【英文标准名称】:StandardPracticeforCalibrationofTemperatureScaleforThermogravimetry
【原文标准名称】:热解重量测定用温标校准的标准实施规程
【标准号】:ASTME1582-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【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】:E37.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:实施规程;校正;试验;跌落试验;温度;仪表刻度
【英文主题词】:CuriePointstandards;magnetictransitionstandards;meltingpointstandards;temperaturecalibration;thermogravimetry
【摘要】:Thermogravimetricanalyzersareusedtocharacterizeabroadrangeofmaterials.Inmostcases,oneofthedesiredvaluestobeassignedinthermogravimetricmeasurementsisthetemperatureatwhichsignificantchangesinspecimenmassoccur.Therefore,thetemperatureaxis(abscissa)ofallapparent-mass-changecurvesmustbecalibratedaccurately,eitherbydirectreadingofatemperaturesensor,orbyadjustingtheprogrammertemperaturetomatchtheactualtemperatureoverthetemperaturerangeofinterest.Inthelattercase,thisisaccomplishedbytheuseofeithermeltingpointormagnetictransitionstandards.Thispracticepermitsinterlaboratorycomparisonandintralaboratorycorrelationofinstrumentaltemperaturescaledata.1.1Thispracticedescribethetemperaturecalibrationofthermogravimetricanalyzersoverthetemperaturerangefrom25to1500176;Candisapplicabletocommercialandcustom-builtapparatus.Thiscalibrationmaybeaccomplishedbytheuseofeithermeltingpointstandardsormagnetictransitionstandards.1.2Themasschangecurveinthermogravimetryresultsfromanumberofinfluences,someofwhicharecharacteristicofthespecimenholderassemblyandatmosphereratherthanthespecimen.Thevariationsfrominstrumenttoinstrumentoccurinthepointofmeasurementofthetemperature,thenatureofthematerial,itssizeandpacking,thegeometryandcompositionofthespecimencontainer,thegeometryanddesignofthefurnace,andtheaccuracyandsensitivityofthetemperaturesensoranddisplayingscales.Theseallcontributetodifferencesinmeasuredtemperatures,whichmayexceed20176;C.Inaddition,somesampleholderassemblieswillshowvariationsofmeasuredtemperaturewithsamplesizeorheating/coolingrate,orboth.Sinceitisneitherpracticalnoradvisabletostandardizesampleholdersorthermobalancegeometries,instrumentsmaybecalibratedbymeasurementofthedeviationofameltingormagnetic(CuriePoint)transitiontemperaturefromthestandardreferencetemperature.Thisdeviationcanbeappliedasacorrectiontermtosubsequentmeasurements.1.3Thispracticeassumesthattheindicatedtemperatureoftheinstrumentislinearovertherangedefinedbyatwo-pointcalibrationandthatthislinearityhasbeenverified.Thesetwocalibrationtemperaturesshouldbeasclosetotheexperimentalmeasurementstobemadeaspossible.1.4Thispracticedescribesthreeproceduresfortemperaturecalibrationofthermogravimetricanalyzersusinganytypebalance.ProceduresAandBusemeltingpointstandardswithverticalandhorizontalbalances.ProcedureCusesmagnetictransitionstandardsforcalibration.ProcedureAisdesignedspecificallyforusewithhorizontal-typebalancesusingexternalfurnaces.ProcedureBisdesignedspecificallyforusewithverticalhang-downbalancesusingeitherinternalorexternalfurnaces.Noprocedureisrestrictedtotheuseofthefurnacetypedescribedinthatprocedure.1.5Computerorelectronic-basedinstruments,techniques,ordatatreatmentequivalenttothisproceduremaybeused.Note18212;Sinceallelectronicdatatreatmentsarenotequivalent,theusershallverifyequivalencypriortouse.1.6Thedatageneratedbytheseprocedurescanbeusedtocorrectthetemperaturescaleoftheinstrumentbyeitherapositiveornegativeamountusingeitheratwo-pointtemperaturecalibrationprocedureoramulti-pointtemperaturecalibrationwithbestlinefitforthegenerateddata.Note28212;Asingle-pointcalibrationmaybeusedwherethisistheonlyprocedurepossibleorpractical.Theuseofasingle-pointprocedureisnotrecommended.1.7SIunitsarestandard.1.8ThispracticeisrelatedtoISO11358butprovidesinformationandmethodsnotfoundinISO11358.1.9Thisstandarddoesnotpurporttoad......
【中国标准分类号】:N11
【国际标准分类号】:17_200_20
【页数】:9P.;A4
【正文语种】:
基本信息
标准名称: | 弯管机 技术条件 |
中标分类: |
机械 >>
通用加工机械与设备 >>
锻压机械 |
替代情况: | JB 2671-82 |
发布部门: | 国家机械工业局 |
发布日期: | 1998-07-17 |
实施日期: | 1998-12-01 |
首发日期: | 1900-01-01 |
作废日期: | 1900-01-01 |
提出单位: | 机械工业部锻压机械标准化技术委员会 |
归口单位: | 机械工业部济南铸造锻压机械研究所 |
起草单位: | 上海长江机械厂 |
起草人: | 宋杰 |
出版社: | 机械工业出版社 |
出版日期: | 1998-12-01 |
页数: | 8页 |
批文号: | 国机科[1998]278号 |
适用范围
JB/T 2671.2-1998 本标准是根据机械电子工业部 1993 年机械工业科学技术发展计划要求,对 JB 2671-82《弯管机 技术条件》进行的修订。 本标准规定了弯管机设计、制造和验收的要求,对本标准未规定的项目还应符合 JB 1829《锻压机械 通用技术条件》等有关标准的规定。 本标准适用于金属管材在冷态条件下弯曲的缠绕式弯管机。
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所属分类: 机械 通用加工机械与设备 锻压机械