Kinetic analysis of Magnesium Aluminate Spinel formation: Effect of MgO:Al2O3 ratio and titania dopant

Content Provider	Semantic Scholar
Author	Shamim, Mostofa Sinhamahapatra, Somnath Hossain, Jahangir Lahiri, Sayan Dana, Kausik
Copyright Year	2018
Abstract	The mechanistic pathway of MgO-Al2O3 reaction in solid state to form MgAl2O4 spinel was investigated to correlate the kinetic parameters with ratio of reactants (MgO:Al2O3) and with the presence of a doping agent, TiO2. The time-temperature-expansion data of oxide compacts was analyzed using several model free analyses and model based (linear and non-linear) kinetic algorithms. These indicated that spinel formation process can be best described by single step with n-dimensional Avrami equation for every MgO:Al2O3 ratio, irrespective of titania dopant. The activation energy (Ea) of the process was proportional to % spinel formed in each system and validated with quantitative XRD analysis. The higher value of Avrami coefficient (n) in 90 wt% Al2O3 compositions has been explained with geometric considerations of powder packing. Incorporations of 1% TiO2 in the MgO: Al2O3 oxide compact did not markedly affect the reaction model, frequency factor and Activation energy.
Starting Page	1868
Ending Page	1874
Page Count	7
File Format	PDF HTM / HTML
DOI	10.1016/j.ceramint.2017.10.124
Volume Number	44
Alternate Webpage(s)	http://isiarticles.com/bundles/Article/pre/pdf/110858.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.ceramint.2017.10.124
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article