362 results about "Vacuum electronics" patented technology

The invention relates to an energy coupling device suitable for a rectangular-crossed double-gate slow-wave structure, belonging to the technical field of vacuum electronics. One end of the device is connected with a rectangular waveguide, and the other end is connected with a rectangular-crossed double-gate slow-wave structure; the part connected with the rectangular-crossed double-gate slow-wave structure comprises an upper row and a lower row of rectangular gate waveguide structures which are mutually staggered and distributed and have gradually changed height; the half-height positions of the rectangular gates at the upper row are in an upper datum plane (1); all half-height positions of the rectangular gates at the lower row are in a lower datum plane (2); counted from a port connected with the rectangular-crossed double-gate slow-wave structure, the heights of the upper row and the lower row of rectangular gates are gradually reduced to zero; and the maximum height of the rectangular gates does not exceed the rectangular gate height of the rectangular-crossed double-gate slow-wave structure. The invention has the advantages of favorably coupling a microwave signal into the rectangular-crossed double-gate slow-wave structure, favorably extracting the amplified microwave signal from the rectangular-crossed double-gate slow-wave structure and being easy to connect with a traditional standard waveguide device.

The invention relates to a preparation method for a waterproof laser film. According to the requirement in practical application of normal incidence 800nm pumping transmission and back incidence 1064nm fundamental frequency light reflection, an HfO2 and SiO2 film is prepared by a vacuum electron beam evaporation sedimentation technology and is taken as the film which has a large electric filed and is easy to damage due to being close to a base plate when being used as the back incidence, so as to obtain higher laser damage resistance threshold; aiming at the working condition of a water cooling system, for the films close to the water side and easy to be permeated and corroded, Ta2O5 and SiO2 films are prepared by an ion beam auxiliary sedimentation technology, so that the microstructure of the film is improved, higher stacking density is obtained, and good waterproof performance is realized; HfO2, Ta2O5 and SiO2 of high or low refractive index are deposited alternately so as to form a multi-layer film, and the optical thickness of each layer is controlled so as to obtain the needed spectral characteristic. The preparation method can well take advantages of the three characteristics and can apply the characteristics to a neodymium glass substrate of a diode pumping solid laser system, so that the diode pumping solid laser system can work in a water cooing system normally, and has good laser damage resistance performance and the spectral characteristic needed by the system.

The invention discloses a foamy carbon/paraffin type phase-change composite material and an encapsulation method thereof, and relates to the technical field of phase-change energy storage. The phase-change composite material comprises foamy carbon and paraffin filling holes of the foamy carbon, wherein the weight ratio of the foamy carbon to the paraffin is 1:1.2-1:3.1; and the mass fraction of hydrocarbon in the paraffin is more than 98%, and the hydrocarbon is solid at normal temperature. The encapsulation method comprises the following steps: 1, cleaning a container, a cover plate and the foamy carbon; 2, filling the foamy carbon; 3, welding the cover plate; 4, filling with liquid paraffin; and 5, sealing a filling opening and performing finish machining. The phase-change heat-storage composite material disclosed by the invention is high in heat conductivity and good in heat transfer performance, and can realize control of the distribution of cavity positions; and vacuum electron beams are adopted to seal and weld the filling opening, thereby ensuring that a paraffin phase-change material is absolutely sealed in a cavity of a container.

A cathode of the invention belongs to the field of vacuum electronics and the materials science, and in particular relates to an MIPM (multum in parvo mapping)-type internal field emitting cathode. The MIPM-type internal field emitting cathode is composed of a bottom electrode layer, an insulating layer, an electronic storage transmission layer and a top electrode layer; the emitting cathode is mainly characterized in that the electronic storage transmission layer adopts a porous silicon film material. In an alternating current AC driving mode, a functional layer not only can transport electrons, but also can store the electrons so as to improve the emitting efficiency. Compared with the prior art, the MIPM-type internal field emitting cathode has the advantages of great emitting current and good stability; and due to the strong environment adaptability, the cathode not only can work in the gas, but also can work in the liquid.

The invention provides a rectangular-grooved loading winding waveguide slow wave line, relating to a travelling wave tube amplifying device in the technical field of microwave vacuum electronics. A series of arc (or right-angle) bend waveguides and straight waveguides are connected end to end to form a winding waveguide structure; each bend waveguide is inboard provided with an opening along the broadside direction of the waveguides; each opening position is connected with a rectangular groove; the whole winding waveguides and the chambers of the rectangular-grooves are mutually communicated; the central axis symmetric line of the winding waveguide structure, the straight waveguides walls and the rectangular-grooved walls are provided with circular through holes at the points of intersection thereof; then two through holes of all adjacent straight waveguide walls and rectangular-grooved walls are connected by metal tubes with the same aperture size as the aperture size of the circular through holes to form an electron bunch channel. In the invention, the rectangular grooves featuring periodic loading are used for improving field distribution in conventional winding waveguide slow wave line; the slow wave line of the invention, compared with ordinary slow wave line, has higher coupling impedance, higher power gain and output power and smaller volume.

The invention discloses a diamond energy transmission window for short millimeter wave traveling tubes and a manufacturing method of the diamond energy transmission window and belongs to the technical field of vacuum electronics. The diamond energy transmission window comprises an energy transmission window leaf, a connecting wave guide and sealing window frames. The sealing window frames connected with the waveguide are symmetrically arranged on the upper and lower portion of the diamond energy transmission window, and the diamond window leaf is hermetically clamped between the window frames. The manufacturing method of the diamond energy transmission window includes: a, selecting a substrate silicon wafer; b, installing the substrate silicon wafer in a microwave plasma chemical vapor deposition device; c, inflating hydrogen gas; d, starting plasma discharging; e, increasing air pressure and microwave power and increasing substrate temperature to 850-950 DEG C; f, adding methane and starting growing diamond; g, finishing growing and taking out of diamond materials; h, grinding, polishing and cutting to obtain the window leaf by laser; i, metalizing the window leaf; and j, welding the window leaf and the window frames by centering. The diamond energy transmission window is superior to sapphire windows in both matching performance and transmission loss.

The invention discloses a small all-metal slow wave device for a traveling wave tube or backward wave tube which works at a centimeter wave band or a millimeter wave band in the technical field of vacuum electronics. The small all-metal slow wave device comprises a cylindrical metallic wave conductor and annular sheet type metallic electric resonance pieces arranged inside the wave conductor at intervals, wherein the inner diameter of the cylindrical metallic wave conductor is not larger than one third of the free space wavelength of an electromagnetic wave working at a center frequency, an electron beam channel is formed in the middle of each annular sheet type metallic electric resonance piece, and two auricle-shaped through holes are symmetrically formed in the annular sheet body of each resonance piece. Due to the fact that the two auricle-shaped through holes generating electric resonance are symmetrically formed in the annular sheet body of each resonance piece, electromagnetism intercoupling is effectively eliminated, and only the electric resonance generated by electric dipoles exists. Taking a slow wave device working at the S waveband as an example, the cross section of the all-metal slow wave device is only 35%-50% that of a traditional coupled cavity traveling wave tube. Thus, the all-metal slow wave device has the advantages of being small in size, simple in structure, high in power capacity, output power and interaction efficiency, capable of being produced in an industrialized mode easily and the like.

The invention discloses a radial EIO (extended interaction oscillator) for a high-power source, belongs to the technical field of vacuum electronics, and relates to a high-power micro-wave and millimeter wave source technology. The invention designs a radial EIO adopting circular sheet electron beam under the limit of the cathode current emission density. The radial EIO comprises two disk bodies, a cathode, an insulated circular ring-shaped piece and an electron beam channel, wherein the disk bodies are symmetrically arranged in the longitudinal direction, and each disk body is provided with a control anode head and circular ring-shaped grooves. The EIO can obtain higher power under small current density by increasing the electron emission area and an electron beam channel area; compared with EIOs adopting other structures, the EIO can meet the requirement for high-power output; the EIO has better cooling capacity, and meanwhile, due to the specific cylindrical symmetry structure, machining becomes simple, and the assembly error can be effectively reduced; the cathode of an electron-optical system is located in the center of a device, the structure is compact, and the shock-proof performance is better.

An energy output structure of a panel vacuum electron device belongs to the technical field of vacuum electronics. The energy output structure of the panel vacuum electron device comprises a panel slow wave structure (1), rectangular inclined waveguide (2) and rectangular straight waveguide (3). The sizes of narrow sides and wide sides of the panel slow wave structure (1), the rectangular inclined waveguide (2) and the rectangular straight waveguide (3) are uniform, the rectangular straight waveguide (3) is parallel to the panel slow wave structure (1), and two ends of the rectangular inclined waveguide (2) are connected with the rectangular straight waveguide (3) and the panel slow wave structure (1) respectively in inclined mode. The energy output structure solves the problems of electron collection and energy output of the high-power panel vacuum electron device, achieves integration of a collector and the energy output structure, and is simple in structure, easy to machine and high in output efficiency.

The invention discloses a complete set of blank assembly equipment for lamination and compounding of dissimilar metals. Workshop No. 1 is sequentially equipped with double plate turnover warehouse, plasma welding splicing equipment, weld seam grinding table, surface grinding table, coating table, and pressure assembly recording unit, narrow gap automatic gas-shielded welding long-side edge-banding unit, gas-shielded welding short-side edge-banding unit, flaw detection and inspection unit, turnover warehouse for finished welded slabs, workshop No. Plate alignment device, CNC gantry surface milling device, isolating agent drying device, vacuum electronic welding unit, and finished welded billet turnover warehouse; the dissimilar metal lamination composite complete set of billet assembly equipment of the present invention has high production efficiency, energy saving and environmental protection, and adopts advanced production methods It is in line with the development direction and trend of the future metal composite material production field.

The invention discloses a vacuum electron beam welding method and the application of the vacuum electron beam welding method to welding of the hydroelectric steel. The vacuum electron beam welding method comprises the steps of surface treatment, combination, vacuum electron beam defocusing blowing, vacuum electron beam preheating welding, vacuum electron beam fusion welding, vacuum electron beam local heat treatment and vacuum-keeping slow cooling. The vacuum electron beam welding method aims to achieve vacuum electron beam welding of two pieces of hydroelectric steel, the welding efficiency is high, the welding performance is stable, the welding quality is excellent, the weld joint quality meets the GJB 1718-2005 I-level requirement, the strength coefficient of the welded joint is larger than or equal to 0.91, the requirement for welding of large-thickness hydroelectric steel billets can be completely met, and the vacuum electron beam welding method can be applied and popularized to welding of large-size components which are made of other materials, poor in welding performance, complicated in welding technology and large in workload.

The invention relates to a graphite fiber and a preparation method thereof. The graphite fiber serving as a monomer fiber directly grows by adopting a vapor deposition method under the condition of no catalyst; the purity of obtained products is greater than 99.99 percent; the obtained products are straight and filamentous in appearance, the diameter range is 0.1 to 50mu m and the length range is 3 to 100mm; the products are generally parallel to one another; a hemispherical sealing cover is arranged at the top of each product and the interior of the fiber is solid; Raman spectrum shows that the intensity of a G peak is greater than that of a D peak in the graphite fiber; the graphite fiber has a metallic luster under the irradiation of visible light, and the resistivity of the graphite fiber is equivalent to that of graphite. The graphite fiber uses a quartz plate as a substrate, adopts argon and hydrogen as carrier gases, selects methane as a carbon source, and is prepared by cleaning the substrate, charging into a furnace, carrying out vapor deposition growth and sampling. With a special form and physical properties, the performance consistency between devices can be ensured when the graphite fiber prepared by the method is used for producing vacuum electronic devices such as a cold field emission electric gun filament.

The invention discloses a diamond / metal composite material clamping rod and a manufacturing method of the diamond / metal composite material clamping rod, belongs to the technical field of vacuum electronics, and relates to clamping rods for traveling-wave tubes. The diamond / metal composite material clamping rod solves the problems that BeO and other materials can not meet heat dissipation requirements of the traveling-wave tubes, natural and artificial diamond large monocrystal materials are high in cost and difficult to manufacture, and CVD self-supporting thick films are high in cost, prone to brittle failures, and difficult to assemble. The diamond / metal composite material clamping rod comprises three layers, wherein the top layer and the bottom layer are made of CVD diamond films, the middle layer is a metal layer, the metal layer is wrapped by artificial diamond particles which are approximate in particle size and the same in crystal orientation, and the diamond particles are connected with the CVD diamond film on the top layer and the CVD diamond film on the bottom layer. The diamond / metal composite material clamping rod is short in manufacturing period, low in cost, high in toughness, and not prone to brittle failures.

The invention discloses a high-voltage lead assembly for an ultrahigh vacuum device and a manufacture method thereof, which relate to vacuum electronic technology. The high-voltage lead assembly comprises a metal lead, insulation porcelain, ceramic sealing alloy and a lead flange. The high-voltage lead assembly has the advantages of being high in structure strength, compact in size, good in voltage withstanding effect and favorable for improving reliability and high voltage application range of the ultrahigh vacuum device. The structure design, the materials, the manufacture process and the like of the high-voltage lead assembly are provided.

The invention belongs to the technical field of superconducting material processing. The invention relates to a preparation method of a Ti-doped internal tin method Nb3Sn precursor wire. The method comprises the steps that hexagonal Cu/Nb-Ti/Nb composite bars are manufactured, the multiple Cu/Nb-Ti/Nb composite bars and a center Cu bar are arranged in a primary copper sheath containing a barrier layer, and the multi-core composite bars are machined through the procedures of vacuum electron beam welding sealing, hot isostatic pressing, hot extrusion and the like; the multi-core composite bar issubjected to center drilling, Sn or Sn alloy bars are inserted into the multi-core composite bar, Cu-Nb-Sn sub-components are machined, the multiple sub-components are arranged in a secondary copper-clad sleeve, plastic machining such as drawing and rolling is conducted, and finally the Ti-doped Nb3Sn precursor wire with the internal tin method is machined. The Nb3Sn wire rod prepared by the method is not easy to break in the plastic processing process, each performance index is equivalent to each performance index of the wire rod prepared by a conventional method, the rate of finished products of wires is higher, and the preparation cost of the wire rod is lower.

The invention discloses a gradient ridge loading tortuous waveguide slow wave line, and belongs to the technical field of microwave vacuum electronics. The slow wave line is formed by alternately connecting a series of arc bent waveguides (or right-angled bent waveguides) and straight waveguides end to end, equivalently a rectangular waveguide (1) is periodically bent into a tortuous waveguide structure along an electric field surface. A gradient metal ridge sheet (4) is loaded on the inner wall of the straight waveguide of each tortuous unit; and a circular through hole is formed in a middle axis symmetric line (2) on the waveguide wall and the metal ridge sheet along the slow wave structure, and the circular through holes of the straight waveguides of the two adjacent tortuous units are connected by adopting a metal pipe (3) with the same size as the apertures of the circular through holes to form an electron injection channel. When relatively high coupling impedance of the ridge loading tortuous waveguide slow wave line is kept, the standing wave coefficient of the ridge loading tortuous waveguide slow wave line can be reduced, and the transmission property of the slow wave line is improved; and the reflecting oscillation of a ridge loading tortuous waveguide traveling wave tube is inhibited, so that the ridge loading tortuous waveguide traveling wave tube has higher gain and efficiency.

The invention discloses a hollow oxygen-free copper bar vacuum electron beam welding method, a current lead and a nuclear fusion device. The method comprises the steps of positioning welding, penetration fusion welding, modified welding and the like. The current lead comprises an integral hollow oxygen-free copper bar formed through the hollow oxygen-free copper bar vacuum electron beam welding method, and the current lead is adopted in the nuclear fusion device. According to the welding method, welding between hollow oxygen-free copper bars is stable, the welding line width is uniform, splashing is little, arc extinguishing is full, and the characteristics that a welding connector is good in sealing performance and high in tensile strength are achieved; and the current lead manufactured after welding and the nuclear fusion device applying the current lead have the advantages that the performance is stable and the service life is long, wherein the advantages are brought by the above effects.

The invention discloses a vacuum electron beam welding deformation control method and device for an aero-engine flame tube. Safety pins with the same number of mixing holes in the outer ring or innerring of the flame tube are adopted, and position and detection are carried out three times at two different positions. According to the vacuum electron beam welding deformation control method and device for the aero-engine flame tube, the problem that the position degree is large after the flame tube undergoes vacuum electron beam welding is solved, a device for pre-welding control and post-welding detection is adopted for inspecting an pre-welding butt joint gap and the relative position degree of film holes of the inner and outer ring of the flame tube and detecting the position degree of the film holes of the inner and outer ring of the flame tube after welding is carried out by specific welding parameters.

The invention discloses a method for processing the surface of a Cu electrode of a multistage depressed collector through graphene, relates to the technology of vacuum electronics, and provides a novel collector processing technology applicable to a high-efficiency travelling-wave tube. According to the method, a grapheme coating is adopted and can be directly used for processing the oxygen-free copper electrode, secondary electron emission is restrained, the recovery efficiency of the multistage depressed collector is improved, and the overall efficiency of the travelling-wave tube is improved. The method is simple in process, controllable in technology and low in cost, and the processed multistage depressed collector can achieve the same secondary electron emission restraining effect as a collector made of graphite. The processed multistage depressed collector has the advantages of a traditional graphite collector, has higher mechanical performance, electric conduction performance and heat conduction performance, and solves the problems that the structure is loose, strength is low and the graphite collector is prone to generating graphite dust under a long-term bombardment of electron beams, thereby effectively improving the efficiency and reliability of the travelling-wave tube.

The invention relates to the material and metallurgy technology, in particular to a preparation method of an aerospace grade molybdenum and aluminum alloy. The preparation method is characterized in that by controlling vacuum electron beam smelting parameters, the reaction is kept within a reasonable speed range, and uniform distribution of the molybdenum element in the molybdenum and aluminum alloy is facilitated. By adding aluminum shot again before vacuum electron beam smelting, aluminum element losses caused by high temperature are counteracted under the condition of electron beam smelting, and the aluminum element content of the final product reaches a set value. The preparation method of the aerospace grade molybdenum and aluminum alloy has the beneficial effects that the molybdenum element in the produced molybdenum and aluminum alloy is uniform in distribution, the impurity element content is small, the aluminum element content is stable, and the requirement of the aerospace grade molybdenum and aluminum alloy is met.

A vacuum tube that may include but is not limited to a plurality of electrodes. A first electrode of the plurality of electrodes may be configured to operatively connect to an electrical source. A second electrode of the plurality of electrodes may be configured to operatively connect to a first load of a plurality of loads, wherein the first electrode may be configured to complete a first circuit through the second electrode and the first load. A third electrode of the plurality of electrodes may be configured to operatively connect to a second load of the plurality of loads that is independent from the first load, wherein the first electrode may be configured to complete a second circuit through the third electrode and the second load.

The invention discloses a cooling crucible for vacuum electron beam smelting. The cooling crucible comprises a crucible body with a material pool being formed in the top center, and a base fixedly connected with the bottom of the crucible body. According to the water cooling crucible, different flow channel design modes are adopted for different positions, the pertinence is high, the water cooling effect and uniformity of the water cooling pipe crucible can be effectively ensured, meanwhile, no weld joint is formed in the crucible body through the two flow channel designs, the potential risk of water leakage is avoided, the equipment reliability is improved, and the machining cost is lowered; and through the mode of drilling water holes and embedding water guiding pipes in the water holes and sleeve internal and external circulation, a circulation water channel is formed jointly, the machining precision can be ensured, the water channel cooling area can be adjusted flexibly by adjusting the hole diameter, the water hole position and the water tank width, thus, the cooling area is increased, and different heating load requirements are met.