Extreme Materials

Screening of CMAS corrosion-resistant RE2SiO5 for environmental barrier coating application by a high-throughput multilayer stacking method

Liya Zheng, Keyu Ming, Zhilin Tian

High-temperature corrosion caused by low-melting-point molten salts known as CMAS poses a critical challenge to hot-section components in gas turbine engines. The screening of CMAS corrosion-resistant RE2SiO5 ceramics is crucial for the development of environmental barrier coatings for SiC fiber reinforced SiC composites. Due to varying experimental methods, conditions, and CMAS corrosion evaluation approaches, there has been some controversy regarding the CMAS resistance of RE2SiO5 ceramics. To address this issue, we employed a highthroughput multilayer stacking method to eliminate external influences such as experimental conditions. The CMAS resistance of several rare earth silicate ceramics was investigated, which revealed the influence of rare earth elements on CMAS corrosion. It was found that the smaller the rare earth ionic radius, the less corrosion product formed. Additionally, Er2SiO5 exhibited the best CMAS resistance due to the shallowest penetration depth of CMAS. The results indicate that the evaluation of CMAS corrosion resistance of RE2SiO5 ceramics requires a comprehensive consideration of the formation ability of corrosion products, dissolution of RE2SiO5, and the penetration of CMAS.

Key Materials for Extreme High-Temperature Environments: Ultra-High-Temperature Ceramics and Their Composites

Yuxuan Liu, Hui Wang, Jianchao Hao, Yuan Cheng, Shun Dong, Ping Hu, Wenbo Han, Xinghong Zhang

With the advancement of hypersonic vehicles, extreme high temperature environments have imposed increasingly stringent requirements on the performance of thermal protection systems. Consequently, the development of high-performance thermal protection materials capable of withstanding extreme conditions has become a primary focus of current research. Ultra-high temperature ceramics (UHTCs) and their composites, known for their excellent oxidation resistance and ablation performance, are regarded as highly promising non-ablative thermal protection materials. This paper provides a systematic review of recent research progress on UHTC composites in several key areas, including innovations and optimizations in fabrication processes, exploration of toughening strategies and mechanisms, in-depth studies on oxidation and ablation resistance mechanisms, and the development and potential applications of high-entropy ceramics. Furthermore, the paper discusses the practical application prospects of UHTCs and their composites in extreme environments, analyzes the current technical challenges, and proposes future research directions and priorities.

Progress in the degradation of thermal and environmental barrier coating materials caused by calcium-magnesium-aluminum-silicate deposit

Zhilin Chen, Xingwang Lai, Yuting Liang, Lingxi Qu, Zhilin Tian, Bin Li

Thermal and environmental barrier coatings play a crucial role in protecting high-temperature structural components in gas turbine engines. As turbine inlet temperatures continue to rise, corrosion challenges posed by dust, volcanic ash, and other particulate matter—collectively known as CMAS—have become increasingly severe. Understanding the reaction mechanisms between CMAS and these coatings, identifying the key factors influencing CMAS corrosion, and developing methods to inhibit CMAS infiltration are essential for advancing high-performance gas turbine engines. This review examines the origins of CMAS corrosion and summarizes recent research on CMAS corrosion mechanisms in thermal and environmental barrier coating materials. Additionally, the role of rare earth elements in CMAS corrosion and various strategies to mitigate CMAS effects are discussed. Finally, the review highlights potential directions for future research.

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Open Access | ISSN 3050-628X

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Editor-in-chief: Prof. Yanchun Zhou
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The Extreme Materials is an international journal focusing on materials under extreme conditions or having extreme properties. It publishes innovative original academic research articles and high-level review articles in the field of materials science. All submissions will be peer reviewed and published via Open Access if accepted. This journal aims to:
● Build a communication platform for scientific researchers engaged in special materials
● Report breakthroughs in the field of materials science
● Reflect the latest academic trends in this field
● Lead the hot topics of disciplines
● Promote academic exchanges
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Screening of CMAS corrosion-resistant RE2SiO5 for environmental barrier coating application by a high-throughput multilayer stacking method

Key Materials for Extreme High-Temperature Environments: Ultra-High-Temperature Ceramics and Their Composites

Progress in the degradation of thermal and environmental barrier coating materials caused by calcium-magnesium-aluminum-silicate deposit

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