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

页码：2504 / 2509

页数：6

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