Control of pore structures and sizes in freeze cast ceramics
Control of pore structures and sizes in freeze cast ceramics
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DOI：
10.1179/1743676113y.0000000100
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发表时间：
2013-10
影响因子：
2.2
通讯作者：
Yan Zhang;Kechao Zhou;Jing Zeng;Dou Zhang
中科院分区：
文献类型：
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作者：
Yan Zhang;Kechao Zhou;Jing Zeng;Dou Zhang
研究了陶瓷水悬浮液的冷冻铸造法制备具有连通、排列的层状孔的多孔陶瓷。研究了通过调节工艺参数对孔结构和尺寸的调控。通过控制固相含量和颗粒大小，制备了不同粘度的Al 2 O3悬浮液。采用微米级Al 2 O3粉末制备的陶瓷片层孔宽大，陶瓷片层壁薄，无缺陷。通过改变冷却速率，可以在12 ~ 49 μm、4-26 μm和37.4 ~ 56.2%的范围内调节片层孔宽、陶瓷壁厚和孔隙率。有机添加剂的引入不仅可以改变孔径，而且可以改变孔形态。双模板导致层状孔和大孔共存。该方法能够产生有向长程有序结构，操作灵活，可满足不同的应用需求。
Freeze casting of aqueous ceramic suspension was investigated as a method for preparing porous ceramic with interconnected, aligned lamellar pores. The manipulation of the pore structures and sizes by adjusting the processing parameters was studied. Al2O3 suspensions with different viscosities were prepared by controlling the solid loadings and particle sizes. Larger lamellar pore width and thinner lamellar ceramic wall without any defect were achieved by the utilisation of microsized Al2O3 powder. Lamellar pore width, ceramic wall thickness and porosity can be tailored ranging from 12 to 49 μm, 4–26 μm and 37·4–56·2% respectively by changing the cooling rates. The incorporation of organic additives can modify not only the pore size but also the pore morphology. Double templates resulted in the coexistence of lamellar pores and large pores. The ability to produce an oriented long range ordered architecture and its manipulation flexibility indicated the potential of this method for different needs in application.