EN 1159-2:2003
(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 à matrice céramique renforcée de fibres continues.
Les conditions expérimentales sont telles que le matériau se comporte de manière homogène 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.
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Advanced technical ceramics - Ceramic composites - Thermophysical properties - Part 2: Determination of thermal diffusivity
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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
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
Uni-dimensional thermal model.11Bibliography.13SIST EN 1159-2:2004
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 the size of the specimen shall be increased.The infrared detector, when used, shall be of a type appropriate to the minimum test piece temperature, forexample:a) Hg/Cd/Te cell, liquid nitrogen cooled, for test specimen temperatures within the range 300 K to 800 K ;b) PbS cell for test specimen temperatures above 500 K.Care shall be taken that the signal comes only from the central area of the back face, that is with a toleranceof 5 % of the diameter of the test specimen.Thermocouples, when used, shall be of the separated junction type, the hot junction being the back face of thetest piece. They shall be in accordance with EN 60584-1. Electrically non-conductive material shall be coatedon the front face and on the rear face, with a thin coating of high thermal conductivity material in order toensure accurate measurement of surface temperatures.NOTE 1In order to minimize heat losses, the use of the thermocouples with wires of the smallest possible diameter isrecommended.NOTE 2The thermocouple type most often used is chromel-alumel for measurements from room temperature up to 1100 K. Semi-conducting couples may also be used: Bi2Te3 from 90 K to 400 K and FeSi2 for temperatures up to 1 100 K.For temperatures over 1 100 K, a non-contact measurement technique is recommended.5.4 Data acquisitionThe data acquisition system used may be analogue or digital. It shall be equipped with means of recording thetemperature change versus time (before, during and after the pulse) and the time origin. These means shallbe accurate to within 0,02 ms.6 Test specimensThe size of the test specimens shall be fixed to meet the requirements for application of the chosen thermalmodel (for example like the one described in annex A). Generally a disc of a diameter between 8 mm and 25mm is used.The thickness of the specimen shall be sufficient in order to avoid influence of material homogeneity. Thisshall be ensured by performing tests on two series of test specimens with a thickness ratio of about 2.Recommended starting thicknesses are between 1 mm and 10 mm. Homogeneous material behaviour can beassumed when the mean values of the thermal diffusivity determined from each series do not differ by morethan 10 %.SIST EN 1159-2:2004
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