The Effects of Contact Paste Type and Electric Field on Physical Properties of Zirconia Bodies Made by Flash Sintering Method: Modeling Via Response Surface Methodology

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2020-12-10 DOI:10.22068/IJMSE.17.4.93

H. Mohebbi, S. Mirkazemi

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引用次数: 2

Abstract

Flash sintering of 8 mol % yttria-stabilized zirconia (8YSZ) as solid oxide fuel cell (SOFC) electrolyte is studied. The relation between relative density, shrinkage, sample temperature during the flash, and incubation time, with the electric field strength, current density, as well as contact paste, are modeled by response surface methodology (RSM). The electric field strength and current density varied from 50 to 400 V.cm-1 and 50 to 200 mA.mm, respectively. Also, platinum (Pt) and lanthanum strontium manganite (LSM) used as contact paste. Results show that using LSM paste lead to higher density and more shrinkage compare with Pt paste. In contrary, the electric field strength has no significant effect on density and shrinkage. However, a minimum electric field strength equal to 80 V.cm is necessary for flash onset. As the field increases, the incubation time decreases dramatically. Compare with samples with LSM paste, samples with Pt contact paste reach a higher temperature during the flash. Flash sintered 8YSZ shows the mean grain size of 0.3 μm, which is about half of the conventionally sintered 8YSZ. Electrochemical Impedance Spectroscopy reveals despite lower mean grain size, the resistivity of flash sintered 8YSZ is lower than conventionally sintered 8YSZ.

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接触膏体类型和电场对闪烧法制备氧化锆体物理性能的影响:响应面法建模

研究了8mol%氧化钇稳定氧化锆（8YSZ）作为固体氧化物燃料电池（SOFC）电解质的闪速烧结。通过响应面法（RSM）模拟了相对密度、收缩率、闪光过程中的样品温度和孵育时间与电场强度、电流密度以及接触糊之间的关系。电场强度和电流密度分别在50至400V.cm-1和50至200mA.mm之间变化。此外，使用铂（Pt）和镧锶锰酸盐（LSM）作为接触膏。结果表明，与Pt浆料相比，LSM浆料具有更高的密度和更大的收缩率。相反，电场强度对密度和收缩率没有显著影响。然而，等于80V.cm的最小电场强度对于闪光开始是必要的。随着磁场的增加，培养时间显著缩短。与使用LSM浆料的样品相比，使用Pt接触浆料的样品在闪光期间达到更高的温度。闪速烧结8YSZ的平均晶粒尺寸为0.3μm，约为常规烧结8YSZ的一半。电化学阻抗谱表明，尽管平均晶粒尺寸较低，但闪速烧结8YSZ的电阻率低于常规烧结8YSZ。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.