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Low temperature synthesis of alpha alumina platelets and acicular mullite in MgO-Al2O3-SiO2 system
M. A. Zalapa-Garibay1,2, A. Arizmendi-Moraquecho2, S. Y. Reyes-López3
1 Instituto de Ingeniería y Tecnología, Universidad Autónoma de Ciudad Juárez, Av. del Charro 450, Partido Romero C.P. 32310.
2 Centro de Investigación de Materiales Avanzados, Alianza Norte 202. Parque de Investigación e Innovación Tecnológica, Alianza Norte, Apodaca, Nuevo León, México. C.P. 66600
3 Instituto de Ciencias Biomédicas, Universidad Autónoma de Ciudad Juárez, Envolvente del PRONAF y Estocolmo s/n, Ciudad Juárez, Chih., México C.P. 32300.
received August 27, 2018, received in revised form Febuary 28, 2019, accepted March 15, 2019
Vol. 10, No. 1, Pages 9-18 DOI: 10.4416/JCST2018-00043
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.
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Keywords
Mullite, alumina, microstructure.
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