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Low-speed Water Vapor Corrosion Behavior of YSZ-based High-temperature Abradable Seal Coating at 1050℃
编号：14 访问权限：仅限参会人 更新：2026-09-13 21:48:48 浏览：3次 口头报告

报告开始：暂无开始时间（Asia/Shanghai）

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摘要
    High-temperature abradable seal coatings can narrow the gap between rotating blades and engine casings effectively, raising engine efficiency and ensuring operational safety. To address the durability challenges of coatings under the high water vapor environment of future hydrogen-blended gas turbines, this paper systematically investigates the corrosion behaviors and mechanisms of yttria-stabilized zirconia (YSZ) abradable seal coatings at 1050°C under two water vapor concentrations (9.5 vol.% and 30 vol.%). The results show that the as-sprayed coatings are mainly composed of non-equilibrium tetragonal zirconia (t'-ZrO2), with a small amount of monoclinic zirconia (m-ZrO2). During the 500 h water vapor corrosion test, the relative content of m-ZrO2 in the coatings decreases gradually with prolonged corrosion time, and high water vapor concentration accelerates this phase transformation. After 500 h of water vapor corrosion, the coatings maintain intact structures without penetrating longitudinal cracks or interlayer cracks. The polyester pore-forming agent in the top coat decomposes completely at high temperature, leading to an increase in coating porosity, accompanied by sintering and densification of the YSZ skeleton. A thermally grown oxide (TGO) with a dual-layer structure consisting of inner α-Al2O3 and outer Ni(Cr,Al)2O4 spinel forms at the interface between the top coat and bond coat. The above phenomena collectively indicate that although phase transformation and porosity variation occur in the top coat, and a dual-phase thermally grown oxide generates at the top coat/bond coat interface, the YSZ-based coating retains structural integrity and can withstand 500 h of corrosion under the low-speed water vapor environment at 1050°C. This research provides a basis for the design and performance evaluation of abradable seal coatings applied to advanced hydrogen-blended gas turbines.
关键词
abradable seal coating; air plasma spray; water vapor corrosion; phase transformation; sintering; thermally grown oxide
报告人
Yiping Zhang
Master Student Xi'an Jiaotong University

稿件作者
Yiping Zhang Xi'an Jiaotong University
冠军 杨 西安交通大学
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重要日期

  • 会议日期

    10月16日

    2026

    至

    10月18日

    2026

  • 10月15日 2026

    初稿截稿日期

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中国机械工程学会
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中国矿业大学
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