Flash Sintering of Nanograin Zirconia in <5 s at 850°C

Journal of the American Ceramic Society - Tập 93 Số 11 - Trang 3556-3559 - 2010
Marco Cologna1, Boriana Rashkova2, Rishi Raj1
1Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0427
2Department of Materials Physics, Erich Schmid Insitut for Materials Science, Austrian Academy of Sciences, Erich Schmid Institute of Materials Science, Jahnstrasse 12, 8700 Leoben, Austria

Tóm tắt

We show that yttrium‐stabilized zirconia can be sintered in a few seconds at ∼850°C to full density, starting from a green density of 0.5, by the application of a dc electrical field (nominally, several hours at 1450°C are needed to complete the sintering process). This finding is explained by the local Joule heating at grain boundaries, which, on the one hand, promotes grain‐boundary diffusion (a kinetic effect), while at the same time restricts grain growth (a thermodynamic effect). The smaller grain size and the higher temperature at grain boundaries can then act synergistically to enhance the rate of sintering. These results have a bearing in explaining the widespread spark plasma and microwave‐assisted techniques for enhanced sintering.

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Thông tin xuất bản

Journal of the American Ceramic Society

Tập 93 Số 11

3556-3559

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