| Project/Area Number |
15360401
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Metal making engineering
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| Research Institution | TOYOHASHI UNIVERSITY OF TECHNOLOGY |
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Principal Investigator |
TAKENAKA Toshihide Toyohashi University of Technology, Department of Engineering, Associate Professor, 工学部, 助教授 (60197324)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAKAMI Masahiro Toyohashi University of Technology, Department of Engineering, Professor, 工学部, 教授 (30016597)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥13,700,000 (Direct Cost: ¥13,700,000)
Fiscal Year 2005: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2004: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2003: ¥9,400,000 (Direct Cost: ¥9,400,000)
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| Keywords | Ti / disproportionation / coating / electroless plating / molten salt / steel / corrosion resistance / Mo / チタン合金 / 炭素鋼 / クロム / 析出 / NaCl-KCl / 鋼 / ステンレス鋼 / 温度変化 / フッ化物 |
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| Research Abstract |
Coating and metallizing of refractory metal or its compound by using a disproportionation reaction in molten salt has been studied. Titanium coating in NaCl-KCl equi-molar melt with Ti chloride or fluoride at 1000-1200K was mainly examined in this study. The results are summarized as follows ;
1) The effects of some factors on the disproportionation reaction were clarified theoretically and experimentally. Titanium can be deposited by temperature change owing to the shift in the equilibrium. Titanium alloy coating should also be expected in the case that the substrate can form Ti alloy. Addition of fluoride in the bath may improve the rate of Ti deposition.
2) Titanium metal deposited on alumina substrate by the simple immersion for hours, while Ti compound was seen on quartz glass substrate. These deposits seemed particle-like, and a dense coating layer wasn't obtained. The temperature gradient in the bath seemed effective in the improvement in the deposition rate.
3) Dense and coherent Ti alloy layers up to 100μm were formed on Fe, Ni and carbon steel. The layer consisted of some layers with different composition, and almost the same Ti alloy layer was obtained in the bath with TiCl_8 and K_2TiF_6. The change in the formation rate indicated that the diffusion of the elements in the formed layer controlled the formation rate of the layer. Corrosion resistance of steel against saline was remarkably improved by our Ti alloy coating. A dense and coherent Ti metal layer of a few μm was obtained on stainless steel, and Cr seemed to influenced the peculiar behavior of stainless steel. Deposition in LiCl-KCl eutectic melt at lower temperature was also tried in this study, but enough Ti deposit wasn't obtained.
4) MoO_2 was deposited on metal substrates in the melt with K_2MoO_4, while no deposit was obtained on ceramic.
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