A kind of preparation method of rhenium-impregnated scandium-tungsten-based alloy cathode

Abstract

A method for preparing a rhenium-impregnated scandium-tungsten-based alloy cathode, the preparation method comprising: mixing metal scandium powder and tungsten powder to obtain evenly mixed scandium-tungsten alloy powder; mixing the scandium-tungsten alloy powder with (1.5-3)wt % nitrocellulose solution is evenly mixed, and the mixed solution is applied to the surface of the tungsten wire cathode substrate, and baked; the tungsten wire with scandium-tungsten alloy powder applied on the surface is placed in a high-temperature hydrogen furnace, and kept at 1350±50°C for 5-10 Minutes, the scandium-tungsten-based alloy layer is prepared; then, the surface of the scandium-tungsten-based alloy layer is impregnated with a mixture of metal rhenium powder and (1.5-3) wt% nitrocellulose solution, and then baked; the surface of the scandium-tungsten-based alloy layer is impregnated Put the tungsten wire with metal rhenium powder into a high-temperature hydrogen furnace, and keep it warm at 1500±50° C. for 5 to 10 minutes to prepare a rhenium-impregnated scandium-tungsten-based alloy cathode. The rhenium-impregnated scandium-tungsten-based alloy cathode prepared by the method of the present invention can increase the emission current density of the pure tungsten wire cathode for a magnetron, reduce the working temperature and surface evaporation rate of the pure tungsten wire cathode, thereby prolonging the life of the cathode and the magnetron .

Description

technical field [0001] The invention relates to a preparation method of rhenium-impregnated scandium-tungsten-based alloy cathode. Background technique [0002] At present, magnetrons are developing towards high output power. Ordinary barium tungsten cathodes, oxide cathodes, etc. are not resistant to electron and ion bombardment, are not resistant to anode high voltage, and are prone to ignition. application in magnetrons. Therefore, direct-heated pure tungsten (W) wire cathodes with weak emission power are widely used in medium and high power continuous wave magnetrons with high anode voltage. Compared with ordinary oxide cathodes and barium tungsten cathodes, pure W wire cathodes have the advantages of high emission stability, strong resistance to electron and ion bombardment, and strong resistance to poisoning. However, in the case of normal output power, the cathode of medium and high-power continuous wave magnetron generally works at a temperature above 2450K. Excess...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of rhenium-impregnated scandium-tungsten-based alloy cathode, which solves the problem that the life of the pure W wire cathode in the medium and high-power continuous wave magnetron leads to the short life of the magnetron, and has the following advantages: Improve the emission current density of the pure W filament cathode, reduce the operating temperature of the cathode, and prolong the service life of the cathode

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