Influence of TiAlSiN Coatings on High Temperature Oxidation Resistance of γ-TiAl Based Alloys

doi:10.11902/1005.4537.2019.028

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (4): 306-312 DOI: 10.11902/1005.4537.2019.028

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Influence of TiAlSiN Coatings on High Temperature Oxidation Resistance of γ-TiAl Based Alloys

AI Peng(

),LIU Lixiang,LI Xiaogang,JIANG Wentao

AECC Shenyang Liming Aero Engine Co. , Ltd. , Shenyang 110043, China

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Abstract

In order to improve high temperature oxidation resistance of γ-TiAl based alloys, TiAlSiN coatings were deposited on two alloys of Ti-46Al-2.5V-1Cr-0.3Ni and Ti-48Al-2Cr-2Nb using arc ion plating, while the cyclic oxidation behavior at 800 ℃ was comparatively assessed for the bare and coated alloys. The tested samples were characterized by means of scanning electron microscopy (SEM) with energy-dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). After cyclic oxidation at 800 ℃ for 300 h, the formed oxide scales composed of TiO₂ and α-Al₂O₃ on the bare Ti-48Al-2Cr-2Nb and Ti-46Al-2.5V-1Cr-0.3Ni alloys. The oxide scale formed on the Ti-46Al-2.5V-1Cr-0.3Ni alloy was very thick and spalled seriously, and that on the Ti-48Al-2Cr-2Nb alloy was thinner and spalled slightly. Application of the TiAlSiN coatings with different Al and Si content significantly decreased the oxidation rate of the bare alloy. After oxidation at 800 ℃ for 300 h, the oxide scales formed the Ti_0.5Al_0.4Si_0.1N and Ti_0.5Al_0.45Si_0.05N coatings were very thin and dense, while that on the Ti_0.6Al_0.3Si_0.1N was thicker. The oxide scales formed on the coatings also composed of TiO₂ and α-Al₂O₃. After oxidation the degradation of Ti_0.5Al_0.4Si_0.1N and Ti_0.5Al_0.45Si_0.05N coatings was not apparent, however, the consumption of the Ti_0.6Al_0.3Si_0.1N coating was obvious. Interdiffusion between the coatings and the γ-TiAl based alloys was very limited. So it can be concluded that the oxidation resistance of the Ti_0.5Al_0.4Si_0.1N and Ti_0.5Al_0.45Si_0.05N coatings is superior to that of the Ti_0.6Al_0.3Si_0.1N coating, and the application of the Ti_0.5Al_0.4Si_0.1N and Ti_0.5Al_0.45Si_0.05N coatings can significantly improve the oxidation resistance of the γ-TiAl-based alloys at 800 ℃.

Key words: γ-TiAl-based alloy TiAlSiN coating high temperature oxidation resistance ion plating interdiffusion

Received: 08 March 2019

ZTFLH:

TG174

Corresponding Authors: Peng AI E-mail: aecc_lm@163.com

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Cite this article:

AI Peng,LIU Lixiang,LI Xiaogang,JIANG Wentao. Influence of TiAlSiN Coatings on High Temperature Oxidation Resistance of γ-TiAl Based Alloys. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 306-312.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.028 OR https://www.jcscp.org/EN/Y2019/V39/I4/306

Fig.1 Surface (a) and cross-sectional (b) morphologies of as-deposited Ti_0.5Al_0.4Si_0.1N coating

Fig.2 XRD patterns of three as-deposited TiAlSiN coatings (a: Ti_0.6Al_0.3Si_0.1N, b: Ti_0.5Al_0.45Si_0.05N, c: Ti_0.5Al_0.4Si_0.1N)

Table 1 Chemical compositions of as-deposited coatings by EDS (atomic fraction / %)

Fig.3 Cyclic oxidation kinetics of TiAlSiN coatings at 800 ℃ in air

Fig.4 Surface (a, c, e) and cross-sectional (b, d, f) morphologies of Ti_0.5Al_0.45Si_0.05N (a, b), Ti_0.5Al_0.4Si_0.1N (c, d) and Ti_0.6Al_0.3Si_0.1N (e, f) coatings after cyclic oxidation at 800 ℃ for 300 h

Fig.5 XRD spectra of Ti_0.5Al_0.45Si_0.05N (a), Ti_0.5Al_0.4Si_0.1N (b) and Ti_0.6Al_0.3Si_0.1N (c) coatings after cyclic oxidation at 800 ℃ for 300 h

Fig.6 Cyclic oxidation kinetics of bare and coated Ti-46Al-2.5V-1Cr-0.3Ni and Ti-48Al-2Cr-2Nb alloys at 800 ℃

Fig.7 Surface (a, c) and cross-sectional (b, d) morphologies of Ti-46Al-2.5V-1Cr-0.3Ni (a, b) and Ti-48Al-2Cr-2Nb (c, d) alloys after cyclic oxidation at 800 ℃ for 300 h

Fig.8 XRD patterns of Ti-46Al-2.5V-1Cr-0.3Ni (a) and Ti-48Al-2Cr-2Nb (b) alloys after cyclic oxidation at 800 ℃ for 300 h

Fig.9 Surface (a) and cross-sectional (b) morphologies of Ti-46Al-2.5V-1Cr-0.3Ni alloy coated with Ti_0.5Al_0.4Si_0.1N coating after cyclic oxidation at 800 ℃ for 300 h

Table 2 EDS analysis results of the points marked in Fig.9b (atomic fraction / %)

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