基本信息
| 标准名称： | 微动开关 产品质量分等 |
| 替代情况： | JB/GQ.F8007-87 |
| 发布部门： | 成都机床电器所 |
| 发布日期： | 1993-02-03 |
| 实施日期： | 1993-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
适用范围
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前言
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目录
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引用标准
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所属分类： 仪器 仪表 工业自动化仪表与控制装置 流量与物位仪表
【英文标准名称】:StandardTestMethodsforResidualCarbon,ApparentResidualCarbon,andApparentCarbonYieldinCokedCarbon-ContainingBrickandShapes
【原文标准名称】:焦化含碳砖和型材中残余碳,表观残余碳和表观残余碳量的标准试验方法
【标准号】:ASTMC831-1998(2008)
【标准状态】:现行
【国别】:美国
【发布日期】:1998
【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】:C08.04
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:carbonyield;coking;lossofignition;refractories;residualcarbon;Apparentcarbonyield;Carbon-containingmaterials/applications;Carboncontent;Carbonyield;Coking;Lossonignition(LOI);Refractories(brickandshapes)--pitch-bearing;Refractor
【摘要】:Thesetestmethodsaredesignedforusewithcarbon-containingproducts.Theresidualcarboncontentofacokedcarboncontainingbrickorshapeisanindicationofhowmuchcarbonmaybeavailable,inservice,toresistslagattackon,oroxidationlossof,thatbody.Apparentcarbonyieldgivesanestimateoftherelativeefficiencyofthetotalcarbonaceousmattertoberetainedasresidualcarbon.Residualcarbonhasadirectbearingonseveralpropertiesofapitchorresincontainingrefractorysuchasignitedporosity,density,strength,andthermalconductivity.Thesetestmethodsaresuitableforproductdevelopment,manufacturingcontrolandspecificationacceptance.Thesetestmethodsareverysensitivetospecimensize,cokingrates,etc.,therefore,strictcompliancewiththesetestmethodsiscritical.Appreciableamountsofreduciblecomponents,suchasFe2O3,willhaveanoticeableeffectontheresults.Thus,valuesobtainedbythesetestmethodswillbedifferentwhenbrickremovedfromserviceistested.Thismustbekeptinmindwhenattemptingtousethesetestmethodsinanabsolutesense.Oxidizablecomponentssuchasmetalsandcarbidescanhaveanoticeableeffectontheresults.Thismustbekeptinmindwhenusingthesecondprocedure,whichisbasedonmeasuringweightlossafterignitingthecokedspecimens.Testingofbrickorshapesthatcontainmagnesiummetalpresentsspecialproblemssincethismetalishighlyvolatileandsubstantialamountsofthemagnesiumcanbelostfromthesampleduringthecokingprocedure.Thismustbekeptinmindwheninterpretingtheresultsoftestingofbrickthatcontainmagnesium.Inaddition,magnesiumcanreactreadilywithatmospherichumidity.Thismustbekeptinmindwhenstoringbrickthatcontainmagnesium.1.1Thesetestmethodscoverthedeterminationofresidualcarboncontentincarbon-bearingbrickandshapesafteraprescribedcokingtreatment.Theyprovidetwoprocedures.Thefirstprocedureisbasedonthecombustionofcarbonanditsmeasurementascarbondioxide.However,whenusingthefirstprocedureforarticlesthatcontainsiliconcarbideorothercarbides,nodistinctionwillbemadebetweencarbonpresentintheformofacarbideandcarbonpresentaselementalcarbon.Thesecondprocedureprovidesamethodforcalculatingapparentresidualcarbon(onthebasisofweightlossafterignitingthecokedspecimens),apparentcarbonaceousmaterialcontent,andapparentcarbonyield.Ifthesecondprocedureisusedforbrickorshapesthatcontainmetallicadditivesorcarbides,itmustberecognizedthattherewillbeaweightgainassociatedwiththeoxidationofthemetals,orcarbides,orboth.Suchaweightgaincanchangetheresultssubstantiallyandthismustbekeptinmindwheninterpretingthedata.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q15
【国际标准分类号】:91_100_15
【页数】:7P.;A4
【正文语种】:英语