High temperature brazing of porous tungsten with nano structured Mo-Ni for a dispenser cathode application

This paper offers an insight into a comprehensive study of liquid nano-composite braze filler spreading during bonding of porous tungsten to molybdenum. The considered application involves structural elements of a dispenser cathode. A new formulation of Mo-Ni filler doped with SiC nano-particles has been analyzed. The study involves a high temperature brazing in controlled atmosphere (N
₂
+H
₂
). The performed studies include DSC/TG analysis of nano-composites, SEM and EDS analyses of the re-solidified filler, the hot stage microscopy tests in real time and in situ, and microprobe studies of the liquid metal penetration into the tungsten porous matrix.