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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 Ti0.5Al0.4Si0.1N and Ti0.5Al0.45Si0.05N coatings were very thin and dense, while that on the Ti0.6Al0.3Si0.1N was thicker. The oxide scales formed on the coatings also composed of TiO2 and α-Al2O3. After oxidation the degradation of Ti0.5Al0.4Si0.1N and Ti0.5Al0.45Si0.05N coatings was not apparent, however, the consumption of the Ti0.6Al0.3Si0.1N 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 Ti0.5Al0.4Si0.1N and Ti0.5Al0.45Si0.05N coatings is superior to that of the Ti0.6Al0.3Si0.1N coating, and the application of the Ti0.5Al0.4Si0.1N and Ti0.5Al0.45Si0.05N coatings can significantly improve the oxidation resistance of the γ-TiAl-based alloys at 800 ℃.
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Received: 08 March 2019
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Corresponding Authors:
Peng AI
E-mail: aecc_lm@163.com
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