Improved compaction of ZnO nano-powder triggered by the presence of acetate and its effect on sintering.
Improved compaction of ZnO nano-powder triggered by the presence of acetate and its effect on sintering.
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DOI：
10.1088/1468-6996/16/2/025008
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发表时间：
2015-04
影响因子：
5.5
通讯作者：
Guillon O
中科院分区：
文献类型：
--
作者：
Dargatz B;Gonzalez-Julian J;Guillon O
即使在烧结过程中施加外部压力，在致密陶瓷材料中保持纳米结晶度仍然是一个挑战。研究了高纯富醋酸盐氧化锌纳米粉体的压制行为。发现乙酸盐与水的组合在中等温度下压实成绿色体的过程中起关键作用。恒压的施加导致在中等温度（85 °C）下在水的存在下具有上级的堆积密度（理论值的86%）的均匀绿色。相反，如果使用纯ZnO粉末，则不能实现密度的改善。这种压实行为提供了颗粒的上级填充，导致固结压块的高相对密度，而粗化可忽略不计。溶解伴随蠕变扩散的物质运输建议，以强烈支持ZnO颗粒朝向密度超过理论极限的包装理想的单尺寸球的重取向。最后，烧结轨迹表明，与传统工艺相比，晶粒生长被延迟至理论密度的90%。此外，用这种先进的加工方法进行的主体在烧结锻造后几乎没有观察到径向收缩。
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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影响因子：
5.2
作者：
Chinelatto, A. S. A.;Tomasi, R.
通讯作者：
Tomasi, R.
DOI：
10.1111/j.1744-7402.2010.02604.x
发表时间：
2011-11-01
影响因子：
2.1
作者：
Langer, Jochen;Quach, Dat V.;Guillon, Olivier
通讯作者：
Guillon, Olivier
影响因子：
2.8
作者：
Ghule, AV;Lo, B;Ling, YC
通讯作者：
Ling, YC
影响因子：
6
作者：
Anselmi-Tamburini, U;Garay, JE;Munir, ZA
通讯作者：
Munir, ZA
影响因子：
1.8
作者：
Hsieh, Cheng-Hsien
通讯作者：
Hsieh, Cheng-Hsien