Preparation of the bilayer-structured apatite layer resistant to CMAS wetting infiltration. (IMAGE)

Tsinghua University Press

Preparation of the bilayer-structured apatite layer resistant to CMAS wetting infiltration.

Caption

The bilayer-structured apatite protective layer was fabricated by pre-reacting GdPO4 with CMAS through precisely regulating the pre-reaction temperature, time, and CMAS concentration. Featuring an acicular upper layer and a compact lower layer, the protective layer exhibited low wettability to molten CMAS, excellent structural integrity after 50 h heat treatment at 1250 °C and 100 thermal cycles, and strong resistance to CMAS infiltration even after CMAS exposure for 20 h. The CMAS contact angle reached 17.4° at 1250 °C for 30 min, nearly three times that on Gd2Zr2O7, highlighting its potential as an effective CMAS-resistant protective layer for TBCs.

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Journal of Advanced Ceramics, Tsinghua University Press

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