3results 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 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.

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.