2022 Fiscal Year Final Research Report
Production of Gradient Structured Ceramic Coating on Al Alloy Surface by Discharge Process in Liquid at Low Temperature
| Project/Area Number |
20K04216
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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 18020:Manufacturing and production engineering-related
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| Research Institution | Daido University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 窒化アルミニウム皮膜 / 放電 / 表面処理 / アルミニウム |
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| Outline of Final Research Achievements |
In this study, the surface nitriding process by an electrical discharge in liquid nitrogen was applied to aluminums, and the effect of plasma in low-temperature liquid on the formation of aluminum nitride layer was investigated. The microstructure of the aluminum nitride film was also investigated, and the possibility of gradient structuring of the layer was examined. The substrate temperature during discharge in liquid nitrogen was measured, and the effect of polarity on the formation of aluminum nitride was clarified. The aluminum nitride microstructure was also clarified. Although we succeeded in identifying the nitrogen-excited species in this method, we could not find a clear relationship between the liquid temperature and the film structure.
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| Free Research Field |
材料加工
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| Academic Significance and Societal Importance of the Research Achievements |
液体窒素中で放電を発生させ，アルミニウム表面に窒化アルミニウム皮膜を生成させた例は他になく，従来の成膜法であるイオン窒化よりも極めて短時間で生成できること，電極材質により皮膜の微細構造が異なることなどの新たな知見が得られた。このことは本研究の有用性を示している。これらの結果からアルミニウムのさらなる利用拡大が期待できるため本研究の社会的意義は大きいと思われる。また，液体窒素中放電での窒素活性種を特定したことは学術的意義が大きいと思われる．
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