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Structure – Property Relationships of Ni/YSZ and Ni/(YSZ+TiO 2 ) Cermets
Author(s) -
Skarmoutsos D.,
Tietz F.,
Nikolopoulos P.
Publication year - 2001
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/1615-6854(200112)1:3/4<243::aid-fuce243>3.0.co;2-y
Subject(s) - cermet , materials science , yttria stabilized zirconia , anode , ceramic , annealing (glass) , microstructure , electrical resistivity and conductivity , metal , nickel , metallurgy , chemical engineering , cubic zirconia , composite material , electrode , chemistry , electrical engineering , engineering
Cermets composed of nickel metal and Y 2 O 3 ‐ZrO 2 ‐TiO 2 ternary ceramics were investigated by X‐ray diffraction, dilatometry, electrical and microstructural measurements and are regarded as improved anode materials with respect to long‐term stability. With increasing titania content it was possible to minimise the electrical and microstructural changes during long‐term annealing at 1000 °C in reducing atmosphere. Under these conditions a cermet containing a ceramic with 10 mol% TiO 2 showed a reduction in electrical conductivity of only 8% after 1000 h and a change in Ni particle size from only 1.6 to 1.8 μm. The results are explained in terms of an improved bonding strength at the interface between the ceramics and the metal due to a reduction of interfacial energy and are compared with results obtained with SOFC anode substrate materials.