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8 9 4 FANG Kuang,CHEN Qingchou,FU Qiubo,WANG Yao
plesareidentical300μ m,andallthetestswereconductedin AsitillustratedinFig.6,thereisn′tdistinctdisparityof
thesamefiringset,thecapacitanceis0.2μ F,thecharging flyeraccelerationcapabilitybetweenparyleneC andpolyim
voltage2.6kVandthedischargeduration1.2μ s. ide.Basedonthispremise,wesetanotherfiringtesttocheck
Toinvestigatetheinfluenceofcomponentsmaterialonthe impactoftheepoxybasedphotoresistbarrel(Su8)onthefly
flyeracceleration capability, we′ve set4 testgroups, the er′sacceleration.Fig.7givesustheflyeraccelerationdetails
parameterswerelistedinTable1.Theflyers′accelerationhis betweendifferentbarrels,Fig.7apolyimideflyer,andFig.7b
torieshavebeenrecordedbythePDVsystem. paryleneCflyer.
Table1 ThesampleparametersofEFI
foil barrel flyer
barrel flyer
sample thickness length thickness
material material
/ μ m /mm / μ m
1 # 3 0.4 Su8 40 polyimide
2 # 3 0.4 Su8 40 paryleneC
#
3 3 0.4 Steel 40 polyimide
4 # 3 0.4 Steel 40 paryleneC
Fig.6givesustheaccelerationhistorycomparisonofdif
a.polyimideflyer
ferentflyers,Fig.6aSu8 barrel,Fig.6b Steelbarrel.Asit
showninFig.6a,itseemsthattheflyeraccelerationprofiles
matchedwitheachotherquitewell,andforFig.6btheveloci
tydiscrepancyisnomorethan5%.Thoughthereisadensity
divergencebetween1.35 g· cm -3 ofparyleneC flyerand
1.42g·cm -3 ofpolyimideflyer,thedivergencemightbeab
sorbed by the substrate binding force discrepancy between
CVD methodandnormalassemblyprocess.
b.paryleneCflyer
Fig.7 FlyervelocitydiagnosticofEFIassembledwithdifferentbarrelmaterial
AsitshowninFig.7,theEFIwithSu8photoresistbarrel
#
#
(1,2)provideusthesimilarflyeraccelerationprofilecom
#
#
paringwiththeEFIwhichisconsistofsteelbarrel(3,4 ).
Thoughtheflyervelocityattheimpactionpoint0.4mm isdif
-1 # -1 #
ferentinFig.7b,3454.5m·s (2)and3312.9m·s (4),
thedisparityiswithin4%.In addition,alltheflyershave
a.Su8barrel
reachedto75% oftheultimatevelocityin thefirst80 ns,
[6]
whichisconsistentwith thetestresultofChen ,and the
[7]
VISARdiagnosticprofileofHatt .
4.2 InfluencesofFoilThicknessontheFlyerAcceleration
Capability
Toinvestigatetheimpactoffoilthicknessonflyeracceler
ationcapabilityofintegratedEFI,we′veset2testgroupswith
differentfoilthickness,butidenticalflyerandbarreldimen
sion.TheparameterswerelistedinTable2.
Theacceleration profilesrecorded bythePDV system
b.Steelbarrel
#
Fig.6 FlyervelocitydiagnosticofEFIassemblieswithdifferentflyer wereexhibited in Fig.8,theflyerofsample1 accelerated
#
material muchfasterthanthatofsample2 atthebeginningofaccelera
ChineseJournalofEnergeticMaterials,Vol.24,No.9,2016(892-897) !"#$ www.energeticmaterials.org.cn