Synthesis and characterization of nano-brazing alloy for thermionic dispenser cathode application

A. K. Singh, S. K. Shukla, M. S. Bisht, S. E. Rahaman, J. Kalidoss, M. Debata and R. K. Barik

Journal of Electromagnetic Waves and Applications, 2017, vol. 31, issue 18, 2074-2080

Abstract: Development of thermionic cathode for use in vacuum electron devices is very much critical due to high-temperature operation. Brazing of the porous tungsten cathode button and molybdenum sleeve, puts the challenge of using a suitable braze material. The paper describes synthesis of a brazing alloy based on nano-composites of Mo–Ru–Ni. The synthesized powder was analyzed by Scanning Electron Microscopy coupled to Energy Dispersive Spectroscopy. The spreading/wettability, flowability, and melting characteristics of the synthesized nano-powder have been found superior to those of its mechanically mixed variant.

Date: 2017
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DOI: 10.1080/09205071.2017.1357505

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