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BS EN ISO 18755:2023

BS EN ISO 18755:2023

$189.07

Fine ceramics (advanced ceramics, advanced technical ceramics). Determination of thermal diffusivity of monolithic ceramics by flash method

Published By Publication Date Number of Pages
BSI 2023 50
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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 sĀ­1 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 %.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
9 4 Apparatus
4.1 General
10 4.2 Specimen holder
4.3 Flash source
11 4.4 Thermometer for measuring steady-state temperature of the specimen
4.5 Detector for measuring transient temperature rise of rear face of the specimen
4.6 Environment for measurements
4.7 Temperature control unit
4.8 Data acquisition unit
5 Specimen
5.1 Shape and dimension of specimens
12 5.2 Density of the specimen
5.3 Coating on the specimen
5.4 Reference specimen
6 Measurement procedure
6.1 Measurement of specimen thickness
6.2 Surface treatment
13 6.3 Determination of the flash time of the laser or light pulse and the chronological profile of the laser or light pulse
6.4 Temperature and atmosphere control
6.5 Stability of specimen temperature
6.6 Energy of pulse heating
6.7 Measurement temperature
6.8 Record
7 Data analysis
7.1 Calculation based on the half-rise-time method
14 7.2 Criteria for applicability of the half-rise-time method
16 8 Measurement report
19 Annex A (informative) Principle of flash thermal diffusivity measurements
20 Annex B (normative) Correction for non-ideal initial and boundary conditions
27 Annex C (informative) Data analysis algorithms to calculate thermal diffusivity from observed transient temperature curve under non-ideal initial and boundary conditions
29 Annex D (informative) Other error factors
35 Annex E (informative) Procedure to determine intrinsic thermal diffusivity
38 Annex F (informative) Reference data and reference materials of thermal diffusivity
40 Annex G (informative) Evaluation of specific heat capacity and thermal conductivity
42 Annex H (informative) Example data including precision and uncertainty up to high temperature
45 Bibliography

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BS EN ISO 18755:2023
$189.07