Evaluation of Mechanochemically Synthesized NiO/SDC Composite Nanopowders for the Development of Nanostructured Cermet Anodes

Autor:	James P Hos, S. C. Singhal, M. Dokiya, Paul Mccormick
Rok vydání:	2003
Předmět:	Materials science visual_art Non-blocking I/O Composite number visual_art.visual_art_medium Sintering Ceramic Crystallite Cermet Conductivity Composite material Microstructure
Zdroj:	ECS Proceedings Volumes. :752-761
ISSN:	2576-1579 0161-6374
DOI:	10.1149/200307.0752pv
Popis:	Composite powders containing 35% NiO, 50% and 65% NiO/SDC have been mechanochemically synthesized. These materials were characterized as existing as 10-20 nm crystallites of NiO and SDC in 50-75 nm agglomerates. Compaction and sintering was achieved at temperatures below 1200°C, yielding composite ceramics with intermediate densities whilst maintaining crystallite sizes below 50 nm. SEM showed that the microstructure consisted of a sub-micron distribution of NiO and SDC domains which upon closer inspection had a sub-structure with 20-70 nm features. Cermet formation at 400°C by reduction in H 2 was monitored by measuring the conductivity. The 60 vol% Ni cermet had the highest conductivity of 2.5 S/cm. The optimum Ni content for cermets fabricated was between 50 and 60 vol%.
Databáze:	OpenAIRE
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