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The combustion delay mixture of tungsten (W), potassium perchlorate (KClO4),and barium chromate (BaCrO4), also known as the WKB mixture, has long beenconsidered to be an integral part of military-grade ammunition. Despite itslong history, however, their progressive reaction dynamics remains a questionmark, especially due to the complex nature of their combustion reaction. Asopposed to a one-step oxidation commonly observed in conventional combustions,the WKB mixture is associated with a multibody reaction between its solid-statecomponents. To this end, the emergence of three combustion peaks, which wecorresponded with disparate chemical reactions, was observed usingthermogravimetric analysis on two separate WKB mixtures with differing mixtureratios. We applied the stepwise isoconversional method on each of the peaks tomatch the combustion chemistry it represents to the Sestak-Berggren model andcomputed the conceptual activation energy. Further plotting the logarithmicpre-exponential factor as a function of the reaction progress, we demonstrate amethod of using the plot as an intuitive tool to understand the dynamics ofindividual reactions that compose multi-step chemical reactions. Our studyprovides a systematic approach in visualizing the reaction chemistry, therebystrengthening the analytical arsenal against reaction dynamics of combustioncompounds in general.

Visualization of reaction chemistry in W-KClO4-BaCrO4 delay mixtures via a Sestak-Berggren model based isoconversional method