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Combustion synthesis of MoSi2-Mo5Si3 composites

Published online by Cambridge University Press:  03 March 2011

J. Subrahmanyam
J. Subrahmanyam
Affiliation:
Combustion Synthesis Group, Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad-500258, India
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Abstract

Thermochemical calculations were carried out for the Self-propagating High-temperature Synthesis (SHS) of MoSi2, Mo5Si3, 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 MoSi2 and the MoSi2-Mo5Si3 composite and the finer morphology of Mo5Si3 can be explained in terms of the presence of transient liquid phase at the adiabatic temperature. The morphology of fracture surface of MoSi2 shows intergranular fracture, while Mo5Si3 and the MoSi2-Mo5Si3 composite show transgranular cleavage fracture.

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Articles
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Journal of Materials Research , Volume 9 , Issue 10 , October 1994 , pp. 2620 - 2626
Copyright
Copyright © Materials Research Society 1994

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