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EFFECT OFLa2O3ON HIGH-TEMPERATURE OXIDATION RESISTANCE OF ELECTROSPARK DEPOSITEDNi-BASED COATINGS

Author

Listed:
  • YUXIN GAO

    (School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China)

  • JIAN YI

    (School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China)

  • ZHIGANG FANG

    (School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China)

  • HU CHENG

    (School of Mechanical Engineering, Taizhou University, Taizhou 318000, P. R. China)

Abstract

The oxidation tests of electrospark depositedNi-based coatings without and with 2.5 wt.%La2O3were conducted at 960°C in air for 100 h. The oxidation kinetic of the coatings was studied by testing the weight gain. The phase structures and morphologies of the oxidized coatings were investigated by XRD and SEM. The experimental results show that the coatings with 2.5 wt.%La2O3exhibits excellent high-temperature oxidation resistance including low oxidation rate and improved spallation resistance, due to the formation of a denser and more adherent oxide scale compared with that withoutLa2O3. The effects ofLa2O3on the oxidation resistance include the following two aspects: First, refinement of the coating grains promotes the selective oxidation ofCr, leading to the formation of protective chromia scale in a short time, and second, refinement of the oxide grains enhances the high-temperature creep rate, resulting in decrease of inner stress and improvement of spallation resistance of the oxide layer.

Suggested Citation

  • Yuxin Gao & Jian Yi & Zhigang Fang & Hu Cheng, 2014. "EFFECT OFLa2O3ON HIGH-TEMPERATURE OXIDATION RESISTANCE OF ELECTROSPARK DEPOSITEDNi-BASED COATINGS," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 21(05), pages 1-8.
    • Handle: RePEc:wsi:srlxxx:v:21:y:2014:i:05:n:s0218625x14500711
    DOI: 10.1142/S0218625X14500711
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    Keywords

    High-temperature oxidation; La2O3; Ni-based coatings;
    All these keywords.

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