TiAl合金表面Si-Al-Y共渗层的组织及高温抗氧化性能

doi:10.3724/SP.J.1077.2013.13091

无机材料学报 ›› 2013, Vol. 28 ›› Issue (12): 1369-1375.DOI: 10.3724/SP.J.1077.2013.13091 CSTR: 32189.14.SP.J.1077.2013.13091

TiAl合金表面Si-Al-Y共渗层的组织及高温抗氧化性能

李涌泉¹, 谢发勤¹, 吴向清¹, 李轩^1,2

(西北工业大学 1. 航空学院; 2. 凝固技术国家重点实验室, 西安710072)

收稿日期:2013-02-21 修回日期:2013-03-18 出版日期:2013-12-20 网络出版日期:2013-11-15
作者简介:李涌泉(1985?), 男, 博士研究生. E-mail:8386595@163.com
基金资助:
陕西省科技攻关项目(2011K07-01)

Microstructure and High Temperature Oxidation Resistance of Si-Al-Y Co-deposition Coatings Prepared on TiAl alloy by Pack Cementation Process

LI Yong-Quan¹, XIE Fa-Qin¹, WU Xiang-Qing¹, LI Xuan^1,2

(1. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China; 2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China)

Received:2013-02-21 Revised:2013-03-18 Published:2013-12-20 Online:2013-11-15
About author:LI Yong-Quan. E-mail:8386595@163.com
Supported by:
Science and Technology Program for Research and Development of Shanxi Province(2011K07-01)

摘要/Abstract

摘要： 通过在1050℃下Si-Al-Y扩散共渗0~4 h在TiAl合金表面制备了Al、Y改性的硅化物抗氧化渗层, 分析了共渗层的结构及相组成, 并对其组织形成机理及高温抗氧化性能进行了研究。结果表明: 1050℃共渗4 h所制备的共渗层具有多层结构, 由外向内依次为TiSi₂外层、(Ti,X)₅Si₄及(Ti,X)₅Si₃(X表示Nb, Cr)中间层、TiAl₂和γ-TiAl内层及富Al的过渡层, 其中Y元素主要富集于共渗层的外层和中间层。不同时间共渗的结果表明, Si-Al-Y共渗层的形成是一个在基体表面先沉积Al, 后沉积Si的有序过程。经1000℃高温氧化20 h后共渗层表面形成了由TiO₂外层及SiO₂·Al₂O₃次外层组成的致密氧化膜; Y的氧化物主要存在于氧化膜与残余共渗层的界面处, 能够有效地增强膜层的附着力。

关键词: TiAl合金, Si-Al-Y共渗层, 组织形成, 平衡气相分压, 高温抗氧化性能

Abstract: In order to improve the oxidation resistance of TiAl alloy, Al and Y modified silicide coating were prepared by pack cementation process at 1050℃ for 0-4 h. The formative mechanism and oxidation behavior of the coating were studied. The results show that the coating prepared by co-depositing Si-Al-Y at 1050℃ for 4 h has a multiple layer structure: an outer layer composed of TiSi₂, a middle layer composed of (Ti,X)₅Si₄ and (Ti,X)₅Si₃ (X represents Nb and Cr elements), an inner layer composed of TiAl₂, γ-TiAl phases and a Al-rich inter-diffusion zone. Y mainly existed in the outer layer and middle layer of the coating. The coating formation process followed a sequent deposition mechanism, with Al deposited at the initial stage and Si deposited at the later stage. After oxidation at 1000℃ for 20 h, a dense scale composed of a thin TiO₂ outer layer and a thick SiO₂·Al₂O₃ inner layer is formed on the co-deposition coating. During the oxidation process, the excessive Y₂O₃ particles form in the interface of the scale and the substrate, which might promote the adherence of the scale effectively.

Key words: TiAl alloy, Si-Al-Y co-deposition, structural formation, equilibrium partial pressure, high temperature oxidation resistance

中图分类号:

TQ174

李涌泉, 谢发勤, 吴向清, 李轩. TiAl合金表面Si-Al-Y共渗层的组织及高温抗氧化性能[J]. 无机材料学报, 2013, 28(12): 1369-1375.

LI Yong-Quan, XIE Fa-Qin, WU Xiang-Qing, LI Xuan. Microstructure and High Temperature Oxidation Resistance of Si-Al-Y Co-deposition Coatings Prepared on TiAl alloy by Pack Cementation Process[J]. Journal of Inorganic Materials, 2013, 28(12): 1369-1375.

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TiAl合金表面Si-Al-Y共渗层的组织及高温抗氧化性能

Microstructure and High Temperature Oxidation Resistance of Si-Al-Y Co-deposition Coatings Prepared on TiAl alloy by Pack Cementation Process

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