2023 Fiscal Year Final Research Report
Evaluation of fracture toughness in electrochemical interfaces composed of porous and dense ceramics
| Project/Area Number |
20K22404
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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| Research Institution | Gifu National College of Technology |
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Principal Investigator |
Kumada Keigo 岐阜工業高等専門学校, その他部局等, 准教授 (40881652)
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| Project Period (FY) |
2020-09-11 – 2024-03-31
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| Keywords | 界面 / 靭性 / 固体酸化物燃料電池 |
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| Outline of Final Research Achievements |
The fracture energy at a porous-dense ceramic interface was evaluated using all-ceramic four-point bending specimens consisting of a thin porous NiO-8YSZ electrode layer sandwiched between two dense 3YSZ electrolyte beams. The Weibull plot of the interfacial fracture toughness data shows that the Weibull modulus was smaller than that of a single material of 3YSZ or NiO-8YSZ, and the variation of the interfacial fracture toughness was large. In addition, when the specimens were reduced and the electrode was changed to Ni-8YSZ, the interfacial fracture toughness tended to decrease.
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| Free Research Field |
材料力学
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| Academic Significance and Societal Importance of the Research Achievements |
SOFCの研究・開発では，構造・熱・流体・電気化学などを連成した高度なシミュレーションにより，セル内部応力の推定が行われている．これに対し，本研究により得られた界面破壊靭性値は界面はく離が発生するか判断するための基礎的なデータとして活用することが期待される．
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