Abstract
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°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.
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