Study On The Influence Of Addition On RDX Sensitivity And Performance

RDX was made as the main explosive. Nano diamond, graphene and nano porous siliconwere made as additives. The performance of RDX-based explosive was studied from the typeand proportion of additives. Graphite oxide was prepared by improved Hummers method, andthe reduction of graphite oxide was diazotized modified. Its application was explored inenergetic materials.The mass fraction of additives was respectively1%,3%,5%and7%. Nano diamond andgrapheme were added by mechanical mixing method, and nano porous silicon compound wasprepared by recrystallization deposition method. The effect laws of the additives types andcontent were studied from the impact sensitivity, friction sensitivity, detonation velocity,detonation pressure, blasting heat and thermal stability.At the same additive proportions, the impact sensitivity of confections in the order: nanodiamond/RDX>grapheme/RDX>nano porous silicon/RDX. With the increasing of additivecontent, the impact sensitivity increased. But the impact sensitivity of the confections of nanoporous silicon is significantly reduced, even lower than the pure RDX.At the same additive ratio, the friction sensitivity of confection is: nano diamond/RDX>nano porous silicon/RDX>grapheme/RDX. With the increasing of additive content,the friction sensitivity increased. When the content of graphene is less than7%, the frictionsensitivity of RDX is decreased. Nano diamond can significant increase the friction sensitivityof RDX. When adding addition of3%, the friction sensitivity has reached100%.The different content and types of additions on the influence of the detonation velocitywere tested, the results show that with the increase of additive content, the detonation velocityis lower. When graphene content is more than5%, the detonation velocity has the biggestdecrease. When adding1%nano diamond, the detonation velocity of RDX improved by2.1%.The effects of different additives on the explosive output characteristics were measured by the steel concave. Nano porous silicon and nano diamond can improve the detonationpressure of RDX, and graphene make decrease RDX explosive pressure.Through the theoretical calculation of detonation heat, it is concluded that the detonationheat of nano porous silicon/RDX confection is increasing with its content increasing. Thedetonation heat of graphene and nano diamond confections decrease with the increase of thecontent.Thermal analysis of nano porous silicon/RDX results show that compared with the pureRDX the peak temperature of confections melting process is relatively increased. In additionto3%nano porous silicon/RDX, the peak temperature of others confections are reduced withthe increase of nano porous silicon content.Through the XRD, FT-IR and TG-DTA test, the graphite oxide and diazotizationmodified graphene were characterized. The results show that diazotization modified graphenebegins to decompose exothermic at500℃, and it is a kind of energetic material with goodthermal stability.