MIL-S-50826B
作者:标准资料网 时间:2024-05-19 08:18:32 浏览:8765
来源:标准资料网
MIL-S-50826B, MILITARY SPECIFICATION: SOFT SOLDERED ELECTRICAL CONNECTIONS FOR SPECIAL WEAPONS ITEMS INCLUDING OTHER RELATED ELECTRONIC DEVICES (01 OCT 1975) [S/S BY MIL-STD-2000]., This soldering specification covers requirements and inspection criteria for soft soldered electrical connections in intricate and complex electronic or electromechanical devices related to special weapons and other associated electronic systems.
【英文标准名称】:StandardTestMethodforMeasurementoftheSurfaceTensionofSolidCoatings,SubstratesandPigmentsusingContactAngleMeasurements
【原文标准名称】:使用接触角测量固体涂料、基质和颜料的表面张力的标准试验方法
【标准号】:ASTMD7490-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D01.23
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:adhesion;contactangles;dispersionandpolarcomponentsofsolidsurfacetension;solidsurfacetension;wetting
【摘要】:Themethoddescribedinthisstandardisbasedontheconceptthatthetotalfreeenergyatasurfaceisthesumofcontributionsfromdifferentintermolecularforces,suchasdispersion,polarandhydrogenbonding.Thereareothertechniquesthatemploythreecomponents(dispersion,polarandhydrogenbonding).Thesemethodsarefurthercomplicatedbyneedingthreetofivetestliquidsandarenotpracticalforroutinetesting.Thismethodusescontactanglesoftwoliquidstoprovidedataforthecalculationoftwocomponents,dispersion,x03B3;sd,andpolar,x03B3;sp.Dispersionandpolarcomponentdata,alongwiththetotalsolidsurfacetension,areusefulforexplainingorpredictingwettingoradhesion,orboth,ofcoatingsonpretreatments,substratesandothercoatings.Lowsolidsurfacetensionvaluesoftenareasignofcontaminationandportendpotentialwettingproblems.Highpolarcomponentsmaysignalpolarcontamination.Thereisevidenceintheliteraturethatmatchingofpolarcomponentsoftopcoatsandprimersgivesbetteradhesion.Solidsurfacetensionsofpigments,particularlythepolarcomponents,maybeusefulinunderstandingdispersionproblemsortoprovidesignalsforthecompositionofdispersantsandmillbases.However,comparisonofpigmentsmaybedifficultiftherearedifferencesintheroughnessorporosity,orboth,ofthediskspreparedfromthem.Althoughthistechniqueisveryusefulincharacterizingsurfaces,evaluatingsurfaceactiveadditivesandexplainingproblems,itisnotdesignedtobeaqualitycontrolorspecificationtest.1.1Thistestmethoddescribesaprocedureforthemeasurementofcontactanglesoftwoliquids,onepolarandtheothernonpolar,ofknownsurfacetensiononasubstrate,pigment(intheformofadisk),orcuredorairdriedcoatinginordertocalculatethesurfaceproperties(surfacetensionanditsdispersionandpolarcomponents)ofthesolid.1.2Thetotalsolidsurfacetensionrangethatcanbedeterminedusingthismethodisapproximately20to60dynes/cm.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G50
【国际标准分类号】:87_040
【页数】:4P.;A4
【正文语种】:英语
【英文标准名称】:Tyrevalves;ISOcorechamberNo.2
【原文标准名称】:轮胎气门嘴ISO2号气门咀型腔
【标准号】:ISO6762-1981
【标准状态】:作废
【国别】:
【发布日期】:
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:
【国际标准分类号】:
【页数】:
【正文语种】:
