Combustion synthesis of MoSi_2-Mo_5Si_3 composites

Thermochemical calculations were carried out for the Self-propagating High-temperature Synthesis (SHS) of MoSi 2 , Mo 5 Si 3 , and their composites. Adiabatic temperatures and the amounts of liquid phases formed at the adiabatic temperature were calculated for different initial temperatures. These materials were prepared from elemental powders of Mo and Si by the thermal explosion mode of SHS. The products were characterized by x-ray diffraction, scanning electron microscopy, and microhardness. The larger particle morphology of MoSi 2 and the MoSi 2 -Mo 5 Si 3 composite and the finer morphology of Mo 5 Si 3 can be explained in terms of the presence of transient liquid phase at the adiabatic temperature. The morphology of fracture surface of MoSi 2 shows intergranular fracture, while Mo 5 Si 3 and the MoSi 2 -Mo 5 Si 3 composite show transgranular cleavage fracture.

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