Hauptseite > Publikationsdatenbank > Improved compaction of ZnO nano-powder triggered by the presence of acetate and its effect on sintering > print

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024 7 _ |a 10.1088/1468-6996/16/2/025008
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100 1 _ |a Dargatz, Benjamin
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245 _ _ |a Improved compaction of ZnO nano-powder triggered by the presence of acetate and its effect on sintering
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a The retention of nanocrystallinity in dense ceramic materials is still a challenge, even with the application of external pressure during sintering. The compaction behavior of high purity and acetate enriched zinc oxide (ZnO) nano-powders was investigated. It was found that acetate in combination with water plays a key role during the compaction into green bodies at moderate temperatures. Application of constant pressure resulted in a homogeneous green body with superior packing density (86% of theoretical value) at moderate temperature (85 °C) in the presence of water. In contrast, no improvement in density could be achieved if pure ZnO powder was used. This compaction behavior offers superior packing of the particles, resulting in a high relative density of the consolidated compact with negligible coarsening. Dissolution accompanying creep diffusion based matter transport is suggested to strongly support reorientation of ZnO particles towards densities beyond the theoretical limit for packing of ideal monosized spheres. Finally, the sintering trajectory reveals that grain growth is retarded compared to conventional processing up to 90% of theoretical density. Moreover, nearly no radial shrinkage was observed after sinter-forging for bodies performed with this advanced processing method.
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700 1 _ |a Gonzalez, Jesus
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700 1 _ |a Guillon, Olivier
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773 _ _ |a 10.1088/1468-6996/16/2/025008
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856 4 _ |u http://iopscience.iop.org/1468-6996/16/2/025008/
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