34results about How to "Improve launch performance" patented technology

The invention provides a preparation method of a beryllium-copper alloy material with high beryllium content, which comprises the following steps of: preparing metal raw materials containing pure copper and beryllium-copper master alloy, smelting to obtain alloy liquid, casting the alloy liquid to obtain a cast ingot, homogenizing the cast ingot to obtain a homogenized casting blank, and hot-rolling the homogenized casting blank to obtain a hot-rolled blank, the preparation method comprises the following steps: carrying out hot rolling on an alloy strip, carrying out hot rolling on the alloy strip to obtain a hot-rolled blank, carrying out annealing treatment on the hot-rolled blank to obtain an annealed blank, carrying out a circulating cold rolling-intermediate annealing process on the annealed blank, and finally carrying out finish rolling and finished product annealing treatment on the alloy strip to prepare the high-beryllium-content beryllium-copper alloy material. And machining passes are many.

The invention discloses electronic equipment, and relates to the technical field of communication. The electronic equipment comprises an antenna structure arranged on a frame of the electronic equipment, wherein the antenna structure comprises a first antenna branch knot; a second antenna stub; a third antenna stub; the second end of the first antenna branch knot is opposite to the first end of the second antenna branch knot to form a first breaking joint; the second end of the second antenna branch knot is opposite to the first end of the third antenna branch knot to form a second breaking joint; the first end of the first antenna branch is grounded, and the second end of the third antenna branch is grounded. Wherein a first position on the first antenna branch is grounded through series connection of the first tuning matching and the feed source, a first end of the second antenna branch is grounded after being connected with the first device, and a first end of the third antenna branch is grounded after being connected with the second device; or, the second end of the first antenna branch is connected with a second tuning matching circuit to be grounded, and the second end of the second antenna branch is grounded by connecting a third device and a feed source in series.

The invention discloses high-frequency electrotome anti-adhesion gold and a preparation method thereof. The alloy comprises the following components in percentage by mass: 9.3-10.2% of Ni; 0.05 to 0.3 part of rare earth oxide; and the balance of Ag and inevitable impurities. The rare earth oxide comprises at least two of cerium oxide, yttrium oxide and lanthanum oxide. According to the high-frequency electrotome, due to the fact that the prepared alloy is doped with the rare earth oxide which is low in electron work function and high in melting point, the hot electron emission capacity of the high-frequency electrotome can be improved, the working temperature can be reduced, and the adhesion of tissues at the working tip can be effectively reduced. The silver-nickel alloy containing the rare earth oxide has the excellent mechanical property, the polishing property of the working tip of the high-frequency electrotome can be improved, the highly-polished needle tip can effectively reduce adhesion of tissue scorching substances in the cutting process, the adhered scorching substances can be wiped off more easily through clean gauze, and the operation is smoother and rapider.

Compared with the prior art, the pretreatment process for improving the wettability of the fluid on the surface of the metal tungsten filament has the advantages that an oxide layer on the surface of the tungsten filament is removed through washing liquid cleaning, vacuum preheating and the like, meanwhile, the tungsten filament is prevented from being oxidized again in a nitrogen environment, and cooling parameters are adjusted; the coverage rate and the coverage uniformity of the surface fluid are improved, the surface wettability of the metal tungsten is effectively improved, the liquid metal adhesion capacity in a long-time working state is improved, the stable working performance of an electrode emission system is improved, and the purpose of the invention is achieved.

The invention discloses a micro electro mechanical system (MEMS) ultrasonic transducer, which comprises a transmitting unit, a receiving unit, a transmitting unit and a receiving unit, the decoupling space is positioned between the transmitting unit and the receiving unit; wherein the surface, opposite to the receiving unit, of the transmitting unit is a curved surface. According to the invention, the surface, opposite to the receiving unit, of the transmitting unit is set to be the curved surface, so that the transmitting performance is improved on the premise that the receiving performance is not reduced.

The present application belongs to the technical field of electromagnetic detection, and relates to a composite impedance matching network of a controllable source electromagnetic exploration system and a design method. The composite impedance matching network comprises a topology structure of a CIMN composed of a fixed capacitor CF and an ICLC part in series, and is integrated in a transmitting system of the controllable source electromagnetic exploration system. The CIMN adopts a new combined matching method and related optimization design, improves the wideband current transmission performance in terms of compensation range and power loss, proposes a new combined matching topology structure, and illustrates the corresponding wideband matching function through mathematical derivation and analysis. In combination with the wideband transmission requirement of the controllable source electromagnetic method and the limited power supply condition, a parameter optimization scheme and a control strategy of the composite impedance matching network are designed. The CIMN can better adapt to the wide working frequency range of the CSEM transmitter, improve the matching bandwidth, and reduce the power loss.

The utility model relates to the technical field of main boards, and discloses an ultra-miniature Bluetooth earphone main board, anti-electromagnetic interference is realized by arranging structures such as a Bluetooth module, a winding inductor, a main board and the like, the Bluetooth module receives a Bluetooth signal, so that the main board is connected with a mobile terminal, electromagnetic interference is caused to a signal module in a signal transmission process, and the main board cannot be damaged. By arranging the winding inductor on the adjacent side of the Bluetooth module, electromagnetic drying on the signal module during signal connection is absorbed or weakened, the receiving and transmitting effects of the antenna are enhanced, the anti-electromagnetic interference effect is achieved, wireless charging is achieved by arranging the Hall element, the wireless disc and other structures, and when an external wireless charger makes contact with the earphone box, the wireless charging effect is improved. When the wireless charger is charged, alternating current with a certain frequency is generated by the charging coil, certain current is generated in the secondary coil through electromagnetic induction, so that energy is transferred from the wireless charger to the charging coil, the charging coil transmits the current to the Hall element through the connecting wire, and the wireless charging effect is achieved.

The invention relates to the technical field of rocket launching platform design and application, in particular to a modular application method of a reconfigurable rocket launching platform, and solves the technical problem that existing launching work generally needs to carry out new launching platform design and demonstration according to rocket requirements. According to the method, a main control unit, a supporting unit, a filling unit and a testing unit framework of a launching platform are formed according to different rocket launching requirements; a plurality of units with different functions are stored in the launching site according to the number of stations, the requirements of rocket launching on a launching platform can be received, and the units with the functions are dispatched according to the actual requirements of a rocket under the dispatching of the main control unit; the unit for supporting the final assembly goes to a final assembly workshop to support rocket final assembly work; under the condition that part of the units do not need to participate in final assembly work, the parts of the units can directly go to a transmitting station for standby preparation; after the rocket is subjected to final assembly, the rocket is transported to a launching station through the units participating in final assembly work in a cooperative mode, and after launching is completed, all the units are withdrawn.

The utility model relates to the field of geophysical exploration, in particular to an electromagnetic emission system for borehole electromagnetic method exploration, which comprises a power supply arranged on the ground; the conductive frame is transversely telescopic; the conductor rod is longitudinally accommodated in the conductive frame, and the top end of the conductor rod is connected to the power supply through a power supply line; and, the conductive frame is configured to: in response to rotation of the conductor bar, extend laterally to self-fix in the well; the lower end of the steel wire rope is connected with the conductive frame, and the top end is wound on a twisted rope support located on the ground. According to the electromagnetic emission system, the problem that a traditional underground electromagnetic emission electrode has no quality guarantee is solved, the working efficiency is improved, the underground electromagnetic emission success rate is improved, the underground drilling condition is fully utilized, quantitative detection is carried out, and a reliable prospecting equipment hardware foundation is provided for a new round of prospecting action in China.

This application relates to the field of antenna technology, disclosing an antenna and a communication device. The antenna includes a main board, a radiating structure, a parasitic structure, and a feeding structure. The radiating structure is disposed on the main board and includes high-frequency stubs and low-frequency stubs. The parasitic structure is disposed on the main board and includes high-frequency parasitic stubs and low-frequency parasitic stubs. The high-frequency parasitic stubs are electromagnetically coupled to each other, and the low-frequency parasitic stubs are also electromagnetically coupled to each other. The feeding structure is connected to both the high-frequency and low-frequency stubs, providing electrical signals to them. Through this method, this application enables a single antenna to support communication needs from 2G to 5G and multiple Wi-Fi frequency bands.

The application provides a preparation method of a high-beryllium-content beryllium copper alloy material, which comprises the following steps: melting metal raw materials containing pure copper and a beryllium copper master alloy to obtain an alloy liquid, casting the alloy liquid to obtain an ingot, uniformly treating the ingot to obtain a homogenized casting blank, hot-rolling the homogenized casting blank to obtain a hot-rolled blank, annealing the hot-rolled blank to obtain an annealed blank, performing a cyclic "cold rolling-intermediate annealing" process on the annealed blank, and finally performing finish rolling and product annealing on the alloy strip to prepare the high-beryllium-content beryllium copper alloy material. The method can solve the problems of the second phase component of the high-beryllium-content strip being inconsistent, the strip being cracked, side-bent and wrinkled, and a large number of processing passes in the prior art.

The invention relates to a flame-retardant radiation refrigeration film with excellent durability and a preparation method thereof, the radiation refrigeration film is a layered film with a micro-nano porous structure formed by mutual crosslinking of flame-retardant and weather-resistant resin fibers, and inorganic micro-nano particles are uniformly coated in the flame-retardant and weather-resistant resin fibers. The flame-retardant radiation refrigeration film with excellent durability provided by the invention has excellent radiation refrigeration performance and thermal stability, on one hand, strong molecular vibration in a 8-13-micron wave band region can be provided, the emission capability of an atmospheric window wave band is enhanced, and on the other hand, the inorganic micro-nano particles have efficient sunlight scattering capability, so that the radiation refrigeration film has excellent radiation refrigeration performance and thermal stability. And the emissivity of an atmospheric window wave band can be improved, and the refrigeration performance of the fiber membrane is further enhanced. On the other hand, high stability, including flame retardance, ultraviolet resistance and chemical corrosion resistance, of the fiber skeleton is provided, and the fiber skeleton can be used for a long time in a severe environment and has a good market application prospect.

The invention aims to provide an efficient heat dissipation router for network communication, and relates to the technical field of communication equipment, the efficient heat dissipation router comprises a base assembly, the base assembly comprises a balancing weight and an anti-skid pad, and the balancing weight is used for keeping the router stable; the shell assembly comprises a shell, a cover plate, a dustproof plate, a mounting rod, a connecting rod, a sleeve rod and a first antenna assembly and is used for air flow entering and signal transmitting. The mainboard assembly comprises a circuit board and a supporting spring, damping protection is carried out through the supporting spring and the second antenna assembly, and the problem that a traditional router is poor in heat dissipation effect is solved.

The invention discloses a plasma torch point cathode structure and a preparation method thereof. The point cathode structure comprises a cathode copper substrate and a cathode silver substrate. A through hole is provided in the cathode copper substrate. A cooling cavity is provided at the bottom of the through hole. The cathode silver substrate passes through the through hole, and its bottom end is located in the cooling cavity. At least one small hole is provided at the top center of the cathode silver substrate, and particles are welded in the small hole. The preparation method comprises the following steps: 1) preparing a cathode copper substrate and a cathode silver substrate; 2) installing the cathode silver substrate in the through hole of the cathode copper substrate; 3) preparing a point cathode rough blank; 4) vertically placing the point cathode rough blank in a vacuum atmosphere furnace, vacuuming and heating with a vacuum pump, and then cooling to room temperature to obtain a plasma torch point cathode structure. The point cathode structure of the invention has good electrical conductivity, and the preparation method thereof has a simple process, low processing cost, is suitable for industrial production, reduces the burning speed of the point cathode, and prolongs the life of the point cathode.

The invention discloses a method for preparing a diffusion cathode based on corner stacking of refractory metal nets, and belongs to the field of diffusion cathodes. The multiple layers of tungsten mesh wafers are loaded into a mold in an angle-rotating stacking mode, two-way pressing forming is carried out, and a cathode green body is obtained; then sintering in a pure hydrogen atmosphere of a high-temperature tungsten mesh hydrogen furnace; and sintering and salt leaching are carried out in a pure hydrogen atmosphere, and finally the cathode is obtained. According to the cathode prepared by the method, different porosities and pore structures can be set or adjusted according to needs, so that the diffusion cathode is large in impregnation amount and good in emission performance.

The invention relates to a power rollback method and device, communication equipment and a computer readable storage medium, and relates to the technical field of communication. The power rollback method comprises the following steps: acquiring antenna impedance and equipment state information of at least one first transmitting antenna in the communication equipment; determining a use scene of the communication equipment according to the antenna impedance and the equipment state information; determining a power back-off strategy corresponding to each transmitting antenna of a target antenna group in the communication equipment according to the use scene; wherein the target antenna group comprises at least one first transmitting antenna and at least one second transmitting antenna, and the first transmitting antenna and the second transmitting antenna are located at different positions of the communication equipment; and controlling the transmitting power of the target antenna group according to the power rollback strategy. The application can subdivide the usage scenarios to perform power backoff, solves the problem of communication quality reduction caused by excessive power backoff, and improves the communication performance.

The application relates to the technical field of semiconductor photoelectric devices and thin film manufacturing, and particularly discloses a preparation method of a light detector based on a sputtering hybrid semiconductor thin film. The prepared light detector comprises, from bottom to top, a transparent conductive substrate, a bottom charge transport layer, a hybrid semiconductor light absorption layer, a top charge transport layer and a metal electrode. The hybrid semiconductor light absorption layer is prepared by using a magnetron sputtering process based on target self-heating. The thermal electron emission effect of the target self-heating is used to excite high-density plasma at a low working voltage, to rapidly and lowly damage the target for sputtering, and to form a dense and pure-phase hybrid semiconductor thin film. The application uses a multi-dimensional method of adjusting the cathode surface magnetic flux, adjusting the working voltage and target self-heating to improve the plasma density in the chamber. While realizing high-speed deposition of 30-500 nm / min, the hybrid semiconductor thin film defect density is reduced and the photoelectric performance of the light absorption layer is improved.

The invention discloses manganese ion doped enhanced up-conversion red light emitting scandium aluminate and a synthesis method thereof, and belongs to the technical field of up-conversion luminescent materials. The molecular formula of the up-conversion luminescent material provided by the invention is Ba (2-x) MnxSc (0.67) Yb (0.3) Er (0.03) AlO5 (x = 0-0.5), and the preparation method is a high-temperature solid phase method. The radius of manganese ions is much smaller than that of barium ions, so that the manganese ions easily enter a main substrate Ba2ScAlO5 and influence a crystal field, and oxygen vacancies are generated in the material. Defects formed by the oxygen vacancies can increase the energy transfer efficiency of the material, so that the sensitization and emission capabilities of rare earth ions are improved, and the luminescence characteristic of the material is improved. The obtained Ba1. 6Mn0. 4Sc0. 67Yb0. 3Er0. 03AlO5 has the maximum red light emission intensity at the red light wavelength of 664nm under the excitation of 980nm near infrared laser, and compared with the red light emission intensity of Ba2Sc0. 67Yb0. 3Er0. 03AlO5 obtained in a contrast, the red light emission intensity of the Ba1. 6Mn0. 4Sc0. 67Yb0. 3Er0. 03AlO5 is improved by nearly 27.4 times. The manganese ion doped scandium barium aluminate up-conversion luminescent material prepared by the invention has excellent single red up-conversion luminescence, and meanwhile, the preparation method is simple, good in controllability, high in yield and more energy-saving and environment-friendly in preparation process, and is suitable for industrial popularization.

The present invention relates to a visible-near-infrared frequency-dividing radiation cooling film based on a bionic rose petal micro-nano structure and a preparation method and application thereof, belonging to the field of radiation cooling technology. In order to solve the problem that existing radiation cooling materials cannot take into account both lighting and cooling performance, the present invention provides a visible-near-infrared frequency-dividing radiation cooling film based on a bionic rose petal micro-nano structure, comprising a transparent bionic micro-nano structure layer and a multilayer film structure layer of a bionic rose petal structure arranged from top to bottom, the surface of the transparent bionic micro-nano structure layer is distributed with a first cone micro-nano structure in an array; the surface of the first cone micro-nano structure is distributed with a second cone micro-nano structure in an array. The present invention realizes the selective transmission of solar radiation energy by the radiation cooling film, realizes the visible-near-infrared band frequency-dividing function and the high emission performance of the atmospheric window, can take into account both lighting and cooling performance, thereby broadening the scope of application of the radiation cooling material.

The utility model relates to the technical field of toy guns, in particular to a counter weight speed-reducing emission gun which is provided with a gun body, a gear clamping piece, a gear and a speed-reducing counter weight mechanism are respectively arranged on the gun body, the gear is rotatably connected with the gun body, the gear clamping piece is arranged on the gun body on one side of the gear, a clamping part and a releasing part are respectively arranged on the gear clamping piece, and the speed-reducing counter weight mechanism is arranged on the gun body. The gear clamping piece is connected with the gun body through a reset spring, the speed reduction balance weight mechanism is installed on the gun body on the other side of the gear and comprises a balance weight block, a gear supporting block and a pull rod, the gear supporting block is rotationally connected with the gun body, and the gear supporting block is rotationally connected with the gear clamping piece. The gear supporting block is provided with a tooth supporting part and a pulling part, the tooth supporting part extends to the space between teeth of the gear, the pulling part is connected with the balancing weight through a pull rod, the balancing weight is connected with the gun body in a limiting and swinging mode, and the gun has the advantages of being simple in structure, capable of reducing speed during continuous shooting, good in shooting sense, good in shooting effect and the like.

The invention discloses an infrared emission chip structure and a preparation method thereof.The infrared emission chip structure comprises a semiconductor board, a keyboard matrix module, a code modulation module, a first infrared LED emission module, an intensity control assembly, a heat dissipation assembly and a heating assembly, and the intensity control assembly is arranged at the top of the semiconductor board; the heat dissipation assembly and the heating assembly are arranged at the top of the semiconductor plate; the intensity control assembly comprises an infrared intensity control module arranged at the top of the semiconductor plate, one side of the semiconductor plate is provided with an illumination sensing module, one side of the semiconductor plate is provided with a distance sensing module, and one side of the semiconductor plate is provided with a second infrared LED emission module. According to the invention, the intensity of the infrared light signal can be adjusted by the infrared emission chip structure according to the actual situation through the arranged intensity control assembly, so that the situation that the infrared emission chip structure wastes electric power is prevented, and the emission effect of the infrared emission chip structure on the infrared light signal is improved.

The invention relates to an antenna control method, an antenna control device, electronic equipment and a storage medium. The antenna control method comprises the following steps: determining a target antenna arranged on equipment; determining a target working parameter of the target antenna according to the transmit-receive performance influence parameter of the target antenna; and controlling the target antenna according to the target working parameter so as to improve the transceiving performance of the equipment. Thus, the transmitting performance and the receiving performance of the target antenna can be improved simultaneously, the transmitting and receiving performance of the device is improved, normal communication of the device is ensured, and the user experience is improved.

The invention relates to a CNTs modified anti-sticking silver-nickel alloy, which comprises the following components in percentage by mass: 4.0-5.5% of Ni; 0.03-0.2 part of a rare earth element and an oxide thereof; 0.1 to 0.5 part of CNTs (carbon nanotubes); and the balance being Ag. Compared with a common silver-nickel alloy, the alloy disclosed by the invention is added with the CNTs, the rare earth elements and the oxides of the rare earth elements with specific contents, so that on one hand, the alloy has high mechanical property and the service life is prolonged, and on the other hand, the anti-arc characteristic of the CNTs and a structure different from carbon deposition are utilized; and therefore, tissue adhesion, carbon deposition and the like in contact with the alloy are reduced. Besides, due to the existence of the rare earth and the CNTs, the interface of the silver-nickel alloy is not coherent, and tissue adhesion and carbon deposition are also not coherent, so that the alloy is easier to wipe and clean while the tissue adhesion and the carbon deposition are reduced.

The invention relates to a 4G terminal connecting plate, and belongs to the technical field of communication, and the 4G terminal connecting plate comprises a plate body; the 4G module is integrated on the board body; the power supply module is integrated on the board body, is in communication connection with the 4G module and is used for supplying power to the 4G module; the startup module is integrated on the board body, is in communication connection with the 4G module and is used for starting up the 4G module; the SIM card module is integrated on the board body, is in communication connection with the 4G module and is used for sending and receiving data; and the serial port communication module is integrated on the board body, is in communication connection with the 4G module, and can communicate with an external single-chip microcomputer. The 4G module is adopted to replace Bluetooth transmission, so that the data transmission distance is increased, and the real-time performance, accuracy, safety and universality of data transmission are improved.

The centralized shooting mechanism comprises a centralized loading plate, a plurality of rocket mounting positions are arranged on one side of the centralized loading plate, a mounting hole is formed in the bottom of each rocket mounting position, rockets are clamped in the mounting holes, holes are formed in the bottoms of the rockets, piston firing pins are arranged in the holes, and the piston firing pins correspond to the mounting holes. A sealed cabin is arranged on the side, symmetrical to the rocket mounting position, of the concentrated bullet loading plate, an impact hole is formed in the side, away from the concentrated bullet loading plate, of the sealed cabin, a boosting agent cartridge bag mounting position is arranged on the side wall, in the sealed cabin, of the concentrated bullet loading plate, a boosting agent cartridge bag is arranged in the boosting agent cartridge bag mounting position, and an ignition table is further arranged in the sealed cabin. A built-in space is formed by the ignition table and the ignition copper cap, an ignition agent is arranged in the built-in space, when an external firing pin impacts the ignition copper cap to ignite the ignition agent, the ignition agent ignites the boosting agent cartridge bag, the boosting agent cartridge bag rapidly combusts to generate gas, after the gas pressure reaches the gas pressure, a piston firing pin of the rocket is pushed, the piston firing pin impacts the bottom of a rocket hole, and the rocket is launched through the gas pressure.

The invention discloses a high-entropy coated hot cathode with a close-packed hexagonal structure and a preparation method of the high-entropy coated hot cathode. The preparation method comprises the following steps: (1) mixing tungsten powder, rhenium powder, osmium powder, tantalum powder and molybdenum powder, then carrying out ball milling, and then carrying out sintering molding; (2) melting a product in the step (1) by adopting an electric arc melting technology, and cooling and solidifying to prepare a target material; and (3) coating the surface of a cathode material with the target material prepared in the step (2), and then performing annealing treatment to obtain the single-phase high-entropy alloy coated hot cathode material. The surface of a traditional diffusion cathode is covered with a high-entropy alloy film layer, the film layer is diffused into a base body through heat treatment to be further alloyed with tungsten or tungsten alloy, and the high-entropy film-coated cathode with the surface of a close-packed hexagonal structure is formed. The advantages of low diffusion coefficient, distortion of surface crystal lattices and the like of the high-entropy alloy film layer are effectively utilized, the function of reducing the work function of the surface of the cathode is realized, and the emission capability of the cathode is further improved.

The utility model relates to the technical field of rocket frame safety assisting, in particular to a safety assisting device for fixing a rocket frame in artificial influence on weather, which comprises a rocket launching platform and a supporting seat, a launching adjusting seat is fixedly connected to the top of the supporting seat, and a launching frame is rotatably connected to the top of the launching adjusting seat. A plurality of connecting lugs are fixedly connected to the edge of the bottom face of the supporting base, and supporting legs are connected to the centers of one sides of the connecting lugs in a threaded mode. The utility model has the advantages that after the bottom is supported by the plurality of supporting legs, preliminary fixation is realized, then the plurality of supporting legs and the plurality of hanging rings are connected through the plurality of telescopic tensioning assemblies, and the supporting legs and the hanging rings are tensioned and fixed through the tightening of the telescopic tensioning assemblies; in this way, the supporting seat is tensioned and fixed from the periphery in a centripetal mode from multiple directions, recoil force during launching can be more effectively resisted, the displacement amount after launching is greatly reduced, and safety and the launching effect are improved.

The application relates to a preparation method of a dual-ligand protected electrochemiluminescence gold nanocluster and application of the electrochemiluminescence gold nanocluster in detection of hOGG1. The electrochemiluminescence gold nanocluster is synthesized in a one-step method with methionine and beta-cyclodextrin as dual ligands. The obtained water-soluble electrochemiluminescence gold nanocluster has good biocompatibility, high electrochemiluminescence efficiency and complete nanomaterial performance. When the specific electrochemiluminescence gold nanocluster is used as an ECL luminophore, and an hOGG1 ECL sensor with triethylamine (TEA) as a co-reactant is applied to detection of human 8-oxoguanine DNA glycosylase (hOGG1), the sensor has higher sensitivity and shows good sensing potential. The sensor is simple to operate, has good repeatability, and has important scientific significance and application value for early clinical diagnosis.

The invention relates to the technical field of refractory metal cathode materials, in particular to a barium-tungsten cathode material and a preparation method thereof. The preparation method of the barium-tungsten cathode material comprises the following steps: (1) preparing roughened tungsten powder; (2) preparing doped zirconium oxide powder; (3) mixing raw materials, pressing and forming; (4) sintering a green body; according to the barium-tungsten cathode material disclosed by the invention, the cathode material has relatively high internal porosity while having excellent hardness, so that excellent emission performance is ensured, the problem that the mechanical performance and the porosity of the traditional barium-tungsten cathode material cannot be maintained at excellent levels at the same time is solved, and the barium-tungsten cathode material has a good application prospect in the aspect of the cathode material for a vacuum electronic device. Wide application prospects are realized.

According to the components of the spraying type white thermal control coating suitable for the magnesium-lithium alloy and the preparation method of the spraying type white thermal control coating, the method is directly implemented on the surface of a magnesium-lithium alloy base material of a spacecraft in a spraying mode, low-absorption and high-emission performance is achieved, and the spraying type white thermal control coating is made to be within the expected temperature range. The invention aims to solve the problem that the existing white thermal control coating is not suitable for the magnesium-lithium alloy. The thermal control coating comprises an adhesive, a filler, a curing agent, a catalyst and a solvent, the solar absorptivity of the thermal control coating is 0.13-0.19, the hemispherical emissivity is 0.87-0.91, the adhesive force is 0-1 level, and the thermal control coating has good thermal control performance. The method is suitable for aluminum alloy, magnesium alloy, magnesium-lithium alloy, titanium alloy, carbon fiber composite materials (epoxy / carbon fiber, phenolic aldehyde / carbon fiber and bismaleimide / carbon fiber) and glass fiber composite materials (epoxy / glass fiber and bismaleimide / glass fiber).