The linear shrinkage during isothermal treatment in the early stages of conventional and field‐assisted sintering of 8YSZ was analyzed. The results reveal thatthe application of a moderate electric current causes a remarkable acceleration ofthe self‐diffusion kinetics, resulting in an enhanced densification. In addition,when an electric current is applied, two different field‐assisted sintering regimescan be identified. The first one, observed at low currents (ie 5 mA/mm2), is associated to sintering shrinkage which follows the conventional trend (ɛαt1=3)although the densification is accelerated. The second regime takes place when larger current are applied (J > 10 mA/mm2) and is described by a different sinteringlaw,ɛαt1=7, this pointing out that the electric current causes the activation ofalternative densification mechanisms when it exceeds a certain threshold value.
Electric current effect during the early stages of field-assisted sintering / Biesuz, Mattia; Rizzi, Davide; Sglavo, Vincenzo M.. - In: JOURNAL OF THE AMERICAN CERAMIC SOCIETY. - ISSN 0002-7820. - STAMPA. - 2019, 102:2(2019), pp. 813-822. [10.1111/jace.15976]
Electric current effect during the early stages of field-assisted sintering
Biesuz, Mattia;Sglavo, Vincenzo M.
2019-01-01
Abstract
The linear shrinkage during isothermal treatment in the early stages of conventional and field‐assisted sintering of 8YSZ was analyzed. The results reveal thatthe application of a moderate electric current causes a remarkable acceleration ofthe self‐diffusion kinetics, resulting in an enhanced densification. In addition,when an electric current is applied, two different field‐assisted sintering regimescan be identified. The first one, observed at low currents (ie 5 mA/mm2), is associated to sintering shrinkage which follows the conventional trend (ɛαt1=3)although the densification is accelerated. The second regime takes place when larger current are applied (J > 10 mA/mm2) and is described by a different sinteringlaw,ɛαt1=7, this pointing out that the electric current causes the activation ofalternative densification mechanisms when it exceeds a certain threshold value.File | Dimensione | Formato | |
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