Effect of bond coating pre-oxidation on TGO growth behaviors and high- temperature oxidation resistance of thermal barrier coating

Abstract

Abstract: A dense Al₂O₃ layer was prepared at the ceramic/bond coating interface of thermal barrier coatings (TBC) by pre-oxidation technology. Isothermal oxidation tests were carried out at 1 100 ℃ to investigate the mechanism of Al₂O₃ layer reducing growth rates of thermally grown oxide (TGO) by inhibiting oxygen diffusion. The results showed that the TGO thickness and oxidation weight gain of as-sprayed TBC (A-TBC) and pre-oxidation TBC (P-TBC) increase by increasing the isothermal oxidation time. However, the P-TBC significant reduce oxygen diffusion in the entire oxidation process, and inhibite the TGO rapid growth at the initial stage of oxidation. This is contributed to P-TBC keeping a beneficial TGO structure, decreasing parabolic oxidation rate, and finally improving high-temperature oxidation resistance of TBC.

Key words: pre-oxidation, thermal barrier coating, thermally grown oxide

CLC Number:

TG174.4

AN Guo-sheng, LI Wen-sheng, FENG Li, CHENG Bo, LI Zi-yu, ZHOU Lan. Effect of bond coating pre-oxidation on TGO growth behaviors and high- temperature oxidation resistance of thermal barrier coating[J]. Journal of Lanzhou University of Technology, 2022, 48(6): 1-7.

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