温度对TiAl合金表面Si-Al-Y共渗层组织结构的影响

doi:10.11868/j.issn.1001-4381.2014.06.005

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摘要通过在1000，1050，1100℃和1150℃下Si-Al-Y扩散共渗4h的方法，在TiAl合金表面制备了Y改性Si-Al共渗层，采用SEM，EDS和XRD分析了共渗温度对共渗层组织及相组成的影响。结果表明：不同温度所制备的Si-Al-Y共渗层均具有多层复合结构，共渗层的内层都是由TiAl₂和γ-TiAl相组成，互扩散区为富Al的TiAl相，随温度的升高，共渗层外层和中间层的组成相都发生改变。经1000℃/4h共渗的最外层主要为TiAl₃相；温度为1050℃时，由外向内依次为TiSi₂外层，（Ti，X）₅Si₄及（Ti，X）₅Si₃（X表示元素Nb和Cr）中间层；1100℃和1150℃/4h条件下共渗层具有相似的结构，在1100℃/4h条件下其外层由（Ti，X）₅Si₄，（Ti，X）₅Si₃相组成；在1150℃/4h条件下其外层由（Ti，X）₅Si₃相组成。在四种温度条件下，1050℃/4h下制备的共渗层较厚，组织致密，适合用于Si-Al-Y共渗层的制备。

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	李涌泉
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关键词 ： TiAl合金, Si-Al-Y共渗层, 渗层结构

Abstract：Si-Al-Y₂O₃ co-deposition coatings on TiAl alloy were prepared by pack cementation processes at 1000, 1050, 1100℃ and 1150℃ for 4h, scanning electron microscope (SEM), energy dispersive spectrometry (EDS) and X-ray diffraction (XRD) were employed to investigate the surface morphologies, microstructures and phase constitutions of the coatings. The results show that the Si-Al-Y co-deposition coatings have multi layer structure. All the coatings are mainly composed of a TiAl₂ and γ-TiAl inner layer, and an Al rich inter-diffusion zone; the phase constituents of outer layers and middle layers of the coatings change with increasing co-deposition temperatures. The outer layer of the coating prepared at 1000℃ for 4h is composed of TiAl₃. However, the constituent phases change into TiSi₂ in the out layer, and the middle layer is composed of (Ti, X)₅Si₄ and (Ti, X)₅Si₃(X represents Nb and Cr) for coating prepared at 1050℃ for 4h. The coatings prepared at 1100℃ and 1150℃ for 4 h have same layer structure, and (Ti, X)₅Si₄,(Ti, X)₅Si₃ phases are detected in the outer layer of the coating prepared at 1100℃, and (Ti, X)₅Si₃ phases are detected in the outer layer of the coating prepared at 1100℃. In the four kinds of (1000, 1050, 1100℃ and 1150℃) temperatures investigated, the coating prepared at 1050℃ for 4h have a denser and thicker layer, so it is selected for Si-Al-Y co-deposition.

Key words： TiAl alloy Si-Al-Y co-deposition coating coating structure

收稿日期: 2013-04-11 出版日期: 2014-06-20

中图分类号:

TQ174.44

基金资助:陕西省自然科学基础研究计划重点项目（2014JZ012）

通讯作者: 谢发勤（1962- ），男，博士，教授，主要从事材料表面腐蚀与防护研究，联系地址：西北工业大学112信箱（710072），E-mail：fqxie@nwpu.edu.cn E-mail: fqxie@nwpu.edu.cn

作者简介: 李涌泉（1985- ），男，博士研究生，主要从事材料表面腐蚀与防护研究，联系地址：西北工业大学112信箱（710072），E-mail：8386595@163.com

引用本文:

李涌泉, 谢发勤, 吴向清, 姚小飞. 温度对TiAl合金表面Si-Al-Y共渗层组织结构的影响[J]. 材料工程, 2014, 0(6): 22-27.
LI Yong-quan, XIE Fa-qin, WU Xiang-qing, YAO Xiao-fei. Effect of Temperature on Microstructures of Si-Al-Y Co-deposition Coatings on TiAl Alloy. Journal of Materials Engineering, 2014, 0(6): 22-27.

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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2014.06.005 或 http://jme.biam.ac.cn/CN/Y2014/V0/I6/22

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