| Project/Area Number |
05650699
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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 |
Material processing/treatments
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| Research Institution | Institute for Materials Processing, Tohoku University |
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Principal Investigator |
INOUE Hirobumi Institute for Materials Processing, Tohoku University, 素材工学研究所, 助教授 (70006039)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1994: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Oxidation / Coating / Pack cementation / Yttrium / Superalloy / 耐熱材料 |
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| Research Abstract |
Formation of the coating layr has been investigated on the superalloys, compared with the titanium-aluminum alloys, coated by yttrium pack in combination with aluminum pack cementation. The dispersion of a small amount of yttrium oxide in the aluminum coating layr has been also investigated. The coating layr and its oxidation have been characterized at high temperatures.
The following results are summarized.
1) A large amount of yttrium in the coating layr on the nickel-base superalloy, even in case of the one that was follwed by aluminum pack cementation, results in the spallation of the oxide scale containing the metal in the cyclic oxidation.
2) The adhesion of the scale to the aluminum coating layr is improved by yttrium pack cementation on the titanium-aluminum alloy.
3) The dispersion of a small amount of yttrium oxide in the aluminum coating layr improves suppression of void formation and adhesion of the scale to the substrate in the cyclic oxidation.
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