High Temperature Oxidation of TiAl/SiC<SUB>p</SUB> Composites Manufactured by MA-SPS Process

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  • Lee D. B.
    Department of Metallurgical Engineering, Sung-Kyun-Kwan University
  • Park J. H.
    Department of Metallurgical Engineering, Sung-Kyun-Kwan University
  • Park Y. H.
    Tohoku National Industrial Research Institute
  • Kim Y. J.
    Department of Metallurgical Engineering, Sung-Kyun-Kwan University

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  • High Temperature Oxidation of TiAl/SiCp Composites Manufactured by MA-SPS Process
  • High Temperature Oxidation of TiAl SiCp

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Abstract

The oxidation behavior of TiAl-containing dispersed particles of (5, 10, 15 mass%) SiC has been studied between 1273 and 1473 K in air. The SiC additions decreased the oxidation rate and exhibited a most pronounced effect for TiAl-10 and 15 mass%SiC composites. The effect of SiC particles is mainly twofold. Firstly, some of the SiC particles reacted with Ti to form Ti–Si compounds, resulting in a decrease in the activity of Ti and, consequently, an increase in the activity of Al in bulk composites. Hence, a thin protective scale mainly composed of a single layer of α-Al2O3 was formed on TiAl/SiCp, contrary to other SiC-free TiAl alloys where relatively thick oxides having multiple layers of TiO2 and α-Al2O3 formed. Secondly, finely distributed unreacted SiC particles promoted fine-grained oxide layer formation by acting as nucleation sites. This increase in nucleation allowed a more rapid formation of α-Al2O3 and, lowered the total weight gain. The new alloy system of TiAl/SiCp composites is considered to be one of the most oxidation-resistant TiAl alloys developed.

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