Effect of Lanthanum Zirconate on High Temperature
Resistance of Thermal Barrier Coatings |
Le Wang,a,
b Yuelan Di,b, * Haidou Wang,b, * Xuehuan Li,c Lihong Dongb and Tao Liua,
b
Pages: 212-218
DOI : 10.1080/0371750X.2019.1690582 |
Abstract |
Thermal barrier coatings (TBCs) typically have low thermal conductivity and high
resistance to oxidation at elevated temperatures. TBCs are used to protect the turbine
blades of aircraft engines operating at high temperature. The commonly used YSZ
(8 wt% Y2O3-stabilized ZrO2) cannot function at temperatures higher than 1200oC for
an extended period of time, which hinders the necessary improvement in the aircraft
thrust-to-weight ratio. In this work, thermal barrier coatings consisting of a YSZ
ceramic layer and of a lanthanum zirconate (LZ) + YSZ composite structure were
prepared on a nickel-based high-temperature substrate using atmospheric plasma
spraying. Thermal insulation properties and high temperature oxidation performance
of TBCs with single layer structure and double layer structure were compared. The
growth mechanism and influencing factors of high-temperature oxidation of thermally
grown oxide (TGO) were discussed. The results showed that the LZ had good thermal
insulation performance and oxygen isolation compared to the YSZ layer. This
performance effectively reduces the growth of TGO in TBCs, thereby delaying the
coating failure.
[Keywords: Thermal insulation properties, Lanthanum zirconate, Thermal barrier
coatings, Thermally grown oxide, High temperature oxidation] |
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