基本信息
| 标准名称： | TC16钛合金光杆公差带f9的90°沉头螺栓 |
| 英文名称： | 90°countersunk head bolts shank tolerance f9 in titanium alloy |
| 中标分类： |
航空、航天 >>
航空器与航天器零部件 >>
紧固件 |
| 发布日期： | 2003-02-24 |
| 实施日期： | 2003-02-24 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 出版日期： | 1900-01-01 |
| 页数： | 8页 |
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所属分类： 航空 航天 航空器与航天器零部件 紧固件
【英文标准名称】:StandardTestMethodforMicrovacuumSamplingandIndirectAnalysisofDustbyTransmissionElectronMicroscopyforAsbestosStructureNumberSurfaceLoading
【原文标准名称】:用石棉结构值表面负荷用透射电子显微镜对尘埃微真空取样和间接分析的标准试验方法
【标准号】:ASTMD5755-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D22.07
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:asbestos;microvacuuming;settleddust;TEM;Microscopicexamination--atmospheric;Microvacuumsampling;Morphology;Samplingair/atmosphericmaterials/applications;Selectedareaelectrondiffraction(SAED);Settleddust;TEM(transmissionelectronmi
【摘要】:Thismicrovacuumsamplingandindirectanalysismethodisusedforthegeneraltestingofnon-airbornedustsamplesforasbestos.Itisusedtoassistintheevaluationofdustthatmaybefoundonsurfacesinbuildingssuchasceilingtiles,shelving,electricalcomponents,ductwork,carpet,etc.ThistestmethodprovidesanindexofthesurfaceloadingofasbestosstructuresinthedustperunitareaanalyzedasderivedfromaquantitativeTEManalysis.Thistestmethoddoesnotdescribeproceduresortechniquesrequiredtoevaluatethesafetyorhabitabilityofbuildingswithasbestos-containingmaterials,orcompliancewithfederal,state,orlocalregulationsorstatutes.Itistheuser''sresponsibilitytomakethesedeterminations.Atpresent,norelationshiphasbeenestablishedbetweenasbestos-containingdustasmeasuredbythistestmethodandpotentialhumanexposuretoairborneasbestos.Accordingly,theusersshouldconsiderotheravailableinformationintheirinterpretationofthedataobtainedfromthistestmethod.Thisdefinitionofdustacceptsallparticlessmallenoughtopassthrougha1mm(No.18)screen.Thus,asingle,largeasbestoscontainingparticle(s)(fromthelargeendoftheparticlesizedistribution)dispersedduringsamplepreparationmayresultinanomalouslylargeasbestossurfaceloadingresultsintheTEManalysesofthatsample.Itis,therefore,recommendedthatmultipleindependentsamplesaresecuredfromthesamearea,andthataminimumofthreesamplesbeanalyzedbytheentireprocedure.1.1Thistestmethodcoversaprocedureto(a)identifyasbestosindustand(b)provideanestimateofthesurfaceloadingofasbestosinthesampleddustreportedasthenumberofasbestosstructuresperunitareaofsampledsurface.1.1.1Ifanestimateoftheasbestosmassistobedetermined,theuserisreferredtoTestMethodD5756.1.2Thistestmethoddescribestheequipmentandproceduresnecessaryforsampling,byamicrovacuumtechnique,non-airbornedustforlevelsofasbestosstructures.Thenon-airbornesampleiscollectedinsideastandardfiltermembranecassettefromthesamplingofasurfaceareafordustwhichmaycontainasbestos.1.2.1Thisprocedureusesamicrovacuumingsamplingtechnique.Thecollectionefficiencyofthistechniqueisunknownandwillvaryamongsubstrates.Propertiesinfluencingcollectionefficiencyincludesurfacetexture,adhesiveness,electrostaticpropertiesandotherfactors.1.3Asbestosidentifiedbytransmissionelectronmicroscopy(TEM)isbasedonmorphology,selectedareaelectrondiffraction(SAED),andenergydispersiveX-rayanalysis(EDXA).Someinformationaboutstructuresizeisalsodetermined.1.4Thistestmethodisgenerallyapplicableforanestimateofthesurfaceloadingofasbestosstructuresstartingfromapproximately1000asbestosstructurespersquarecentimetre.1.4.1Theprocedureoutlinedinthistestmethodemploysanindirectsamplepreparationtechnique.Itisintendedtodisperseaggregatedasbestosintofundamentalfibrils,fiberbundles,clusters,ormatricesthatcanbemoreaccuratelyquantifiedbytransmissionelectronmicroscopy.However,aswithallindirectsamplepreparationtechniques,theasbestosobservedforquantificationmaynotrepresentthephysicalformoftheasbestosassampled.Morespecifically,theproceduredescribedneithercreatesnordestroysasbestos,butitmayalterthephysicalformofthemineralfibers.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.......
【中国标准分类号】:C51
【国际标准分类号】:13_040_20
【页数】:14P.;A4
【正文语种】:英语