Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 10, Pages 11674-11681Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.04.078
Keywords
Yttria-stabilized zirconia; Pore size distribution; Porous materials; Thermal conductivity; Modelling
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High porous yttria stabilized zirconia with unidirectionally aligned channels is used in engineering applications with extremely low thermal conductivity. This property is strongly influenced by microstructure features such as pore volume fraction, pore size distribution, random porous microstructure and pore morphology directionality. Although several models are reported in the available literature, but their analytical formulas are formalised for homogeneous structures or they are based on proportion between solid and fluid phases. These differences from real microstructures cause significant computational errors especially when thermal conductivity changes as the function of the measurement direction (parallel or perpendicular). In this context, the application of an intermingled fractal unit's procedure capable of reproducing porous microstructure as well as predicting thermal conductivity has been proposed. The results are in agreement with experimental ones measured for parallel and perpendicular directions and suggest improving the formalisation of fractal modelling in order to obtain an instrument of microstructure design. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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