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Tungsten-rhenium mixed powders were prepared by a spray drying method followed by two-step reduction process. The reduction process and sintering behavior of the W-Re powders and the DC emission properties of the W-Re mixed matrix dispenser cathodes have been studied. Porous microstructure for the W-Re mixed powders was developed during the hydrogen reduction process. With the increase of the rhenium content in the W-Re powders, the grain size of the matrix decreased dramatically and the sintering temperature has to be increased correspondingly in order to obtain appropriate apparent porosity. W-75at%Re mixed matrix cathode demonstrates the highest electron emission among the W-Re mixed cathodes studied, with direct current density reaching 10.73 A/cm2 at a temperature of 1000 °C. © 2015 IEEE.
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Proceedings of 2015 IEEE International Vacuum Electronics Conference, IVEC 2015
Year： 2015
Language： English
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ESI Highly Cited Papers on the List： 0 Unfold All
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30 Days PV： 4
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