2004 Fiscal Year Final Research Report Summary
Establishment of Three-Dimensional Reactive-Freeform Processing for Auminide Intermetallics
| Project/Area Number |
14205108
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Osaka University |
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Principal Investigator |
MIYAMOTO Yoshinari Osaka University, Joining and Welding Research Institute, Professor, 接合科学研究所, 教授 (60107084)
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| Co-Investigator(Kenkyū-buntansha) |
IKEUCHI Kenji Osaka University, Joining and Welding Institute, Professor, 接合科学研究所, 教授 (10030058)
MITSUURA Kiyotaka Hokkaido University, Department of Materials Engineering, Associate Professor, 大学院・工学研究科, 助教授 (60142692)
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| Project Period (FY) |
2002 – 2004
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| Keywords | Aluminides / Intermetallics / Freeform fabrication / Combustion synthesis / Reactive coating / Rapid prototyping / NiAl / Ti |
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| Research Abstract |
The objective of this research is to develop new three-dimensional micro-welding methods being enable to freeform aluminide intermetallics, refractory metals and alloys which are superior in heat, corrosion and wear resistances, but difficult in manufacturing and machining. We aim to establish the remote fabrication process by combining 3DMW and IT technology in future. The obtained results are summarized as follows.
1.3D micro-welding which can freeform dense aluminide intermetallics and other refractory metal objects has been first developed in the world.
2.It is a CAD/CAM system to form molten micro metal beads by discharging arc to the tip of a thin metal wire with around 200μm in diameter and build up three dimensionally. We have succeeded in formation of Ti, Ni, Ta, TiNi, inconel beads, and their simple 3D objects. The morphology, composition, and microstructure of beads were also investigated.
3.It was demonstrated to synthesize and simultaneously freeform intermetallics such as NiAl and TiNi by providing two different wires alternately in 3DMW system.
4.We added a function of metal nitride layer formation to 3DMW by producing a micro molten pool at the surface of a metal substrate and blowing nitrogen gas. Furthermore, by moving a discharging electrode and providing a thin aluminum wire to the small molten pool, the aluminide coating was prepared on the metal surface. By these methods, TiN coating on Ti and TiAl, and NbN on Nb were performed. The NbAl_3 layer was formed on Nb as well. These coatings showed remarkable improvements in hardness, wear and oxidation resistances.
We could establish the basic technology of freeforming and coating of heat, wear, corrosion resistant objects by this research.
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