Preparation of porous alumina ceramic with ultra-high porosity and long straight pores by freeze casting
Preparation of porous alumina ceramic with ultra-high porosity and long straight pores by freeze casting
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DOI：
10.1007/s10934-011-9480-y
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发表时间：
2012-06
影响因子：
2.6
通讯作者：
Duanyang Li;Mei-shuan Li
中科院分区：
文献类型：
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作者：
Duanyang Li;Mei-shuan Li
以叔丁醇为溶剂，采用冷冻铸造法制备了多孔氧化铝陶瓷。制备的多孔氧化铝陶瓷具有长而直的多孔结构。非枝状孔隙特征与水、莰烯等常见溶剂制备的非枝状孔隙有很大区别。通过固体载荷可以调节陶瓷的孔隙率。当料浆中固体含量为20 vol%时，氧化铝陶瓷的孔隙率为65%。随着固体负荷量的减小，氧化铝陶瓷的孔隙率呈线性增加。总孔隙率(P)与初始固载(X)的关系为P = 98.8−1.7X。当固载量为10 vol%时，可获得超高孔隙率82%。孔隙率为82%的多孔氧化铝陶瓷密度甚至低于水的密度。孔隙率为63%和82%的多孔氧化铝陶瓷的抗压强度分别为37.0和2.6 MPa。
Porous alumina ceramic was prepared by freeze casting method using tert-butyl alcohol as the solvent. The as–prepared porous alumina ceramic possessed long straight porous structure. The non-dendrite pore feature was quite distinguished from that prepared based on common solvents such as water and camphene. The porosity of the ceramic could be regulated through the solid loading. When the solid loading in the slurry was 20 vol%, the porosity of the alumina ceramic was 65%. With decreasing the solid loading, the porosity of the alumina ceramic increased linearly. The relationship between the total porosity (P) and initial solid loading (X) can be expressed as P = 98.8−1.7X. The ultra-high porosity of 82% could be achieved when the solid loading was 10 vol%. Moreover, the density of the porous alumina ceramic with the porosity of 82% was even lower than water’s. The compressive strength of the porous alumina ceramic with the porosity of 63 and 82% was determined to be 37.0 and 2.6 MPa, respectively.