Thermal cycling behavior of Yb3+-Ce4+ co-doped La2Zr2O7-based TBCs: Experimental and theoretical research
Source abstract
Abstract
The thermal cycling behavior of Yb 3+-Ce 4+-La 2Zr 2O 7 /YSZ (LYZCO/YSZ) TBCs was systematically investigated via experiment and first-principles calculation. Results suggest that ceramic grain boundary cracking is the root cause of LYZCO/YSZ TBCs thermal cycle failure. Compared to La 2Zr 2O 7 /YSZ TBCs, LYZCO/YSZ TBCs own an outstanding thermal cycle life at 1100 ℃, which is attributed to LYZCO`s higher TEC (10.431×10 −6 /K, 1100 ℃) and lower thermal conductivity (1.299 W/(m·K), 1100 ℃). Furthermore, Griffith`s separation work of the LYZCO/YSZ interface is merely −0.576 J/m 2, implying that the LYZCO/YSZ TBCs are particularly prone to cracking at this interface. Weakly bonded La-O is the first site at this interface cracking.
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Research context
OpenAlex topics: Nuclear materials and radiation effects · Nuclear Materials and Properties · Advanced ceramic materials synthesis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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