DZ125合金再涂覆CoCrAlY涂层界面互扩散行为研究

秦磊; 彭徽; 郭洪波; 宫声凯; 徐惠彬

doi:10.3724/SP.J.1037.2012.00532

金属学报 >

2013 , Vol. 49 >Issue 2: 229 - 235

DOI: https://doi.org/10.3724/SP.J.1037.2012.00532

论文

DZ125合金再涂覆CoCrAlY涂层界面互扩散行为研究

秦磊 ,
彭徽 ,
郭洪波 ,
宫声凯 ,
徐惠彬

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北京航空航天大学材料科学与工程学院, 北京 100191

秦磊, 男, 1986年生, 硕士生

收稿日期: 2012-09-11

修回日期: 2012-11-13

网络出版日期: 2013-02-11

基金资助

国家自然科学基金项目51071013和国家重点基础研究发展计划

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INTER-DIFFUSION BEHAVIOR OF RECOATED CoCrAlY COATING/DZ125 DIRECTIONALLY SOLIDIFIED SUPERALLOY

QIN Lei ,
PENG Hui ,
GUO Hongbo ,
GONG Shengkai ,
XU Huibin

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School of Materials Science and Engineering, Beihang Unviersity, Beijing 100191

Received date: 2012-09-11

Revised date: 2012-11-13

Online published: 2013-02-11

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摘要

采用电子束物理气相沉积(EB-PVD)方法在DZ125镍基高温合金上制备了CoCrAlY涂层, 经过高温氧化扩散处理后, 通过物理方法去除不同深度的涂层, 采用相同的工艺重新制备了CoCrAlY涂层. 研究了高温扩散过程中再涂覆CoCrAlY涂层与DZ125合金基体界面的互扩散行为及涂层的高温氧化行为. 结果表明, 去除涂层的深度对再涂覆涂层与合金界面的扩散行为以及涂层的高温氧化性能有重要影响. 再涂覆涂层经高温氧化后形成的贫Al区厚度均小于首次涂覆涂层, 且去除的深度越浅, 贫Al区的厚度越薄.当涂层去除至互扩散区(IDZ)底部时, 再涂覆涂层经高温氧化后形成的IDZ厚度与首次涂覆涂层相当, 且氧化膜厚度较薄.

关键词： DZ125合金; 再涂覆; CoCrAlY涂层; 互扩散

本文引用格式

秦磊 , 彭徽 , 郭洪波 , 宫声凯 , 徐惠彬 . DZ125合金再涂覆CoCrAlY涂层界面互扩散行为研究[J]. 金属学报, 2013 , 49(2) : 229 -235 . DOI: 10.3724/SP.J.1037.2012.00532

Abstract

The thermal barrier coatings (TBCs) are widely used in gas turbines which could lower the surface operating temperature and improve the service life of the coated part component. When repair or refurbishment of these coated components, it is necessary to remove the coating and replace it with a new coatings. The CoCrAlY coatings were deposited by EB-PVD on the directionally solidified nickel-based superalloy DZ125. The coatings were removed via physical methods in varying thicknesses and recoated subsequently. The results showed that the depth of the removal had a significant impact on the inter-diffusion behavior as well as the oxidation resistance. The thickness of Al-depleted zone formed in the recoated coatings after oxidation are thinner than the first coated coatings. Moreover, the more the coating was removed, the thinner the Al-depleted zone was formed. The recoated coatings deposited on the substrate removed the entirely inter-diffusion zone (IDZ) showed the best oxidation resistance, and the IDZ formed after oxidation was similar to the first coated coatings.

Key words： DZ125 alloy; recoate; CoCrAlY coating; inter-diffusion

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