Infiltration Behavior of CMAS in LZ-YSZ Composite Thermal Barrier Coatings
- Journal
- The Journal of The Minerals, Metals & Materials Society
- Vol
- 73
- Year
- 2020
- File
- 5.pdf (3.2M) 15회 다운로드 DATE : 2021-03-16 15:06:28
coatings (TBCs) is one of the reasons for the early delamination of TBCs. In
this study, the effects of CMAS on the microstructure evolution of TBCs were
investigated for yttria-stabilized zirconia (YSZ), lanthanum zirconate (LZ),
and composite coating with a 50:50 volume ratio of LZ and YSZ (LZ-YSZ). The
LZ showed the mitigated penetration of CMAS by the formation of the reaction
products produced by the high reactivity between the LZ and the molten
CMAS. The LZ-YSZ showed a denser microstructure on the surface, resulting
in retarding the penetration of CMAS. Therefore, the LZ-YSZ composite TBC
is expected to prolong the lifetime performance and protect against further
corrosive degradation of TBCs in high-temperature environments. The infiltration
behavior and reaction mechanism of molten CMAS were discussed
based on the microstructures after the corrosion test.