Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10629286 | Journal of the European Ceramic Society | 2016 | 9 Pages |
Abstract
Microstructural evolution of Ba0.5Sr0.5Co0.8Fe0.2O3 â δ (BSCF) has been investigated using commercial powders sintered at different conditions. All the samples, characterised by the porosity P and grain size D, are determined to be a single cubic phase. The grain growth kinetics is evaluated using Dn = tK0exp(âQ/RT). Grain boundary diffusion is the dominant controlling mechanism of densification and the Ba/Sr diffusion is the rate-controlling species. Additionally, the Vickers hardness (HV) of BSCF is measured at ambient condition. The HV is successfully described by an exponential function of porosity, HV = H0exp(âbP). The porosity is the dominant factor determining the hardness when it is over 0.06. Otherwise, the Vickers hardness shows a dependence on pore size. Compared with the strong dependence of hardness on porosity, no correlation between hardness and grain size or grain orientation has been found.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Li Wang, Rui Dou, Mingwen Bai, Yizhe Li, David Hall, Ying Chen,