Porous yttria-stabilized zirconia ceramics with ultra-low thermal conductivity |
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Authors: | LiangFa Hu Chang-An Wang Yong Huang |
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Affiliation: | (1) Department of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084, People’s Republic of China; |
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Abstract: | Porous yttria-stabilized zirconia (ZrO2-8 mol% Y2O3, YSZ) ceramics with ultra-low thermal conductivity (as low as 0.06 W/mK) could be fabricated by tert-butyl alcohol (TBA)-based
gel-casting process with low solid loadings of 10 and 15 vol%. High porosity (52–76%) and fine pores with average pore size
of 0.7–1.8 μm formed after sintering at 1350–1550 °C. These air-containing pores were believed to affect the through-thickness
heat transfer propagation, resulting in low thermal conductivity. The thermal conductivity of porous YSZ ceramics with different
porosities fits well with computed values derived from Effective Medium Theory (EMT). |
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