Flash sintering of zirconia/alumina powders
March 10-15, 2019
Yttria-stabilized cubic zirconia (YSZ) is the most-common electrolyte material for solid oxide fuel cells due to its reasonable oxygen-ion conductivity and chemical stability. To achieve suitable ionic conductivities, YSZ ceramics must be near theoretical density, requiring sintering temperatures around 1450°C. In 2011, it was demonstrated that flash sintering densifies YSZ in a few seconds at 750°C.1 During flash sintering, an electric field is applied across the sample and at a certain threshold temperature, the sample conductivity and power dissipation rapidly increase causing densification. Since densification occurs in just a few seconds, grain growth can be difficult to control. During conventional sintering of YSZ ceramics, researchers have demonstrated that the addition of a small quantity of aluminum oxide (Al2O3) pins grain boundaries, reducing YSZ grain size.2 However, the effect of small quantities of Al2O3 addition on the grain growth of flash sintered YSZ has not been studied.
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Rebecca O'Toole, Bola Yoon, Christopher Gump, Rishi Raj, and Alan Weimer, "Flash sintering of zirconia/alumina powders" in "Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities", Rishi Raj, University of Colorado, USA Olivier Guillon, Forschungzentrum Jülich, Germany Hidehiro Yoshida, National Institute for Materials Science, Japan Eds, ECI Symposium Series, (2019). https://dc.engconfintl.org/efe_advancedmaterials_ii/6