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Strengthening of Gadolinia‐Doped Ceria (Ce 0.80 Gd 0.20 O 2‐δ ) Thick Ceramic Membranes with Co‐Doping of 1 mol% CuO
Author(s) -
Cao Jingjie,
Dong Xinfa,
Dong Yingchao,
Feng Xuyong
Publication year - 2014
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12311
Subject(s) - materials science , flexural strength , doping , ceramic , relative density , combustion , composite material , microstructure , chemical engineering , chemistry , optoelectronics , engineering
Nano‐sized Ce 0.79 Gd 0.2 Cu 0.01 O 2‐δ ( CGCO ) and Ce 0.80 Gd 0.2 O 2‐δ ( CGO ) powders were synthesized via a facile PVA ‐assisted combustion method. Full densification can be achieved at much lower temperature (950°C) with minor CuO doping (1 mol%, CGCO ) as compared with CGO (1400°C); meanwhile, mechanical strength can be enhanced with CuO co‐doping. The CGCO sintered at 1100°C possesses a relative density of 98.80% and biaxial flexural strength of 302 ± 35 MP a, which is higher than those of CGO sintered at 1400°C (96.43%, 250 ± 39 MP a). A tentative microstructural analysis indicates that this strength enhancement can be attributed to a change in fracture mode from partial to complete transgranule dominant.