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In situ formation of intermetallic/ceramic composites composed of molybdenum silicides (Mo 5 Si 3 and Mo 3 Si) and magnesium aluminate spinel (MgAl 2 O 4 ) was conducted by combustion synthesis with reducing stages in the mode of self-propagating high-temperature synthesis (SHS). The SHS process combined intermetallic combustion between Mo and Si with metallothermic reduction of MoO 3 by Al in the presence of MgO. Experimental evidence showed that combustion velocity and temperature decreased with increasing molar content of Mo 5 Si 3 and Mo 3 Si, and therefore, the flammability limit determined for the reaction at Mo 5 Si 3 or Mo 3 Si/MgAl 2 O 4 = 2.0. Based upon combustion wave kinetics, the activation energies, E a = 68.8 and 63.8 kJ/mol, were deduced for the solid-state SHS reactions producing Mo 5 Si 3 - and Mo 3 Si-MgAl 2 O 4 composites, respectively. Phase conversion was almost complete after combustion, with the exception of trivial unreacted Mo existing in both composites and a minor amount of Mo 3 Si in the Mo 5 Si 3 -MgAl 2 O 4 composite. Both composites display a dense morphology formed by connecting MgAl 2 O 4 crystals, within which micro-sized molybdenum silicide grains were embedded. For equimolar Mo 5 Si 3 - and Mo 3 Si-MgAl 2 O 4 composites, the hardness and fracture toughness are 14.6 GPa and 6.28 MPa m 1/2 , and 13.9 GPa and 5.98 MPa m 1/2 , respectively.

Formation of Mo5Si3/Mo3Si–MgAl2O4 Composites via Self-Propagating High-Temperature Synthesis