Heat emission cathode and manufacturing method thereof

Abstract

The invention provides a heat emission cathode. The heat emission cathode comprises a U-shaped hot filament, one end of cathode base metal is connected with the center of a U-shaped bottom of the U-shaped hot filament, and the cathode base metal is coated with emission matter. The invention further provides a manufacturing method of the heat emission cathode. The method includes the steps that first, a tungsten-rhenium alloy wire is closely wound on a rectangular core bar, high temperature shaping is conducted, the tungsten-rhenium alloy wire is longitudinally cut off along the core bar after shaping, and accordingly the U-shaped hot filament is obtained; then, one end of tungsten-rhenium alloy foil serving as the cathode base metal is connected with the center of the bottom of the U-shaped hot filament, so that a cathode hot filament component is formed; finally, the cathode base metal is placed in triple carbonate turbid liquid for conducting electrophoresis. According to the heat emission cathode, an applicative hot cathode is provided for certain millimeter wave band ultrahigh frequency electron tubes with special structures or small structural sizes, the nonmagnetic performance of the cathode base metal can be guaranteed, high mechanical strength is achieved, the emitting matter can be evenly coated and can firmly adhere to the base metal, and qualified electron emission capacity is achieved as well.

Description

technical field [0001] The invention belongs to the field of cathode manufacturing of ultra-high frequency electric vacuum devices, and relates to a thermal emission cathode; the invention also relates to a manufacturing method of the thermal emission cathode. Background technique [0002] The ultra-high frequency electric vacuum device is the core device for generating ultra-high frequency electromagnetic wave signals in the whole radar system, and the cathode is the key component that provides the electron emission source for the ultra-high frequency electric vacuum device. For high-density electron emission, thermal emission cathodes are currently used, that is, stable high-density electron emission is obtained by heating the cathode emitter; from a large classification point of view, thermal cathodes include two types: oxide cathodes and barium tungsten cathodes, oxide cathodes The material cathode uses nickel or nickel-containing alloy as the base metal, and the ternary...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a thermal emission cathode to solve the problem of single-helix or double-helix thermal emission cathodes with special structures or millimeter-wave band ultra-high frequency electric vacuum devices with small structure size that cannot be manufactured by traditional methods

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