华夏沪深3002453(PT2453)

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FIG.1ToolforLevelingCaulkingCompoundintheShrinkageTestSpecimen
compoundforatleast5hat2362°C(73.463.6°F).
ureforShrinkageDetermination
9.1Placethebrassringononeoftheground-glassplates.
Determinethevolumeoftheringby?llingitwithdistilled
waterat2362°C(73.463.6°F),
thewaterslowlyfromtheburetintotheringsothatthereare
noairbubblesvisiblewhentheglasscoverplateiscenteredon
theamountofwaterrequiredto?llthe
ringtothenearest0.03mL,asV
r
.
a6-mm
1
(?
4
-in.)layerofcompoundinthering,usingthelevelingtool
toformgoodcontactwithringandstone(Fig.1).Theleveling
toolshould?t?rmlyagainsttheinsidesurfaceoftheringwhile
stilledwaterfromtheburetintothe
ringuntilitisexactly?lled(withoutairbubbles),asdeter-
minedbycoveringwithaground-glassplate(Fig.2).Record
thequantityofwaterneededto?llthering(readingtheburet
toanaccuracyof0.03mL)anddesignatetheamountasV
i
.
9.3Pouroutthewaterfromtheringandplacethespecimen,
atthesamelevelasthetemperaturemeasuringdevice,inan
ovensetat6562°C(14963.6°F)ndofthis
exposureperiodandafterthespecimenhascooledfor2hat
roomtemperature,repeatthe?llingoftheringusingtheburet
andrecordthevolumeofwaterusedasV
f
.
ation
10.1Calculatetheshrinkage,involumepercent,asfollows:
Shrinkage,%5
@~
V
f
2V
i
!

~
V
r
2V
i
!#
3100(1)
where:
V
r
5volumeofring,mL,
V
f
5volumeofwaterrequiredto?llringafter120h
exposure,and
V
i
5volumeofwaterrequiredto?llringbeforeoven
exposure.
ureforTenacityDetermination
11.1Aftertheshrinkagedeterminationhasbeencompleted,
runthepointoftheknifebladealongtheinsideedgeofthering
e
stiffputtyknife,loosenonehalfofthecaulkingpatfromthe
heputtyknifeundertheloosenedportionofthe
compoundandfoldover180°ontotheremainingpartofthe
compound,returntotheoriginalposition,andrepeatthe
operationuntilsixfoldshavebeenmadealongthesameline.
Embrittlementorlackoftenacityisindicatedbybreakingor
crackingofthecaulkinglayeratthecrease.

12.1Shrinkage—Reportthepercentofvolumeshrinkage.
12.2Tenacity—Reportaspassorfail;passagerequiresa
minimumofsixfolds.
ionandBias
13.1Shrinkage—Onthebasisofaroundrobininwhich
FIG.2StagesintheShrinkageTestProcedure

eightlaboratoriestestedtwosamples,the“between-
laboratories”standarddeviationoftheamountofshrinkage,
expressedinpercent,byvolume,
onthisvalueofthestandarddeviation,thefollowingcriteria
shouldbeusedforjudgingtheacceptabilityofresultsatthe
95%con?dencelevel:
13.1.1Repeatability—Nodataatthepresenttime.
13.1.2Reproducibility—Tworesultsobtainedbyoperators
indifferentlaboratoriesshouldbeconsideredsuspectifthey
differbymorethan3.8percentagepoints.
13.2Tenacity:
13.2.1Onthebasisofaroundrobininwhicheight
laboratoriestestedtwosamplesina“pass-fail”test,therewas
aunanimousagreementamongalltheparticipantlaboratories
onthetwosamplestested.
13.2.2Repeatability—Nodataatthepresenttime.
ds
14.1caulkingcompound;?exibility;shrinkage
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fthisstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuch
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在一机厂汇报上去之后，上头相当重视，很快就下来了一个特殊的小队，眼前的这个李大海，就是专门负责这件事的。 但是，如果自己改进的话，怎么改？不吃透技术，只知道照瓢画葫芦，那是没有办法改的。 一机厂的靶场里，很是热闹，黄老走下车来的时候，看着一辆辆正在测试的坦克，眼睛中带着欣赏。 现在当然是做不到这种方式的，这需要长时间的不断地改进，其实现在，爆炸反应装甲，也刚刚是成熟了而已，并没有太广泛的应用起来，秦振华把它拿出来说，自然也是最有前瞻性的了。 我们几百年的工业技术的结晶，怎么能让你们只有几十年工业历史的国家给测绘仿制了？这当然是不可能的了！