The diffused barium tungsten cathode uses the porous characteristics of the tungsten matrix to store active substances (mainly barium salts) in the tungsten sponge. Under working conditions, the salt reacts with the tungsten matrix, and the reduced free barium diffuses along the pores to the cathode surface to form a stable emission. This cathode has a high emission current density, good emission stability and emission electron uniformity, can operate stably for a long time at high temperatures, and can adapt to different operating voltages and current densities. Therefore, it is usually used in vacuum electronic devices that require high-performance electron emission, such as microwave vacuum electronic devices, high-power electron beam equipment, and displays.
The vacuum barium tungsten cathode refers to a barium tungsten cathode that works in a vacuum environment. Its specific working principle and performance characteristics may vary due to different designs and preparation processes. However, since the vacuum environment can reduce the interference of gas molecules on electron emission, the vacuum barium tungsten cathode usually also has higher electron emission performance and stability.
In practical applications, the choice of cathode depends on the specific application scenario and requirements. If high-performance electron emission and stability are required, and the working environment requirements are high, then the diffused barium tungsten cathode may be more suitable. If it is necessary to work in a vacuum environment and the requirements for electron emission performance are not particularly high, then the vacuum barium tungsten cathode may be a better choice.
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