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【英文标准名称】:StandardGuideforMetallographicPreparationofThermalSprayedCoatings
【原文标准名称】:热喷涂层的金相制备用标准指南
【标准号】:ASTME1920-2003
【标准状态】:现行
【国别】:
【发布日期】:2003
【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】:E04.01
【标准类型】:(Guide)
【标准水平】:()
【中文主题词】:热喷涂;表面处理;金属喷镀;金相学;机械工程
【英文主题词】:flamespray;flamesprayedcoating;highvelocityoxy-fuelcoatings;HVOFcoatings;metallography;plasmaspray;plasmasprayedcoatings;specimenpreparation,metallographic;thermalsprayedcoatings;thermalspray
【摘要】:TSCsareusedinanumberofcriticalindustrialcomponents.TSCscanbeexpectedtocontainmeasurablelevelsofporosityandlineardetachment.Accurateandconsistentevaluationofspecimensisessentialtoensuretheintegrityofthecoatingandproperadherencetothesubstrate.4.1.1Example1:Byuseofinappropriatemetallographicmethods,theapparentamountofporosityandlineardetachmentdisplayedbyagivenspecimencanbeincreased,byexcessiveedgerounding,ordecreasedbysmearingofmaterialintovoids.Thereforeinaccuratelevelsofporosityandlineardetachmentwillbereportedevenwhentheaccuracyofthemeasurementtechniqueisacceptable.4.1.2Example2:Inconsistentmetallographicpreparationmethodscancausetheapparentamountofvoidstovaryexcessivelyindicatingapoorlycontrolledthermalsprayprocess,whiletheuseofconsistentpracticewillregularlydisplaythetruemicrostructureandverifytheconsistencyofthethermalsprayprocess.DuringthedevelopmentofTSCprocedures,metallographicinformationisnecessarytovalidatetheefficacyofaspecificapplication.Crosssectionsareusuallytakenperpendiculartothelongaxisofthespecimenandpreparedtorevealinformationconcerningthefollowing:4.3.1Variationsinstructurefromsurfacetosubstrate,4.3.2Thedistributionofunmeltedparticlesthroughoutthecoating,4.3.3Thedistributionoflineardetachmentthroughoutthecoating,4.3.4Thedistributionofporositythroughoutthecoating,4.3.5Thepresenceofcontaminationwithinthecoating,4.3.6Thethicknessofthecoating(topcoatandbondcoat,whereapplicable),4.3.7Thepresenceofinterfacialcontamination,4.3.8Theintegrityoftheinterfacebetweenthecoatingandsubstrate,and,4.3.9Theintegrityofthecoatingmicrostructurewithrespecttochemistry.1.1Thisguidecoversrecommendationsforsectioning,cleaning,mounting,grinding,andpolishingtorevealthemicrostructuralfeaturesofthermalsprayedcoatings(TSCs)andthesubstratestowhichtheyareappliedwhenexaminedmicroscopically.Becauseofthediversityofavailableequipment,thewidevarietyofcoatingandsubstratecombinations,andthesensitivityofthesespecimenstopreparationtechnique,theexistenceofaseriesofrecommendedmethodsformetallographicpreparationofthermalsprayedcoatingspecimensishelpful.Adherencetothisguidewillprovidepractitionerswithconsistentandreproducibleresults.AdditionalinformationconcerningstandardpracticesformetallographicpreparationcanbefoundinPracticeE3.Thisstandardsdoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A29
【国际标准分类号】:25_220_20
【页数】:5P.;A4
【正文语种】: