TY - JOUR
T1 - Phase stability, microstructural and thermo-physical properties of BaLn2Ti3O10 (Ln=Nd and Sm) ceramics
AU - Guo, Lei
AU - Guo, Hongbo
AU - Ma, Guohui
AU - Gong, Shengkai
AU - Xu, Huibin
PY - 2013/8
Y1 - 2013/8
N2 - The phase stability, microstructural evaluation and thermo-physical properties of BaLn2Ti3O10 (BLnT, Ln=Nd and Sm) ceramics for thermal barrier coating (TBCs) application have been investigated. BLnT (Ln=Nd and Sm) powders is found thermally stable at 1500 °C after exposure for 110 h, and the bulk materials exhibit lamellar structure. BLnT (Ln=Nd and Sm) bulk materials show anisotropy in thermo-physical properties due to the insertion of Ba atoms between [Ln2Ti3O 10] (Ln=Nd and Sm) sheets. The thermal conductivities of BLnT (Ln=Nd and Sm) are apparently lower than those of ZrO2-8Y2O 3 (8YSZ). Also, BaSm2Ti3O10 exhibits relatively lower thermal conductivity as compared to BaNd2Ti 3O10. The thermal expansion coefficient (TEC) of BLnT (Ln=Nd and Sm) is found comparable to that of 8YSZ. BaNd2Ti 3O10 exhibits relatively larger TEC than BaSm 2Ti3O10. The above results suggest that BLnT (Ln=Nd and Sm) ceramics could be a good potential material for TBC applications.
AB - The phase stability, microstructural evaluation and thermo-physical properties of BaLn2Ti3O10 (BLnT, Ln=Nd and Sm) ceramics for thermal barrier coating (TBCs) application have been investigated. BLnT (Ln=Nd and Sm) powders is found thermally stable at 1500 °C after exposure for 110 h, and the bulk materials exhibit lamellar structure. BLnT (Ln=Nd and Sm) bulk materials show anisotropy in thermo-physical properties due to the insertion of Ba atoms between [Ln2Ti3O 10] (Ln=Nd and Sm) sheets. The thermal conductivities of BLnT (Ln=Nd and Sm) are apparently lower than those of ZrO2-8Y2O 3 (8YSZ). Also, BaSm2Ti3O10 exhibits relatively lower thermal conductivity as compared to BaNd2Ti 3O10. The thermal expansion coefficient (TEC) of BLnT (Ln=Nd and Sm) is found comparable to that of 8YSZ. BaNd2Ti 3O10 exhibits relatively larger TEC than BaSm 2Ti3O10. The above results suggest that BLnT (Ln=Nd and Sm) ceramics could be a good potential material for TBC applications.
KW - B. Microstructure-final
KW - BaLnTiO
KW - C. Thermal properties
KW - E. Thermal applications
UR - https://www.scopus.com/pages/publications/84877687338
U2 - 10.1016/j.ceramint.2013.02.003
DO - 10.1016/j.ceramint.2013.02.003
M3 - 文章
AN - SCOPUS:84877687338
SN - 0272-8842
VL - 39
SP - 6743
EP - 6749
JO - Ceramics International
JF - Ceramics International
IS - 6
ER -