2023 Fiscal Year Final Research Report
Solid-phase joining method for the high corrosion resistance ceramics having self-healing ability and the metal
| Project/Area Number |
19K04080
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | Kushiro National College of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NGUYEN THANHSON 釧路工業高等専門学校, 創造工学科, 准教授 (00797235)
木村 真晃 兵庫県立大学, 工学研究科, 准教授 (90285338)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | Friction welding / Alumina / Self healing / Titanium carbide / Aluminum alloy / Microcracks / corrosion / Galvanic |
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| Outline of Final Research Achievements |
In this study, the Al2O3 round-bar and AC8A(Al-Si12CuNi) round-bar were joined by friction welding. AC8A is a typical piston material treated by the heat treatment T6. The parameters of the joining condition are friction time and upset pressure. SEM observed the microstructure at the interface region of joined materials. 1) Judging from these photographs, the damages to the microstructures at the interface region of joined materials depended on friction time are more significant than those caused by friction time. 2) It is found that the relationship between the joint conditions and mechanical characteristics from three points of bending test results. 3) The interface of Al2O3 suffered the damages(minute cracks) when AC8A and Al203 has been bonded. For countermeasures, Authors give Al2O3 the crack self-healing ability on lower temperature Concretely, titanium carbide(TiC) has been considered as self-healing temperature ranges, such as below 600℃
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| Free Research Field |
材料と加工
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| Academic Significance and Societal Importance of the Research Achievements |
アルミナは高温強度も耐摩耗性も高く，熱変形もしづらいことから，無駄に冷却しなくても良いので高い熱効率が得られ，高温環境下で用いられる機械部品の材料としては貴重であるが，破壊靭性値が著しく低く，且つ極めて高硬度であるため難加工材であり，高額でもある．そのため，製品全体ではなく，必要な部位のみに適用し，それ以外は安価で加工し易い材料で構成するのが妥当である．この異種接合には摩擦圧接を用いる．この接合法は，継手効率が高く，自動車，電機，土木建設など多くの産業分野で用いられており，開発意義は大きい．当然，摩擦攪拌接合への技術展開も可能であるため，産業界全体に与える影響は大きい．
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