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<p>The corrosion behavior of Gd<sub>2</sub>SrAl<sub>2</sub>O<sub>7</sub> (GSA) ceramic against CMAS melts at 1250 ~ 1350&#xa0;°C for 1 ~ 10&#xa0;h was investigated. Results demonstrated that GSA can react with CMAS melts to form the apatite compound of Ca<sub>2</sub>Gd<sub>8</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub>. At 1250&#xa0;°C, the corrosion products comprised apatite compound and GdSrAl<sub>3</sub>O<sub>7</sub>, whereas GdSrAl<sub>3</sub>O<sub>7</sub> gradually disappeared at 1350&#xa0;°C. Notably, selective leaching of Sr<sup>2+</sup> ions from GSA during corrosion process altered the residual CMAS composition, distinguishing its degradation mechanism from conventional aluminates. The temperature-dependent phase evolution and ion-leaching effects highlight GSA’s unique interfacial reactivity, enabling rapid GdAlO<sub>3</sub> layer formation. These findings establish GSA as a promising CMAS-resistant material.</p>

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Corrosion behavior of Gd2SrAl2O7 ceramic exposed to CMAS melts at 1250 °C and 1350 °C

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Junbin Sun,
  • Qiangsheng Wu,
  • Weihong Lu

摘要

The corrosion behavior of Gd2SrAl2O7 (GSA) ceramic against CMAS melts at 1250 ~ 1350 °C for 1 ~ 10 h was investigated. Results demonstrated that GSA can react with CMAS melts to form the apatite compound of Ca2Gd8(SiO4)6O2. At 1250 °C, the corrosion products comprised apatite compound and GdSrAl3O7, whereas GdSrAl3O7 gradually disappeared at 1350 °C. Notably, selective leaching of Sr2+ ions from GSA during corrosion process altered the residual CMAS composition, distinguishing its degradation mechanism from conventional aluminates. The temperature-dependent phase evolution and ion-leaching effects highlight GSA’s unique interfacial reactivity, enabling rapid GdAlO3 layer formation. These findings establish GSA as a promising CMAS-resistant material.