33results about How to "Diffusion barrier" patented technology

The invention provides an aluminum alloy brazing composite material, an Al-Zn-based pre-buried brazing flux plate blank and a preparation method of the Al-Zn-based pre-buried brazing flux plate blank and relates to the technical field of aluminum alloys, and the aluminum alloy brazing composite material sequentially comprises a non-brazing filler metal layer and a brazing filler metal layer; the non-brazing filler metal layer sequentially comprises a core layer and an Al-Zn-based pre-embedded brazing flux layer, and the Al-Zn-based pre-embedded brazing flux layer is arranged close to the brazing filler metal layer; the Al-Zn-based pre-embedded brazing flux layer comprises an Al-Zn alloy and a fluorine-containing brazing flux; the Al-Zn series alloy comprises 1-12 wt% of Zn element according to the mass fraction, the Al-Zn based pre-buried brazing flux layer has dislocation, and the dislocation density of the Al-Zn based pre-buried brazing flux layer is 2.5-4.0 * 10 < 14 > / m < 2 >; and the core layer and the Al-Zn-based pre-embedded brazing flux layer cannot be melted during brazing. The problem that the yield strength after welding is insufficient due to the fact that the proportion of the core layer in the aluminum alloy brazing composite material is reduced can be solved.

The invention relates to the technical field of LEDs, in particular to a red light LED epitaxial wafer and a preparation method thereof. The red light LED epitaxial wafer sequentially comprises a GaAs substrate, a GaAs buffer layer, an anti-oxidation DBR reflecting layer, an N-type limiting layer, an N-surface micro-strain layer, an N-side space layer, a multi-quantum well active layer, a P-side space layer, a P-surface micro-strain layer, a P-type circulating doping limiting layer, a P-type transition layer and a P-type window layer from bottom to top. According to the invention, the conventional DBR reflecting layer material is adjusted into the antioxidant DBR reflecting layer, and the Al0. 5In0. 5P: C / Al0. 5In0. 5P: Mg periodic cycle doping structure and the like are introduced into the P-type limiting layer, so that the problems of luminous efficiency attenuation, brightness attenuation and the like of a conventional red light LED in a high-temperature and high-humidity environment or under the condition of large current can be effectively solved, and the obtained red light LED epitaxial wafer is good in luminous efficiency stability, high in reliability and wide in applicability.

The utility model discloses a multifunctional cigar portable box relates to tobacco appliance technical field. The portable box includes cigar box main part, explosion -proof lighter, cut -out spare, storage warehouse and heat -insulating layer. The cigar box main part is equipped with fireproof layer and support frame in, and fireproof layer adopts ceramic fiber composite material, and effective barrier flame diffusion, sets up dry powder storage warehouse and safety support spring below explosion -proof lighter, can release fire extinguishing agent automatically when deflagration, and the cut -out spare realizes linear cutting through replaceable blade and guide rail, and is equipped with spacing adjustment function, ensures accurate operation, and the storage warehouse is covered with aerogel heat -insulating layer, and maintains the constant temperature environment in the box. The utility model discloses through integration storage, ignition, cutting and safety protection function, solved traditional cigar box single -function, inconvenient to carry and the hidden danger of safety problem, has modularization design, double safety protection and easily maintains the upgrading and so on, is applicable to cigar lover daily use and outdoor scene.

The application provides a TOPCon cell and a preparation method thereof and a photovoltaic system, and relates to the field of solar cells. The TOPCon cell comprises a P-type silicon-based substrate and an N+ layer. The surface of the P-type silicon-based substrate extends in a direction away from the P-type silicon-based substrate and comprises, in sequence from the P-type silicon-based substrate, an N+ emitter layer, a silicon oxide layer, a first aluminum oxide layer, and a second aluminum oxide layer. The first aluminum oxide layer comprises a boron-doped aluminum oxide layer, and the second aluminum oxide layer comprises a phosphorus-doped aluminum oxide layer. The TOPCon cell adopts a double-layer gradient-doped aluminum oxide structure. The first aluminum oxide layer close to the P-type silicon-based substrate is a nanocrystalline aluminum oxide doped with boron, the B-O bond is used to enhance the interface chemical passivation, and the density of silicon dangling bonds is reduced. The second aluminum oxide layer close to the N+ emitter layer is an amorphous aluminum oxide doped with phosphorus. The phosphorus doping concentration gradient decreases, the electric field distribution can be controlled by P doping, and the hole recombination is inhibited.

The invention relates to the technical field of flame-retardant materials, in particular to a flame retardant, a preparation method thereof and a polyurethane material. The preparation method of the flame retardant provided by the invention comprises the following step: reacting benzimidazole, metal nitrate, aluminum hypophosphite, a surfactant and a solvent in a microwave reactor to obtain the flame retardant. According to the preparation method of the flame retardant, the synthesized metal organic framework material is used for coating the modified aluminum hypophosphite flame retardant, so that the compatibility with a matrix material is greatly improved, the problems of easiness in hydrophilicity, difficulty in dispersion, easiness in migration and the like during use are solved, and the flame-retardant effect and the processability are improved; the flame retardant can be independently used and does not need to be compounded with other flame retardants, and the flame retardant effect can still reach the V-0 level; when the flame retardant is used in a polyurethane material, the flame retardant property and the mechanical property of the material can be improved.

The utility model discloses a moisture-proof vibration-damping airport cable with unshielded control lines, which comprises an inner-layer cable core body formed by twisting seven power cable cores together, a cross-linked fluororubber longitudinal hole insulator, a copper net braided armor layer and a PUR outer sheath are sequentially wrapped outside the inner-layer cable core body, six longitudinal holes are uniformly distributed in the circumferential direction of the cross-linked fluororubber longitudinal hole insulator, and the outer sheath is wrapped outside the copper net braided armor layer and the PUR outer sheath. Each longitudinal hole is internally provided with three or four control wire cores and filled with polypropylene moisture absorption core materials, each power wire core comprises an inner conductor, an alignment type wholly aromatic copolyamide stretched fiber woven separation net, a nylon resin moisture-proof dielectric layer and a thermoplastic polyester insulating layer, and the outer diameter of the PUR outer sheath is 44-48 mm. The airport cable is balanced and stable in cable core structure, high in mechanical strength, better in vibration reduction performance, excellent in moisture-proof and water-blocking characteristics, suitable for laying and installation in a complex underground environment, and better in durability and applicability.

The utility model discloses a lithium battery production hot-pressing device which comprises a placing machine box and a pedestal arranged at the top end of the placing machine box, a hot-pressing seat A is arranged on the middle section of the top end of the pedestal, a hot-pressing seat B is arranged on the upper side of the hot-pressing seat A, and a stamping plate is arranged at the top end of the hot-pressing seat B; u-shaped protective covers are connected to the left end, the right end and the top of the rear end of the placing machine box, and a top seat is connected to the top ends of the U-shaped protective covers, a novel deflagration protective device is additionally arranged at the front end of the lithium battery production hot-pressing device, and the deflagration protective device can be adjusted in a lifting mode; when the lithium battery in hot-pressing processing is deflagrated due to short circuit and the like, only the deflagration protection device needs to be put down to separate a hot-pressing area from an external space to prevent flames generated by deflagration from diffusing outwards, and then the deflagration protection device can be opened only by opening a fire-fighting opening in the deflagration protection device to prevent the lithium battery from being deflagrated. And a fire extinguisher is inserted into the fire-fighting opening to spray a fire extinguishing agent to the deflagration part, so that a deflagration fire source can be quickly extinguished.

The utility model relates to the technical field of mobile toilets, in particular to a non-drainage type mobile toilet which comprises a toilet body and a defecation cavity formed in the front face of the toilet body, a toilet door is rotatably installed at the position of a cavity opening of the defecation cavity, a collecting cavity is formed in the back face of the toilet body, and the non-drainage type mobile toilet further comprises a collecting box detachably installed in the collecting cavity, the top of the squatting pan is designed to be open, the squatting pan is fixedly installed at the bottom of the defecation cavity, the top of the squatting pan penetrates through the bottom and is provided with a defecation cavity communicated with the collection cavity, automatic opening and closing are achieved, the squatting pan conforms to the defecation habit, and when a user naturally steps on the pedal, the sealing baffle is automatically opened; after defecation is finished, the feet leave the pedal, the baffle is automatically closed under the action of the spring, manual operation is not needed, human body behavior habits are met, when the baffle is closed, the defecation opening is completely covered, peculiar smell diffusion is effectively blocked, a pure mechanical gear and rack transmission structure is adopted, electric power or a sensor is not needed, the fault rate is reduced, and the device is suitable for the environment without power supply.

The utility model relates to a vacuum cavity and a vacuum coating machine. The vacuum cavity comprises a cavity structure and a plurality of extraction openings formed in the cavity structure. The extraction openings are distributed around a vertical tangent plane on the cavity structure; the extraction opening is connected to a vacuum pump, and the cavity structure is vacuumized through the vacuum pump; each extraction opening is used for vacuumizing at a set extraction rate under the control, and a negative pressure wind screen with a set air pressure range is generated on the plane of the vertical tangent plane; wherein the negative pressure wind screen prevents particles and gas molecules from diffusing in the cavity structure; according to the technical scheme, the cavity structure complexity is reduced, the equipment cost is reduced, and the coating quality is improved.

This invention relates to the field of polysiloxane thermal insulation materials, and discloses a thermal insulation decorative coating for building exterior walls and its preparation method, comprising the following preparation steps: sanding the building exterior wall substrate with sandpaper and blowing away surface dust with compressed air to obtain a pretreated building exterior wall substrate; spraying the thermal insulation decorative coating onto the surface of the pretreated building exterior wall substrate and curing it to obtain the thermal insulation decorative coating. The thermal insulation decorative coating is formed by mixing amino-functionalized polysiloxane emulsion, acrylic emulsion, defoamer, preservative, hydroxyethyl cellulose, dodecyl alcohol ester, ethylene glycol, composite hollow ceramic microspheres, and water. The thermal insulation decorative coating is then sprayed onto the building exterior wall substrate to form a thermal insulation decorative coating, which exhibits high thermal insulation performance. Furthermore, the composite hollow ceramic microspheres are uniformly distributed within the thermal insulation decorative coating, and are not easily broken under external force.

This invention relates to the field of plasma spraying, and more particularly to a method and apparatus for localized precision spraying in plasma spraying. The technical solution is as follows: For forming a coating on a target area of ​​a workpiece, it includes the following steps: Step 1: Enclosing and positioning. Based on the shape and size of the area to be sprayed on the workpiece, a surrounding ring with a matching inner diameter is selected. The surrounding ring is installed on a fixed ring, and the surrounding layer of the surrounding ring is tightly fitted to the workpiece surface so that the spraying space only covers the target area. This invention, through replaceable surrounding rings, can customize the enclosing of local areas of workpieces of different sizes and shapes, ensuring that the spraying operation only acts on the target area, avoiding waste of coating material and contamination of non-target areas of the substrate, achieving localized precision spraying. The heat-resistant ceramic surrounding layer and the ceramic ring form a thermal barrier during the spraying process.

The invention discloses a heat-conducting and hydrophobic modified phosphorus-nitrogen halogen-free flame retardant chitosan aerogel as well as a preparation method and application thereof, and belongs to the technical field of aerogel preparation. The invention provides a preparation method of heat-conducting, hydrophobic and flame-retardant chitosan aerogel, which comprises the following steps: by taking biomass chitosan as a matrix, carrying out hydrophobic modification through tetraethoxysilane and methyltrimethoxysilane, and introducing an autonomously synthesized phytic acid-dicyandiamide flame retardant and an MXene high-heat-conductivity filler to form a mixed solution; and freezing in a refrigerator and freeze-drying in vacuum to obtain the multifunctional aerogel with a three-dimensional porous structure. The aerogel has remarkable advantages in the aspects of reducing the dosage of the flame retardant and reducing the thermal conductivity, and has the characteristics of hydrophobicity, flame retardance, thermal conductivity and reproducibility.

This application relates to the technical field of Ru porcelain processing equipment, and discloses a Ru porcelain glazing device, including a glazing box. A ring-shaped air curtain machine is bolted to the side surface of the glazing box. An L-shaped back plate is welded to the back of the glazing box, and a lead screw is installed between the glazing box and the L-shaped back plate. A drive motor is installed at the end of the lead screw. A threaded sleeve is threaded onto the surface of the lead screw, and a glazing frame is welded to the side surface of the threaded sleeve. An air suction hood is welded to the front of the L-shaped back plate, and an air suction pipe is welded to the upper surface of the air suction hood. In this application, the ring-shaped air curtain machine forms an air curtain barrier at the opening of the glazing box, blocking the diffusion of harmful gases. The air suction pipe is connected to an external air purification device via an external flange, thereby using the external air purification device to extract and purify the air under the air suction hood. The combination of these two methods can reduce the concentration of harmful gases in the workshop and reduce the risk of respiratory exposure for workers.

The invention provides a silicon dioxide gel preparation method, a crucible and a preparation method of the crucible, and relates to the technical field of crucible preparation. The preparation method of the silicon oxide gel comprises the following steps: firstly, adding an organic silicon source and deionized water into an organic solvent to form a second matrix solution, adding a humectant and a cross-linking agent into the second matrix solution, and uniformly stirring to obtain the silicon oxide gel, the second matrix solution reacts with a humectant and a cross-linking agent to form an intermediate solution, the strength and the structural stability of silicon dioxide are improved, then an acid solution or an alkali solution is added into the intermediate solution and stirred uniformly, the reaction speed is controlled, a mixed solution with relatively small pore diameter is formed, the mixed solution is subjected to standing and aging, and the silicon dioxide is obtained. And enabling different compounds in the mixed solution to fully and uniformly react to obtain the silicon dioxide gel. The silicon dioxide gel is high in purity, high in strength, stable in structure and small in pore diameter, and can be easily combined with the inner wall surface of the crucible base body to form a compact silicon dioxide coating.

This invention provides a purging device and semiconductor deposition equipment, overcoming the shortcomings of uneven purging and inability to form a complete gas curtain in the transport channel of existing MOCVD equipment. The device sets the first and second purging channels at specific angles, so that the two airflows converge in the chamber in front of the valve plate and are located inside the chamber, thereby forming a fully enclosed protective gas curtain from top to bottom without dead angles. This effectively blocks the diffusion of reactive gases to the valve plate side, improves the dustproof and heat protection effect of the valve plate, and enhances the operational stability and safety of the equipment.

The invention discloses a micro-alloying rapid extrusion flame-retardant magnesium alloy and a preparation method thereof, and belongs to the technical field of metal materials. The microalloying fast extrusion flame-retardant magnesium alloy is prepared from the following components in percentage by mass: 1.0 to 1.8 percent of aluminum, 0.3 to 0.4 percent of calcium, 0.4 to 0.6 percent of manganese, 0 to 0.08 percent of nano particles, less than or equal to 0.02 percent of inevitable impurities and the balance of magnesium. Calcium is preferentially oxidized at high temperature to form a compact CaO layer to block oxygen, so that the ignition point of the alloy is obviously improved; a high-density nanophase is dynamically separated out from aluminum and manganese in the rapid extrusion process, the grain boundary is effectively pinned, grain coarsening is inhibited, and the stability of a microstructure below an oxidation film is enhanced; nanoparticles are combined with ultrasonic melt treatment to refine the structure, surface oxidation film microdefects are filled at the same time, and the self-repairing capacity and compactness are improved. According to the design, through microalloying design (the total element content is smaller than or equal to 2.8%), nanoparticle reinforcement and a rapid extrusion process are cooperated, collaborative optimization of low production cost, good flame retardant property and efficient extrusion capacity of the alloy is achieved, and the industrial prospect is wide.

The application discloses a composite material structure and a preparation method and application thereof, and relates to the technical field of automobiles.The composite material structure comprises a metal base plate and a fiber resin composite layer, the fiber resin composite layer is arranged on at least one side surface of the metal base plate, and the fiber resin composite layer comprises basalt fibers and a resin matrix.The application solves the technical problem that the existing automobile material is difficult to simultaneously consider mechanical bearing and fire resistance and heat insulation by combining the metal base plate and the basalt fiber composite layer.

The embodiment of the invention provides coal conveying belt conveyor dust removal equipment which comprises a supporting mechanism, a conveying mechanism and a dust removal mechanism, the dust removal mechanism comprises a baffle and a nozzle, the baffle is rotatably connected to the top of the supporting mechanism, and a rotating shaft of the baffle extends in the transmission direction of a conveying belt of the conveying mechanism; the baffle is arranged on the conveying belt, so that the free end of the baffle can rotate towards the conveying belt to ensure that the baffle can cover or wrap coal on the conveying belt, dust generated in the conveying process of the coal is blocked, and the dust is prevented from being diffused into surrounding air; water is sprayed to coal on the conveying belt through the nozzles, so that the water sprayed out of the nozzles is combined with dust generated by the coal, dust diffusion is further reduced, meanwhile, the water sprayed out of the nozzles can cool the coal on the conveying belt, spontaneous combustion caused by too high temperature due to mutual friction of the coal in the conveying process is prevented, and fire disasters are avoided. And the safety in the coal conveying process is improved.

The application discloses an erosion-resistant ceramic crucible containing magnesium oxide for smelting of aluminum-lithium alloy and a preparation method thereof, and belongs to the technical field of refractory materials. White corundum, cordierite, Cr2O3, BaF2, CaF2, ZrO2 and TiO2 are mixed to form premix; after the premix, mixed additives, water and grinding balls are mixed and ground, the mixed slurry is obtained through aging; the mixed slurry is poured into a gypsum mold to be dehydrated to obtain a green body, the green body is sequentially subjected to drying treatment and isostatic pressing treatment to obtain a pretreated green body; and the pretreated green body is sequentially subjected to vacuum sintering and plasma spraying to obtain the erosion-resistant ceramic crucible. The erosion-resistant ceramic crucible prepared by the application has good resistance to aluminum-lithium alloy erosion when smelting the aluminum-lithium alloy.

The invention discloses a method for depositing a silver layer on a copper alloy complex profile, which specifically comprises the following steps: step 1, mechanically polishing bronze alloy profiles respectively, and then putting the bronze alloy profiles into deionized water and absolute ethyl alcohol for ultrasonic cleaning; 2, the bronze alloy profile treated in the step 1 is subjected to organic oil removal; thirdly, the bronze alloy profile treated in the second step is subjected to acid pickling; and 4, electro-deposition is conducted on the bronze alloy profile subjected to acid pickling activation in the step 3, copper alloy with a deposited silver layer is obtained, and then aftertreatment, drying and storage are conducted. The silver layers are electrically deposited on the outer curved surface of the copper alloy rod and the inner curved surface of the copper alloy pipe, so that uniform and crack-free silver layer electro-deposition on the copper alloy is realized.

The utility model relates to the technical field of spraying, and particularly discloses a spraying protection device, which comprises a width-adjustable support frame, the bottom of the support frame is provided with universal wheels, the two sides of the support frame are provided with side protection plates, the back side of the support frame is provided with two back protection plates that are attached to the side walls and are in sliding cooperation, the upper side of the support frame is provided with two height-adjustable top plates, the two top plates are stacked and in sliding cooperation, the lower end of the top plate is connected with a vertical side support plate and a back support plate, the side support plate is in sliding cooperation with the side protection plate, and the back support plate is in sliding cooperation with the back protection plate; the utility model can be adapted to spraying workpieces of different sizes, has stronger versatility, is more flexible and convenient to use, significantly improves mobility, adjustment convenience and reusability, is especially suitable for construction scenes that need to frequently change work sites, is suitable for various spraying work scenes, and has remarkable practicality, economy and environmental protection.

The utility model relates to oil press technical field, concretely is a kind of oil press with bore temperature accurate control function, including press bore body, press ring and press screw, press ring is fixedly arranged in press bore body, rotatable press screw is arranged in press ring, further including heating device, temperature measuring element and PLC controller, heating device is detachably installed in the outside of press ring, heating device includes front heating device and rear heating device respectively arranged in the front and rear of press ring, temperature measuring element is respectively arranged in the middle and rear part of press bore body, heating device and temperature measuring element are electrically connected with PLC controller. The oil press with bore temperature accurate control function effectively solves the temperature distribution uneven, poor stability, installation maintenance complex and difficult to realize partition temperature control and other problems existing in the temperature control of traditional oil press, realizes the real-time monitoring and accurate regulation of press bore temperature, improves the pressing efficiency and oil quality, and simplifies the disassembly and repair process.

The utility model discloses an assembly combined type PCB lamp panel, which relates to the technical field of PCB lamp panels, and comprises a lamp panel main body, the lamp panel main body comprises a central connecting plate and a plurality of groups of connecting plug boards which are symmetrically arranged on two sides of the central connecting plate and are distributed in a linear array, an assembling inserting groove used for being connected with the connecting inserting plates in an inserted mode when the lamp panel bodies are assembled is formed between every two adjacent connecting inserting plates, a plurality of lamp beads are evenly installed on the central connecting plate and the connecting inserting plates, and the adjacent lamp panel bodies are connected and assembled through assembling connecting pieces in the direction without the connecting inserting plates. A comb-shaped wiring layer corresponding to the connecting plug board is arranged on the back face of the lamp panel body and comprises a plurality of conducting circuits arranged in parallel. According to the utility model, the lamp panel main body is inserted and matched with the assembling slots through the connecting insertion plates, so that transverse expansion is realized; the adjacent lamp panel bodies are fixed through the splicing connecting pieces, the connecting inserting blocks are inserted into the connecting inserting holes of the lamp panel bodies, the connecting belts are embedded into the belt connecting grooves, and stable connection is formed.

The application relates to the field of special glass ceramics and surface modification coating, and discloses a high-stability glass ceramic fluorescent sheet and a preparation method thereof. The fluorescent sheet comprises a glass ceramic substrate and a sunlight control film layer which is combined on the excitation light incident side of the glass ceramic substrate; the glass ceramic substrate is composed of SiO2, Al2O3, Eu2O3, Tb4O7 and the like, and precipitates mixed crystal phases of feldspar and willemite; the sunlight control film layer is composed of Ag, TiO2, SnO2 and SiO2 which are alternately stacked; during preparation, the raw materials are melted and annealed, then nucleation and crystallization are carried out, and then the sunlight control film layer is magnetron sputtering deposited and surface modified. In the application, the inorganic crystal lattice anchoring light emitting center is used to replace the organic dye, photo fading is eliminated, the detection baseline is maintained stable, stray light is intercepted by the integrated film layer, excitation light leakage is eliminated, and the signal-to-noise ratio is improved.

This invention relates to the field of food sauce technology, and more particularly to a wasabi and mushroom sauce and its preparation method. The wasabi and mushroom sauce is prepared from the following raw materials in parts by weight: 80-120 parts wasabi granules, 5-20 parts wasabi oil granules, 150-300 parts diced mushrooms, 30-60 parts edible oil, 10-30 parts sweetener, 8-12 parts edible salt, 4-10 parts thickener, and an appropriate amount of water. This invention combines wasabi granules with highly stable wasabi oil granules. The wasabi oil granules are obtained by solidifying a Pickering emulsion stabilized with sodium octenyl succinate starch / microcrystalline cellulose and hydrogenated palm oil, exhibiting excellent protection and sustained-release effects against isothiocyanates, etc. The added diced mushrooms enrich the chewy texture. The wasabi and mushroom sauce maintains a high ITC content after storage, with a long-lasting flavor and rich taste, combining the aroma of real wasabi, the umami of mushrooms, and a full-bodied chewy texture.

The utility model relates to new energy automobile charging technical field discloses a charging device. The charging device, including shell, charging circuit board and heat management composite structure, charging circuit board and heat management composite structure all set up in the shell, heat management composite structure includes the heat conduction layer, phase change heat storage layer, heat insulation layer and the temperature equalizing layer that set up in turn, heat conduction layer and charging circuit board heat coupling, temperature equalizing layer and shell heat coupling. The charging device provided by the utility model can effectively manage the heat of charging device under the condition of natural heat dissipation, reduce the temperature of shell, eliminate local hot spot, improve charging efficiency and system reliability.

The application discloses a solar cell, a seed layer structure and a preparation method thereof and a photovoltaic module, and belongs to the photovoltaic technical field. The solar cell comprises a bottom silver-rich area, an intermediate transition area and a surface copper-rich area; the silver content of the bottom silver-rich area is greater than or equal to 75at%; the porosity of the bottom silver-rich area is less than or equal to 10%; the intermediate transition area comprises a silver-copper eutectic phase; the copper content of the surface copper-rich area is greater than or equal to 45at%; and the porosity of the surface copper-rich area is 20% to 50%. The seed layer can greatly reduce the silver content compared with a conventional pure silver seed layer, and can significantly reduce the material cost under the premise of ensuring the electrical performance; in addition, the seed layer structure has the transition structure of the bottom silver-rich area, the intermediate transition area and the surface copper-rich area, and is more conducive to improving the interface bonding strength, reducing the contact resistance and improving the photoelectric effect of the solar cell compared with the pure silver seed layer.

This invention discloses a high-temperature, high-strength molybdenum alloy with an in-situ self-healing antioxidant film and its preparation method, relating to the field of high-temperature alloy thermal protection technology. The antioxidant molybdenum alloy comprises a molybdenum alloy substrate and an antioxidant coating on its surface. During high-temperature oxidation, a layer composed of MoO3, Ta2O5, and RE is formed on the surface of the molybdenum alloy substrate. m TaO n The resulting dense oxide layer protects the substrate; the antioxidant coating has at least a two-layer structure, containing RE. m TaO n The phases (Mo,Ta)Si2 and (Mo,Ta)5Si3 have at least RE in their outer layers. m TaO n The molybdenum alloy contains a (Mo,Ta)Si2 phase and at least an (Mo,Ta)5Si3 phase in the inner layer. The preparation method involves mixing Mo, Ta, and rare earth elements in a specific ratio, pressing and sintering to obtain a molybdenum alloy ingot, and then subjecting the ingot to silicon infiltration with a silicon-infiltrating agent. This invention combines matrix alloying and surface modification to produce a molybdenum alloy with excellent high-temperature oxidation resistance, meeting the requirements for high-temperature applications up to 2000℃.

The utility model provides a natural gas pipeline heat tracing heat preservation device, including protection shell and pipeline main part, the protection shell is wrapped in the outside of pipeline main part. The utility model solves the problem that current electric heat tracing energy consumption is high, temperature can't be automatically regulated, and steam heat tracing system is complex, temperature is difficult accurate control. Through winding graphene heating film outside pipeline main part, and installing temperature sensor between both, temperature sensor can real -time monitoring pipeline main part surface temperature, after collocation suitable controller, can automatically regulate graphene heating film's heating power according to monitoring temperature - when environment temperature is too low, pipeline temperature is lower than setting, controller drives heating film to promote power to make up heat, when environment temperature rises, pipeline temperature reaches setting, controller reduces heating film power or closes, avoids condensate accumulation, frozen risk caused by too low temperature, prevents energy waste caused by too high temperature, realizes the dual effect of accurate temperature control and energy saving.

This invention relates to an antioxidant solder material and a welding process for surface-mount LEDs, belonging to the field of LED welding technology. It achieves homogenization of composition through a combination of step-by-step melting and microstructure control. First, a tin-copper-bismuth master alloy is prepared by pre-melting in a pit furnace, pre-dispersing the bismuth element. Then, vacuum induction melting combined with electromagnetic stirring, along with an intermediate alloy feeding method, promotes the uniform dispersion of high-melting-point / active elements such as nickel and rare earth elements. Ni and rare earth elements can play a role in grain refinement and grain boundary purification, effectively suppressing the gravitational segregation and coarsening of the bismuth phase, avoiding the formation of brittle enrichment zones in the solder joints. The resulting solder joints have uniform grains, a moderate thickness of the intermetallic compound layer, and a smooth morphology, significantly improving the shear strength and thermal fatigue resistance of the solder joints and reducing the risk of brittle fracture failure of micro-solder joints.