TY - JOUR
T1 - Preparation and thermal conductivity of Sm 2(Zr 0.6Ce 0.4) 2O 7 ceramic
AU - Zhang, Hong Song
AU - Sun, Kun
AU - Xu, Qiang
AU - Wang, Fu Chi
AU - Liu, Ling
PY - 2009/11
Y1 - 2009/11
N2 - A pure Sm 2(Zr 0.6Ce 0.4) 2O 7 ceramic was prepared via solid-state reaction using ZrO 2, CeO 2, and Sm 2O 3 as the starting powders at 1600 °C for 10 h. The phase composition and microstructure were studied by X-ray diffraction (XRD), Fourier-transform infrared spectrometer (FT-IR), and scanning electron microscope (SEM). The thermal conductivity was measured by laser-flash method. The results indicated that the prepared ceramic had a pure fluorite structure. Its microstructure was dense with a relative density of 93.35% and there were no other unreacted oxides or interphases in the interfaces between grains. Because of the structure transformation from pyrochlore to fluorite, the synthesized product had a higher thermal conductivity than Sm 2Zr 2O 7 ceramic. However, the average thermal conductivity of Sm 2(Zr 0.6Ce 0.3) 2O 7 was lower than that of yttria-stabilized zirconia. The measurements of thermal conductivity suggested that the synthesized ceramic can be used as a new material for new thermal barrier coatings in the future.
AB - A pure Sm 2(Zr 0.6Ce 0.4) 2O 7 ceramic was prepared via solid-state reaction using ZrO 2, CeO 2, and Sm 2O 3 as the starting powders at 1600 °C for 10 h. The phase composition and microstructure were studied by X-ray diffraction (XRD), Fourier-transform infrared spectrometer (FT-IR), and scanning electron microscope (SEM). The thermal conductivity was measured by laser-flash method. The results indicated that the prepared ceramic had a pure fluorite structure. Its microstructure was dense with a relative density of 93.35% and there were no other unreacted oxides or interphases in the interfaces between grains. Because of the structure transformation from pyrochlore to fluorite, the synthesized product had a higher thermal conductivity than Sm 2Zr 2O 7 ceramic. However, the average thermal conductivity of Sm 2(Zr 0.6Ce 0.3) 2O 7 was lower than that of yttria-stabilized zirconia. The measurements of thermal conductivity suggested that the synthesized ceramic can be used as a new material for new thermal barrier coatings in the future.
KW - Ceramics
KW - Rare earth zirconate
KW - Thermal barrier coatings
KW - Thermal conductivity
UR - http://www.scopus.com/inward/record.url?scp=84863994017&partnerID=8YFLogxK
U2 - 10.1007/s11665-008-9346-x
DO - 10.1007/s11665-008-9346-x
M3 - Article
AN - SCOPUS:84863994017
SN - 1059-9495
VL - 18
SP - 1140
EP - 1143
JO - Journal of Materials Engineering and Performance
JF - Journal of Materials Engineering and Performance
IS - 8
ER -