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         Mechanical,ThermalConductivePropertiesandTabletImpactSensitivityofMicronanoHMXBasedPBX

         LIYuxiang,WUPeng,HUA Cheng,HUANG Bing,WANG Jun,QIAO Zhiqiang,YANG Guangcheng
         (InstituteofChemicalMaterials,CAEP,Mianyang621999,China)
         Abstract:Toinvestigatetheinfluencelaw ofparticlesizeontheimpactsensitivityofexplosivesinmicroandnanoscaleand
                                                                                             - 3            - 3
         mechanism ofaction,thepolymerbondedexplosives(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
         thehistoriesofforceactingonsamplesduringdrophammerimpactloadingweremeasuredbyaselfdesignedtestdevice.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);polymerbondedexplosive(PBX);impactsensitivity;particlesize;apparentdensity
         CLCnumber:TJ55                    Documentcode:A                DOI:10.11943/j.issn.10069941.2018.04.008


         ChineseJournalofEnergeticMaterials,Vol.26,No.4,2018(334 - 338)  !"#$          www.energeticmaterials.org.cn
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