LaGdZrO/YSZ thermal barrier coatings by EB-PVD: Microstructure, thermal properties and failure mechanism

Zaoyu Shen; Zheng Liu; Rende Mu; Limin He; Guanxi Liu; Ziying Huang

Chemical Engineering Journal Advances (Mar 2021)

LaGdZrO/YSZ thermal barrier coatings by EB-PVD: Microstructure, thermal properties and failure mechanism

Zaoyu Shen,
Zheng Liu,
Rende Mu,
Limin He,
Guanxi Liu,
Ziying Huang

Affiliations

Zaoyu Shen: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing 100095 PR China; Corresponding author.
Zheng Liu: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing 100095 PR China; School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 PR China
Rende Mu: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing 100095 PR China
Limin He: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing 100095 PR China
Guanxi Liu: Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Beijing Institute of Aeronautical Materials, Aero Engine Corporation of China, Beijing 100095 PR China
Ziying Huang: Sichuan Gas Turbine Research Establishment, Aero Engine Corporation of China, Chengdu 610500 PR China

Journal volume & issue: Vol. 5
p. 100073

Abstract

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Advanced thermal barrier coatings (TBCs) have got an increasing number of attention in advanced aero-engine. The thermal cycling life and failure behavior still remain a big challenge under high temperature. This work focuses on the microstructure, element diffusion, and cracks evolution of the LaGdZrO/YSZ (LGZ/YSZ) double ceramic layers (DCL) TBCs. Characterizations mainly include X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and electron probe micro-analyzer (EPMA). The LGZ/YSZ DCL TBCs exhibit good thermal shock life and thermal cycling life. Element diffusion is investigated in detail, which is relevant with crack formation and propagation. After thermal cycling test, the failure regions mainly occur on the cracks regions and the interface regions. The interface instability plays a critical role on the failure behavior of LGZ/YSZ DCL TBCs.

Published in Chemical Engineering Journal Advances

ISSN: 2666-8211 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Chemical technology: Chemical engineering
Website: https://www.journals.elsevier.com/chemical-engineering-journal-advances

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