Porosity and pore size distribution influence on thermal conductivity of yttria-stabilized zirconia: Experimental findings and model predictions
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- 作者：Giorgio Pia ; giorgio.pia@dimcm.unica.it" class="auth_mail" title="E-mail the corresponding author ; Ludovica Casnedi ; Ulrico Sanna
- 关键词：Advanced porous ceramics ; Fractal model ; Thermal conductivity predictions ; Pore size distribution ; Yttria-stabilized zirconia
- 刊名：Ceramics International
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：42
- 期：5
- 页码：5802-5809
- 全文大小：2694 K
文摘
Porous yittria-stabilized zirconia is an important advanced ceramic material for technological applications. One of the most important characteristics of this material is low thermal conductivity, which is greatly influenced by the presence of pores into the microstructure. In fact, air trapped in the pores represents a better thermal insulator. The role of the pore volume fraction on porous material characteristics has been extensively studied. On the other hand, the influence of the structure disorder, the pore size range and pore size distribution have been studied much less. In this study, an intermingled fractal model capable of relating thermal properties of ceramic materials and their pore microstructure has been proposed. Model predictions are found confirming the experimental data fairly well, even better than the others models available in the literature.