The tungsten-rehenium-based barium-tungsten cathode is a special cathode material, whose structure and characteristics are mainly based on an alloy substrate of tungsten (W) and rhenium (Re), and active substances filled in the pores of the matrix – compounds of barium (Ba) and tungsten (W).
The tungsten-rehenium-based barium-tungsten cathode is widely used because of its advantages such as high pulse current emission density, long service life, resistance to ion bombardment and anti-poisoning. These characteristics make it an indispensable core component in modern microwave vacuum electronic devices (such as cyclotron traveling wave tubes, high-current linear induction accelerators, klystrons, etc.), providing these devices with a steady supply of electrons.
In the tungsten-rehenium-based barium-tungsten cathode, the porous tungsten matrix and the active substances filled in the pores of the matrix (such as barium-tungsten compounds) jointly determine the performance of the cathode. By optimizing the composition, pore size, pore uniformity of the matrix, and the type and content of the active substances, the emission performance and stability and reliability of the cathode can be further improved, and its service life can be extended.
Barium tungsten electrode has the characteristics of lower electron work function, higher electron current density, better starting performance and low temperature resistance, so it is often used as electrode material in photographic lights, electronic bayonet lights, skin rejuvenation and hair removal beauty lights, solar detectors, pump light sources, electric pulse sterilization, industrial counting lights, indicator lights and signal lights.
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