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【英文标准名称】:StandardPracticesforMeasurementofLiquidusTemperatureofGlassbytheGradientFurnaceMethod
【原文标准名称】:用梯度炉法测量玻璃的液化温度的规程
【标准号】:ASTMC829-1981(2005)
【标准状态】:现行
【国别】:
【发布日期】:1981
【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】:C14.04
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:玻璃;工艺;测量
【英文主题词】:crystallization;glass;gradientfurnace;liquidus
【摘要】:Thesepracticesareusefulfordeterminingthemaximumtemperatureatwhichcrystallizationwillforminaglass,andaminimumtemperatureatwhichaglasscanbeheld,forextendedperiodsoftime,withoutcrystalformationandgrowth.1.1Thesepracticescoverproceduresfordeterminingtheliquidustemperature(Note0)ofaglass(NOTE0)byestablishingtheboundarytemperatureforthefirstcrystallinecompound,whentheglassspecimenisheldataspecifiedtemperaturegradientoveritsentirelengthforaperiodoftimenecessarytoobtainthermalequilibriumbetweenthecrystallineandglassyphases.Note0ThesetermsaredefinedinDefinitionsC162.1.2Twomethodsareincluded,differinginthetypeofsample,apparatus,procedureforpositioningthesample,andmeasurementoftemperaturegradientinthefurnace.Bothmethodshavecomparableprecision.MethodBispreferredforveryfluidglassesbecauseitminimizesthermalandmechanicalmixingeffects.1.2.1MethodAemploysatrough-typeplatinumcontainer(tray)inwhichfinelyscreenedglassparticlesarefusedintoathinlathconfigurationdefinedbythetrough.1.2.2MethodBemploysaperforatedplatinumtrayonwhichlargerscreenedparticlesarepositionedoneperholeontheplateandarethereforemeltedseparatelyfromeachother.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q33
【国际标准分类号】:81_040_10
【页数】:9P.;A4
【正文语种】: