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(Ln 0.9 Gd 0.05 Yb 0.05 ) 2 Zr 2 O 7 Ceramics with Pyrochlore Structure as Thermal Barrier Oxides
Author(s) -
Liu Z.G.,
Ouyang J.H.,
Zhou Y.,
Li J.,
Xia X.L.
Publication year - 2008
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200800079
Subject(s) - materials science , pyrochlore , coprecipitation , ceramic , sintering , calcination , cubic zirconia , yttria stabilized zirconia , thermal barrier coating , metallurgy , analytical chemistry (journal) , inorganic chemistry , phase (matter) , catalysis , biochemistry , chemistry , organic chemistry , chromatography
(Ln 0.9 Gd 0.05 Yb 0.05 ) 2 Zr 2 O 7 (Ln = Sm, Nd) ceramics were synthesized by pressureless sintering at 1700 °C in air using powders with a chemical‐coprecipitation and calcination method. (Ln 0.9 Gd 0.05 Yb 0.05 ) 2 Zr 2 O 7 ceramics exhibit a single pyrochlore structure. The thermal expansion of (Ln 0.9 Gd 0.05 Yb 0.05 ) 2 Zr 2 O 7 ceramics are of the same order of magnitude as 7±1wt.% yttria‐stabilized zirconia (7YSZ). Thermal conductivities of (Ln 0.9 Gd 0.05 Yb 0.05 ) 2 Zr 2 O 7 ceramics are lower than that of 7YSZ. Thus, (Ln 0.9 Gd 0.05 Yb 0.05 ) 2 Zr 2 O 7 ceramics are potential candidates for high‐temperature thermal barrier applications.