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Investigating the Sintering Behavior of Porous Composites Made from Metallic Ni and YSZ Powders
Author(s) -
Clemmer Ryan M. C.,
Corbin Stephen F.
Publication year - 2010
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2010.02526.x
Subject(s) - materials science , yttria stabilized zirconia , sintering , non blocking i/o , composite material , nickel , metal , porosity , metallurgy , cubic zirconia , ceramic , catalysis , biochemistry , chemistry
The aim of this investigation is to characterize the influence Ni oxidation has on the sintering of tape‐cast Ni/YSZ composites made from coarse and fine nickel metal powders compared with preoxidized NiO/YSZ mixtures. During heating to 900°C, the NiO/YSZ composites shrink while the coarse Ni/YSZ composites expand, due to nickel oxidation. Fine Ni/YSZ powders do not exhibit oxidation‐induced expansion. Most densification occurs during high‐temperature sintering to 1475°C, the Ni/YSZ composites shrinking less than the NiO/YSZ composites. Analysis indicates that swelling due to Ni oxidation dominates the volumetric changes at low Ni contents, while sintering dominates at high Ni volumes.