铝对Zr合金表面TiCrZrNbTa高熵涂层氧化行为的影响

Effect of Al on the Oxidation Behavior of TiCrZrNbTa High-Entropy Coatings on Zr Alloy.

作者信息

Guo Min, Chen Chaoyang, Song Bin, Guo Junhong, Hu Junhua, Cao Guoqin

机构信息

Lonemen Laboratory, Luoyang 471000, China.

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.

出版信息

Materials (Basel). 2025 Apr 28;18(9):1997. doi: 10.3390/ma18091997.

DOI:10.3390/ma18091997

PMID:40363500

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12072472/

Abstract

This study investigates the role of Al alloying in tailoring the oxidation resistance of AlTiCrZrNbTa refractory high-entropy alloy (RHEA) coatings on Zry-4 substrates under high-temperature steam environments. Coatings with varying Al contents (0-25 at.%) were deposited via magnetron sputtering and subjected to oxidation tests at 1000-1100 °C. The results demonstrate that Al content critically governs oxidation kinetics and coating integrity. The optimal performance was achieved at 10 at.% Al, above which a dense, continuous composite oxide layer (AlO, TiO, CrO) formed, effectively suppressing oxygen penetration and maintaining strong interfacial adhesion. Indentation tests confirmed enhanced mechanical integrity in Al-10 coatings, with minimal cracking post-oxidation. Excessive Al alloying (≥17 at.%) led to accelerated coating oxidation. This work establishes a critical Al threshold for balancing oxidation and interfacial bonding, providing a design strategy for developing accident-tolerant fuel cladding coatings.

摘要

本研究调查了在高温蒸汽环境下，铝合金化在调整Zry-4基体上AlTiCrZrNbTa难熔高熵合金（RHEA）涂层抗氧化性方面的作用。通过磁控溅射沉积了具有不同Al含量（0-25原子%）的涂层，并在1000-1100°C下进行了氧化试验。结果表明，Al含量对氧化动力学和涂层完整性起着关键作用。在Al含量为10原子%时达到了最佳性能，高于此含量会形成致密、连续的复合氧化物层（AlO、TiO、CrO），有效抑制氧渗透并保持强界面附着力。压痕试验证实了Al-10涂层的机械完整性增强，氧化后裂纹最少。过量的铝合金化（≥17原子%）导致涂层氧化加速。这项工作确定了平衡氧化和界面结合的关键Al阈值，为开发耐事故燃料包壳涂层提供了一种设计策略。