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Nickel/Yttria‐Stabilized Zirconia Cermets from Combustion Synthesis: Effect of Process Parameters on Product Microstructure
Author(s) -
AnselmiTamburini Umberto,
Arimondi Marco,
Maglia Filippo,
Spinolo Giorgio,
Munir Zuhair A.
Publication year - 1998
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.1151-2916.1998.tb02546.x
Subject(s) - cermet , materials science , yttria stabilized zirconia , thermite , microstructure , cubic zirconia , sintering , nickel , ceramic , combustion , chemical engineering , oxide , solid oxide fuel cell , hydrogen , metallurgy , aluminium , chemistry , organic chemistry , electrode , anode , engineering
The synthesis of a nickel/yttria‐stabilized zirconia (Ni/YSZ) cermet with tailored microstructural characteristics has much interest for many solid‐state electrochemical applications. These materials are generally obtained through a route based on the reduction, via hydrogen gas, of poorly sintered mixtures of YSZ with nickel oxide. The present paper proposes an alternative route based on a thermite reaction performed in a combustion regime. Such an approach indicates the application of combustion synthesis or a self‐propagating high‐temperature synthesis (SHS) technique. The more‐interesting features of this route include the absence of any external source of energy during the reaction, the possibility to synthesize a porous cermet in a single step, its sintering, and the doping of the ceramic component with yttria. The synthesis of Ni/YSZ cermets through this route is analyzed in some detail, and this analysis shows the influence of the process parameters on the phase composition and microstructure of the products.