Self-healing by design: universal kinetic model of strength recovery in self-healing ceramics
Self-healing by design: universal kinetic model of strength recovery in self-healing ceramics
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DOI：
10.1080/14686996.2020.1796468
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发表时间：
2020-01
影响因子：
5.5
通讯作者：
T. Osada;T. Hara;M. Mitome;S. Ozaki;T. Abe;K. Kamoda;T. Ohmura
中科院分区：
文献类型：
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作者：
T. Osada;T. Hara;M. Mitome;S. Ozaki;T. Abe;K. Kamoda;T. Ohmura
本文提出了一个新的含修复剂（HA）复合材料表面裂纹氧化自修复强度恢复的理论动力学模型。动力学是结构部件设计中的一个关键参数，可以自我修复在使用中造成的损伤。基于裂缝间隙填充的三维（3D）观察，两个裂缝间隙填充模型，即，一个桥接模型和一个嘴到嘴填充模型，被纳入所提出的动力学模型。这些裂纹间隙填充模型占的微观结构特征的断裂表面，裂纹的几何形状，和氧化动力学的愈合剂。因此，在愈合的裂纹间隙中的最小和最大剩余缺陷尺寸估计为各种愈合温度，时间和氧分压条件。此外，非线性弹性断裂力学适合于小尺寸的剩余缺陷，连同原始威布尔型强度分布的统计分析，使愈合的复合材料的强度上限和下限的预测。三个烧结氧化铝基复合材料含有碳化硅（SiC）型具有各种体积分数和形状的HA，连同单片SiC陶瓷，被认为是。模型预测的复合材料的愈合强度与实验值吻合较好。这种理论方法可以应用于HA而不是SiC，并使自修复陶瓷组件的设计用于各种应用。图形摘要
ABSTRACT We propose a new theoretical kinetic model of strength recovery by oxidation-induced self-healing of surface cracks in composites containing a healing agent (HA). The kinetics is a key parameter in the design of structural components that can self-heal the damage done in service. Based on three-dimensional (3D) observations of crack-gap filling, two crack-gap filling models, i.e., a bridging model and a tip-to-mouth filling model, are incorporated in the proposed kinetic model. These crack-gap filling models account for the microstructural features of the fracture surfaces, crack geometry, and oxidation kinetics of the healing-agent. Hence, the minimum and maximum remaining flaw sizes in the healed crack gaps are estimated for various healing temperatures, times, and oxygen partial pressure conditions. Further, the nonlinear elastic fracture mechanics suitable for small-sized remaining flaws, together with a statistical analysis of the original Weibull-type strength distribution, enables the prediction of upper and lower strength limits of the healed composites. Three sintered alumina matrix composites containing silicon carbide (SiC)-type HAs with various volume fractions and shapes, together with monolithic SiC ceramics, are considered. The strength of the healed-composite predicted by our model agrees well with the experimental values. This theoretical approach can be applied to HAs other than SiC and enables the design of self-healing ceramic components for various applications. Graphical Abstract