Boron Extension Medicine Reaction Mechanism

The reaction mechanism of two kinds of Boron-based delay compositions(B/Pb3O4 and B/BaCrO4 delay compositions) has been studied in this paper. The main research includes: DTA, TG and DSC-TG thermal analyses of the delay compositions, study on combustion characteristics like burning rate and heat of reaction and x-ray diffraction(XRD) analysis on the reaction residues as well. The research results indicate that twodifferent kinds of reactions will beoccurring in the process of the combustion. Pre-ignitionReaction(PIR) occurs at the beginning of the combustion reaction, which is concluded tobe a genuine solid-solid reaction. The extent of easiness of PIR affects the long-term storage capability directly and may eventually affects the delayperformance of the delay composition. In this paper, the delay precision of B/Pb3O4 delay composition is proved to be not as good as that of B/BaCrO4 delay composition through the research of PIR. Ignition Reaction is the main reaction of the combustion, which is a gassolid reaction. Ignition Reaction possesses an important theoretic guiding sense in the design of the composition and the forecast of the delay precision of a certain delay element. The stoichiometric composition of the ignition reaction generally owes the maximum buring rate and the maximum heat of reaction.