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CeO2颗粒含量和尺寸对铝化物涂层和基体互扩散行为的影响
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作者单位:

1.上海工程技术大学工程实训中心和材料工程学院;2.上海工程技术大学材料工程学院

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基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目);上海市科委地方院校能力建设项目


Effects of CeO2 contents and particle sizes on the interdiffusion between an aluminide coating and underlying substrate at high temperature
Author:
Affiliation:

1.Engineering Training Center and School of Materials Engineering,Shanghai University of Science and Engineering;2.School of Materials Engineering,Shanghai University of Science and Engineering

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan);Shanghai Municipal Science and Technology Commission local colleges and universities capacity construction project

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    摘要:

    研究发现,在铝化物涂层中添加活性元素(Reactive Element,简称RE),例如钇,铪,锆,铈及其氧化物,可以显著提高涂层的抗氧化性能。本文通过在Ni基体电沉积纳米CeO2颗粒(15-30 nm)含量~0,~1,~2,~3 wt. %和微米CeO2颗粒(5 μm)含量~1 wt. %的Ni-CeO2复合镀层并对其进行部分渗铝,制备了不同CeO2颗粒含量和尺寸掺杂的δ-Ni2Al3/Ni涂层体系。将以上CeO2掺杂的铝化物涂层在1000 °C真空退火不同时间,研究CeO2颗粒含量和尺寸对铝化物涂层和基体互扩散行为的影响。退火结果表明,纳米CeO2颗粒的添加可有效减轻δ-Ni2Al3/Ni涂层体系的退化,而且随着CeO2颗粒含量的增加,其对互扩散的抑制作用明显增强;但微米CeO2颗粒的添加对涂层和基体的互扩散几乎没有影响。这是因为CeO2颗粒含量和尺寸会影响高温过程中铝化物/Ni镀层界面处CeO2富集层的形成,该富集层可作为扩散障,阻碍铝化物涂层和基体的互扩散。

    Abstract:

    The reactive elements (RE), such as Y, Hf, Zr and Ce (or their oxides), are added into the aluminide coatings to improve the oxidation resistance of coatings. In this work, the δ-Ni2Al3/Ni coating systems with different CeO2 contents and particle sizes were specially prepared by partially aluminizing the Ni films containing ~0, ~1, ~2 and ~3 wt. % nanometer CeO2 (15-30 nm) and ~1 wt. % micrometer CeO2 (5 μm), respectively. The effects of CeO2 contents and particle sizes on the interdiffusion of the aluminide coating and underlying substrate were investigated by annealing in vacuum at 1000 °C. The results showed that the addition of nanometer CeO2 in the δ-Ni2Al3/Ni coating system could mitigate the interdiffusion between the aluminide coating and underlying substrate and the blocking effect can be significantly improved with the increase of the CeO2 contents which is 1-3 wt. %. However, the addition of micrometer CeO2 in the coating system had little influence on the degradation of the aluminide coating. This is intrinsically correlated with the fact that the CeO2 contents and particle sizes would influence the formation of the CeO2-rich layer at aluminide/Ni film interface acting as a diffusion barrier between the aluminide coating and substrate.

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谭晓晓,孙丹. CeO2颗粒含量和尺寸对铝化物涂层和基体互扩散行为的影响[J].稀有金属材料与工程,2019,48(8):2480~2487.[Tan Xiaoxiao, Dan Sun. Effects of CeO2 contents and particle sizes on the interdiffusion between an aluminide coating and underlying substrate at high temperature[J]. Rare Metal Materials and Engineering,2019,48(8):2480~2487.]
DOI:10.12442/j. issn.1002-185X.20180728

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历史
  • 收稿日期:2018-07-06
  • 最后修改日期:2018-08-04
  • 录用日期:2018-08-24
  • 在线发布日期: 2019-09-05
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