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1、178Propellants,Explosives,Pyrotechnics30(2005),No.3ProductionofNanocrystallineRDXbyRapidExpansionofSupercriticalSolutionsVictorStepanovUSArmy,RDECOM-ARDEC,ArmamentsEngineeringTechnologyCenter,Picatinny,NJ07806-5000(USA)LevN.Krasnoperov*,IngaB.ElkinaDepartmentofChemistryandEnvironmentalS
2、cience,NewJerseyInstituteofTechnology,UniversityHeights,Newark,NJ07102(USA)XuyeanZhangMaterialCharacterizationLaboratory,NewJerseyInstituteofTechnology,UniversityHeights,Newark,NJ07102(USA)Abstractcrystaldislocationsmayalsocontributetotheformationofhotspots.Nanoscalecrystalsofcyclotrime
3、thylenetrinitramine(RDX)ExistingtheoreticalmodelsfortheimpactinitiationofwereproducedbyRapidExpansionofSupercriticalSolutionsexplosivesindicatethatthesensitivitytoexternalstimuli,(RESS).Theexperimentswereperformedbyexpansionofsuchasimpact-inducedhighratedeformation,shouldsupercriticalso
4、lutionsofRDXincarbondioxidethroughsapphirenozzles(ID:100and150mm)atpressuresof15.0–29.5MPaanddecreasewithdecreasingcrystalsize[2].Availableexper-temperaturesof343–348K.Recrystallizedparticleswerechar-imentaldataindicatethatthesensitivitytostimulisuchasacterizedbyFieldEmissionScanningEle
5、ctronMicroscopyimpactorshockisdecreasedasthecrystalsizeisreduced.(FESEM),X-raydiffraction,HPLCandmeltingpointanalysis.Giffordetal.investigatedthepropertiesofsubmicronRDXTheprocessproducedparticleswithameansizeintherange110–220nmandanarrowsizedistribution.TheproductwasandPETN[3].Signific
6、antlyreducedsensitivitytolongcrystallineasdeterminedbyX-raydiffraction.Theeffectofdurationshockswasobserved.Inaddition,novelbehaviorinprocessconditions(T,P,nozzlediameter)onthecrystalsizedeflagrationtodetonationtransitionwasobservedwithdistributionwasdetermined.submicronmaterials.Astudy
7、bySeitzindicatesthatshockspreadingisgreatlyKeywords:NanoscaleCrystals,RDX,RESS,CO2,SupercriticalSolutionimprovedinchargescomposedofsmallercrystals[4].InaseriesofexperimentsutilizingtheFlorettest,itwasobservedthattheacceptorexplosivecomposedoffiner1IntroductionTATBcrystalsshowed
