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| HIGH-TEMPERATURE OXIDATION RESISTANCE COATINGS ON TiAl ALLOY SURFACE |
| WANG Dongsheng1;2; TIAN Zongjun1;2; CHEN Zhiyong2; SHEN Lida2; WU Hongyan3; ZHANG Pingze3;LIU Zhidong1;2;XU Zhong3; HUANG Yinhui1;2 |
1.Jiangsu Key Laboratory of Precision and Micro--Manufacturing Technology; Nanjing University of Aeronautics and Astronautics; Nanjing 210016
2.College of Mechanical and Electrical Engineering; Nanjing University of Aeronautics and Astronautics; Nanjing 210016
3.School of Materials Science and Technology; Nanjing University of Aeronautics and Astronautics; Nanjing 210016 |
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Abstract The behaviours of double glow plasma surface chromized layers, plasma-sprayed and laser--remelted MCrAlY coatings on the cyclic oxidation resistance of a TiAl alloy were researched in air at 850 ℃. The surface morphology, microstructure and phases of the coatings before and after oxidation were investigated using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), glow discharge spectrometer (GDS) and X-ray diffractometry (XRD). The results show that the chromized layer was uniform, dense and had a well gradient metallurgical bonding with TiAl substrate. The MCrAlY coating prepared by plasma-spraying had a higher porosity and showed lamellar structure, which were eliminated after laser remelting. All the coatings improved the oxidation resistance of TiAl alloy very effectively. The chromized layer showed good oxidation resistance in the early stage of oxidation, while the oxide scale partially peels off in the long--term cyclic oxidation process. The MCrAlY coatings had better oxidation resistance during the long-term cyclic oxidation process. The plasma-spayed MCrAlY coating had better oxidation resistance than the TiAl alloy, and the laser-remelted coating had the best oxidation resistance among the coatings.
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Received: 28 July 2008
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Corresponding Authors:
TIAN Zongjun
E-mail: tianzj@nuaa.edu.cn
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