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sitivityevaluationofnanocrystallineRDXbasedexplosivecom
Mechanical,ThermalConductivePropertiesandTabletImpactSensitivityofMicronanoHMXBasedPBX
LIYuxiang,WUPeng,HUA Cheng,HUANG Bing,WANG Jun,QIAO Zhiqiang,YANG Guangcheng
(InstituteofChemicalMaterials,CAEP,Mianyang621999,China)
Abstract:Toinvestigatetheinfluencelaw ofparticlesizeontheimpactsensitivityofexplosivesinmicroandnanoscaleand
- 3 - 3
mechanism ofaction,thepolymerbondedexplosives(PBXs)sampleswithapparentdensityas1.74g· cm and1.50g· cm
werepressedfrom octogen(HMX,100 - 300nm,1 - 2μ m and10 - 20μ m)basedPBXmoldingpowder.TheeffectofHMXparticle
sizeandapparentdensityonthecompressionmechanicalproperties,thermalconductivepropertiesandtabletimpactsensitivityof
PBXsampleswerestudied.ThemicromorphologyofsamplesbeforeandafterimpactwithdrophammerwasobservedbySEM,and
thehistoriesofforceactingonsamplesduringdrophammerimpactloadingweremeasuredbyaselfdesignedtestdevice.Results
show thatthecompressivestrength,compressivemodulus,thermalconductivityandthermaldiffusivityofPBXincreasedramatical
lywithdecreasingparticlesizeofHMX.Insameapparentdensity,theimpactsensitivityofPBXdecreasessignificantlywithde
creaseofHMXparticlesize;forPBXsampleswithHMXofsameparticlesize,theimpactsensitivityincreasesslightlywiththein
creaseofapparentdensity.Underimpactaction,HMXsampleswithlargerparticlesizemainlyhappentheporecompressionand
particlecrackandHMXsampleswithsmallerparticlesizemainlyhappentheshearingslipofparticlelayer.Undersameimpact
condition,thepeakofforceactingonsampleincreaseswithincreasingapparentdensityordecreasingparticlesize.Considering
thatthedecreaseofimpactsensitivitycausedbyexplosiveparticlerefinementistheresultofthecombinedeffectoftheedecrease
ofporesize,uniformityofporestructure,andenhancementofthermalconductivityetc.factors.
Keywords:octogen(HMX);polymerbondedexplosive(PBX);impactsensitivity;particlesize;apparentdensity
CLCnumber:TJ55 Documentcode:A DOI:10.11943/j.issn.10069941.2018.04.008
ChineseJournalofEnergeticMaterials,Vol.26,No.4,2018(334 - 338) !"#$ www.energeticmaterials.org.cn