1390 results about "Metal particle" patented technology

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 invention provides a metal particle loaded self-supporting electrode material and a preparation method and application thereof, and belongs to the technical field of battery electrodes, the preparation method comprises the following steps: S1, cutting beech into pieces with the thickness of 5-7mm along the vertical growth direction, and calcining to obtain carbonized wood pieces; s2, metal salt is dissolved in the functionalized aqueous solution, the concentration of the metal salt is 0.03-0.05 M, and a soaking solution is obtained; the functionalized aqueous solution comprises dodecyl trimethyl ammonium chloride, sodium pyrophosphate, polyvinylpyrrolidone and water; s3, taking the carbonized wood chip as a working electrode, immersing the carbonized wood chip into the soaking solution, carrying out electro-deposition on a metal precursor, and then cleaning and drying to obtain a metal-loaded wood chip; and S4, pyrolyzing the metal-loaded wood chip in a hydrogen-argon mixed atmosphere, then cooling to room temperature, cleaning and drying to obtain the metal-loaded wood chip. According to the invention, the transition metal particles and the carbonized wood chips are better compounded, and more reliable active sites are provided for bromine electrochemical reaction, so that the overall performance of the zinc-bromine battery is improved.

This water electrolysis electrode comprises a substrate and a catalyst portion. The catalyst portion includes Raney nickel particles and metal particles that contain nickel as a main component. The metal particles are in contact with the Raney nickel particles and include aluminum. The ratio of the total number of moles of aluminum to the total number of moles of nickel in the Raney nickel particles is greater than the ratio of the total number of moles of aluminum to the total number of moles of nickel in the metal particles.

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 relates to an embedded energetic material space debris protection structure combined with an impedance mismatch effect, which is used for protecting space debris with the particle size of less than 1cm and comprises a high-impedance metal plate and energetic material blocks, and the energetic material blocks are uniformly embedded in the high-impedance metal plate at intervals. The energetic material is composed of an inert material and reactive metal particles. The protection characteristic of the high-impedance metal material is brought into full play, the impact initiation characteristic of the energetic material is introduced, and the impedance mismatch effect is generated by using the impedance difference between the high-impedance metal material and the energetic material, so that the protection effect of the protection structure is improved. The advantages of an energetic material and a high-impedance metal material are combined, and the comprehensive performance of the protection plate is remarkably improved through composite use of the two materials.

The utility model relates to a metal powder injection machine which comprises a supporting frame, an injection mechanism and a feeding hopper, the injection mechanism is arranged on the supporting frame, the feeding hopper is communicated with the injection mechanism, the metal powder injection machine further comprises a stirring rod and a driving rod, a feeding port is formed in the top of the feeding hopper, and the stirring rod is connected with the feeding port. The stirring rod is arranged on the top face of the feeding hopper and rotationally connected with the feeding hopper, a plurality of stirring blades are evenly distributed on the outer wall of the position, located in the feeding hopper, of the stirring rod, and the driving rod and the stirring rod are arranged in a linkage mode. The utility model provides the metal powder injection machine which can stir and loosen metal particles in the feed hopper when the metal particles are blocked.

The invention provides a PtRu-based composite bifunctional catalyst and a preparation method and application thereof, the PtRu-based composite bifunctional catalyst comprises a carrier and a load loaded on the carrier, and the carrier comprises a graphitized carbon carrier; the load comprises platinum ruthenium-based metal particles and a compound with a chemical formula of HxMO3, wherein M comprises W or / and Mo. According to the PtRu-based composite bifunctional catalyst disclosed by the invention, the metal PtRu plays a role in resisting CO poisoning, and the HxMO3 plays a role of a proton acceptor, so that a hydrogen oxidation reaction is promoted. Meanwhile, the HxMO3 can strengthen a difunctional mechanism of a carbon monoxide oxidation reaction, and the CO poisoning resistance of the catalyst is improved. In addition, the graphitized carbon carrier with a specific graphite microcrystal size has good high-potential corrosion resistance and metal dispersibility, and metal agglomeration and performance degradation of the catalyst caused by high-potential corrosion of the carrier are greatly slowed down.

The invention discloses a liquid metal-hydrogel composite radiation protection material and a preparation method and application thereof.The preparation method comprises the steps that indium, tin and bismuth are sequentially put into a flask from low melting point to high melting point to be mixed, and glycerin is added for immersion; placing the mixture in an argon atmosphere, and stirring by using a heating type magnetic stirrer; taking out the spherical liquid metal particles from the glycerol, and finally washing and drying to obtain liquid metal alloy particles; preparing a PVA (polyvinyl alcohol)-H2O solution with the mass fraction of 15% and a PVA-DMSO (dimethyl sulfoxide) solution with the mass fraction of 15%; and a PVA-H2O solution, a PVA-DMSO solution and the liquid metal alloy particles are stirred and mixed according to the mass ratio, the mixed solution is subjected to ultrasonic treatment and then poured into a mold to be frozen into gel, and the liquid metal-hydrogel composite material is obtained. By combining the advantages of the liquid metal and the hydrogel, excellent biocompatibility, adjustable mechanical property and efficient radiation shielding capability are realized, and the hydrogel can be used as a novel lead-free radiation protection material.

The invention provides a PtCo-based composite catalyst and a preparation method and application thereof.The PtCo-based composite catalyst comprises a carrier and a load, the carrier comprises mesoporous carbon, the load comprises platinum-cobalt-based metal particles and a compound with the chemical formula being HxMO3, and M comprises W or / and Mo; a contact interface exists between the platinum-cobalt-based metal particles and the compound with the chemical formula of HxMO3; the platinum-cobalt-based metal particles comprise a first part of the platinum-cobalt-based metal particles, and the first part of the platinum-cobalt-based metal particles are supported in the mesoporous structure of the mesoporous carbon. According to the PtCo-based composite catalyst, a contact interface exists between HxMO3 and PtCo-based metal particles, the catalytic activity of platinum and cobalt can be improved, and reduction of oxygen on the surface of the catalyst is facilitated; part of platinum-cobalt-based metal particles are supported in a mesoporous structure of mesoporous carbon, so that the stability of the catalyst can be improved.

An object of the present invention is to provide a chemical solution that, in the case of being used in a step of bringing a contact-target member and the chemical solution into contact with each other, is less likely to cause a predetermined defect in the contact-target member. A chemical solution according to the present invention includes an organic solvent and a metal-containing particle including a metal element selected from the group consisting of Fe, Ni, and Zn, wherein an I value determined by a method X is 0.010 to 10.000,method X: the chemical solution is applied onto a substrate to prepare a subject; a surface of the subject is analyzed by being scanned with laser using laser-ablation-inductively coupled plasma-mass spectrometry, to obtain charts for the metal elements in which an abscissa axis indicates laser scanning time and an ordinate axis indicates ion detection intensity; the ion detection intensity of the charts is accumulated for the scanning time to determine accumulated ion detection intensities of the metal elements; the accumulated ion detection intensities of the metal elements are added up to determine a total accumulated ion detection intensity; and the total accumulated ion detection intensity is divided by a laser scanning area to obtain an I value in units of counts / mm2.

The invention provides a diaphragm-free electrochemical sewage treatment method and device, and belongs to the technical field of sewage treatment. A sewage stock solution, an oxidizing agent and a catalyst are mixed, the mixed solution flows parallel to an anode and perpendicular to a cathode at the same time, a dynamic and stable anode acid zone, a dynamic and stable cathode alkaline zone and a dynamic and stable metal ion metastable zone are presented in a reactor by regulating and controlling a flow field and an electric field, and the mixed solution flows through an anode compression acid diffusion layer in parallel to promote the anode reaction efficiency; the alkaline diffusion layer vertically penetrating through the porous cathode efficiently reduces high-valence metal ions into low-valence metal ions, metal oxides and nano metal particles; hydroxyl free radicals and high-valence metal complexes are generated through a Fenton or Fenton-like catalytic reaction to degrade and mineralize refractory organic pollutants in the sewage stock solution, a large amount of acid and alkali does not need to be added before and after the reaction to adjust the pH value of the sewage stock solution, and the yield of active species is high; and cyclic utilization of the catalyst can be realized through intermittent backwashing of the porous cathode.

The invention relates to the technical field of steel strip trimming, and discloses a steel strip trimming device for stainless steel strip cold rolling, which comprises a workbench and an adaptive base plate. When a steel belt with the conventional thickness is treated, the two guide rollers work cooperatively, waste materials and the steel belt are guided stably, the waste materials are conveyed out through the limiting rollers, the steel belt enters the follow-up process smoothly, and efficient and stable conventional production is ensured; when a thick steel belt is cut, an overturning motor is started to enable the two guide rollers to rotate, the first guide roller jacks the steel belt to move upwards to an inclined friction plate on the side wall of the cutting piece, burrs are fully polished, and the pressing rollers are synchronously limited to guarantee uniform polishing; the second guide roller presses the waste downwards and forms opposite acting force with the first guide roller to generate shearing force, cutting resistance is reduced in cooperation with the cutting blade, the cutting efficiency is improved, the polished steel belt and the waste are guided by the second guide roller to enter a workbench water tank to be cleaned, chippings, impurities and metal particles are effectively removed, and it is guaranteed that the steel belt is clean. The influence of waste residues on subsequent treatment is avoided.

An adaptive flow regulation system for a tilting melting hearth atomization system includes: a load cell sensor configured to capture a weight of a molten metal within a tilting melting hearth during a pouring operation; a process camera configured to capture visual characteristics of the molten metal during the pouring operation; a particle size analyzer configured to analyze a metal powder following an atomization process to determine a particle size distribution of the metal particles; an actuator coupled to a linkage configured to support and move the tilting melting hearth to a desired hearth tilt angle; and a central processing unit (CPU) having a machine learning program configured to receive data from the load cell sensor, the process camera, and the particle size analyzer and to send a control signal to the actuator for controlling a pour rate from a melting cavity of the tilting melting hearth.

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 a powder detection method, system and device, a storage medium and a program product. The method comprises the following steps: determining a reference moving speed of a material carrying mechanism according to a signal coverage range of an electromagnetic wave generator and a preset moving time length of powder to be detected in the signal coverage range, and controlling the material carrying mechanism for carrying the powder to be detected to move according to the reference moving speed, controlling the electromagnetic wave generator to emit an electromagnetic wave signal to the to-be-detected powder at the position where the to-be-detected powder reaches the electromagnetic wave generator on the material carrying mechanism, and acquiring an infrared signal generated by the to-be-detected powder and received by the infrared detector at the position where the to-be-detected powder reaches the infrared detector on the material carrying mechanism; the detection result of the metal particles in the powder to be detected is determined according to the infrared signal; the electromagnetic wave signal is used for heating metal particles in the to-be-detected powder; according to the method, the detection sensitivity is improved, and the risks of missing detection and error detection are correspondingly reduced.

The invention provides a nanofluid fuel with metal carbide as an additive and a preparation method thereof.The nanofluid fuel comprises liquid fuel, the metal carbide and a surfactant, the metal carbide and the surfactant are evenly dispersed in the liquid fuel, the mass percent of the metal carbide is 1%-40%, the mass percent of the surfactant is 1%-20%, and the mass percent of the liquid fuel is 1%-20%. The mass percent of the surfactant is 1%-15%, and the balance is liquid fuel. By applying the technical scheme, the technical problems that in the prior art, the energy density of liquid fuel is insufficient, and the combustion heat release process of fuel is affected by surface oxidation and combustion products of traditional energy-containing nano metal particles or metal oxide particles are solved.

The present invention discloses a large-format multifunctional laser cutting machine, including a cleaning and flipping mechanism, the cleaning and flipping mechanism including a stable bottom plate, a laser cutting mechanism installed on the top of the cleaning and flipping mechanism, the top of the stable bottom plate is fixedly connected to a U-shaped table frame through a bracket, and a linkage groove is provided on the rear side of the top of the U-shaped table frame. The present invention relates to the technical field of laser cutting machines. The large-format multifunctional laser cutting machine uses the cleaning and flipping mechanism and the laser cutting mechanism in combination. The arrangement of these two mechanisms enables the brush plate to clean the bottom of the cutting table and remove the solidified metal particles when the electric telescopic rod pushes the laser cutting head to descend for cutting, and when the guide rail frame moves forward, the linkage between the mechanisms can be used to unload the plate, and the cutting table can be flipped to make the clean side face up, thereby ensuring the cutting quality without affecting the cutting production, and meeting the current use.

The invention discloses a spiral grinding and cleaning structure for the inner wall of a grinding machine and a pipe interior and exterior grinding machine. In the grinding process, particles in a pipe are cleaned through cleaning brushes, and grinding particles are driven to slide towards the outer side of the pipe through spiral arrangement of grinding brushes; and metal particles in a pipe are adsorbed through an electromagnet, so that the secondary cleaning difficulty is reduced. The device is characterized in that the device is composed of a polishing assembly and an adsorption assembly, the polishing assembly is composed of a polishing head, a dustproof hole, a cleaning brush and a polishing strip, the polishing strip is fixedly arranged on the side face of the polishing head, a containing groove is formed in the side face of the polishing head, and the cleaning brush is clamped on the containing groove; the adsorption assembly is composed of an adsorption shell, a positioning frame, anti-skid rubber, a damping spring, a containing groove, a fixed power source, a limiting block, a positioning ring, a wire, a coil, a connecting hole, a containing hole, a heat insulation layer, a damping shell, a locking ring, heat dissipation holes and a locking groove.

The preparation method comprises the steps that a metal precursor mixed solution containing a nucleating agent, a complexing agent, ammonium salt, non-noble metal salt and a solvent is placed in an exogenous magnetic field, a reducing agent is added for a reduction reaction, and the high-entropy alloy nanowire is obtained; the nucleating agent comprises a platinum source and a palladium source; the non-noble metal salt comprises a combination of at least three of ferric salt, cobalt salt, nickel salt, copper salt or manganese salt. A platinum source, a palladium source and non-noble metal salt are used as reaction raw materials of the high-entropy alloy nanowire, a magnetic field is added, and in the reduction process, the nucleation and growth process of magnetic metal particles and the self-assembly behavior of magnetic nanocrystals are regulated and controlled through magnetic force, so that the high-entropy alloy nanowire is obtained. The high-entropy alloy nanowire which is adjustable in length-diameter ratio, stable in structure and uniform in Pt dispersion can be prepared under the conditions of room temperature and normal pressure, and the composite catalyst obtained after the high-entropy alloy nanowire is mixed with commercial carbon powder is rich in active sites and excellent in oxygen reduction catalytic activity.

A separation method for impurity metal particles in a cathode powder. The separation method comprises: providing a first separation liquid and a second separation liquid, wherein the density of the second separation liquid is greater than that of the first separation liquid, and the density of the second separation liquid is less than that of impurity metal particles in the cathode powder; mixing the cathode powder with some of the first separation liquid to form a suspension; adding the second separation liquid to a container, and adding the other part of the first separation liquid to the container to create layering; and adding the suspension into the container having the layered solution, such that the impurity metal particles sink to the bottom of the second separation liquid, thereby achieving separation. Further provided is a detection method for impurity metal particles in a cathode powder.

The invention discloses an insulating part, an end cover assembly, an energy storage device and electric equipment. The insulating part comprises a first surface and a second surface, and the first surface and the second surface are oppositely arranged in the thickness direction of the insulating part. The insulating part is provided with a diversion trench, an opening of the diversion trench is located in the first surface, and a diversion hole is formed in the bottom wall of the diversion trench and penetrates through the bottom wall of the diversion trench. The surface roughness of the groove bottom wall of the flow guide groove is larger than that of the first surface. The insulating part provided by the invention can prevent the metal particles from entering the battery cell through the insulating part to cause short circuit of the energy storage device, and the safety performance of the energy storage device can be improved.

The invention discloses a handheld laser welding machine capable of preventing metal from splashing, and relates to the technical field of laser welding, the handheld laser welding machine comprises a nozzle fixed on a gun nozzle of a laser welding gun, a flow guide head used for shunting shielding gas is fixed in the nozzle, a plurality of flow changing plates are annularly distributed on the periphery of the nozzle, and the nozzle is sleeved with a flow adjusting assembly; the flow adjusting assembly comprises a flow guide cover arranged on the nozzle in a sleeving mode, and the flow guide cover moves in the axial direction of the nozzle. The protective gas is shunted through the flow guide head, and the shunted protective gas is blown to the lower end of the nozzle through the flow adjusting gas channel formed between the nozzle and the flow guide cover, so that the problems that splashing high-temperature metal particles make continuous contact with the outer wall of the nozzle, and the high-temperature metal particles and oxygen in an area not covered by the protective gas are subjected to composite reaction are solved; and a corrosive metal oxide deposition layer is formed, so that the outer wall material of the nozzle is subjected to oxidation peeling and thermal stress crack propagation, and the service life of the nozzle is shortened.

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.

A self-adaptive high-precision line repairing method comprises the following steps that S1, a detected sample is irradiated through a light source, and a CCD high-resolution camera collects image data to detect defects existing in a line; s2, analyzing the collected defect image data through an image analysis device to obtain a repair path of the nozzle, and calculating an operation parameter of the self-adaptively changed nozzle by using an empirical formula; s3, ablating the target electrode through an electric spark ablating device to prepare nano metal particles; s4, the flow rate of inert gas is adjusted through a carrier gas flow rate control device, and the nano-metal particles are conveyed into a nano-particle printing and sintering device; s5, printing the metal nanoparticles to the line defect position through a dry aerosol printing nozzle, and realizing the complete repair of the line through the movement of the nozzle and the assistance of a movable platform below the substrate; and S6, a pressurizing pump and a heating assembly are started to pressurize and heat the metal nanoparticles on the substrate in the sintering cavity. According to the scheme, the processing efficiency of line repair is improved.

The invention relates to the technical field of medical nickel-titanium materials, in particular to a trace multi-element doped medical nickel-titanium alloy tube and a preparation method thereof.The trace multi-element doped medical nickel-titanium alloy tube comprises a nickel-titanium alloy tube body, and the nickel-titanium alloy tube body comprises 54.5 wt%-57.0 wt% of Ni, 42.8 wt%-45.3 wt% of Ti, an element for improving biocompatibility and fatigue resistance, a reinforcing and toughening element, an antioxidant element and an antibacterial element; the preparation method comprises the following steps: pretreating metal particles, accurately weighing, uniformly mixing, smelting and annealing to obtain a nickel-titanium tube blank; performing linear cutting to form an inner hole; the nickel-titanium tube blank is processed to the outer diameter of 4-6 mm through hot rolling and first-stage intermediate annealing, and then the nickel-titanium tube blank is processed to the outer diameter of 0.17-0.32 mm through cold drawing and second-stage intermediate annealing; and performing heat treatment and surface treatment. The obtained product has good mechanical properties and biocompatibility, the preparation method provided by the invention can control the microstructure of the product, and the product performance difference is small.

The invention relates to an observation device and method for simulating GIS equipment switch action metal particle motion, the device comprises a GIS simulation cavity, a vibration applying mechanism and a particle observation mechanism, the vibration applying mechanism applies mechanical vibration to the GIS simulation cavity; the particle observation mechanism collects the motion trail of the metal particles in real time. According to the device, the vibration of a shell is actually measured by means of a vibration detection mechanism when GIS equipment is switched on and off, mechanical vibration and transient overvoltage conditions generated by the GIS equipment switching on and off operation are equivalently simulated by means of a vibration applying mechanism and a voltage applying mechanism, and the movement conditions of sunken metal particles are recorded in the whole process by means of a particle observation mechanism. Furthermore, the influence of the GIS equipment vibration parameters on metal particle escape is quantitatively analyzed, the influence mechanism of the GIS equipment switch operation on the sinking particle escape phenomenon is obtained, and an important research basis and data support are provided for an optimization scheme for suppressing sinking particle movement under the GIS equipment switch operation.

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.

To provide a joined body manufacturing method capable of sufficiently suppressing falling-off of a member in manufacturing of a joined body using metallic paste, the metallic paste usable for such a method, and a method for producing the same.SOLUTION: This joined body manufacturing method comprises: a first step of applying metallic paste containing metal particles and a liquid dispersant, which is liquid at 25°C, onto a first member to form a film of the metallic paste; a second step of removing a part of the liquid dispersant from the film to form a metal particle-containing layer; a third step of disposing a second member on the metal particle-containing layer to provide a laminate; and a fourth step of sintering the metal particle-containing layer of the laminate. In the second step, droplets are generated on the surface of the metal particle-containing layer.SELECTED DRAWING: None