Title

Extruded Tubular Strontium- and Magnesium-Doped Lanthanum Gallate, Gadolinium-Doped Ceria, and Yttria-Stabilized Zirconia Electrolytes Mechanical and Thermal Properties

Publication Title

Journal of The Electrochemical Society

Publication Date

2003

Document Type

Article

DOI

10.1149/1.1525268

Keywords

ceramics, solid, electrolytes, extrusion, bending, strength thermal, expansion, thermal, shock, solid, oxide, fuel, cells, cerium, compounds gadolinium, zirconium, compounds, yttrium, compounds lanthanum, compounds, strontium, magnesium

Disciplines

Chemical Engineering

Abstract

Thermal properties and mechanical strength of ceramic fuel-cell components are critical in allowing for rapid start-up and operational stability at high temperatures of solid oxide fuel cell (SOFC) systems. Tubular SOFC electrolytes were prepared using a plastic extrusion technique from a dough containing the electrolyte powders and additives. Strontium- and magnesium-doped lanthanum gallate (LSGM), gadolinium-doped ceria (CGO), and 8 mol % yttria-stabilized zirconia (YSZ) were studied. Burst failure strength, thermal expansion coefficients, and thermal shock resistance of the extruded tubular LSGM, CGO, and YSZ electrolytes were investigated and compared. Three-point bending strength of these three extruded electrolyte materials were tested at room temperature, 600, 800, and 1000°C in air, and the results are discussed. © 2002 The Electrochemical Society. All rights reserved.