New Aspects in Chemical Stability of Energetic Materials

摘要

This paper treats the phenomenon of chemical stability with a set of coupled differential equations. These equations may be connected with the names of Fourier and Fick. Furthermore two kinds of heat sources are employed. These heat sources are based on the reaction rate constant of Arrhenius and of vant' Hoff. The equations are presented in dimensionless form. By introducing simplifications it is shown how to come to the state of the art today that is governed by the reaction kinetic description of Arrhenius type only. Further simplification leads finally to the estimation of life time prediction in the sense of STANAG 4147. It is shown that this method is not appropriate. The application of the new procedure is demonstrated with an example. It is revealed how the decomposition of an explosive material depends on the type of heat source. The decomposition of a substance also depends on the volume and slightly on the heat transfer coefficient. The conclusion is that the Arrhenius heat source produces nearly no heat energy at room temperature. The heat source according to vant' Hoff is much more powerful and therefore appropriate in order to judge chemical stability. Chemical stability depends on the volume too.