1993 Fiscal Year Final Research Report Summary
Study on formation of functional Cr ceramics film by disproportionation reaction
| Project/Area Number |
04650615
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属精錬・金属化学
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| Research Institution | Nagoya University |
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Principal Investigator |
OKIDO Masazumi Nagoya University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (50126843)
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| Co-Investigator(Kenkyū-buntansha) |
ICHINO Ryouichi Nagoya University, Faculty of Engineering, Assistant Professor, 工学部, 助手 (70223104)
OKI Takeo Nagoya University, Faculty of Engineering, Professor, 工学部, 教授 (30023039)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Chromium nitride / Surface modification / Molten salts chemistry / Ceramics film / Surface hardening / Disproportionation reaction |
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| Research Abstract |
Chromium nitride ceramics film was formed on the nitrided steels by immersing in chloride molten salts with chromium fluoride and ferro-chromium. Film formation reaction is based on the disproportionation reaction of chromium ions inmolten salts. The film consisited of chromium nitride, CrN and Cr_2N, and Fe-Cr solid solution, of which thickness depended on the treatment temperature, time and bath composition. The film showed high hardness from 1300 Hv to 3000 Hv. It has a good corrosion resistance in aqueous chloride solution in ambient temperature due to the surface diffusion anti-corrosive layr of chromium. Moreober, complex Cr-Si film, CrSi_2, could be formed on the steel by two step techniques. Therefore, It can be possible to make ceramics films on the specimen, which has no element for films, by using a multistep treatment in the molten salt.
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