TY - JOUR
T1 - Metal Ti-Cr alloy powders nitriding under atmospheric pressure by microwave heating
AU - Kashimura, Keiichiro
AU - Fukushima, Jun
AU - Mitani, Tomohiko
AU - Sato, Motoyasu
AU - Shinohara, Naoki
N1 - Funding Information:
One of the authors (K.K) is very grateful to T. Sannomiya, H. Takizawa, M. Tanaka, M. Ignatenko and D. Agrawal for fruitful discussions. This work was supported by the Research Institute for Sustainable Humanosphere, Kyoto University (project: Mission Research, ADAM, METLAB).
PY - 2013/2/15
Y1 - 2013/2/15
N2 - In the presence of microwave radiation, nitridation of metallic titanium in air becomes possible instead of the thermodynamically favorable oxidation. In this study, β-Ti-Cr alloy powders were synthesized to these nitrides by microwaves, using the fact that a solid solution of β-Ti-Cr is similar to pure β-Ti in terms of the electronic structure. The alloy powders were heated to a temperature of 1000 °C or higher by microwaves at a high oxygen partial pressure (PO2=2 × 10-1atm), and were analyzed by both wavelength-dispersive X-ray spectroscopy and X-ray diffraction. Nitridation was achieved for the β-Ti-Cr alloy, but not for a Ti-Fe alloy. The results can be explained using the average energy of electrons in 3d orbitals. Furthermore, multilayer structures made of nitrides and oxides were observed. The powders had a temperature-space distribution in the microwave field and the multi-layer structures corresponded to this distribution.
AB - In the presence of microwave radiation, nitridation of metallic titanium in air becomes possible instead of the thermodynamically favorable oxidation. In this study, β-Ti-Cr alloy powders were synthesized to these nitrides by microwaves, using the fact that a solid solution of β-Ti-Cr is similar to pure β-Ti in terms of the electronic structure. The alloy powders were heated to a temperature of 1000 °C or higher by microwaves at a high oxygen partial pressure (PO2=2 × 10-1atm), and were analyzed by both wavelength-dispersive X-ray spectroscopy and X-ray diffraction. Nitridation was achieved for the β-Ti-Cr alloy, but not for a Ti-Fe alloy. The results can be explained using the average energy of electrons in 3d orbitals. Furthermore, multilayer structures made of nitrides and oxides were observed. The powders had a temperature-space distribution in the microwave field and the multi-layer structures corresponded to this distribution.
KW - 3d Orbital
KW - Metal titanium powder
KW - Microwave heating
KW - Nitridation mechanism
KW - Titanium
KW - Titanium chromium alloy
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U2 - 10.1016/j.jallcom.2012.09.117
DO - 10.1016/j.jallcom.2012.09.117
M3 - Article
AN - SCOPUS:84869130894
SN - 0925-8388
VL - 550
SP - 239
EP - 244
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
ER -