Abstract
The Si coating lifetime at 1350 ℃ is limited by the phase-transition-induced cracking of the SiO2 scale. In this study, Si-stabilizer duplex coatings were proposed to eliminate the unexpected phase transition. The results show that the diffusion of Al from the stabilizer to the SiO2 scale makes the high-temperature β-SiO2 retain metastability to room temperature, thus avoiding phase-transition-induced cracking. Compared with the service lifetime of the pure Si coating, the lifetime of the duplex coating at 1350 ℃ is increased by more than 4 times. This research points to a way to design Si coatings with improved service lifetimes.
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