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含能材料 2007

Mg-Al／PTEE烟火药爆炸性能的研究（英）

Bogdan,ZYGMUNT

Keywords: PTFEasoxidizer,high-ratecombustion,blastwave,explosivepressureresistance(EPR)

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Abstract:

Theobjectoftheresearchareexplosivepropertiesofthepyrotechniccompositeconsistoffinegrademagnesium-aluminiumpowder(PAM)andhighlydispersedpolytetrafluorethylene(PTFE).Thecompositerevealshighresistancetoallmechanicalandthermalimpulsesandisextremelysensitivetohotsparksandopenfire.Theburningrateofthecompositionchangesfrom1cm·s-1to100m·s-1alongwithdecreasingitsdensity.Chargesofthecompositionwithdensitybelow1g·cm-3burnsoviolently,thatthephenomenaissimilartoexplosion.Chargeswithdensityabove1.1g·cm-3burnrelativelyrapidlyandstably.Themainpartofthepaperconcernsthepressureimpulsesintheairgeneratedduringhigh-rateburningofthecompositionofbulkdensity.Thenatureofthegeneratedpressureimpulseisnotthatofatypicalshockwave.Ariseofpressureoverthedistancefromthepointofexplosiontothemaximumvaluelasts50-100milliseconds,whileforshockwavesthisfactorislessthanamicrosecondforequivalentcharges.Themethodsofinitiationofthecompositioninfluencetheshapeandparametersofthepressureimpulse.Theexplanationofthenatureofgreatchangesofthecompositionburningratehasbeenproposed.Theeffectdescribedinthepaperwasusedforevaluationofexplosivepressureresistanceofindustrialdoorsandwindows.

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