| Project/Area Number |
15360449
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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 |
Aerospace engineering
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| Research Institution | Osaka University |
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Principal Investigator |
KOBAYASHI Akira Osaka University, JWRI, Assoc.Prof., 接合科学研究所, 助教授 (70110773)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMURA Toshiro Nagoya University, School of Eng., Prof., 大学院・工学研究科, 教授 (90126904)
KATAYAMA Seiji Osaka University, JWRI, Assoc.Prof., 接合科学研究所, 教授 (10144528)
HIRATA Yoshinori Osaka University, School of Eng., Prof., 大学院・工学研究科, 教授 (00116089)
KOMURASAKI Kimiya University of Tokyo, Graduate School of Frontier Sciences, Assoc.Prof., 大学院・新領域創成科学研究科, 助教授 (90242825)
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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 |
¥14,900,000 (Direct Cost: ¥14,900,000)
Fiscal Year 2005: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2004: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2003: ¥6,400,000 (Direct Cost: ¥6,400,000)
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| Keywords | TiN coating / Gas tunnel type plasma jet / Plasma reactive spraying / High hardness / Graded functionality / Thermal barrier coating / ZrO_2-Al_2O_3 composite coating / Porosity / プラズマ反応容射 / ガストンネル型プラズマジェット |
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| Research Abstract |
The results obtained by this study are as follows :
1) The titanium nitride (TiN) coatings of 150μm thickness were obtained at P=25kW, t=5s in a short time operation, by means of the gas tunnel type plasma reactive spraying. Some coating characteristics which depend on the traverse number, powder feed rate, the environmental gas, etc. were clarified and the optimum condition was decided.
2) The hardness of TiN coating was uniform in the cross section and the porosity was decreased with increase in the traverse number. The adhesion strength of TiN coating was about 14 MPa, and was decreased as the thickness was increased. As the results, 100μm thickness coating had better mechanical properties such as wear resistance.
3) The TiN ratio of the obtained TiN coating was more than 95%, and was increased with increased in the mixing ratio of N_2 gas. After heat treatment the property of the TiN coating was improved without oxidation.
4) High hardness zirconia (ZrO_2-Al_2O_3) composite coating formed by gas tunnel type plasma spraying had a graded functionality of hardness. With increase in Al_2O_3 mixing ratio, the graded functionality ZrO_2-Al_2O_3 composite coating was enhanced and dense coating was obtained. The combination of high hardness of Al_2O_3 with the low thermal conductivity of ZrO_2 will contribute the development of high functionally graded TBC (thermal barrier coating).
5) The plasma temperature was 8000K at the torch exit, and the sprayed particle velocity was 150m/s, which were increased with increase in the plasma input power.
6) This study proved that these coatings was available as High-Heat Resistant Materials for Aerospace Use, by using of gas tunnel type plasma spraying and/or reactive spraying method.
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