Field-activated pressure-assisted combustion synthesis of MoSi₂

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• 作者：J. -Y. Gao (1) jianying.g@gmail.com
  W. Jiang (1)
• 关键词：intermetallics ; combustion synthesis ; simultaneous synthesis and densification ; transition phase layer ; dissolution and precipitation
• 刊名：International Journal of Self-Propagating High-Temperature Synthesis
• 出版时间：September 2008
• 出版年：2008
• 期刊代码：pc344_1061-3862
• 类别：ch
• 卷：17
• 期：3
• 页码：195-198
• 数据来源：sp

摘要

The simultaneous synthesis and densification of MoSi₂ starting from elemental Mo and Si was carried out through a process of field-activated pressure-assisted combustion synthesis (FAPACS). After heating up to 922掳C, the synthesis reaction occurs in the mode of thermal explosion but is ceased subsequently due to a sudden shock. The product consists of MoSi₂, residual Mo and amorphous Si with precipitation of very small MoSi₂ primary crystals containing. There is no transition phase layer between Mo and MoSi₂ as well as Si and MoSi₂. This indicates that metallic Mo reacts with molten Si directly forming MoSi₂ in the FAPACS process, without any intermediate reaction steps involved. The formation of MoSi₂ occurs via dissolution of Mo into Si melt followed by MoSi₂ precipitation from the melt.