Effect of porosity on the crack pattern and residual strength of ceramics after quenching
Effect of porosity on the crack pattern and residual strength of ceramics after quenching
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DOI：
10.1007/s10853-013-7444-0
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发表时间：
2013-05
影响因子：
4.5
通讯作者：
Y. Shao;Ruiqi Du;Xiaofeng Wu;F. Song;Xianghong Xu;Chiping Jiang
中科院分区：
文献类型：
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作者：
Y. Shao;Ruiqi Du;Xiaofeng Wu;F. Song;Xianghong Xu;Chiping Jiang
通过对陶瓷片裂纹的测量，研究了气孔率对陶瓷水淬后裂纹特征的影响。结果表明，在孔隙率为0 ~ 20%的范围内，由于多孔氧化铝陶瓷中长裂纹的长度和密度均略小于致密氧化铝陶瓷，因此孔体积分数对陶瓷抗热震性能的提高影响不大。这一结果与根据最小势能原理用实验测量数据所作的预测是一致的。此外，在第三政权的强度降低的比例显着降低，随着孔隙率的增加，因为未淬火试样的强度下降更快比淬火试样的孔隙率增加。本研究结果有助于进一步了解陶瓷材料的热震行为。
The effect of porosity on the crack characteristics of ceramics after water-quenching is studied by measuring the cracks in ceramic sheets. The result reveals that the pore volume fraction has a slight effect on the enhancement of thermal shock resistance of ceramics when the porosity ranges from 0 to 20 %, because the length and density of the long crack in porous alumina are always slightly less than that in dense alumina. This result is in agreement with the prediction based on the minimum potential energy principle using experimentally measured data. Moreover, the proportion of the strength reduction in the third regime decreases significantly with increasing porosity, because the strength of unquenched specimens decreases more rapidly than that of quenched specimens with increasing porosity. The results of this study may help to further understand the thermal shock behavior of ceramics.