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      Densification behavior of yttria-stabilized zirconia powders for solid oxide fuel cell electrolytes

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          Abstract

          Yttria-stabilized zirconia (YSZ) is the most common electrolyte material for solid oxide fuel cells. Herein, we conducted a comparative study on the densification behavior of three different kinds of commercial 8 mol% YSZ powders: (i) TZ-8Y (Tosoh, Japan), (ii) MELox 8Y (MEL Chemicals, UK), and (iii) YSZ-HT (Huatsing Power, China). The comparison was made on both the self- supporting pellets and thin-film electrolytes coated onto a NiO–YSZ anode support. For the pellets, MELox 8Y showed the highest densification at lower sintering temperatures with 93% and 96% of the theoretical density at 1250 and 1300 ℃, respectively. Although YSZ-HT showed a higher sintering rate than TZ-8Y, a sintering temperature of 1350 ℃ was required for both the powders to reach 95% of the theoretical density. For the thin-film electrolytes, on the other hand, YSZ-HT showed the highest sintering rate with a dense microstructure at a co-sintering temperature of 1250 ℃. Our results indicate that besides the average particle size, other factors such as particle size distribution and post-processing play a significant role in determining the sintering rate and densification behavior of the YSZ powders. Additionally, a close match in the sintering shrinkage of the electrolyte and anode support is important for facilitating the densification of the thin-film electrolytes.

          Author and article information

          Journal
          Journal of Advanced Ceramics
          Journal of Advanced Ceramics
          Tsinghua University Press (Tsinghua University, Beijing 100084, China )
          2226-4108
          05 December 2018
          : 07
          : 04
          : 325-335 (pp. )
          Affiliations
          [1] aCollege of Aeronautics and Engineering, Kent State University, 1400 Lefton Esplanade, Kent, Ohio 44242, USA
          [2] bDepartment of Engineering Technology, Kent State University at Tuscarawas, 330 University Dr NE, New Philadelphia, Ohio 44663, USA
          Author notes
          * Corresponding author. E-mail: ydu5@ 123456kent.edu
          Article
          2226-4108-07-04-325
          10.1007/s40145-018-0282-4
          d15f480c-4b1f-4cb6-a14c-390c73592bae
          Copyright @ 2018

          © The Author(s) 2018. This article is published with open access at Springerlink.com

          Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

          History
          : 25 December 2017
          : 29 April 2018
          : 09 May 2018
          Categories
          Research Article

          Materials technology,Materials properties,Materials characterization,Composites,Ceramics
          densification,yttria-stabilized zirconia (YSZ),co-sintering,SOFC electrolyte,shrinkage

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