On problems of isoconversion data processing for reactions in Al-rich Al-MoO3 thermites

Document Type

Article

Publication Date

10-30-2008

Abstract

Isoconversion processing of thermoanalytical data, while becoming more and more widely used, remains problematic when used indiscriminately. The exothermic reaction in a 4Al·MoO3 nanocomposite thermite, prepared by arrested reactive milling, was investigated at heating rates ranging from 1 to 40 K/min. The data processing according to a number of traditional isoconversion methods (Kissinger, Friedman, Ozawa-Flynn-Wall), reveals distinct and experimentally reproducible nonlinear regions in the plots of their respective logarithmic function vs. inverse temperature, possibly indicating changes in reaction mechanism over this range of heating rates. More contemporary implementations of isoconversion algorithms give results that are substantially similar. In order to predict kinetic behavior under any heating conditions, especially outside the range of heating rates covered by experiments, a detailed mechanistic model of all involved processes is needed.

Identifier

53249103145 (Scopus)

Publication Title

Thermochimica Acta

External Full Text Location

https://doi.org/10.1016/j.tca.2008.07.008

ISSN

00406031

First Page

1

Last Page

6

Issue

1-2

Volume

477

Fund Ref

Defense Threat Reduction Agency

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