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Low temperature synthesis of alpha alumina platelets and acicular mullite in MgO-Al₂O₃-SiO₂ system

M. A. Zalapa-Garibay, M. A. Zalapa-Garibay, A. Arizmendi-Moraquecho, S. Y. Reyes-López

Journal of Ceramic Science and Technology, Vol. 10, No. 1 (2019), pp. 9-18

DOI: 10.4416/JCST2018-00043

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Abstract

The refractory materials are more reliable and less expensive, this research is based on materials like alumina and mullite because it offers a very high refractoriness. In the present study an acicular mullite and α-alumina platelets were synthesized by using a synthesis of chemicals related to raw materials SiO2 45 wt%-Al2O3 45 wt% – MgO 10 wt%. The α-alumina platelets and acicular mullite were obtained in a reduced processing time and temperature, compare to conventional methods, such as sol-gel method, microwave sintering, chemical synthesis, combustion synthesis and lip casting and sintered. The composition, thermal analysis and micro structure evolution were followed by X-ray diffraction, differential thermal analysis and scanning electron microscopy (SEM). The synthesis of chemicals method based on Pechini process was successfully to synthesize α-alumina platelets and acicular mullite. All the precursor powders used have an amorphous structure with submicron particle size. The effect of MgO in the formation of α-alumina platelets and acicular mullite at low temperature was found. The α-alumina platelets and acicular mullite was detected after heating at 800 °C and the dissolution α-alumina platelets for the formation of secondary mullite is around 1000 °C. It was observed that at 1400 °C it's crystallized type III of secondary mullite. The behavior of the evolution of the phases and compact solid samples from oxides was made.

Keywords

Mullite, alumina, microstructure.

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