2017 Fiscal Year Final Research Report
Development of plasma nitriding in specimen with narrow gap
| Project/Area Number |
15K14187
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Material processing/Microstructural control engineering
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| Research Institution | Daido University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | プラズマ窒化処理 / 微小隙間 / 化合物層 |
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| Outline of Final Research Achievements |
A new plasma nitriding technology using dc and RF glow discharge were performed in order to increase the surface hardness in the slit of tool steels. The following conclusions were drawn.
1. In dc and RF glow discharge plasma, Diffusion-based nitriding can be attained by controlling the sample potential, that ultimately maintain neutral particles. 2. RF plasma nitriding of the tool steel were obtained a surface hardness of more than two times that of the untreated sample in high vacuum atmosphere (0.6 Pa). 3. The nitriding speed of new dc glow discharge plasma process is 20% faster than that of conventional glow discharge plasma. 4. The inner sample surface with a gap of 1mm can be hardened by new plasma nitriding. The results obtained were as-finished mirror finish with deep diffusion layer and a hardness of more than two times that of the untreated sample with narrow gap.
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| Free Research Field |
表面改質
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