铬含量对FeCoCr<sub>x</sub>NiB高熵合金涂层氧化行为的影响

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引用本文:	张冲，黄标，戴品强.铬含量对FeCoCr_xNiB高熵合金涂层氧化行为的影响[J].中国表面工程,2016,29(1):32~38
	ZHANG Chong, HUANG Biao, DAI Pinqiang.Effects of Chromium Content on Oxidation Behavior of FeCoCr_xNiB High-entropy Alloy Coatings[J].China Surface Engineering,2016,29(1):32~38

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铬含量对FeCoCr_xNiB高熵合金涂层氧化行为的影响
张冲，黄标，戴品强^1,2,3
1. 福州大学材料科学与工程学院, 福州 350108;2. 福建省特种设备检验研究院, 福州 350008;3. 福建工程学院材料科学与工程学院，福州 350108

摘要:

在45钢基体上用激光熔覆方法制备FeCoCrxNiB（x=0.5～3）高熵合金涂层。不同Cr含量(原子数分数)的FeCoCrxNiB高熵合金涂层在900 ℃下进行高温氧化实验，测定其氧化动力曲线，并采用XRD、SEM和EDS等方法分析氧化层结构和形貌。结果表明，不同Cr含量的FeCoCrxNiB涂层氧化动力学曲线基本都符合抛物线规律。随着Cr含量的增加，FeCoCrxNiB涂层的氧化膜由富Fe的氧化物逐渐向富Cr氧化物转变，并最终生成稳定、连续的Cr2O3氧化膜。富Fe的氧化物表面形貌为针状且较为疏松，而富Cr的氧化物则为较为致密颗粒状。涂层的抗氧化性能随Cr含量的增加而增强。当Cr含量超过x=2后，FeCoCrxNiB涂层获得了较好的抗氧化性能。

关键词: 高熵合金涂层激光熔覆氧化铬

DOI：10.11933/j.issn.1007-9289.2016.01.005

分类号:

基金项目:

Effects of Chromium Content on Oxidation Behavior of FeCoCr_xNiB High-entropy Alloy Coatings

ZHANG Chong, HUANG Biao, DAI Pinqiang^1,2,3

1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108;2. Fujian Special Equipment Inspection and Research Institute, Fuzhou 350008;3. Department of Materials Science and Engineering, College of Fujian University of Technology, Fuzhou 350108

Abstract:

FeCoCrxNiB （x=0.53） highentropy alloy coatings were prepared by laser cladding on 45 steel. The oxidation experiments of the FeCoCrxNiB highentropy alloy coating with different Cr ontent were performed at temperature of 900 ℃, and the corresponding oxidation kinetics curves were tested. The structure and morphology of the oxide layer were studied by adopting the analytical methods, such as XRD, SEM, and EDS. The results show that FeCoCrxNiB coatings obey the parabolic law. With increasing Cr content, the oxide film of the FeCoCrxNiB coatings gradually changes from Ferich oxide to Crrich oxide, and finally generates a stable and continuous film of Cr2O3. The surface morphology of the Ferich oxide film is needlelike and loose, while the Crrich oxide film is granularlike and dense. The oxidation resistance of the FeCoCrxNiB coatings is improved with increasing of Cr content. When the content of Cr is more than x=2, better antioxidant properties of the FeCoCrxNiB coatings obtained.

Key words: high-entropy alloy coating laser cladding oxidation chromium(Cr)