2014 Fiscal Year Final Research Report
Development of a New Surface Modification Technique for Improving High-temperature Corrosion Resistance of Refractory Metals
| Project/Area Number |
24560887
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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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| Research Field |
Material processing/treatments
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| Research Institution | Kumamoto University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Keywords | 高融点金属 / 鉄粉 / グラファイト / 窒素ガス / 表面改質 / 炭化物 / 窒化物 / 炭窒化物 |
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| Outline of Final Research Achievements |
Group 4 to 6 metals are known as a refractory metal. To directly coat their surfaces with their carbide and nitride layers, it is necessary to remove a thermodynamically stable oxide film on the surface before carbon and nitrogen are diffused into the metal. Therefore, surface modification for their metals is difficult. On the other hand, we have found a simplified technique for forming a titanium carbonitride layer on the surface of titanium, which belongs to group 4 in the periodic table. Specifically, a titanium plate is embedded in a mixture containing iron and graphite powders, and then heat-treated at a temperature of around 1273 K in a nitrogen flow. In the present study, this new surface modification technique was applied to the refractory metal like molybdenum and tantalum, and its effectiveness was investigated from a viewpoint of a practical technique.
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| Free Research Field |
材料組織制御学
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