is extracted by circulating pump and is sent into second bag filter, third filter, finished product storage tank, realizes the circulating filtration of NMP, can more stably filter NMP, there are less particulate matter in NMP, the multi-pass process grading filtration of NMP is realized by first bag filter, magnetic filter, first filter, second filter, avoid relying on some filter centralized to NMP, reduce the degree of jam, can improve the flow efficiency of NMP, filtering effect is good, and filtering efficiency is high.

The application discloses a high-nickel stainless steel rolling equipment with a tension control function, and relates to the technical field of rolling equipment, which comprises a base, a first motor, a gear box, a first joint shaft, a second joint shaft, a rolling device, a cleaning device and a deviation rectifying device. The rolling device can timely fine-tune the roll gap of a rolling mill, and keep the stress of steel uniform. The cleaning device can adsorb and remove dust, impurities and fine metal particles attached to raw materials by static electricity before rolling starts. Meanwhile, the cleaning device can perform self-cleaning when the equipment is shut down or during rolling process intervals, thereby ensuring the cleaning efficiency in the next use. The deviation rectifying device can automatically adjust the rotation angle and pressure of the conical roller when the raw material is transported to the rolling area through the conveying device, so that the raw material gradually returns to the correct conveying path, and the rolling thickness unevenness, edge wave shape or plate shape defects caused by incorrect position are avoided.

The invention relates to an insulator electric field homogenization and metal particle expelling collaborative optimization method based on an MLB neural network and an NSGA-II, which optimizes the structural parameters of a laminated dielectric functional gradient insulator by constructing a neural network agent model and combining with an NSGA-II multi-target genetic algorithm. Firstly, a neural network model is trained according to sample data, and rapid mapping of input design parameters, output electric field distribution and metal particle motion characteristics is achieved; and then, carrying out global optimization search on the basis of the proxy model, comprehensively considering the targets of the electric field homogenization index and the metal particle flooding efficiency to obtain a Pareto optimal solution set, and screening out a design scheme with the optimal comprehensive performance by using a TOPSIS method. Compared with a uniform insulator, the optimized insulator can realize obvious uniformization of electric field distribution on the concave side and the convex side, and has the capability of actively expelling metal particles, so that surface flashover and particle pollution risks are effectively reduced.

The invention belongs to the technical field of silicon-carbon negative electrode materials, and discloses a modified silicon-carbon negative electrode material based on a non-carbon-based porous skeleton and a preparation method and application thereof. The preparation method comprises the following steps: dipping and etching silicon powder to obtain porous silicon, dipping-reducing through a catalyst to obtain porous silicon loaded with metal particles, performing in-situ growth of carbon nanotubes through a CVD method, performing spray drying and activation with a carbon source to perform carbon coating, performing silicon deposition and carbon coating with silicon source gas and carbon source gas in sequence, and finally performing spray drying with a conductive agent to obtain the conductive carbon nanotube. The modified silicon-carbon negative electrode material is obtained. The reversible capacity and the conductivity are remarkably improved through in-situ growth of carbon nanotubes and silane coating, the cycle stability is enhanced through a non-carbon-based porous framework, the service life is prolonged, a uniform and stable SEI film can be formed on the silicon surface through silane deposition coating, side reactions are reduced, and the coulombic efficiency is improved; and the overgrowth of the SEI film can be limited, the consumption of lithium ions is reduced, and the first efficiency and reversible capacity are improved.

The application relates to the technical field of switch equipment, in particular to an arc-extinguishing chamber with a flow guide structure and a circuit breaker. The arc-extinguishing chamber with the flow guide structure comprises a contact seat, a static support and a flow guide cylinder, the contact seat is provided with an axial flow hole, the static support is a tubular structure with an open end, is sleeved on the contact seat through the open end, the flow guide cylinder is arranged in the static support along an axial direction, the flow guide cylinder and the static support surround an annular flow guide channel, a through hole is formed in the outer wall of the static support, a gas baffle is fixedly installed on the outer wall of the static support and corresponds to the through hole, and the gas baffle is provided with a gas discharge hole. The arc-extinguishing chamber with the flow guide structure can prolong the discharge path of the hot airflow and reduce the flow speed, can effectively prevent a large amount of foreign matters such as metal particles and dust carried in the hot airflow from being discharged, avoids threatening the ground or interphase insulation at the tail of the airflow channel, and improves the insulation reliability.

This application provides a circuit breaker, relating to the field of switch technology, which can increase the electrical clearance and creepage distance between the circuit board and other components, while reducing the possibility of metal particles or carbon dust generated during the circuit breaker's breaking process contacting the circuit board, thus preventing various physical and chemical corrosion phenomena and extending the service life of the circuit breaker. The circuit breaker includes a base, a middle cover, a protective cover, and a first circuit board. The base has a first open end and a first closed end disposed opposite to each other, forming a first receiving cavity with one end open. The middle cover is disposed at the first open end. The protective cover has a second open end and a second closed end disposed opposite to each other, forming a second receiving cavity with one end open. The protective cover is disposed within the first receiving cavity, and the second open end is connected to the first closed end. The first circuit board is disposed within the second receiving cavity.