Designation:D6745−11(Reapproved2015)StandardTestMethodforLinearThermalExpansionofElectrodeCarbons1ThisstandardisissuedunderthefixeddesignationD6745;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthecoef-ficientoflinearthermalexpansion(CTE)forcarbonanodesandcathodesusedinthealuminumindustry,inbakedform,byuseofavitreoussilicadilatometer.1.2Theapplicabletemperaturerangeforthistestmethodforresearchpurposesisambientto1000°C.Therecom-mendedmaximumusetemperatureforproductevaluationis500°C.1.3ThistestmethodandprocedureisbasedonTestMethodE228,whichisagenericall-encompassingmethod.Specificsdictatedbythenatureofelectrodecarbonsandthepurposesforwhichtheyareusedareaddressedbythisprocedure.1.4Electrodecarbonsinthebakedformwillonlyexhibitprimarilyreversibledimensionalchangeswhenheated.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E228TestMethodforLinearThermalExpansionofSolidMaterialsWithaPush-RodDilatometer3.Terminology3.1Definitions:3.1.1linearthermalexpansion,n—thechangeinlengthperunitlengthresultingfromatemperaturechange.Linearther-malexpansionissymbolicallyrepresentedby∆L/L0,where∆Listhelengthchangeofthespecimen(L1−L0),L0andL1arethespecimenslengthsatreferencetemperatureT0andtesttemperatureT1,respectively.Linearthermalexpansionisoftenexpressedasapercentageorinpartspermillion(suchasµm/m).3.1.1.1meancoeffıcientoflinearthermalexpansion(CTE),n—Thelinearthermalexpansionperchangeintem...
