SIST EN 1159-2:2004
(Main)Advanced technical ceramics - Ceramic composites - Thermophysical properties - Part 2: Determination of thermal diffusivity
Advanced technical ceramics - Ceramic composites - Thermophysical properties - Part 2: Determination of thermal diffusivity
This part of EN 1159 describes the laser flash method for the determination of thermal diffusivity of ceramic matrix composites with continuous reinforcements (1D, 2D, 3D). The experimental conditions are such that the material behaves in an homogeneous manner for each of its axes of anisotropy and that the heat transfer occurs only by thermal conduction. The method is applicable to materials which are physically and chemically stable during the measurement, and covers the range of temperature between 100 K and 2 800 K.
Hochleistungskeramik - Keramische Verbundwerkstoffe - Thermophysikalische Eigenschaften - Teil 2: Bestimmung der Temperaturleitfähigkeit
In diesem Teil der prEN 1159 ist das Laser-Flash-Verfahren zur Bestimmung der Temperaturleitfähigkeit von keramischen Verbundwerkstoffen mit Faserverstärkung (1D, 2D, 3D) festgelegt. Die Prüfbedingungen sind so zu gestalten, daß sich der Werkstoff entlang jeder seiner Anisotropieachsen homogen verhält und daß die Wärmeübertragung nur durch Wärmeleitung stattfindet. Das Verfahren ist bei Werkstoffen einsetzbar, die sich während der Messung chemisch und physikalisch nicht verändern.
Céramiques techniques avancées - Céramiques composites - Propriétés thermophysiques - Partie 2: Détermination de la diffusivité thermique
La présente partie de l'EN 1159 décrit la méthode par flash laser permettant de déterminer la diffusivité thermique des composites a matrice céramique renforcée de fibres continues.
Les conditions expérimentales sont telles que le matériau se comporte de maniere homogene dans chacun de ses axes d'anisotropie et que le transfert de chaleur ne se produit que par conduction thermique.
Cette méthode s'applique aux matériaux qui sont physiquement et chimiquement stables pendant le mesurage et couvre le domaine de température compris entre 100 K et 2 800 K. Elle permet de mesurer des valeurs de diffusivité thermique dans la plage comprise entre 10-4 m2 s-1 et 10-7 m2 s-1.
.
Advanced technical ceramics - Ceramic composites - Thermophysical properties - Part 2: Determination of thermal diffusivity
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Advanced technical ceramics - Ceramic composites - Thermophysical properties - Part 2: Determination of thermal diffusivityHochleistungskeramik - Keramische Verbundwerkstoffe - Thermophysikalische Eigenschaften - Teil 2: Bestimmung der TemperaturleitfähigkeitCéramiques techniques avancées - Céramiques composites - Propriétés thermophysiques - Partie 2: Détermination de la diffusivité thermiqueAdvanced technical ceramics - Ceramic composites - Thermophysical properties - Part 2: Determination of thermal diffusivity81.060.30Sodobna keramikaAdvanced ceramicsICS:Ta slovenski standard je istoveten z:EN 1159-2:2003SIST EN 1159-2:2004en01-januar-2004SIST EN 1159-2:2004SLOVENSKI
STANDARDSIST ENV 1159-2:20001DGRPHãþD
SIST EN 1159-2:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1159-2September 2003ICS 81.060.30Supersedes ENV 1159-2:1993English versionAdvanced technical ceramics - Ceramic composites -Thermophysical properties - Part 2: Determination of thermaldiffusivityCéramiques techniques avancées - Céramiquescomposites - Propriétés thermophysiques - Partie 2:Détermination de la diffusivité thermiqueHochleistungskeramik - Keramische Verbundwerkstoffe -Thermophysikalische Eigenschaften - Teil 2: Bestimmungder TemperaturleitfähigkeitThis European Standard was approved by CEN on 1 August 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1159-2:2003 ESIST EN 1159-2:2004
EN 1159-2:2003 (E)2ContentsPageForeword.31Scope.42Normative references.43Terms and definitions.44Principle.45Apparatus.55.1Heat pulse source.55.2Test chamber.55.3Detectors.55.3.1Measurement of absolute temperature.55.3.2Transient detectors.55.4Data acquisition.66Test specimens.67Test specimen preparation.77.1Machining and preparation.77.2Number of test specimens.78Procedure.78.1Calibration of apparatus.78.2Procedure.79Results.810Test report.8Annex A (informative)
Uni-dimensional thermal model.11Bibliography.13SIST EN 1159-2:2004
EN 1159-2:2003 (E)3ForewordThis document (EN 1159-2:2003) has been prepared by Technical Committee CEN/TC 184 “Advancedtechnical ceramics”, the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by March 2004, and conflicting national standards shall be withdrawn atthe latest by March 2004.EN 1159 consists of four parts :¾ Part 1 : Determination of thermal expansion¾ Part 2 : Determination of thermal diffusivity¾ Part 3: Determination of specific heat capacity¾ Part 4: Determination of thermal conductivityAnnex A is informative.The document supersedes ENV 1159-2:1993.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 1159-2:2004
EN 1159-2:2003 (E)41 ScopeThis part of EN 1159 describes the laser flash method for the determination of thermal diffusivity of ceramicmatrix composites with continuous fibre reinforcement.The experimental conditions are such that the material behaves in an homogeneous manner for each of itsaxes of anisotropy and that the heat transfer occurs only by thermal conduction.The method is applicable to materials which are physically and chemically stable during the measurement,and covers the range of temperature between 100 K and 2 800 K. It is suitable for the measurement ofthermal diffusivity values in the range between 10-4 m2 s-1 and 10-7 m2 s-1.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications.These normative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications apply tothis European Standard only when incorporated in it by amendment or revision. For undated references thelatest edition of the publication referred to applies (including amendments).ENV 843-5, Advanced technical ceramics — Monolithic ceramics — Mechanical tests at room temperature —Part 5 : Statistical analysis.ENV 13233, Advanced technical ceramics — Ceramic composites — Notations and symbols.EN 60584-1, Thermocouples — Part 1: Reference tables (IEC 60584-1:1995).ISO 3611, Micrometer callipers for external measurement.3 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in ENV 13233 and the followingapply.3.1thermal diffusivity, aratio of the thermal conductivity to the product of the bulk density and the specific heat capacity3.2transient half time, t1/2time from the initiation of the pulse until the increase of the temperature on the back face of the test specimenreaches one half of the maximum temperature increase3.3thickness, hdimension of the test specimen in the direction of heat transfer measurement4 PrincipleOne side of a plane and parallel test piece is exposed to a uniformly distributed energy pulse that is of veryshort duration compared to the transient half time.SIST EN 1159-2:2004
EN 1159-2:2003 (E)5The transient temperature rise (DT) on the opposite face (back face) or a quantity directly proportional to DT isrecorded as a function of time (t) (see Figure 1).The thermal diffusivity is obtained by comparing the experimental thermogram with a theoretical model, whichis a unidimensional analytical thermal model, with two parameters, as described in annex A. If other modelsare used, they are to be specified in the test report.5 Apparatus5.1 Heat pulse sourceThe heat pulse source may be a flash tube or a pulse laser.The pulse energy shall be as uniform as possible over the front face of the test piece.5.2 Test chamberThe test chamber shall be either a furnace or a cryostat, capable of operation within the temperature rangerequired, or a draught proof enclosure for ambient temperature measurement.The design of the furnace shall meet the following requirements:a) it shall contain a working area in which the spatial temperature gradient is sufficiently low (£ 5 K) to resultin a homogeneous temperature on the test piece ;b) in steady state conditions, the drift in temperature shall be less than 0,01 K/s ;c) the heat pulse source may be placed either inside the furnace or outside the furnace; in that case, thefurnace shall be fitted with a window, transparent to the pulse radiation ;d) the furnace shall provide suitable access for measurement of DT or a quantity directly proportional to DTon the back face of the test piece.NOTE 1Measurement under vacuum will reduce convection losses.NOTE 2When the test is performed under gas, the test piece should be in a horizontal position in order to reduceconvection effects of the gas on the specimen.5.3 Detectors5.3.1 Measurement of absolute temperatureThe temperature of the test piece shall be measured either with a thermocouple (in accordance with EN60584-1) or with an optical pyrometer.5.3.2 Transient detectorsThe detector shall be either an infrared detector, a thermocouple or any other means that does not disturb themeasurement of the transient response of the specimen. It shall be capable of detecting changes of 0,05 K inthe temperature of the test piece, with a linear response over the range of temperature change less than orequal to 5 K.SIST EN 1159-2:2004
EN 1159-2:2003 (E)6It shall have a response time :td £ 0,002 h2 / awheretdis the response time, in second, (s)his the thickness,
in metre, (m)ais the thermal diffusivity, in square metres per second (m2.s-1)This condition shall be verified afterwards and if it is not met
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.