Fracture behavior of cylindrical porous alumina with pore gradient
Fracture behavior of cylindrical porous alumina with pore gradient
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DOI：
10.1016/j.jeurceramsoc.2004.03.016
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发表时间：
2005-04
影响因子：
5.7
通讯作者：
Chun-Hong Chen;K. Takita;Sawao Honda;H. Awaji
中科院分区：
文献类型：
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作者：
Chun-Hong Chen;K. Takita;Sawao Honda;H. Awaji
在这项研究中，通过将较低的烧结温度与有机前体（PMMA颗粒）的存在相结合，制备了具有沿径向孔隙梯度的层状圆柱形多孔氧化铝材料。实验证明，在离心成型工艺中，层压法可以控制孔隙形态。采用环压缩试验研究了具有孔隙梯度的多孔层合氧化铝的断裂行为。基于弯曲梁理论，提出了考虑孔隙梯度的断裂强度计算公式。断裂行为有两种类型，它们与层合过程无关，并随成孔剂的用量而变化。在孔隙率相同的情况下，断裂强度随层压层数的增加而降低，连续分级柱的强度最小。
In this study, laminated cylindrical porous alumina materials with a pore gradient along the radial direction are fabricated by combining a lower sintering temperature with the presence of an organic-former (PMMA particles). It has been proved that pore morphology can be controlled by the lamination method in the centrifugal molding technique. The fracture behavior of the porous laminated alumina with a pore gradient is investigated by using the ring compression testing. An analytical formula to account for the pore gradient is introduced to calculate fracture strength based on the curved beam theory. There are two types of fracture behavior, which are not related to the lamination process and vary with the amount of pore-former. In the case of the same porosity, a reduction in fracture strength is observed with increase in the number of laminated layers, and the minimum strength is found in continuous graded cylinders.