Reacciones en estado sólido para el sistema Al-MoO3 en la fabricación de materiales compuestos Al2O3-aluminuros de Mo

J. Marín, J. Lisboa, P. Rojas, R. Rojas, P. Parada, J. Reyes, D. García

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

Resumen

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.

Título traducido de la contribuciónSolid state reactions in the Al-MoO3 system for the synthesis of Al2O3-Mo aluminide composites
Idioma originalEspañol
Páginas (desde-hasta)23-29
Número de páginas7
PublicaciónRevista de Metalurgia (Madrid)
Volumen38
N.º1
DOI
EstadoPublicada - 2002

Palabras clave

  • Alumina
  • Aluminide
  • Aluminothermic
  • Composite
  • Molybdenum

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