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摘要:
In this study, tungsten-rhenium (Re-W) dispenser cathodes are fabricated by cold-pressing and sintering of Re-W powder which was prepared by spray drying method followed by two-step hydrogen reduction. Emission performance of the cathodes was tested on a planar diode configuration. The elements distribution of rhenium and tungsten on the surface of 75at% Re-W cathode were also investigated by EPMA. Among the cathodes fabricated in different compositions, the 75at% Re-W cathode demonstrates the highest zero field emission current density of 14.03 A.cm(-2) at 1000 degrees C.
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来源 :
2015 IEEE INTERNATIONAL VACUUM ELECTRONICS CONFERENCE (IVEC)
年份: 2015
语种: 英文