1、BRITISH STANDARD BS EN 820-2:2003 Advanced technical ceramics Methods of testing monolithic ceramics Thermo-mechanical properties Part 2: Determination of self-loaded deformation The European Standard EN 820-2:2003 has the status of a British Standard ICS 81.060.30 BS EN 820-2:2003 This British Stan
2、dard was published under the authority of the Standards Policy and Strategy Committee on 22 April 2003 BSI 22 April 2003 ISBN 0 580 41604 6 National foreword This British Standard is the official English language version of EN 820-2:2003. It supersedes DD ENV 820-2:1992 which is withdrawn. The UK pa
3、rticipation in its preparation was entrusted to Technical Committee RPI/13, Advanced technical ceramics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement internat
4、ional or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport
5、 to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee a
6、ny enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and
7、a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN8202 April2003 ICS81.060.30 SupersedesENV8202:1992 Englishversion Advancedtechnicalc
8、eramicsMethodsoftestingmonolithic ceramicsThermomechanicalpropertiesPart2: Determinationofselfloadeddeformation CramiquestechniquesavancesMthodesdessaipour cramiquesmonolithiquesPropritsthermomcaniques Partie2:Dterminationdeladformationsoussonpropre poids HochleistungskeramikPrfverfahrenfrmonolithis
9、che KeramikThermomechanischeEigenschaftenTeil2: BestimmungderVerformungunterEigengewicht ThisEuropeanStandardwasapprovedbyCENon2January2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutany
10、alteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemb
11、erintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,
12、SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN8202:2003EEN8202:2003(E) 2
13、Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termanddefinition. .4 4 Principle4 5 Apparatus .4 6 Testpieces. .5 7 Procedure .5 7.1 Settingupofmeasurementgauge. 5 7.2 Markingofthetestpieces .5 7.3 Measurementoftestpiecesbeforeheattreatment 5 7.4 Heattreatmentoftestpieces. .5 7.5 Measur
14、ementofthetestpiecesafterheattreatment . .6 7.6 Calculationofdeformation .6 8 Determinationofthetemperatureofcommencementofselfloadeddeformation.6 8.1 Determination.6 8.2 Limits.6 9 Interferences.7 10 Testreport 7EN8202:2003(E) 3 Foreword Thisdocument(EN8202:2003)hasbeenpreparedbyTechnicalCommitteeC
15、EN/TC184“Advancedtechnical ceramics“,thesecretariatofwhichisheldbyBSI. Thisdocumentshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextorby endorsement,atthelatestbyOctober2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby October2003. ThisdocumentsupersedesEN
16、V8202:1992. EN820 AdvancedtechnicalceramicsMethodsoftestingmonolithicceramicsThermomechanicalproperties consistsoffourparts: Part 1: Determinationofflexuralstrengthatelevatedtemperatures Part 2: Determinationofselfloadeddeformation Part 3: Determinationresistancetothermalshockbywaterquenching Part 4
17、: Determinationofflexuralcreepdeformationatelevatedtemperatures AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,I
18、taly,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN8202:2003(E) 4 1 Scope ThisEuropeanStandardspecifiesamethodforthedeterminationofthetemperatureatwhichtheselfloaded deformationofaceramictestpiececommencesandtheextentofthisdeformation. 2 Normati
19、vereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropea
20、n Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN605841, ThermocouplesPart1:Referencetables(IEC605841:1995). ENISO/IEC17025,Generalrequirementsforthecompetenceoftestingandcalibrationlaboratories(ISO
21、/IEC 17025:1999). ENV1006, AdvancedtechnicalceramicsMethodsoftestingmonolithicceramicsGuidanceonthesamplingand selectionoftestpieces. 3 Termanddefinition ForthepurposesofthisEuropeanStandardthefollowingtermanddefinitionapplies. 3.1 selfloadeddeformation thepropertyinducedbyheat,whichresultsinacerami
22、cbodybeingreadilydeformedunderitsownweight 4Principle Themethodinvolvesdeterminingwhetherornottestbarssupportedonlyattheirendsdeformataseriesof temperatures,recordinganyselfloadeddeformationobserved,andrecordingtheresultsgraphically.The temperatureofcommencementofselfloadeddeformation,takenfromthegr
23、aph,isreported. Thistestisintendedasasimplemethodofdeterminingtheupperusetemperatureofceramiccomponentsina selfloadedcondition.Thecriterionisanupperlimitofflexuraldistortion.Thetestissuitableforuseonfurnace constructionmaterialsandonanyceramicmaterials,fromwhichcomponentsaresubjectedtofurtherprocess
24、ingat hightemperatures. 5Apparatus 5.1 Measurementapparatus ,ofthetypeshowninFigure1.Thedistancebetweentheknifeedgesupportsshall be160mm 0,5mm.Thegaugeformeasuringdeformation(sagorbow)shallbeaccurateto0,01mm. NOTE ThedialgaugeshowninFigure1isanexampleonly. 5.2 Steelbar,ofdimensionsasshowninFigure 2,
25、withthetopsurfaceflatto 0,01mm and parallel, to 0,01mm,totheundersurfacesintheregionsofreducedthicknesses. 5.3 Laboratoryfurnace,capableofachieving1600C,andofholdingthetemperatureuniformlyoverthearea occupiedbythetestpieces(seeFigure3)towithin 5C.Acontrolledatmosphere,otherthanair,maybeusedif requir
26、ed.Thisshallbereported(seeclause10).EN8202:2003(E) 5 5.4 Tworefractorysupports ,withsquarecrosssectionofapproximately12mm(seeFigure3),madeofmaterial whichiscompatiblewiththetestmaterialatthetesttemperature.Thesupportsshallbeinspectedaftereachfiring andwherethereisevidenceofreactionwiththetestpieces,
27、thesupportsshallbereplaced. 5.5 Thermocouples(two ),onetocontrolthefurnaceandonetomeasurethetemperatureofthetestpieces.The thermocouplesshallbeeithertypeR,typeSortypeBinaccordancewithEN605841. 6 Testpieces MaterialsfortestingshallbeselectedinaccordancewiththeguidancegiveninENV1006.Testpiecesshallbe
28、rectangularbars,withinthefollowingrangeofdimensions: a) length:173mmto177mm; b) width:11,5mmto12,5mm; c) thickness:3,9mmto4,1mm. Thetestpiecesshallbegroundflatandparallelsothatthethicknesstoleranceofasetoftestpiecesshallbe 0,02mm. NOTE1 Asetisthenumberoftestpieceswhicharerequiredforthedeterminationo
29、fthetemperatureofcommencementof selfloadeddeformation. Twopiecesarerequiredforeachdeterminationatasingletemperature.Testpiecesmaybeeithercutfromfired ceramicproductsormaybepreparedespeciallyforthismethodoftest. NOTE2 Inthelattercasetheyshouldbefiredbeforetestinginamannercomparabletoproductionfiring.
30、 7Procedure 1.1 Settingupofmeasurementgauge Checkthatthemeasurementgauge(see5.1)probeispositionedatthemidpointbetweenthetwoknifeedges,as showninFigure1.Placethesteelbar(see5.2)ontheknifeedgesandadjustthegaugetoreadzero. 7.2 Markingofthetestpieces Marktheupperfaceofoneendofthetestpiecewithrefractoryp
31、aint,asthereferenceend.Drawapencilline 8mmfromthisreferenceend,acrossthetopsurfaceofthetestpiece,toactasareferencemarkertobealigned withtheknifeedgeofthereferencegauge(see7.3).Repeattheaboveprocedureforthesecondtestpiece. 7.3 Measurementoftestpiecesbeforeheattreatment Placethetestbarinthegauge,refer
32、encefaceuppermostsothatthelineacrossthewidthofthetopsurface (see7.2)liesoveraknifeedge.Recordtheinitialgaugereading( M 1 )tothenearest0,01mmandwhetheritis positiveornegative.Repeatforthesecondtestpiecetobeincludedintheheattreatment(see7.4). 7.4 Heattreatmentoftestpieces Supportthetwotestpieces,appro
33、ximately6mmapart,onthetwosquarecrosssectionrefractorysupports(see 5.4),whicharepositioned160mm 0,5mmapartonarefractorybatt(seeFigure3).Placethetestpiecessothat thepencillinesmarkedacrossthewidthofthetestpiecesarefacingupwardsandlieovertheinsideedgeofoneof thesquarecrosssectionsupports(seeFigure3).Pl
34、acetherefractorybattwiththetestpiecesinthefurnaceand positionthemeasuringthermocouple(see5.5)adjacenttothetestpieces.Raisethetemperatureofthetestpieces inthefurnaceby300C/htothetesttemperaturewithoutexceedingit,andthenmaintainthattemperaturefor1h. Coolthefurnacetoroomtemperatureandremovethetestpiece
35、s.EN8202:2003(E) 6 NOTE Thefinaltesttemperatureshouldbeagreedbetweentheinterestedpartiesbeforethetest(seeclause8). 7.5 Measurementofthetestpiecesafterheattreatment Remeasurethetestpiecesinaccordancewiththeproceduregivenin7.2and7.3toobtainthefinalgaugereading (M 2 ). 7.6 Calculationofdeformation Thes
36、elfloadeddeformation,sagorbow,foreachtemperaturetestediscalculatedfromthefollowingexpression: Deformation= M 1 M 2 where M 1 istheinitialdialgaugereading(see7.3); M 2 isthefinaldialgaugereading(see7.5). Thedeformationshallbeexpressedinmillimetresandthenumericalmeanofthedeformationofbothtestbars subj
37、ectedtothesameheattreatmenttemperatureshallbedetermined. Reportthedeformationtothenearest0,01mmandthetesttemperaturestothenearest5C. 8 Determinationofthetemperatureofcommencementofselfloadeddeformation 8.1 Determination 8.1.1 Wheredeformationdoesnotoccuratthefirsttesttemperature,repeatthetestdescrib
38、edinclause7ata temperatureapproximately100Khigher,usingtwonewtestpiecestakenfromthesameset,andwherenecessary carryoutfurthertestsatintervalsof100 Cuntildeformationoccurs.Whenarangeof100 Coverwhich deformationoccurshasbeenestablished,carryoutfurthertestsatintervalsofapproximately50C,25Cand 12,5Cuntil
39、theintervalbetweentheobservationofnodeformationanddeformation(see8.2)isbetween10C and15C. 8.1.2 Wheredeformationoccursatthefirsttesttemperature,repeatthetestdescribedinclause 7ata temperatureapproximately100Klower,usingtwonewtestpiecestakenfromthesameset,andwherenecessary carryoutfurthertestsatinter
40、valsof100 Cuntilnodeformationoccurs.Establishtheintervalbetweenno deformationanddeformationasdescribedin8.1.1. 8.2Limits Drawagraph(seeFigure4)toshowthedeformationofthetestpiecesagainsttemperature.Usethisgraphto determineanypermanentdeformation,asshowninFigure4. NOTE Suchpermanentdeformationcanbedue
41、toirreversibleexpansion,oxidation,orreliefofresidualstressandisnot duetotheloadofthetestpiece(see9). Forthepurposeofthistest,thestateofnodeformationdescribedin8.1.1and8.1.2occurswhenthedeformation is0,03mmorless,excludingthepermanentdeformation. Reportthetemperatureofcommencementofselfloadeddeformat
42、ion,takenfromthegraphasshowninFigure4.EN8202:2003(E) 7 9Interferences Otherchangescanoccurduringthistestwhichleadtoapparentpermanentdeformation,includingpermanent densitychanges,intervalstressreliefandoxidation.Ifoxidationorpermanentdensitychangesaresuspected, checksshallbemadeontestpiecedimensionsa
43、ndreportedinthetestreport(see10i).Residualstressreliefmay showvariablepositiveornegativeapparentdeformation.Ifthisissuspected,ensuresufficienttestingisundertaken todistinguishthecorrectonsetofpermanentplasticdeformation. 10 Testreport TheresultsshallbereportedinaccordancewithENISO/IEC17025,andthetestreportshallincludethefollowing information: a) nameandaddressofthe
