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Low-speed Water Vapor Corrosion Behavior of YSZ-based High-temperature Abradable Seal Coating at 1050℃
ID：14 View Protection：ATTENDEE Updated Time：2026-09-13 21:48:48 Hits：38 Oral Presentation

Start Time：2026-10-17 15:25（Asia/Shanghai）

Duration：15min

Session：S4 Thermal/Cold Spray Coating Materials and Processes » S4Parallel Session

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Abstract
    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.
Keywords
abradable seal coating; air plasma spray; water vapor corrosion; phase transformation; sintering; thermally grown oxide
Speaker
Yiping Zhang
Master Student Xi'an Jiaotong University

Submission Author
Yiping Zhang Xi'an Jiaotong University
冠军 杨 西安交通大学
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Important Date

  • Conference Date

    Oct 16

    2026

    to

    Oct 18

    2026

  • Oct 14 2026

    Draft paper submission deadline

Sponsored By
中国机械工程学会
Organized By
扬州大学
中国矿业大学
中国机械工程学会表面工程分会
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