Mechanism of Self-Propagating High-Temperature Synthesis of MoSi₂

Abstract:

The reaction mechanism of self-propagating high-temperature synthesis of MoSi₂ was investigated by means various methods. The result of activation energy calculation indicates that the synthesis reaction is controlled by a single mechanism. Analysis on the microstructure of Mo/MoSi₂ and Si/MoSi₂ interfaces reveals that Mo reacts with Si to directly form MoSi₂ without any transient product (s). Morphology comparison between the reactants and the product demonstrates that the reaction mechanism is not reactive diffusion. Microstructural observation on the materials from quenched zone shows MoSi₂ particles precipitate from liquid phase. A mechanism may be proposed based on the above results: Mo particles are covered by molten Si and dissolve into the melt, and then MoSi₂ particles precipitate from the melt due to super saturation.

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 587-593
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.587
• Online since: February 2013
• Authors: Jian Ying Gao, Lian Jun Wang, Wan Jiang
• Keywords: Activation Energy, Interface, Morpholoy, Quenching, Reaction Mechanism

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