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Effect of Mechanical Activation on the Synthesis of Ba-Celsian and Sr-Celsian using Precursor Mixtures Containing Coal Fly Ash

Published online by Cambridge University Press:  02 March 2016

Claudia M. Lopez-Badillo ,
Jorge López-Cuevas ,
Carlos A. Gutiérrez-Chavarría ,
José L. Rodríguez-Galicia  and
Elia M. Múzquiz-Ramos
Claudia M. Lopez-Badillo
Affiliation:
Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Blvd. V. Carranza y José Cárdenas, 25280, Saltillo, Coahuila, México.
Jorge López-Cuevas
Affiliation:
CINVESTAV-IPN, Unidad Saltillo, Parque Industrial Saltillo-Ramos Arizpe, Industria Metalúrgica No. 1062, 25900 Ramos Arizpe, Coahuila, México.
Carlos A. Gutiérrez-Chavarría
Affiliation:
CINVESTAV-IPN, Unidad Saltillo, Parque Industrial Saltillo-Ramos Arizpe, Industria Metalúrgica No. 1062, 25900 Ramos Arizpe, Coahuila, México.
José L. Rodríguez-Galicia
Affiliation:
CINVESTAV-IPN, Unidad Saltillo, Parque Industrial Saltillo-Ramos Arizpe, Industria Metalúrgica No. 1062, 25900 Ramos Arizpe, Coahuila, México.
Elia M. Múzquiz-Ramos
Affiliation:
Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Blvd. V. Carranza y José Cárdenas, 25280, Saltillo, Coahuila, México.
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Abstract

BaAl2Si2O8 and SrAl2Si2O8 were synthesized by solid-state reaction of stoichiometric mixtures of either BaCO3 or SrCO3 with coal fly ash and Al2O3. The mixtures were mechanically activated in an attrition mill for up to 12 h and then reaction-sintered at 900-1300 °C, aiming to promote the formation of BaAl2Si2O8 and SrAl2Si2O8 as well as the conversion from their hexagonal (Hexacelsian) into their monoclinic (Celsian) forms, which is associated with improved mechanical properties in the sintered materials. Especially in the case of SrAl2Si2O8, the formation of Celsian was favored at relatively low sintering temperatures by increasing milling time. Although only the SrAl2Si2O8 composition was fully converted into Celsian, the Hexacelsian to Celsian conversions obtained for the mechanically-activated BaAl2Si2O8 composition were significantly higher than those previously reported in the literature for this compound. This could be attributed to the use of coal fly ash as raw material, which contains mineralizers that promote the mentioned conversion.

Keywords

BaSrPhase transformation
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1812: Symposium 6B – Advanced Structural Materials—2015 , 2016 , pp. 89 - 94
Copyright
Copyright © Materials Research Society 2016 

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References

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