Product Code:SAE AIR1754
Title:Washer, Thermal Compensating, Metric Series
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:The purpose of this document is to define: - compensation washer application requirements - recommended materials - washer thickness determination - dimensioning
基本信息
| 标准名称： | 逆反射术语 |
| 英文名称： | Retroreflection vocabulary |
| 中标分类： |
公路、水路运输 >>
公路、水路运输综合 >>
基础标准与通用方法 |
| ICS分类： |
土木工程 >>
道路工程 >>
道路工程综合
|
| 发布日期： | 2007-06-28 |
| 实施日期： | 2007-10-01 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 11 |
适用范围
没有内容
前言
没有内容
目录
没有内容
引用标准
没有内容
所属分类： 公路 水路运输 公路 水路运输综合 基础标准与通用方法 土木工程 道路工程 道路工程综合
【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