Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10626304 | Ceramics International | 2011 | 7 Pages |
Abstract
The effects of NiO addition on sintering yttria-stabilized zirconia were systematically studied to understand the role of the additive in the sintering process of the solid electrolyte. Specimens of 8Â mol% yttria-stabilized zirconia with NiO contents up to 5.0Â mol% were prepared using different Ni precursors and sintered at several dwell temperatures and holding times. Densification and microstructural features were studied by apparent density measurements and scanning electron microscopy observations, respectively. The sintering dynamic study was carried out by following the linear shrinkage of powder compacts containing 0-0.75Â mol% NiO. Small (up to 1.0Â mol%) NiO addition was found to improve the sinterability of yttria-stabilized zirconia. The activation energy for volume diffusion decreases with increasing NiO content, whereas the grain boundary diffusion seems to be independent on this additive. The grain growth of yttria-stabilized zirconia is found to be enhanced even for small NiO contents.
Keywords
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Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
R.M. Batista, E.N.S. Muccillo,