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Reaction Pathway of Combustion Synthesis of Ti5Si3 in Cu–Ti–Si System

Authors

  • Hui–Yuan Wang,

    1. Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun, China
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  • Si–Jie Lü,

    1. Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun, China
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  • Wei Xiao,

    1. Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun, China
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  • Guo–Jun Liu,

    1. Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun, China
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  • Jin–Guo Wang,

    Corresponding author
    • Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun, China
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  • Qi–Chuan Jiang

    1. Key Laboratory of Automobile Materials of Ministry of Education and School of Materials Science and Engineering, Nanling Campus, Jilin University, Changchun, China
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Author to whom correspondence should be addressed. e-mail: jgwang@jlu.edu.cn

Abstract

The reaction pathway of combustion synthesis (CS) of Ti5Si3 in CuTiSi system was explored through a delicate microstructure and phase analysis on the resultant products during differential thermal analysis (DTA). The formation of CuSi eutectic liquids plays a key role in the reaction pathway, which provides easy route for reactant transfer and accelerates the occurrence of complete reaction. Cu initially reacted with Si to form Cu3Si by a solid-state diffusion reaction, which further reacted with Cu to form CuSi liquids at the eutectic point of ~802°C; then Ti was dissolved into the surrounding CuSi liquids and led to the formation of CuTiSi ternary liquids; finally, Ti5Si3 was precipitated out of the saturated liquids by a solution–reaction–precipitation mechanism. The reaction pathway in CS of titanium silicide (Ti5Si3) could be described briefly as: Cu(s) + Ti(s) + Si(s)Cu3Si(s) + Ti(s) + Si(s)→(CuSi)(l) + Ti(s)→(CuTiSi)(l)Cu(l) + Ti5Si3(s).

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