BS 7034-7-1988 玻璃粘度和测定粘度固定点.第7部分:采用射束弯曲法对退火点和应力点的测定方法

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【英文标准名称】:Viscosityandviscometricfixedpointsofglass-Methodforthedeterminationofannealingpointandstrainpointbybeambending
【原文标准名称】:玻璃粘度和测定粘度固定点.第7部分:采用射束弯曲法对退火点和应力点的测定方法
【标准号】:BS7034-7-1988
【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(BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:精密度;粘度;试验条件;试验设备;试样制备;应变;基准点确定;弯曲试验;温度;玻璃;退火;挠曲试验;惯性矩;棒材;校准;公式;负荷
【英文主题词】:Annealing;Annealingandstrainpoint;Determination;Glass;Testing;Tests;Thermalpropertiesofmaterials;Thermodynamicproperties;Viscosity
【摘要】:ThispartofISO7884specifiesamethodofdeterminingthean-nealingpointandthestrainpointofaglassbybeambending.Thesevalueshavebeenfoundusefulforspecifyingthecoolingprogrammeintheproductionofglassware.Theannealingpointandstrainpointincludeawell-definedtemperaturedecreaseduringthemeasurement.Attemperaturescorrespondingtotheannealingandstrainpoints,theviscosityofglassishighlytimedependent.Hence,anyviscositiesthatmightbederivedorinferredfrommeasurementscarriedoutaccordingtothispartofISO7884cannotbeassumedtorepresentequilibriumstructuralcon-ditions.Therefore,theinsertionofthestrainpointintotheVFT-equation(seeISO7884-1)isalwaysimpossible.Theinser-tionoftheannealingpointcausesinsomecasesmarkedfailures.NOTE—TheannealingandstrainpointsbybeambendingcanalsobedeterminedusingdevicesasspecifiedinISO7884-4,butthesedevicesaremoreexpensiveandtheproceduresleadtosomeviscosity-temperatureandviscosity-timerelationshipsbesidesthefixedpoints.InthispartofISO7884,however,thedeviceandprocedurearerestrictedtothefixed-pointdetermination.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】:12P.;A4
【正文语种】:英语