ASTM B781-1993a(2006) 银镉氧化接触材料标准指南

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【英文标准名称】:StandardGuideforSilver-CadmiumOxideContactMaterial
【原文标准名称】:银镉氧化接触材料标准指南
【标准号】:ASTMB781-1993a(2006)
【标准状态】:现行
【国别】:
【发布日期】:1993
【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】:B02.05
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:氧化物;镉;银;电触点;金属;触点;材料
【英文主题词】:cadmiumoxide;cadmium;contacts;internaloxidation;powdermetallurgy;silver-cadmiumoxide;silver;wrought
【摘要】:Silver-cadmiumoxideisapopularcontactmaterialthathasbeenusedinawiderangeofapplicationsinswitches,relaysandcontactorsforswitchinglamps,motorsandresistiveloads.Silver-cadmiumoxideisacompositematerialconsistingofametalmatrix,silver,withametaloxide,cadmiumoxide,dispersedthroughoutthematrix.Compositionsofupto30%cadmiumaremade,butmostapplicationsusesilver-cadmiumoxideintherangeof10to15%cadmiumoxidebyweight.Severaldifferentprocessesareusedformanufacturingsilver-cadmiumoxidematerialanditshouldbeunderstoodthatthemanufacturingmethodhasaninfluenceonthepropertiesofthematerialsuchasarcerosionresistance,weldingresistance,arcmobilityandcontactresistance.Sincetheperformanceofcontactsinadeviceisdependentonnumerousfactorsoutsidethecontactitself(openingspeed,closingspeed,contactpressure,contactbounceandmanymoredeviceparameters),theguidecannotensureperformanceinspecificapplications.Arcerosionresistanceandweldingresistanceareimprovedbytheadditionofcadmiumoxidetothesilvermatrix.Thecontactresistanceisraisedbythisadditionbutstillislow.Cadmiumoxideandsilverdonotalloysothesilvermatrixretainsitshighconductivity.Silver-cadmiumoxidecontactsareusedincurrentrangesofafewamperestoseveralhundredamperes.Silver-cadmiumoxidecontactmaterialisavailableaswire,silver-cladwire,sheet,strip,toplay,inlayandoverlaysheetorstrip,discretecontactparts,brazedcontactassemblies,solidandcompositerivetcontactsandcladcontacttapes.Materialswithhighercadmiumoxidecontentshavelowermaterialcostsbutmayhavehigherprocessingcostsduetolowerformability.1.1Thisguideprovidesguidelinesforusersandmanufacturersofsilver-cadmiumoxidematerialproducedinstrip,rod,wire,andpartformforelectricalcontactapplications.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.ItistheresponsibilityoftheuserofthisstandardtobecomefamiliarwithallhazardsincludingthoseidentifiedintheappropriateMaterialSafetyDataSheet(MSDS)forthisproduct/materialasprovidedbythemanufacturer,toestablishappropriatesafetyandhealthpractices,anddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H62
【国际标准分类号】:77_150_70
【页数】:5P.;A4
【正文语种】: