17results about "Thermionic cathode manufacture" patented technology

The present application relates to a kind of hafnium foil for electric vacuum device and its preparation method, belong to microwave vacuum electron technology and refractory metal powder metallurgy field.The hafnium foil main content (hafnium+zirconium) ≥99.9wt%, thickness 0.01mm~0.15mm, size tolerance ≤±5 μm, tensile strength ≥450MPa, elongation after breaking ≥15%, main texture is <10‑10> / / RD.Preparation method includes: iodization purification, electron beam melting obtains high-purity hafnium ingot, is obtained foil material blank by hot forging breakdown, cross hot rolling, cross cold rolling, finally by vacuum stress relief annealing, cutting inspection and is prepared hafnium foil.The hafnium foil of the present application is high in purity, high in dimensional accuracy, strong and tough, isotropic degree is good, can be used for grid traveling wave tube spherical structure grid and other electric vacuum devices.

The invention provides a composite film M-type hot cathode and a preparation method thereof. The composite film layer M-type hot cathode comprises a barium tungsten cathode substrate, a Re3W alloy phase barrier layer and a noble metal surface layer, and the Re3W alloy phase barrier layer is formed between the barium-tungsten cathode substrate and the noble metal surface layer. The composite film layer M-type thermionic cathode can effectively prevent alloying between the tungsten substrate and the precious metal film layer, so that the emission capability of the cathode is improved, and the service life of the cathode is prolonged.

A method for manufacturing an electron source according to the present disclosure includes steps of: (A) preparing a first member provided with a columnar portion made of a first material having an electron emission characteristic, (B) preparing a second member which has a higher work function and a lower strength than the first material, and in which a hole is formed extending in a direction from one end surface toward the other end surface, and (C) pushing the columnar portion into the hole in the second member, wherein the first member has a cross-sectional shape that is dissimilar to the cross-sectional shape of the hole; and in the step (C), by pressing the columnar portion into the hole, a portion of a side surface of the columnar portion scrapes the inner surface of the hole and bites into the second member, thereby fixing the columnar portion to the second member.

The present application relates to a cathode and a manufacturing method thereof. The method includes: mixing and reacting cations containing a cathode element with a precipitant in a solution to obtain a gelatinous precipitate; and coating the gelatinous precipitate on a surface of a cathode substrate, which is configured for forming the cathode.

The application discloses a kind of solder, solder slurry, magnetron cathode assembly and preparation method thereof, it is related to magnetron cathode assembly field.Therein, solder is obtained by 15-40wt% tungsten, 30-60wt% molybdenum and 15-40wt% nickel mixed ball milling.Solder slurry includes organic carrier, solvent and solder, organic carrier is 5-15% of the weight of the solder, solvent is 5-20% of the weight of the solder.Lamp filament and molybdenum end cap in magnetron cathode assembly are brazed using the above-mentioned solder, specific operation method is that solder slurry is coated on molybdenum end cap, sintering forms solder layer, then again heating melts solder layer to weld and fix lamp filament and molybdenum end cap.The solder in the present application has the advantages of low cost, low brazing temperature and wide range, low vapor pressure, can improve the welding effect of lamp filament and molybdenum end cap while reducing the bubbling probability of molybdenum end cap, so as to improve the qualified rate of finished product of magnetron cathode assembly.

To provide an indirect heated cathode capable of shortening the time up to a start of radiation of thermoelectrons, and a method of manufacturing the indirect heated cathode in which a heat absorption layer which has a uniform thickness can be easily manufactured.SOLUTION: An indirect heated cathode 10 comprises a cathode sleeve 1, a heater 2 arranged at a hollow part of the cathode sleeve 1, a black heat absorption layer 4 covering a hollow part inner surface of the cathode sleeve 1, and a cathode base body 3 carrying an electron emission substance arranged at the cathode sleeve 1. The black heat absorption layer 4 consists of a particulate substance including tungsten and aluminum oxide. The black heat absorption layer 4 is formed by arranging rod-like alumina ceramics, and a first tungsten heater and a second tungsten heater in the hollow part of the cathode sleeve 1 and heating it in a vacuum atmosphere.SELECTED DRAWING: Figure 1

This invention discloses an oxide cathode and its sintering apparatus. The oxide cathode includes a cathode cylinder and a porous sponge layer. The cathode cylinder has two annular stepped surfaces, which are spaced apart from each other along the axial direction of the cathode cylinder. The cathode cylinder also has a sintering region located between the two stepped surfaces. The sponge layer is disposed within the sintering region, with its two ends respectively attached to the two stepped surfaces. Simultaneously, the sponge layer does not protrude from the stepped surfaces radially within the cathode cylinder. This invention can effectively suppress the axial scattering of electrons from the non-emission region of the oxide cathode, reduce interference with high-frequency fields, reduce the bombardment of the magnetron anode end cap by scattered electrons from the non-emission region, effectively solve the oxidation problem of the anode end cap during magnetron use, and improve the overall performance of the magnetron.

The invention relates to a hafnium foil for an electric vacuum device and a preparation method of the hafnium foil, and belongs to the field of microwave vacuum electronic technology and refractory metal powder metallurgy. The main content (hafnium + zirconium) of the hafnium foil is greater than or equal to 99.9 wt%, the thickness is 0.01-0.15 mm, the dimensional tolerance is less than or equal to + / -5 microns, the tensile strength is greater than or equal to 450 MPa, the percentage elongation after fracture is greater than or equal to 15%, and the main texture is lt; 10 <-10 > gt; / / RD. The preparation method comprises the following steps: performing iodination purification and electron beam melting to obtain a high-purity hafnium ingot, performing hot forging cogging, cross hot rolling and cross cold rolling to obtain a foil blank, and finally performing vacuum stress relief annealing and cutting inspection to obtain the hafnium foil. The hafnium foil disclosed by the invention is high in purity, high in dimensional precision, matched in strength and toughness and good in isotropy, and can be used for electric vacuum devices such as a grid-control traveling wave tube spherical structure grid mesh and the like.

The invention provides an assembly tool and an assembly method for a hot cathode filament, the assembly tool comprises a half base and a welding pressing block tool which are symmetrically arranged left and right, the half base is provided with a filament groove and two pin limiting tables, the size of the filament groove is accurately matched with the diameter of the filament, and an annular step of a conductive pin is limited on the pin limiting tables; the welding pressing block tool comprises a first pressing block and a second pressing block, and the first pressing block is used for limiting the transverse position of the lamp filament; one end of an L-shaped convex block on the second pressing block presses the lamp filament in the lamp filament groove, and the other end of the L-shaped convex block reserves an enough space, so that the lamp filament can be welded conveniently; and the welding of the other welding end of the lamp filament is realized by exchanging the positions of the first pressing block and the second pressing block. According to the invention, the symmetrically arranged Haff bases effectively control the position and deformation of the lamp filament in the assembly process, the unique design of the welding pressing block tool limits the transverse and longitudinal movement of the lamp filament, the welding space is reserved, and the position accuracy and consistency of lamp filament assembly are remarkably improved.

The purpose of the present invention, relating to lanthanide boride, which is known as a low work function material, is to provide a novel low work function material with low chemical reactivity, in particular a low work function material of which the material surface, after being exposed to atmospheric gases, can be cleaned at a heating temperature lower than in the prior art. The present invention is a laminate containing a lanthanide boride film formed on a substrate, the surface of said film being covered by a thin film, wherein the thin film is a monatomic layer of a hexagonal boron nitride thin film.

The invention discloses a thermal deformation compensation method for a cathode filament of an X-ray tube, and relates to the technical field of X-ray tubes. According to the thermal deformation compensation method of the X-ray tube cathode filament, the X-ray tube cathode filament comprises a filament body and filament pins formed at the two ends of the filament body, and the ends, close to the filament body, of the filament pins form filament pin heads. One end, far away from the lamp filament main body, of each lamp filament pin forms a lamp filament pin tail part; the thermal deformation compensation method for the cathode filament of the X-ray tube comprises the following steps: S1, establishing an initial cold state simulation model of the cathode filament of the X-ray tube, and performing thermal deformation simulation analysis on the cathode filament of the X-ray tube; and S2, processing the cathode filament of the X-ray tube based on the result of the thermal deformation simulation analysis. According to the invention, dynamic reverse pre-compensation can be accurately carried out on the thermal state deformation of the filament, and the stability of the cathode filament in a geometric state in a working thermal state is improved.

The invention provides a cathode assembly, a preparation method thereof and an electric thruster. The cathode assembly comprises a metal part, a boride ceramic part and a composite layer, the metal part and the boride ceramic part are connected through the composite layer, the composite layer comprises a carbide ceramic transition layer and a brazing layer which are arranged in a stacked mode, and the carbide ceramic transition layer is arranged between the connecting face of the boride ceramic part and the brazing layer. The brazing layer is arranged between the carbide ceramic transition layer and the connecting face of the metal part. Therefore, the service life and the reliability of the cathode assembly can be improved.

The invention belongs to the technical field of electric light source materials and manufacturing, and discloses a thorium-free cathode for a short arc discharge lamp and a preparation method and application of the thorium-free cathode. The preparation method of the thorium-free cathode for the short-arc discharge lamp comprises the following steps: S1, mixing raw materials and carrying out drying treatment; s2, the dried mixed powder is subjected to reduction treatment in a reducing atmosphere, and tungsten alloy powder is obtained; s3, the tungsten alloy powder is subjected to compression molding, sintering and vertical sintering, and a cathode blank is obtained; s4, the cathode blank is forged, and a cathode base body is obtained; and S5, a groove with an inverted triangular cross section is machined in the middle section of the cathode base body in the direction of the center axis of the cathode base body, and the thorium-free cathode for the short arc discharge lamp is obtained. According to the preparation method of the thorium-free cathode for the short-arc discharge lamp, through collaborative optimization of a material system and structural design, comprehensive improvement of the electron emission performance, the thermal stability and the service life of the cathode is achieved.

The invention belongs to the technical field of electric light source manufacturing, and discloses a thorium-tungsten cathode for a short-arc discharge lamp and a preparation method and application of the thorium-tungsten cathode. The preparation method of the thorium-tungsten cathode for the short arc discharge lamp comprises the following steps: S1, coating the surface of a thorium-tungsten cathode substrate with a heat treatment solution to obtain the thorium-tungsten cathode comprising a carbon source coating; and S2, carrying out segmented heat treatment on the thorium-tungsten cathode comprising the carbon source coating, and cooling to obtain the thorium-tungsten cathode for the short arc discharge lamp. According to the preparation method of the thorium-tungsten cathode for the short-arc discharge lamp, through specific material and process design, the surface components and the structure of the thorium-tungsten cathode are synergistically optimized on the microscopic level, the emission capability, the thermal erosion resistance and the long-term structural stability of the thorium-tungsten cathode are enhanced, and the comprehensive improvement of the short-arc discharge light output performance is jointly realized.

The invention relates to the technical field of electronic optical equipment and micro-nano machining, and discloses a field emission electron source. The field emission electron source is mainly composed of a filament base, a binding post, a welding post, a welding groove, a tungsten sheet, an emission tungsten needle and the like. During welding, the tungsten sheet is in direct contact with the side wall of the welding groove, so that original point contact between the tungsten filament and the welding column is replaced by surface contact by contact between the tungsten sheet and the side wall of the welding groove, the welding area is increased, the conditions of pseudo soldering, unsoldering and the like are reduced, and the welding quality and reliability are greatly improved; and two or more tungsten sheet welding structures can disperse thermal stress generated in the heating process to a plurality of welding spots, deformation of a single welding spot due to stress concentration can be avoided, the position offset of the emission tungsten needle is prevented, and then the emission stability of the electron source can still be ensured in a long-term heating environment.

The invention relates to the technical field of field emission electron sources, and discloses a method for in-situ preparation of a crystal electron source based on a transmission electron microscope. According to the method provided by the invention, in the TEM high-vacuum chamber, in-situ controllable physical or electric heating excitation is carried out on the cathode material by using the nano-hand, so that single-crystal or polycrystal nano-particles with clear sizes, shapes and crystal structures can be controllably prepared in a specific area on the surface of the cathode material; surface pollutants are also removed in the process, so that the preparation is clean; after preparation is completed, in-situ field emission testing can be carried out immediately, it is ensured that the tested performance is intrinsic performance of the cathode material and an ideal structure, and performance degradation caused by disjunction of preparation, transfer and testing links in a traditional method is thoroughly avoided; by utilizing the method, the high-reliability electron source with an ideal nano structure, a clean surface and excellent field emission performance can be directly produced, and the conversion efficiency and the reliability of the high-performance electron source from laboratory research to tip instrument commercialization are greatly promoted.

The present invention relates to an electron gun and a method for manufacturing the same, the electron gun comprising: a cathode which has an electron emission surface, has a circular planar shape, and emits electrons; a heater for raising the temperature of the cathode; and an anode for applying a positive potential to the cathode and leading out electrons in a certain direction. The cathode has a through-hole in the center portion thereof along the center axis of the cathode, and has a non-emission layer on at least one of the opening edge portion of the through-hole on the electron emission surface side and the inner surface of the through-hole, or the opening edge portion of the through-hole on the electron emission surface side is a chamfered C-surface or a chamfered R-surface.