ISO 18755:2022
(Main)Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of thermal diffusivity of monolithic ceramics by flash method
Fine ceramics (advanced ceramics, advanced technical ceramics) — Determination of thermal diffusivity of monolithic ceramics by flash method
This document specifies the test method for the determination of thermal diffusivity from room temperature to at least 1 700 K by the flash method for homogeneous monolithic ceramics with porosity less than 10 %. Flash methods, like laser flash, are applicable to homogeneous isotropic materials with thermal diffusivity values ranging from 0,1 to 1 000 mm2 s-1 within the temperature range from approximately 100 K to 2 300 K. The method described in Annex G describes how to estimate, on the basis of the thermal diffusivity test, the specific heat capacity and the thermal conductivity of homogeneous monolithic ceramics with porosity less than 10 %.
Céramiques techniques — Détermination de la diffusivité thermique des céramiques monolithiques par la méthode flash
Le présent document spécifie la méthode d’essai pour la détermination de la diffusivité thermique de la température ambiante à au moins 1 700 K par la méthode flash pour les céramiques monolithiques homogènes dont la porosité est inférieure à 10 %. Les méthodes flash, telles que flash laser, sont applicables aux matériaux isotropes homogènes dont les valeurs de diffusivité thermique sont comprises entre 0,1 mm2 s–1 et 1 000 mm2 s–1 dans une plage de températures allant d’environ 100 K à 2 300 K. La méthode décrite à l’Annexe G décrit comment estimer, à partir de l’essai de diffusivité thermique, la capacité thermique massique et la conductivité thermique des céramiques monolithiques homogènes dont la porosité est inférieure à 10 %.
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 18755
Second edition
2022-12
Fine ceramics (advanced ceramics,
advanced technical ceramics) —
Determination of thermal diffusivity
of monolithic ceramics by flash
method
Céramiques techniques — Détermination de la diffusivité thermique
des céramiques monolithiques par la méthode flash
Reference number
ISO 18755:2022(E)
© ISO 2022
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ISO 18755:2022(E)
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Published in Switzerland
ii
© ISO 2022 – All rights reserved
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ISO 18755:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 3
4.1 General . 3
4.2 Specimen holder . 4
4.3 Flash source . 4
4.4 Thermometer for measuring steady-state temperature of the specimen . 5
4.5 Detector for measuring transient temperature rise of rear face of the specimen . 5
4.6 Environment for measurements . . 5
4.7 Temperature control unit . 5
4.8 Data acquisition unit . 5
5 Specimen . 5
5.1 Shape and dimension of specimens . 5
5.2 Density of the specimen . 6
5.3 Coating on the specimen . 6
5.4 Reference specimen . 6
6 Measurement procedure . 6
6.1 Measurement of specimen thickness .
...
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