The application principle of barium-tungsten (Ba-W) cathode is mainly based on thermal electron emission. The following is its detailed working principle:
The barium-tungsten cathode uses the porous characteristics of the tungsten matrix to store active substances (such as BaO, CaO, Al2O3, etc., mixed in a certain proportion) in the tungsten sponge. When the cathode works at a certain temperature, the active substances filled inside it will react with the tungsten matrix to generate active barium atoms and gradually diffuse to the cathode surface. These barium atoms form a single atomic dipole layer on the cathode surface, reducing the surface work function, thereby increasing the number of thermal electrons emitted.
In this way, the barium-tungsten cathode can emit a large number of electrons, providing a continuous source of electrons for various vacuum electronic devices (such as cyclotron traveling wave tubes, high-current linear induction accelerators, klystrons, etc.). Due to its high pulse current emission density, long service life, resistance to ion bombardment and anti-poisoning ability, the barium-tungsten cathode plays the role of a core component in vacuum electronic equipment.
It is worth noting that the performance of the barium-tungsten cathode is mainly determined by two aspects: the porous tungsten matrix and the active material filling the pores of the matrix. Therefore, in the preparation process, it is necessary to select appropriate raw materials and preparation processes to ensure that the performance of the cathode is stable and reliable.
More details of tungsten barium electrode or tungsten barium cathode, please visit website: http://tungsten.com.cn/barium-tungsten-cathode.html
Please contact CHINATUNGSTEN ONLINE for inquiry and order of tungsten needles:
Email: sales@chinatungsten.com
Tel.: +86 592 5129595
