YS/T 412-1999 硬质合金球粒
作者:标准资料网 时间:2024-05-24 20:25:10 浏览:8059
来源:标准资料网
基本信息
| 标准名称： | 硬质合金球粒 |
| 英文名称： | Cemented carbide pellets |
| 中标分类： |
冶金 >>
粉末冶金 >>
粉末冶金材料与制品 |
| ICS分类： |
冶金 >>
粉末冶金
|
| 发布部门： | 国家有色金属工业局 |
| 发布日期： | 1999-11-17 |
| 实施日期： | 2000-06-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 1900-01-01 |
| 提出单位： | 中国有色金属工业标准计量质量研究所 |
| 归口单位： | 中国有色金属工业标准计量质量研究所 |
| 起草单位： | 自贡硬质合金有限责任公司 |
| 起草人： | 周明智、罗达成 |
| 出版社： | 中国标准出版社 |
| 出版日期： | 2000-06-01 |
| 页数： | 5页 |
| 书号： | 155066.2-12935 |
适用范围
本标准规定了硬质合金球粒的要求、检验规则、试验方法及标志、包装、运输、贮存。
本标准适用于用作耐磨材料的硬质合金球粒。
前言
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目录
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引用标准
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所属分类： 冶金 粉末冶金 粉末冶金材料与制品 冶金 粉末冶金
MIL-P-85582 (INTERIM AMENDMENT 1), MILITARY SPECIFICATION: PRIMER COATINGS: EPOXY, WATERBORNE (26 SEP 1985) [S/S BY MIL-PRF-85582C].【英文标准名称】:StandardTestMethodforAirPermeabilityofTextileFabrics
【原文标准名称】:纺织纤维透气率的标准试验方法
【标准号】:ASTMD737-2004(2008)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2004
【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】:D13.59
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:airpermeability;fabric;Airbagmaterials/applications;Airpermeance/permeability;Blankets;Heavily-sizedtextilefabrics;Knittedtextilefabrics;Nappedfabrics;Nonwoventextilefabrics;Pilefabrics;Resin-treatedtextilefabrics;Textilefabrics
【摘要】:Thistestmethodisconsideredsatisfactoryforacceptancetestingofcommercialshipmentssincecurrentestimatesofbetween-laboratoryprecisionareacceptable,andthistestmethodisusedextensivelyinthetradeforacceptancetesting.Iftherearedifferencesofpracticalsignificancebetweenreportedtestresultsfortwolaboratories(ormore),comparativetestsshouldbeperformedtodetermineifthereisastatisticalbiasbetweenthem,usingcompetentstatisticalassistance.Asaminimum,ensurethetestsamplestobeusedareashomogeneousaspossible,aredrawnfromthematerialfromwhichthedisparatetestresultswereobtained,andarerandomlyassignedinequalnumbertoeachlaboratoryfortesting.Thetestresultsfromthetwolaboratoriesshouldbecomparedusingastatisticaltestforunpaireddata,ataprobabilitylevelchosenpriortothetestingseries.Ifbiasisfound,eitheritscausemustbefoundandcorrected,orfuturetestresultsforthatmaterialmustbeadjustedinconsiderationoftheknownbias.Airpermeabilityisanimportantfactorintheperformanceofsuchtextilematerialsasgasfilters,fabricsforairbags,clothing,mosquitonetting,parachutes,sails,tentage,andvacuumcleaners.Infiltration,forexample,efficiencyisdirectlyrelatedtoairpermeability.Airpermeabilityalsocanbeusedtoprovideanindicationofthebreathabilityofweather-resistantandrainprooffabrics,orofcoatedfabricsingeneral,andtodetectchangesduringthemanufacturingprocess.Performancespecifications,bothindustrialandmilitary,havebeenpreparedonthebasisofairpermeabilityandareusedinthepurchaseoffabricswherepermeabilityisofinterest.Constructionfactorsandfinishingtechniquescanhaveanappreciableeffectuponairpermeabilitybycausingachangeinthelengthofairflowpathsthroughafabric.Hotcalendaringcanbeusedtoflattenfabriccomponents,thusreducingairpermeability.Fabricswithdifferentsurfacetexturesoneithersidecanhaveadifferentairpermeabilitydependinguponthedirectionofairflow.Forwovenfabric,yarntwistalsoisimportant.Astwistincreases,thecircularityanddensityoftheyarnincreases,thusreducingtheyarndiameterandthecoverfactorandincreasingtheairpermeability.Yarncrimpandweaveinfluencetheshapeandareaoftheintersticesbetweenyarnsandmaypermityarnstoextendeasily.Suchyarnextensionwouldopenupthefabric,increasethefreearea,andincreasetheairpermeability.Increasingyarntwistalsomayallowthemorecircular,high-densityyarnstobepackedcloselytogetherinatightlywovenstructurewithreducedairpermeability.Forexample,aworstedgabardinefabricmayhavelowerairpermeabilitythanawoolenhopsackingfabric.1.1Thistestmethodcoversthemeasurementoftheairpermeabilityoftextilefabrics.1.2Thistestmethodappliestomostfabricsincludingwovenfabrics,nonwovenfabrics,airbagfabrics,blankets,nappedfabrics,knittedfabrics,layeredfabrics,andpilefabrics.Thefabricsmaybeuntreated,heavilysized,coated,resin-treated,orotherwisetreated.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesstatedininch-poundunitsmaybeapproximate.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:W04
【国际标准分类号】:59_080_30
【页数】:5P.;A4
【正文语种】:英语
