Contact
    Start Publications Comparison of oxidation resistance behavior between Y3+ and ...
    ←  Publication Finder
    Attension

    Comparison of oxidation resistance behavior between Y3+ and Zr4+ modified aluminum phosphate impregnated graphite

    Year: 2021

    Journal: Surf. Coat. Technol., Volume 423, OCT 15

    Authors: Xu, Yang; Li, Zhuan; Chen, Fu; Chen, Zhuo; Tang, Hui-xian; Zhao, Jiong; Zhao, Yi-bo; Xiao, Peng

    Organizations: National Natural Science Foundation of China [52075555]; National Key Research and Development Program of China [2020YFB2008203]; Special Funds for the Construction of Innovative Provinces of Hunan Province [2020GK2063]; Natural Science Foundation of Hunan Province [2020JJ2682]; Graduate Research and Innovation Project of Central South University [1053320211575]; State Key Laboratory of Powder Metallurgy

    Keywords: Graphite; Impregnation; Phosphate coating; Oxidation resistance

    To provide an oxidation protection system for graphite at low and medium temperatures (<1000 degrees C), aluminum metaphosphate (Al(PO3)(3)) coating was prepared on graphite surface by solution impregnation technology. Y3+ and Zr4+ were added respectively to improve the oxidation resistance of the coating, and the optimum additive amount of them was explored. The results indicate that the addition of Y3+ and Zr4+ can further inhibit the volatilization of P2O5. Furthermore, the Y3+ can improve the wettability of the aluminum phosphate impregnation solution on graphite surface, and the oxidation resistance of the modified coating is better below 800 degrees C; the Zr4+ can reduce the coefficient of thermal expansion of the aluminum phosphate coating, which shows better oxidation resistance above 800 degrees C. The impregnation solution modified by Y3+ diffuses into the graphite, and the surface coating plays the role of antioxidants together with the graphite matrix. While the Zr4+ modified impregnation solution mainly forms a coating on the graphite surface, and the coating plays the major antioxidation effect.
    View publication