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Effects of Nanometer Al2O3 Particles on Oxidation Behaviors of Laser Cladding Low Al NiCoCrAlY Coatings

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Abstract

Different contents of nanometer Al2O3 particles (nano-Al2O3p) were added into laser cladding low Al NiCoCrAlY coatings to improve the oxidation resistance. The isothermal oxidation behavior of the coatings in air for 100 h at 1050 °C were investigated, and the effects and influencing mechanisms of nano-Al2O3p were discussed. The results showed that oxidation resistances of the nano-Al2O3p-added coatings are clearly better than that of the nano-Al2O3p-free one. The coating with 1 wt% nano-Al2O3p added showed the best performance. Its weight gain was 1.72 mg/cm2 after 100 h oxidation, which was only half the weight gain of the nano-Al2O3p-free coating. The duration required to reach the steady oxidation was only 1/20 that of the nano-Al2O3p-free coating, while the duration of the steady stage was 5 times longer than that of the nano-Al2O3p-free coating. With the addition of nano-Al2O3p, the oxidation resistance was improved by acceleration of Cr selective oxidation, inhibition of volatilization of Cr2O3 scales, improvement of oxide scale self-repairing capability, and blocking of micro channels for oxygen penetrating inwards. In particular, it was inferred that this blocking also has a significant effect on enhancing the oxidation resistance of other high temperature protective coatings such as non-volatile oxide scales.

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Acknowledgements

This study was sponsored by the Doctoral Program of Higher Education (Grant No. 20060287019), the Opening Research Fund of Jiangsu Key Laboratory of Tribology (Grant No. kjsmcx07001) and Graduate Innovation Foundation of Jiangsu Province (Grant No. CX08B-039Z). The authors are grateful to Dr. Kui Liu from the National University of Singapore for assistance with revisions in English.

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Authors and Affiliations

  1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Hongyu Wang, Dunwen Zuo, Jing Yan, Mingmin Huang & Xiangfeng Li

  2. School of Mechanical Engineering, Jiangsu University, Zhenjiang, 212013, People’s Republic of China

    Hongyu Wang

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  1. Hongyu Wang
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  2. Dunwen Zuo
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  3. Jing Yan
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  4. Mingmin Huang
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  5. Xiangfeng Li
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Correspondence to Dunwen Zuo.

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Wang, H., Zuo, D., Yan, J. et al. Effects of Nanometer Al2O3 Particles on Oxidation Behaviors of Laser Cladding Low Al NiCoCrAlY Coatings. Oxid Met 74, 49–60 (2010). https://doi.org/10.1007/s11085-010-9197-3

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  • DOI: https://doi.org/10.1007/s11085-010-9197-3

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