There is no direct comparative data on the difference in the life of tungsten-rhenium-based barium tungsten cathode and tungsten-copper-based barium tungsten cathode. However, there may be some differences between the two from the perspective of material properties and applications.
Tungsten-rhenium-based barium tungsten cathodes have shown a long service life in research. For example, at a temperature of 1000°C, the current density of tungsten-rhenium-based barium tungsten cathodes remained above 3.0 A/cm2 during the first 18408 hours of life, and at 18408 hours, the emission current density was greater than 8% of the initial emission current density. This shows that tungsten-rhenium-based barium tungsten cathodes have stable electron emission performance and a long service life at high temperatures.
The life of tungsten-copper-based barium tungsten cathodes may be affected by the properties of the copper matrix material. Copper has a low melting point and high thermal conductivity, which may affect the stability and life of the cathode at high temperatures. However, the specific comparative data needs to be determined based on actual application conditions and test data.
In general, the life of tungsten-rhenium-based barium-tungsten cathodes and tungsten-copper-based barium-tungsten cathodes may be affected by many factors such as material properties, preparation process, working environment, etc. Therefore, when selecting cathode materials, it is necessary to evaluate and compare the performance of different materials based on specific application requirements and conditions.
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