周琦琛,刘宁,赵沛,张浩宇,张鑫

• 1:江苏科技大学材料科学与工程学院

摘要(Abstract)：

采用激光熔覆技术在H13钢表面成功制备了CoCrFeNi和AlCoCrFeNi中熵合金涂层。利用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)对涂层的微观组织、成分分布和相组成进行分析；在此基础上，重点研究涂层的高温稳态氧化和循环氧化性能，分析涂层的氧化机理。结果表明：激光熔覆CoCrFeNi和AlCoCrFeNi中熵合金涂层与基体之间呈良好的冶金结合，涂层呈现单相FCC结构，其微观组织以柱状晶和等轴晶为主。在700、800和900℃高温氧化60 h后，CoCrFeNi和AlCoCrFeNi涂层的氧化层厚度远小于H13钢的氧化层厚度，抗氧化性能显著优于H13钢。在600℃经历6次循环氧化后，AlCoCrFeNi涂层表面几乎无氧化，CoCrFeNi涂层经历了5次循环后表面形成了极薄的氧化层；600℃循环氧化时虽然H13钢表面氧化层较薄，但结构比较疏松易剥落，对合金内部无法起到保护作用。表明CoCrFeNi和AlCoCrFeNi中熵合金涂层具有优异的高温抗氧化性能。

关键词(KeyWords)： 中熵合金;涂层;激光熔覆;抗氧化性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 周琦琛,刘宁,赵沛,张浩宇,张鑫

DOI: 10.13289/j.issn.1009-6264.2023-0237

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