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    • Microstructure Characteristics and Oxidation Behavior of a Dense Si-Cr-Fe-Ti Coating with a Multi-Layer Structure on Nb-Si Based Alloy by Slurry Sintering

    Weiping Zhang,Yanqiang Qiao,Xiping Guo,Longfei Li,Xi Nan

    CORROSION SCIENCE（2025）

    Northwestern Polytech Univ

    Cited 0|Views9
    Abstract
    A dense and multilayered Si-Cr-Fe-Ti coating was prepared on Nb-Si based alloy by slurry sintering. The oxidation behavior of the coating at 1250, 1350 and 1450 degrees C were systematically investigated. The coating exhibits good oxidation resistance at high temperatures, forming dense and multi-layer scales after oxidation at 1250 degrees C similar to 1350 degrees C, while forming a dense glassy silica scale at 1450 degrees C. The addition of a certain amount of Ti and Fe is beneficial for the formation and stability of the Cr2TiO5 middle layer, thus effectively inhibiting the further oxidation of Cr2O3 to volatile CrO3.
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    Key words
    Nb-Si based alloy,Slurry sintering,Silicide coating,Oxidation
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