Mechanical properties at the nanometer scale of GDC and YSZ used as electrolytes for solid oxide fuel cells

被引：107
|
作者：
Morales, M. [1 ,2 ]
Roa, J. J. [1 ]
Capdevila, X. G. [1 ]
Segarra, M. [1 ]
Pinol, S. [2 ]
机构：
[1] Univ Barcelona, Dept Ciencia Mat & Ingn Met, E-08028 Barcelona, Spain
[2] CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, Spain
来源：
ACTA MATERIALIA | 2010年 / 58卷 / 07期
关键词：
SOFC; Gadolinia doped-ceria; Yttria-stabilized zirconia; Mechanical properties; Nanoindentation; ELASTIC-MODULUS; INSTRUMENTED INDENTATION; FRACTURE PROPERTIES; HARDNESS; FILMS; SM;
D O I：
10.1016/j.actamat.2009.12.036
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The Young's modulus (E), hardness (H) and fracture toughness (K-IC) of various compositions of gadolinia doped-ceria (GDC, GdxCe1-xO2-x/2, 0.1 <= x <= 0.2) and yttria-stabilized zirconia (YSZ, Y0.08Zr0.92O1.96) electrolytes were investigated by nanoindentation. All samples were produced by the sol-gel method, formed by uniaxial pressure and sintered at 1400 degrees C. In order to determine the mechanical properties, a Berkovich diamond tip was employed at applied loads of 5, 10, 30, 100 and 500 mN. The results were interpreted by the Oliver-Pharr method and values of K-IC were determined using the method of Palmqvist cracks. The residual imprints were observed by field emission scanning electron microscopy. The results obtained showed that the H, E and K-IC of GDC decreased with increasing gadolinia concentration, due to the oxygen vacancies generated by the dopant addition. As a result, the mechanical properties of GDC were significantly lower than those of YSZ electrolyte. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2504 / 2509
页数：6
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