Designation:E1920−03(Reapproved2014)StandardGuideforMetallographicPreparationofThermalSprayedCoatings1ThisstandardisissuedunderthefixeddesignationE1920;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversrecommendationsforsectioning,cleaning,mounting,grinding,andpolishingtorevealthemicrostructuralfeaturesofthermalsprayedcoatings(TSCs)andthesubstratestowhichtheyareappliedwhenexaminedmicroscopically.Becauseofthediversityofavailableequipment,thewidevarietyofcoatingandsubstratecombinations,andthesensitivityofthesespecimenstoprepa-rationtechnique,theexistenceofaseriesofrecommendedmethodsformetallographicpreparationofthermalsprayedcoatingspecimensishelpful.Adherencetothisguidewillprovidepractitionerswithconsistentandreproducibleresults.Additionalinformationconcerningstandardpracticesformet-allographicpreparationcanbefoundinPracticeE3.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E3GuideforPreparationofMetallographicSpecimensE7TerminologyRelatingtoMetallography3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthisguide,seeTerminologyE7.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1lineardetachment,n—aregionwithinaTSCinwhichtwosuccessivelydepositedsplatsofcoatingmaterialhavenotmetallurgicallybonded.3.2.2splat,n—anindividualglobuleofthermalsprayedmaterialthathasbeendepositedonasubstrate.3.2.3tapermount,n—ametallographicspecimencreatedbymountingafeature,typicallyaninterfaceorthincoating,atasmallangletothepolishingplane,suchthatthevisiblewidthexhibitedbythefeatureisexpanded.3.2.4TSC,n—thermalsprayedcoati...
