Solid state reactions in the AI-MoO3 system for the synthesis of Al2O3 aluminide composites
Keywords:Composite, Aluminothermic, Alumina, Aluminide, Molibdenum.
Ceramic matrix composites reinforced with metallic particles exhibit good mechanical properties. One research line has involved the fabrication of 3A (alumina-aluminide alloys) composites via in situ consolidation of aluminum reactive powders mixed with a metallic oxide. In this paper the solid state reactions for the Al-MoO3 system and the effect of the precursor compositions for obtaining Al2O3 composites and intermetallic aluminides are studied. The reactions in vacuum for the 25 °C to 750 °C temperature range, and the microstructural evolution up to 1200 °C were studied. DTA-TG and DSC were used to determine that a heating rate of 1 °C/min at the critical range of 500-600 °C, resulted in controlled aluminothermic reactions. XRD and SEM showed that in the sintered composites a microstructure composed of an Al2O3 matrix and a Mo aluminide /metallic Mo dispersed phase was present. The precursor composition affects the dispersed phase in the composite (Mo aluminides and/or metallic Mo), the relative Al2O3 /second phase quantities, and the hardness of the composite sintered at 1450 °C.
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