Work

Reactive self-consumption strategy to suppress SiO 2 phase transition-induced cracking

Year: 2025

Type: article

Abstract: The lifetime of Si bond coats in environmental barrier coatings (EBCs) is constrained by phase transition-induced cracking at the SiO₂ scale. In this study, reactive self-consumption and lattice solid solution strategies are employed to address this limitation via Si–Yb₄Al₂O₉ composite coatings. The formation of an Yb₂Si₂O₇ layer, through the consumption of the thermally grown SiO₂ scale and Yb₄Al₂O₉, reduces the SiO₂ thickness and significantly lowers the cracking driving force. Furthermore, the incorporation of Al into the SiO₂ lattice stabilizes high-temperature β-SiO₂, preventing phase transition-induced cracking. The proposed coating demonstrated an oxidation lifetime 20 times longer than that of pure Si at 1370 °C, highlighting its potential as an EBC bond coating.

Source: Journal of Advanced Ceramics

DOI: 10.26599/jac.2025.9221042

Authors: Lin Chen, Shu-Wen Li, Chang-Jiu Li, Qiang Zhang, Guan-Jun Yang

Institutions: Xi'an Jiaotong University, Beijing Institute of Aeronautical Materials

Language: English

Topic: High-Temperature Coating Behaviors

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,372