Self-healing by design: universal kinetic model of strength recovery in self-healing ceramics
| Autor: | Takahito Ohmura, Shingo Ozaki, Toshio Osada, Toru Hara, Kiichi Kamoda, Masanori Mitome, Taichi Abe |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Kinetics surface cracks 02 engineering and technology ceramics 010402 general chemistry 01 natural sciences Focus on Self-Healing Materials self-healing General Materials Science Ceramic Composite material Materials of engineering and construction. Mechanics of materials 107 Glass and ceramic material 206 Energy conversion / transport / storage / recovery 404 Materials informatics / Genomics 503 TEM STEM SEM Kinetic model 021001 nanoscience & nanotechnology 0104 chemical sciences kinetics Self-healing visual_art visual_art.visual_art_medium TA401-492 0210 nano-technology strength TP248.13-248.65 Research Article Biotechnology |
| Zdroj: | Science and Technology of Advanced Materials, Vol 21, Iss 1, Pp 593-608 (2020) Science and Technology of Advanced Materials article-version (VoR) Version of Record |
| ISSN: | 1878-5514 1468-6996 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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