| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Manufacturing and Processing of Advanced Ceramic Materials
|
| Presentation Title |
Mechanical Properties of La2Zr2O7/ ZrO2 Composites Prepared by Coating of ZrO2 Sol |
| Author(s) |
Bong-Gu Kim, Hyun-Hee Choi, GuanLin Lyu, JangHyeok Pyeon, Jung-Hun Son, SeungCheol Yang, Yeon-Gill Jung |
| On-Site Speaker (Planned) |
Bong-Gu Kim |
| Abstract Scope |
ZrO2 with 7–8wt% yttria (YSZ) is widely used as a thermal barrier coating (TBC) material owing to its high coefficient of thermal expansion (CTE) and low thermal conductivity. However, YSZ shows poor sintering resistance and phase stability, limiting its operating temperature to 1200℃. Even though La2Zr2O7 (LZO) is a promising material for the TBC with better phase stability and lower thermal conductivity than YSZ, it shortens the thermal cycle performance of TBC owing to its low fracture toughness and CTE. Therefore, the LZO/ZrO2 composite power was prepared to make up for the weak points of LZO. The ZrO2 sol was uniformly coated on the LZO powder, depending on processing parameters, and the composite improved the mechanical properties and CTE values compared to LZO. It was verified that the LZO/ZrO2 composite powder could be employed as a new feedstock for TBC that complements the shortcomings of LZO and YSZ. |