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<p>The corrosion resistance and erosion process of 16&#xa0;mol% TaO<sub>2.5</sub> + 16&#xa0;mol% YO<sub>1.5</sub> co-stabilized ZrO<sub>2</sub> (YTZ) against CMAS composite corrosives were systematically investigated. Results demonstrate that the morphology of the corrosive deposits and the YTZ corrosion layer is different but remain continuous before and after the melting temperature. At 1100&#xa0;℃, the corrosive molten salts exhibit obvious self-crystallization behavior. With the temperature rises, the corrosion depth increases gradually. The addition of Na<sub>2</sub>SO<sub>4</sub> and V<sub>2</sub>O<sub>5</sub> remarkably lowers the melting point, improves the wettability and reduces the viscosity of CMAS melts, thereby enhancing its penetration capability. Among these additives, V<sub>2</sub>O<sub>5</sub> exerts the most significant effect on the penetration and chemical corrosion, leading to the most severe degradation of YTZ ceramics by CMAS-V<sub>2</sub>O<sub>5</sub> composites, accompanied a remarkable increase in monoclinic phase with rising temperature. In contrast, the sole addition of Na<sub>2</sub>SO<sub>4</sub> weakens the chemical corrosion capacity of CMAS. The erosion process of CMAS composite corrosives follows a consistent pattern: initial physically penetrates, subsequent thermochemical reactions at the contact interface, and eventual disintegration of YTZ under the coupled thermomechanical and thermochemical effects.</p>

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Corrosion behavior of YTZ ceramics exposed to CMAS composite corrosives

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Yinghui Wang,
  • Shunan Ke,
  • Jinshuang Wang,
  • Bing Liu,
  • Zuodong Liu,
  • Yongshang Tian,
  • Qiangshan Jing

摘要

The corrosion resistance and erosion process of 16 mol% TaO2.5 + 16 mol% YO1.5 co-stabilized ZrO2 (YTZ) against CMAS composite corrosives were systematically investigated. Results demonstrate that the morphology of the corrosive deposits and the YTZ corrosion layer is different but remain continuous before and after the melting temperature. At 1100 ℃, the corrosive molten salts exhibit obvious self-crystallization behavior. With the temperature rises, the corrosion depth increases gradually. The addition of Na2SO4 and V2O5 remarkably lowers the melting point, improves the wettability and reduces the viscosity of CMAS melts, thereby enhancing its penetration capability. Among these additives, V2O5 exerts the most significant effect on the penetration and chemical corrosion, leading to the most severe degradation of YTZ ceramics by CMAS-V2O5 composites, accompanied a remarkable increase in monoclinic phase with rising temperature. In contrast, the sole addition of Na2SO4 weakens the chemical corrosion capacity of CMAS. The erosion process of CMAS composite corrosives follows a consistent pattern: initial physically penetrates, subsequent thermochemical reactions at the contact interface, and eventual disintegration of YTZ under the coupled thermomechanical and thermochemical effects.