Effect of Yb₂SiO₅ Ceramic Layer Thickness on the Thermal Cycling Life of Yb₂SiO₅⁄LaMgAl₁₁O₁₉ Coating Deposited on C⁄SiC Composites

Abstract:

C⁄SiC composites were plasma sprayed with Yb₂SiO₅⁄LaMgAl₁₁O₁₉ (LMA) coatings with varying Yb₂SiO₅ layer thickness. The effect of Yb₂SiO₅ layer thickness on the thermal cycling life of the Yb₂SiO₅LMA coatings was investigated. The results showed that the thermal cycling life is significantly dependent on the Yb₂SiO₅ layer thickness. It decreased from 130 cycles to 35 cycles as Yb₂SiO₅ layer thickness increased from 50 µm to 100 µm. Further increasing Yb₂SiO₅ layer thickness to 200 µm made it decrease to 2 cycles. The influencing mechanism of Yb₂SiO₅ layer thickness for the thermal cycling life was clarified based on the thermal expansion behavior, the chemical stability at high temperature and the microstructure analysis.

• Periodical: Key Engineering Materials (Volume 537)
• Pages: 36-41
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.537.36
• Online since: January 2013
• Authors: Ying Wang, Bing Lin Zou, Xi Zhi Fan, Xue Qiang Cao
• Keywords: C/SiC Composite, Coating Thickness, Failure Mechanism, Thermal Cycling

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