Ayahisa Okawa, Son Thanh Nguyen, Tadachika Nakayama, Thi-Mai-Dung Do, Hisayuki Suematsu, Shu Yin, Takuya Hasegawa, Tsuneo Suzuki, Takashi Goto, and Koichi Niihara, High-temperature corrosion of sintered RE2Si2O7 (RE = Yb, Ho) environmental barrier coating materials by volcanic ash, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2899-3
Cite this article as:
Ayahisa Okawa, Son Thanh Nguyen, Tadachika Nakayama, Thi-Mai-Dung Do, Hisayuki Suematsu, Shu Yin, Takuya Hasegawa, Tsuneo Suzuki, Takashi Goto, and Koichi Niihara, High-temperature corrosion of sintered RE2Si2O7 (RE = Yb, Ho) environmental barrier coating materials by volcanic ash, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2899-3
Research Article

High-temperature corrosion of sintered RE2Si2O7 (RE = Yb, Ho) environmental barrier coating materials by volcanic ash

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  • Received: 31 October 2023Revised: 27 March 2024Accepted: 2 April 2024Available online: 3 April 2024
  • Rare earth silicates are promising candidates for environmental barrier coatings (EBCs) to protect SiCf/SiCm substrates in next-generation gas turbine blades. Notably, RE2Si2O7 (RE = Yb, Ho) shows potential due to a coefficient of thermal expansion (CTE) that is compatible with the substrates, as well as its excellent water vapor corrosion resistance. The target operating temperature for next-generation turbine blades is set at 1400 °C. Therefore, the corrosion from adhering molten volcanic ash becomes inevitable, making it crucial to understand this corrosion behavior to ensure reliability. This study investigates the high-temperature corrosion behavior of sintered RE2Si2O7 (RE = Yb, Ho). The samples were prepared using a solid-state reaction and hot press method. They were then exposed to volcanic ash at 1400 °C for 2, 24, and 48 h. After 48 h of exposure, volcanic ash did not react with Yb2Si2O7 but penetrated through its interior, causing damage. Meanwhile, Ho2Si2O7 was partially dissolved in the molten volcanic ash, forming a reaction zone that preventing the penetration of volcanic ash melts into the interior. With increasing heat treatment time, the reaction zone expanded, and the apatite acicular-grain became thicker. The Ca:Si ratios present in the residual volcanic ash were mostly unchanged for Yb2Si2O7 but decreased significantly over time for Ho2Si2O7. The Ca in volcanic ash was consumed to form apatite, indicating that RE3+ ions with large ionic radii (Ho > Yb) easily precipitated apatite from the volcanic ash.

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