BS 7034-4-1988 玻璃粘度和测定粘度固定点.使用光束弯曲法测定粘度的方法

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【英文标准名称】:Viscosityandviscometricfixedpointsofglass-Methodforthedeterminationofviscositybybeambending
【原文标准名称】:玻璃粘度和测定粘度固定点.使用光束弯曲法测定粘度的方法
【标准号】:BS7034-4-1988
【标准状态】:现行
【国别】:英国
【发布日期】:1989-01-31
【实施或试行日期】:1989-01-31
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:控制图;玻璃;计数检查;测量;试样;测试;试验;粘度;粘度测量
【英文主题词】:Controlcharts;Glass;Inspectionbyattributes;Measurement;Samples;Testspecimens;Testing;Tests;Viscosity;Viscositymeasurement
【摘要】:ThispartofISO7884specifiesamethodofdeterminingthedynamicviscosityofglassonarod-shapedtestspecimen(calledabeam)supportedatitsends.Theviscousdeflectionrateofthebeamismeasuredunderagivenloadatthemidpointbetweenthesupports.Inadditiontheviscosity-temperaturerelationshipandthedependenceoftheviscosityonthethermalhistoryofthesamplecanbedetermined.Theviscosityrangecoveredbythismethodextendsfrom10to10dPa·s,correspondingtomeasuringtemperaturesbe-tweenabout900and400?forallglassesofnormalbulk-productioncompositions.Theproceduresarelimitedtosmalldeflectionsandtosmalldeflectionrates(see3.6).NOTE—Duringbeambending,elongationflowsofbothsignsoccur(zeropassagewithintheneutralplane).ThedeterminationofshearviscosityispossibleonlywithNewtonianorlinear-viscoelasticbehaviouroftheglass.Theproceduresaresensitivetointerferencebydevitrificationofthesample.Withviscositiesabove10dPa·sthead-justmentofthestructureequilibriumwithintheglassisperceptiblydelayedwithrespecttothetemperaturesetting.Fortestswithinthisrangeitshouldbeagreedwhetheritisnecessarytowaitforthefinalequilibriumviscosityatagiventemperatureortotaketheviscosityvaluecorrespondingtoaconventionaltemperature-timeprogramme(see6.3).note:*1dPa·s=1dN·s/m=1P(Pisthesymbolforpoise)
【中国标准分类号】:Q30
【国际标准分类号】:81_040_10
【页数】:16P.;A4
【正文语种】:英语