Abstract
Molybdenum disilicide was synthesized from elemental reactants in argon and vacuum atmospheres by utilizing the exothermicity of the reaction using self-propagating high temperature synthesis. Experiments were carried out using powdered reactants and compacts with varying densities. The reaction front propagated at a finite velocity depending upon the atmosphere, the diameter of the pellet and the particle sizes of the reactants. The exothermicity of the reaction between molybdenum and silicon raised the temperature of the product to 1886 K, which is close to the theoretical adiabatic combustion temperature, 1900 K. X-ray diffraction analysis of the product confirmed the product to be a single phase MoSi2 crystallizing in a tetragonal structure. Microstructural examination revealed melting of Si and its capillary flow, and chemical analysis indicated that the product is much purer than the reactants.
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Deevi, S.C. Self-propagating high-temperature synthesis of molybdenum disilicide. J Mater Sci 26, 3343–3353 (1991). https://doi.org/10.1007/BF01124683
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DOI: https://doi.org/10.1007/BF01124683