MIL-STD-1602 (NOTICE 1), MILITARY STANDARD: PROGRESS REPORTS FOR RESEARCH AND DEVELOPMENT EQUIPMENT, REQUIREMENTS FOR (17 JUL 1981) [NO S/S DOCUMENT]., MIL-STD-1602 (AS) dated 8 June 1973, is hereby canceled.【英文标准名称】:StandardTestMethodsforThicknessofDiffusionCoating
【原文标准名称】:扩散层厚度的的标准试验方法
【标准号】:ASTMC664-1987(2005)
【标准状态】:现行
【国别】:
【发布日期】:1987
【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】:B08.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:扩散;厚度;覆层;试验
【英文主题词】:
【摘要】:Adiffusioncoatingisoneproducedbycausinganelementorelementstoreactwithordiffuseinto,orboth,thesurfaceofametallicsubstrate,thuschemicallyalteringthesubstrateadjacenttothesurface.Toappreciatethesignificanceofcoatingthicknessmeasurementsonemustunderstandthecontributionstoaparticularcoatingofsolid-solutionzonesinthesubstrateandreactionproductssuchasintermetalliccompounds.1.1Thesetestmethodscovertwoproceduresformeasuringthethicknessofdiffusioncoatings.1.2TestMethodAisthedeterminationofthedimensional-changethickness,definedasthedifferenceinthethicknessofthepartbeforeandaftercoating.(Thetermsmicrometerthicknessandpartgrowthareconsideredsynonymouswithdimensionalchangethickness.)1.3TestMethodBisthedeterminationoftotalcoatingthickness,definedasthedistancebetweentheobservablyunaffectedsubstrateandtheexteriorsurfaceofthecoating.Thisincludesthetotalofallincludedphases,zonesandlayers.(Thetermcasedepthisconsideredtobesynonymouswithtotalcoatingthickness.)Thetotalcoatingthicknessisdeterminedbycross-sectioningthecoating,preparingametallurgicalmountandmicroscopicallymeasuringthecoatingthickness.1.4Thetotalcoatingthicknessasdeterminedmicroscopicallyfromacross-sectionwillusuallybegreaterthan,orequalto,thedimensionalchangethicknessdeterminedbypartgrowth.Whenthecoatingisproducedprimarilybyreactionwiththesubstrate,thesubstrate-coatinginterfacerecedesasthesubstrateisconsumedinthereaction.Insuchcasesthedifferencebetweenthetotalcoatingthicknessandthedimensionalchangethicknessisthethicknessofthesubstrateconsumed.1.5Diffusioncoatingsareusuallyformedatelevatedtemperaturesforserviceatelevatedtemperatures.Thismeansthatdiffusioncoatingsaredynamicsystemswhicharecontinuallyundergoingchangeswhileinanelevated-temperatureenvironment.Itisnecessarytoknowthatcertainphasesaregrowingattheexpenseofothersandtoknowtheprevioushistoryofacoatingtounderstandthesignificanceofcoatingthicknessdata.1.6ValuesinSIunitsaretoberegardedasthestandard.Inch-poundunitsareprovidedforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A52
【国际标准分类号】:17_040_20
【页数】:2P.;A4
【正文语种】: