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

doi:10.3724/SP.J.1077.2013.13091

Journal of Inorganic Materials ›› 2013, Vol. 28 ›› Issue (12): 1369-1375.DOI: 10.3724/SP.J.1077.2013.13091

• Research Paper • Previous Articles Next Articles

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)

Abstract

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

CLC Number:

TQ174

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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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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