Designation:C1212−98(Reapproved2015)StandardPracticeforFabricatingCeramicReferenceSpecimensContainingSeededVoids1ThisstandardisissuedunderthefixeddesignationC1212;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesproceduresforfabricatingbothgreenandsinteredtestbarsofsiliconcarbideandsiliconnitridecontainingbothinternalandsurfacevoidsatprescribedlocations.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B311TestMethodforDensityofPowderMetallurgy(PM)MaterialsContainingLessThanTwoPercentPorosityC373TestMethodforWaterAbsorption,BulkDensity,ApparentPorosity,andApparentSpecificGravityofFiredWhitewareProducts,CeramicTiles,andGlassTiles3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1greenspecimen—aceramicspecimenformedasorigi-nallycompactedpriortohigh-temperaturedensification.3.1.2internalvoid—acavityinaspecimenwithnoconnec-tiontotheexternalsurface.3.1.3seededvoids—intentionallyplaceddiscontinuitiesatprescribedlocationsinreferencespecimens.3.1.4sinteredspecimen—formedceramicspecimenafterfiringtodensifyandremovesolventsorbinders.3.1.5surfacevoid—apitorcavityconnectedtotheexternalsurfaceofaspecimen.4.SignificanceandUse4.1Thispracticedescribesamethodoffabricatingknowndiscontinuitiesinaceramicspecimen.Suchspecimensareneededandusedinnondestructiveexaminationtodemonstratesensitivityandresolutionandtoassistinestablishingproperexaminationparameters.5.Apparatus5.1Aeroduster,moisture-free.5.2Die,ca...
