| Project/Area Number |
02453065
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学・無機材料工学
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| Research Institution | Hokkaido University |
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Principal Investigator |
INAGAKI Michio Fac.Eng., Hokkaido Univ. Prof., 工学部, 教授 (20023054)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Osamu Kanagawa Inst. of Tech. Assist., 助手 (00230540)
SHIMIZU Akira Fac.Eng., Hokkaido Univ. Assist., 工学部, 助手 (90002013)
SHIMADA Shiro Fac.Eng., Hokkaido Univ. As-Prof., 工学部, 助教授 (90002310)
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| Project Period (FY) |
1990 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1992: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1991: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1990: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | Oxide Coating / Antioxidation / Carbon Materials / Zircon / Sol-Gel / Carbide / シリコン / ジルコニウム / カ-バイド |
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| Research Abstract |
In order to find out the conditions for antioxidation coating of some oxide films on carbon materials, the fundamental studies on the following two points were carried out; 1) oxide coating by using sol-gel method and 2) oxidation mechanism of metal carbides.
By selecting the suitable metal alkoxides and employing a simple dipping process, the films of ZrO_2, SiO_2 and also ZrSiO_4 were coated on the carbon materials. The viscosity of the alkoxide solutions was found to govern the thickness of oxide films. In order to get homogeneous film of ZrSiO_4, it was found to be essential to control the hydrolysis rates of each alkoxide.
From the kinetic studies of oxidation of TiC and ZrC the diffusion of oxygen was found to be a rate-determining process. For both carbides, a formation of intermadiate layer between carbide and oxide was observed. For TiC, this intermediate layers are supposed to consist of titanium oxycarbide and suboxides. For ZrC, the segregation of carbon was expected, possibly diamond structure. The experimental results suggest the importance of these intermediate layers for having good adhesion between carbide and oxide.
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