Reactivity Of Boron Type Delay

"The reactivity research of Boron-based delay compositions" is one of the National Defense Science and Industry Committee items, the topic originates from the conversion of military technologies and facilities to civilian use of the "Plastic Leads Explodes and its Delay Body". The article mainly takes BaCrO₄ as research object, Using DTA, TG, X beam diffraction (XRD) test methods and so on, from the formula design, storing, the processing preparation,the pre-ignition reaction and the ignition reaction five stages, studies the main factors which influence the reaction performance of delay compositions on various stages separately, then makes judgement and optimizes storing performance,combustibility and delay precision of the delay compositions.The researches indicates that: The Boron-based delay compositions has relatively delay precision and very good stable performance after long storarge.The pre-ignition reaction of B-BaCrO₄ delay compositions is concluded to be a genuine solid-solid reaction, the temperature range of reaction zone main centralism occurs at 750℃. Igition Reaction is the main reaction of the combustion, which is a gassolid reaction. As B- BaCrO₄ delay compositions, in theoretically, the stoichiometrie composition of the ignition allocated proportion is 14.6/85.4 (wt%), its easier to ignit when the content of Boron in powders is above 5.0%. The difference of ignition ability is not obvious. When the content of Boron is near 14.0%, the delay, compositions have the biggest heat of reaction and buming rate.Igition 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 processing preparation craft of the delay compositions have certain influences on delay time and precision.