镍基单晶高温合金N5及其纳米晶涂层在900 ℃下O2和O2+20%H2O气氛中的氧化行为

doi:10.11902/1005.4537.2022.040

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 55-61 CSTR: 32134.14.1005.4537.2022.040 DOI: 10.11902/1005.4537.2022.040

研究报告

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镍基单晶高温合金N5及其纳米晶涂层在900 ℃下O₂和O₂+20%H₂O气氛中的氧化行为

杨依凡, 孙文瑶(

), 陈明辉(

), 王金龙, 王福会

东北大学沈阳材料科学国家研究中心东北大学联合分部沈阳 110819

Oxidation Behavior of a Single Crystal Ni-based Superalloy N5 and Its Nanocrystalline Coating at 900 ℃ in O₂ and O₂+20%H₂O Environment

YANG Yifan, SUN Wenyao(

), CHEN Minghui(

), WANG Jinlong, WANG Fuhui

Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China

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摘要:

以镍基单晶高温合金N5为基体，采用磁控溅射技术在基体表面沉积与其成分相同的纳米晶涂层，并对比研究合金及其纳米晶涂层在900 ℃下O₂和O₂+20% (体积分数) H₂O气氛中的氧化行为。结果表明，水蒸气加快了合金和涂层的氧化速率，促进合金表面氧化膜的剥落，并且影响了氧化膜的组成和结构。在O₂和O₂+H₂O环境中，合金表面氧化膜都由外层NiO、中间层NiAl₂O₄和内层Al₂O₃组成；但在O₂+H₂O环境中，合金氧化速率较大，外层氧化膜发生剥落。纳米晶涂层显著提高了合金的抗高温氧化性能，在O₂气氛中表面形成Al₂O₃，而在O₂+H₂O气氛中表面氧化膜主要为NiAl₂O₄。同时，纳米晶涂层表面氧化膜未发生开裂和剥落，起到良好的保护作用。

关键词 ：镍基单晶高温合金, 纳米晶涂层, 高温氧化, 水蒸气, 磁控溅射

Abstract：

The nanocrystalline coatings of superalloy N5 were deposited on the surface of nickel-based single-crystal superalloy N5 by magnetron sputtering. The oxidation behavior of the single-crystal alloy and its nanocrystalline coating in environments of O₂ and O₂+20%H₂O at 900 ℃ was investigated, respectively. The results show that the water vapor accelerates the oxidation rate of the bare alloy and the coating, while promotes very specially the spallation, and affects the composition and structure of the oxide scales formed on the bare alloy. Correspondingly, the formed oxide scales composed of an outer layer NiO, a middle layer NiAl₂O₄ and an inner layer Al₂O₃ for the bare alloy being oxidized in environments of O₂ and O₂+H₂O respectively, meanwhile, the oxidation rate is higher, and the spallation of outer oxide scale dose emerge for the oxidation in O₂+H₂O environment. The nanocrystalline coating significantly can enhance the high temperature oxidation resistance of the coated alloy. After oxidation in O₂, Al₂O₃ is formed on the surface of the coating, while in O₂+H₂O environment, the formed oxide scale is NiAl₂O₄. Meanwhile, no cracks and spalling were found on the surface of oxide scale, which played a good protective role.

Key words： Ni-based single-crystal superalloy nanocrystalline coatings high-temperature oxidation water vapor magnetron sputtering

收稿日期: 2022-02-14 32134.14.1005.4537.2022.040

ZTFLH:

TG172.3

基金资助:国家自然科学基金(51871051);工业和信息技术部项目(MJ-2017-J-99)

作者简介: 杨依凡，女，1997年生，硕士生

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引用本文:

杨依凡, 孙文瑶, 陈明辉, 王金龙, 王福会. 镍基单晶高温合金N5及其纳米晶涂层在900 ℃下O₂和O₂+20%H₂O气氛中的氧化行为[J]. 中国腐蚀与防护学报, 2023, 43(1): 55-61.
Yifan YANG, Wenyao SUN, Minghui CHEN, Jinlong WANG, Fuhui WANG. Oxidation Behavior of a Single Crystal Ni-based Superalloy N5 and Its Nanocrystalline Coating at 900 ℃ in O₂ and O₂+20%H₂O Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 55-61.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.040 或 https://www.jcscp.org/CN/Y2023/V43/I1/55

图1 合金经FeCl3溶液刻蚀后的表面背散射形貌和面扫图

图2 溅射纳米晶涂层的表面和截面形貌

图3 N5及其纳米晶涂层在900 ℃下O2和O2+H2O气氛中氧化100 h的动力学曲线

图4 N5及其纳米晶涂层在900 ℃下O2和O2+H2O气氛中氧化100 h后表面的X射线衍射图谱

图5 N5合金在900 ℃下O2中氧化100 h后的表面微观形貌及EDS分析

图6 N5合金在900 ℃ O2+H2O气氛中氧化100 h后的表面微观形貌及EDS分析

图7 N5合金在900 ℃下O2和O2+H2O气氛中氧化100 h后的截面微观形貌图

表1 图7中1~7点EDS分析

图8 纳米晶涂层在900 ℃下O2和O2+H2O气氛中氧化100 h后的表面和界面形貌图

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