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SOFC composite materials were prepared from nanopowder mixtures of yttria stabilized zirconia - nickel oxide as anode and yttria stabilized zirconia - lanthanum manganite as cathode. The influence of particle size, pore former and sintering temperature on structure and properties of the electrode materials were investigated. The optimal conditions of full reduction of nickel oxide in anode materials...
The mechanical properties of nanoparticles (either Mo-Ni or SiC) reinforced Mo-Ni brazes were studied by microindentation. It was noticed that: (i) for MoNi near-eutectic fillers doped with 3% and composed of 100% Mo-Ni nanoparticles the non-eutectic phase features consistently a larger hardness than the eutectic phase. Fillers with various additions of Mo-Ni nanoparticles respond differently to the...
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 (N2+H2). The...
Flow of molten filler metal during high temperature brazing is a critical phenomenon in materials processing essential for dispenser cathode manufacturing. The presence of nano-particles in filler composite materials may impact resulting bond properties and joint integrity. This paper offers an insight into a new study of joint formation and behavior of the Mo/Ni braze filler doped by Mo/Ni nano-particles.
(Ni+RuO2)/Ni active cathodes were prepared by electrochemical co-deposition of suspended RuO2 particles along with Ni2+ ions onto Ni substrates from an electrolyte solution (Watt bath). Morphology and composition of the cathodes were investigated by SEM and EDX analysis. The observations revealed the RuO 2-Ni layers covered by cauliflower-like particles which distributed homogeneously on the Ni substrate...
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