Preparation of a Dense/Porous BiLayered Ceramic by Applying an Electric Field During Freeze Casting
Preparation of a Dense/Porous BiLayered Ceramic by Applying an Electric Field During Freeze Casting
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DOI：
10.1111/j.1551-2916.2009.03110.x
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发表时间：
2009-08
影响因子：
3.9
通讯作者：
Yumin Zhang;Luyang Hu;Jiecai Han
中科院分区：
文献类型：
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作者：
Yumin Zhang;Luyang Hu;Jiecai Han
通过在冷冻铸造过程中引入电场，制备了致密/多孔双层陶瓷。通过在制冷设备上放置含水陶瓷，以6°C/分钟的恒定冷却速度进行定向凝固。当浆料的底部温度降至0°C时，沿垂直方向施加电场，直到冻结过程完成。生坯经过干燥和烧结后，得到了致密/多孔双层结构的陶瓷。结果表明，当电场强度从15 V增加到90 V时，通过调节电场强度，可以控制样品中致密层的厚度。另一方面，所有样品在多孔区表现出几乎相同的片层厚度和层间距，分别为~14μm和~24μm。
Dense/porous bilayered ceramics were fabricated by introducing an electric field into the freeze-casting process. A unidirectional solidification was performed by placing an aqueous ceramic on refrigerating equipment, at a constant cooling rate of 6°C/min. When the bottom temperature of the slurry was reduced to 0°C, an electric field along the vertical direction was applied until the freezing process was completed. After drying and sintering of the green part, an as-prepared ceramic with dense/porous bilayered architectures was obtained. It was shown that the thickness of the dense layer in the sample could be controlled by tuning the electric field intensity from 51 to 155 μm as the electric field increased from 15 to 90 V. On the other hand, all samples exhibited almost an identical lamellae thickness and interlayer distance in the porous region, as large as ~14 and ~24 μm, respectively.