Solid state reactions in the AI-MoO3 system for the synthesis of Al2O3 aluminide composites

Authors

  • J. Marín Departamento de Ingeniería Metalúrgica, Universidad de Santiago de Chile; Unidad de Combustible, Comisión Chilena de Energía Nuclear
  • J. Lisboa Unidad de Combustible, Comisión Chilena de Energía Nuclear
  • P. Rojas Unidad de Combustible, Comisión Chilena de Energía Nuclear
  • R. Rojas Departamento de Ciencia de Materiales, Universidad Técnica Federico Santa María, Valparaíso
  • R. Parada Departamento de Ciencia de Materiales, Universidad Técnica Federico Santa María, Valparaíso
  • J. Reyes Departamento de Ingeniería Metalúrgica, Universidad de Santiago de Chile
  • D. García Departamento de Ingeniería Química, Universidad de Federal de Santa Catarina, Florianápolis

DOI:

https://doi.org/10.3989/revmetalm.2002.v38.i1.379

Keywords:

Composite, Aluminothermic, Alumina, Aluminide, Molibdenum.

Abstract


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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Published

2002-02-28

How to Cite

Marín, J., Lisboa, J., Rojas, P., Rojas, R., Parada, R., Reyes, J., & García, D. (2002). Solid state reactions in the AI-MoO3 system for the synthesis of Al2O3 aluminide composites. Revista De Metalurgia, 38(1), 23–29. https://doi.org/10.3989/revmetalm.2002.v38.i1.379

Issue

Vol. 38 No. 1 (2002)

Section

Articles

License

Copyright (c) 2002 Consejo Superior de Investigaciones Científicas (CSIC)

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