Thermal diffusivity in ceramics by laser flash method

Citation
E. Garcia et al., Thermal diffusivity in ceramics by laser flash method, B S ESP CER, 40(4), 2001, pp. 289-294
Citations number
24
Language
SPAGNOLO
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
BOLETIN DE LA SOCIEDAD ESPANOLA DE CERAMICA Y VIDRIO
ISSN journal
0366-3175 → ACNP
Volume
40
Issue
4
Year of publication
2001
Pages
289 - 294
Database
ISI
SICI code
0366-3175(200107/08)40:4<289:TDICBL>2.0.ZU;2-O
Abstract
Among the several techniques available to measure the thermal conductivity / diffusivity, the laser flash method stands out for its low run time (less than 1 hour per temperature) and the reduced sample size required. Neverth eless, the laser flash technique is not very accurate for porous materials due to laser transmission problems and the underestimation of the total sam ple thickness. The attaching to the porous sample of two thin foils of an o paque and high diffusivity material (Cu) can solve these problems. This typ e of assembly was used to measure diffusivity in a porous alumina material. Data obtained are compared with theoretical models, wich predict effective thermal conductivity of the porous material from the thermal conductivity of the dense material, the amount of porosity and the type of microstructur e.