Work

Corrosion Behavior and Degradation Mechanism of Novel Environmental Barrier Coatings (Yb1/5Y1/5Lu1/5Er1/5Ho1/5)2Si2O7 in High-Temperature Water-Oxygen Environments

Year: 2026

Type: article

Abstract: To address the performance degradation of conventional rare-earth silicate environmental barrier coatings (EBCs) in high-temperature water-oxygen environments, this study developed a novel high-entropy EBC system. The coating with a composition of (Yb1/5Y1/5Lu1/5Er1/5Ho1/5)2Si2O7/Si/SiC was prepared via atmospheric plasma spraying. Thermal cycling corrosion tests were conducted at 1400 °C under a 90% H2O–10% O2 atmosphere. Results show that after heat treatment, the monosilicate phase content decreased, and the structure stabilized. The coating surface exhibited a ridge-like morphology with pits and microcracks after corrosion. A porous corrosion layer formed at the edges, and the SiO2 layer thickness increased parabolically from 2.75 μm after 100 cycles to 5.65 μm after 300 cycles. The coating demonstrated excellent corrosion resistance, with degradation initiated by surface thermochemical corrosion, leading to corrosion layer formation and SiO2 accumulation. This study provides important insights for developing long-life EBCs for aero-engine applications.

Source: Coatings

DOI: 10.3390/coatings16020223

Authors: Xiaoqing Xing, Zhigang Yao, Mian Zhong, Wenjing Wang, Xuenan Wang

Institutions: Civil Aviation University of China, Civil Aviation Flight University of China

Language: English

Topic: High-Temperature Coating Behaviors

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funder: Civil Aviation Administration of China