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YSZ‐Induced Crystallographic Reorientation of Ni Particles in Ni–YSZ Cermets
Author(s) -
LagunaBercero Miguel A.,
Larrea Ángel
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01824.x
Subject(s) - cermet , materials science , yttria stabilized zirconia , non blocking i/o , eutectic system , ceramic , cubic zirconia , microstructure , phase (matter) , transmission electron microscopy , composite material , metallurgy , crystallography , nanotechnology , chemistry , biochemistry , organic chemistry , catalysis
Metal–ceramic interfaces in Ni–YSZ (YSZ, yttria‐stabilized zirconia)‐textured porous cermets prepared by reduction of NiO–YSZ directionally solidified eutectics have been studied by transmission electron microscopy and X‐ray pole figure experiments. Before reduction of NiO, the interfacial plane isbut after reduction, the Ni phase does not maintain the same crystallographic orientation as the NiO parent phase. Ni undergoes an interface‐induced crystallographic reorientation to form the lower energy (002) Ni ∥(002) YSZ interface. This process has been studied as a function of the reduction temperature, and it seems to be more effective at ∼800°C. Metal–ceramic low‐energy interfaces prevent Ni particle coarsening and impart long‐term stability to the cermet.