Influence of cerium doping on mechanical properties of tetragonal scandium-stabilized zirconia

被引：10

作者：

Kubrin, Roman ^{[1
]}

Blugan, Gurdial ^{[1
]}

Kuebler, Jakob ^{[1
]}

机构：

[1] Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, Ueberlandstr 129, CH-8600 Dubendorf, Switzerland

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2017年 / 37卷 / 04期

关键词：

Electrolyte-supported SOFC; Scandium-stabilized zirconia; Cerium doping; Reducing atmosphere; Mechanical properties; OXIDE FUEL-CELLS; THIN SHEET ELECTROLYTES; ELECTRICAL-CONDUCTIVITY; PHASE-TRANSITION; FRACTURE TEST; TEMPERATURE; CERAMICS; TRANSFORMATION; SOFCS; POLYCRYSTALS;

D O I：

10.1016/j.jeurceramsoc.2016.11.038

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mechanical properties of tetragonal scandium-stabilized zirconium oxide (ScSZ) co-doped with cerium oxide are studied before and after a complete reduction of Ce4+ to Ce3+. Samples of 6Scl CeSZ (i.e., 6 mol% Sc2O3, 1 mol% CeO2), 6Sc2CeSZ, and 4Sc1 CeSZ are produced by pressure-less sintering in air at 1450 degrees C. Test pieces are annealed at 1200 degrees C in an atmosphere of forming gas (5% H-2, 95 % N-2). Vickers hardness, Young's modulus, 4-point bending strength, and fracture toughness are measured at room temperature. Values of hardness and Young's modulus are similar for different compositions of ScSZ:Ce and stay practically unaffected by the reduction. Both the fracture toughness and strength significantly decrease and the largest drop is measured for the 6Sc2CeSZ, having the highest concentration of cerium. The observed degradation of mechanical properties suggests that cerium-free electrolytes should be preferred for the fabrication of the electrolyte-supported planar SOFCs. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：1651 / 1656

页数：6

共 32 条

[1] Electrical conductivity of the ZrO2-Ln2O3 (Ln = lanthanides) system [J].