2006 Fiscal Year Final Research Report Summary
Application of Chromium-based Nitride Films to Cutting Tools.
| Project/Area Number |
16360367
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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 |
Material processing/treatments
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| Research Institution | Keio University |
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Principal Investigator |
SUZUKI Tetsuya Keio University, Faculty of Science and Technology, Professor, 理工学部, 教授 (10286635)
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| Co-Investigator(Kenkyū-buntansha) |
NOGUCHI Hirohisa Keio University, Faculty of Science and Technology, Professor, 理工学部, 教授 (70218303)
KOMOTORI Jun Keio University, Faculty of Science and Technology, Professor, 理工学部, 助教授 (30225586)
IKUHARA Yuichi University of Tokyo, Institute of Engineering Innovation, School of Engineering, Professor, 大学院・理工学研究科・総合研究機構, 教授 (70192474)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Nano materials / Mechanics / Surface properties / Material design / Boundary / 環境材料 |
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| Research Abstract |
Metastable PVD films have been developed by incorporating second metals to binary nitride films in aims a gaining excellent mechanical and tribological properties. The cathodic arc method is a specialized method in creating metastable ternary films which cannot be synthesized under stable thermodynamic conditions. In this series of study, 2004-2006, the maximum hardness of ceramics nitride films was investigated based on the phase transition analyzed by X-ray diffraction and scanning and transmission electron microscopy.
Ternary nitride films had higher microhardness than the binaries and had their own maximum hardness at certain values. The crystal structures of Ti_<1-x>Al_xN changed from the NaCl-type to Wurtzite-type at the X=0.6, while the structures of Ti_<1-x>Cr_xN and Ti_<1-x>Zr_xN retained the NaCl-type for all X values. The maximum microhardness of Cr_<1-x>Al_xN and Zr_<1-x>Al_xN were obtained at phase boundary, where films had had some special microstructure with the mixture with crystal and amorphous. Addition of Cr atoms to (Ti, Al) N films expanded maximum Al solubility up to 73 at.% without hexagonal phase segregation. The cubic Ti_xCr_yAl_zN films obtained by thermal annealing were investigated with respect to phase transition, lattice parameter and microhardness. They were kept cubic type even up to 800℃. The lattice parameter of films at decreased by 0.5% compared with to that of room temperature. Finally, cubic phase was partially transformed into hexagonal phase through the thermal diffusion process over 900℃, which decreased its microhardness.
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Research Products
(6 results)
