Abstract
A Cr0.50Al0.50N coating has been prepared by a reactive-magnetron-sputtering method on alloy K38G. The coating possesses mainly the B1 type with a small amount of B4-type crystal structure phase. Isothermal oxidation tests were performed at 900–1,100 °C for 20 h by thermogravimetric analysis (TGA) in air. The results reveal that the coated samples have much lower mass gain than that of the bare alloy. The parabolic rate constants of the coated samples decrease by 2 orders of magnitude compared with the bare alloy at 1,000 and 1,100 °C. During the oxidation of the coated samples below 1,000 °C, the main oxide is Cr2O3, but above 1,000 °C, the scale changes to α-Al2O3. The observed oxidation behaviors demonstrate that the Cr0.50Al0.50N coating can provide good protection against corrosion over a wide temperature range.
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Acknowledgments
This work was supported by the National Outstanding Young Scientist Foundation of China for Y. C. Zhou under grant No. 59925208, Natural Sciences Foundation of China under grant No. 50232040, 50571106, 50072034, 90403027, 863 project, and High-tech Bureau of the Chinese Academy of Sciences.
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Li, T.P., Yin, X.H., Li, M.S. et al. Oxidation Resistance of a Cr0.50Al0.50N Coating Prepared by Magnetron Sputtering on Alloy K38G. Oxid Met 68, 193–210 (2007). https://doi.org/10.1007/s11085-007-9069-7
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DOI: https://doi.org/10.1007/s11085-007-9069-7