| 열차폐코팅용 La2Ce2O7−Gd2Ce2O7−Y2Ce2O7 Pyrochlore계의 고온 열전도도 |
| 윤소영, 이성민, 심광보1, 김형태 |
요업(세라믹)기술원 구조세라믹부
1한양대학교 신소재공학과 |
| High Temperature Thermal Conductivities in La2Ce2O7−Gd2Ce2O7−Y2Ce2O7 Pyrochlore System for Thermal Barrier Coatings |
| So-Young Yoon, Sung-Min Lee, Kwang-Bo Shim1, Hyung-Tae Kim |
Structural Ceramics Division, KICET
1Division of Advanced Materials Science and Engineering, Hanyang University |
|
|
|
|
|
| ABSTRACT |
|
Thermal conductivities in $La_2Ce_2O_7-Gd_2Ce_2O_7-Y_2Ce_2O_7$ ternary system have been investigated. Pyrochlore phases formed at all ternary compositions and their sinterbilities were decreased with La addition. Thermal conductivities showed a minimum value at $La_2Ce_2O_7$ with moderate increases as $Y^{3+}$ and $Gd^{3+}$ ions replaced $La^{3+}$. Thermal expansion anomaly observed in $La_2Ce_2O_7$, which might be detrimental to TBC application, were suppressed by $Y^{3+}$ and $Gd^{3+}$ additions, with resultant thermal conductivities, $1.3{sim}1.5 W/mK$ at $1000^{circ}C$. |
| Key words:
Thermal barrier coating, High temperature thermal conductivity, Pyrochlore, Thermal Expansion Coefficient |
|
PDF Links
Full text via DOI
Download Citation 
