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| Isothermal Oxidation Behaviour of Ni–Cr–Ta–Al–Co–Mo Alloy at 900oC and 1000oC |
| LU Xudong1,2, TIAN Sugui2, YU Xingfu2, WANG Changxin1 |
1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110178
2.Equipment Engineering College, Shenyang Ligong University, Shenyang 110159 |
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Cite this article:
LU Xudong TIAN Sugui YU Xingfu WANG Changxin. Isothermal Oxidation Behaviour of Ni–Cr–Ta–Al–Co–Mo Alloy at 900oC and 1000oC. Chin J Mater Res, 2011, 25(4): 427-432.
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Abstract Abstract: By means of measuring the kinetics curves of the oxidation and analysis method of TGA, XRD and SEM/EDAX. An investigation has been made into the oxidation behaviour of a nickel-based superalloy at 900℃ and 1000℃ in air. Results show that the kinetics curves of the alloy oxidizing obey the parabola regularity, and the rate of the mass gaining decrease gradually as the oxidizing time prolongs, and the oxidizing process is mainly controlled by the formation of Cr2O3 and Al2O3 phases. After oxidized at 900℃ and 1000℃, the oxide scales in the alloy consists of three layers, including the outer, middle and internal oxidizing layers, Cr2O3 and a few (Ni,Co)Cr2O4 phases are included in the outer oxide layer, the intermediate layer consists of CrTaO4 phase, and the internal oxide layer is identified as Al2O3 phase. In the period of the alloy oxidizing, the phase containing Ta-richer may restrain the element Al in the matrix diffusing outward, which restrains the growth up of the oxide scales to decrease the oxidizing rate of the alloy.
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Received: 03 June 2010
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| Fund: Supported by National Natural Science Foundation of China No.50571070. |
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