The life of a barium-tungsten cathode varies depending on the preparation process, working environment and specific application. Some studies have shown that by optimizing the preparation process and design, the life of a barium-tungsten cathode can reach a very long level.
For example, there is a long-life coated impregnated barium-tungsten cathode. Under accelerated life test conditions, when the cathode operating temperature is 960°C and the current density is 2A/cm², the cathode life exceeds 150,000 hours. This is equivalent to a cathode life of 12 to 15 years in actual use, meeting the development needs of space traveling wave tubes for long-life hot cathodes.
In addition, for barium-tungsten hollow cathodes, American researchers conducted a 1:1 test, and the results showed that the cathode service life exceeded 30,000 hours and the number of ignition cycles reached more than 32,000 times. The test results of DAWN show that the life of the barium-tungsten hollow cathode it uses is expected to exceed 40,000 hours.
However, it should be noted that the life of the cathode is affected by many factors, such as operating temperature, draw current, vacuum atmosphere, etc. Higher temperature and higher draw current can increase the loss rate of the cathode barium element due to evaporation, thereby shortening the life of the cathode. Therefore, in practical applications, these factors need to be considered comprehensively to optimize the life of the cathode.
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