Corrosion behavior and failure mechanism of SiC whisker and c-AlPO4 particle-modified novel tri-layer Yb2Si2O7/mullite/SiC coating in burner rig tests

Pengju CHEN; Peng XIAO; Xian TANG; Yang LI

doi:10.1007/s40145-022-0655-6

Journal of Advanced Ceramics 2022, 11(12): 1901-1917 https://doi.org/10.1007/s40145-022-0655-6

Research Article |

Open Access | Issue | Published: 29 November 2022

Corrosion behavior and failure mechanism of SiC whisker and c-AlPO₄ particle-modified novel tri-layer Yb₂Si₂O₇/mullite/SiC coating in burner rig tests

Show Author's Information Hide Author's Information Pengju CHEN^¹, Peng XIAO^², Xian TANG^¹, Yang LI^{²^,³}(

)

1 School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

2 Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

3 National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China

Keywords:

mullite, sol–gel, Yb₂Si₂O₇, tri-layer, burner rig test

Cite this article:

CHEN P, XIAO P, TANG X, et al. Corrosion behavior and failure mechanism of SiC whisker and c-AlPO₄ particle-modified novel tri-layer Yb₂Si₂O₇/mullite/SiC coating in burner rig tests. Journal of Advanced Ceramics, 2022, 11(12): 1901-1917. https://doi.org/10.1007/s40145-022-0655-6

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Abstract

The corrosion behavior of environmental barrier coatings (EBCs) directly affects the service life and stability of ceramic matrix composite (CMC) structural parts in the aero-engines. The silicon carbide (SiC) whisker toughening phase and c-AlPO₄ bonding phase are firstly used to improve the service life of novel tri-layer Yb₂Si₂O₇/mullite/SiC EBCs in the burner rig test. The formation of penetrating cracks in Yb₂Si₂O₇/mullite/SiC coating caused the failure of coating at 1673 K. The SiC whiskers in mullite middle coating significantly inhibited the formation of penetrating cracks in Yb₂Si₂O₇/mullite/SiC coating, and efficiently prevented the oxidation of carbon fiber reinforced silicon carbide (C_f/SiC) samples for 360-min thermal cycles (24 times) with a weight loss of 6.19×10⁻³ g·cm⁻². Although c-AlPO₄ particles further improved the service life of SiC_w–mullite (SM) coating, the overflow of PO_x gas aggravated the formation and expansion of cracks in the Yb₂Si₂O₇ outer coating, and caused the service life of overall Yb₂Si₂O₇/c-AlPO₄–SiC_w–mullite (ASM)/SiC coating to be slightly lower than that of Yb₂Si₂O₇/SM/SiC coating. This study guides the design of modified tri-layer EBCs with long service life in high-temperature and high-speed gas environment.

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Corrosion behavior and failure mechanism of SiC whisker and c-AlPO₄ particle-modified novel tri-layer Yb₂Si₂O₇/mullite/SiC coating in burner rig tests

Show Author's information Hide Author's Information Pengju CHEN^¹, Peng XIAO^², Xian TANG^¹, Yang LI^{²^,³}(

)

1 School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

2 Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

3 National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China

Abstract

Keywords: mullite, sol–gel, Yb₂Si₂O₇, tri-layer, burner rig test

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Acknowledgements

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Publication history

Received: 05 July 2022

Revised: 16 August 2022

Accepted: 31 August 2022

Published: 29 November 2022

Issue date: December 2022

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Acknowledgements

This work was funded by the National Key R&D Program of China (Grant Nos. 2021YFB3703800 and 2021YFB3703802), National Natural Science Foundation of China (Grant No. 52102122), National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University (Grant No. SYSJJ2021LWS01), and China Postdoctoral Science Foundation (Grant No. 2022M711540).

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