Direct heating cathode and preparation method thereof
A direct heating, cathode technology, applied in the field of electric vacuum, to increase the conductivity, prolong the life of the cathode, and increase the resistance to electronics.
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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0018] The invention discloses a direct heating cathode, which adopts rare earth oxide Y 2 o 3 The refractory oxide is used as the active material, and the active material is dip-coated on the surface of the pure tungsten wire cathode whose surface is a tungsten sponge layer. The direct heating type low-temperature high-current-density cathode of the invention can work at low temperature, and the lifetime of the cathode on the life table has exceeded 3000 hours.
[0019] The invention also discloses a method for preparing a direct heating cathode, which includes the following steps:
[0020] a. After evenly spraying a tungsten powder layer on the surface of the tungsten wire substrate, put it into a high-temperature hyd...
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