TY - JOUR
T1 - Fabrication of bulk anatase TiO2 by the spark plasma sintering method
AU - Masahashi, Naoya
N1 - Funding Information:
The author wishes to thank Prof. Hanada for his valuable comments and encouragement for the pursuance of this study. The author gratefully acknowledges the guidance offered by Dr. Ohmori and Mr. Okubo during the SPS experiment. Thanks are also due to the Kanagawa Academy of Science and Technology for providing laboratory facilities. A part of this work was performed at the Laboratory for Advanced Materials, Institute for Materials Research, Tohoku University. The author acknowledges the Grant-in-Aid for Scientific Research (A) (No. 17206070) by the Ministry of Education, Science, Sports, and Culture of Japan.
PY - 2007/4/15
Y1 - 2007/4/15
N2 - Nanocrystalline (7 nm, anatase) and microcrystalline (5 μm, anatase and rutile) TiO2 powders was successfully consolidated by spark plasma sintering (SPS) in the temperature range of 400-550 °C at a pressure of 555 MPa. The consolidated samples of the nanocrystalline powders exhibit an anatase form, when the sintering temperature is low despite the application of high-pressure during SPS. The density of the consolidated samples of the nanocrystalline powders was higher than that of the microcrystalline powders; this is attributed to the difference in the size of TiO2 powders. The consolidated sample of the nanocrystalline powders fabricated at 400 °C shows the lowest contact angle under ultraviolet light illumination. The water contact angle of the consolidated sample of the microcrystalline powders is relatively high as compared to that of the nanocrystalline powders for identical consolidation temperatures. In conclusion, in comparison to the SPS conditions previously reported, we successfully fabricated an anatase-structured bulk TiO2 at lower temperatures by applying a high pressure.
AB - Nanocrystalline (7 nm, anatase) and microcrystalline (5 μm, anatase and rutile) TiO2 powders was successfully consolidated by spark plasma sintering (SPS) in the temperature range of 400-550 °C at a pressure of 555 MPa. The consolidated samples of the nanocrystalline powders exhibit an anatase form, when the sintering temperature is low despite the application of high-pressure during SPS. The density of the consolidated samples of the nanocrystalline powders was higher than that of the microcrystalline powders; this is attributed to the difference in the size of TiO2 powders. The consolidated sample of the nanocrystalline powders fabricated at 400 °C shows the lowest contact angle under ultraviolet light illumination. The water contact angle of the consolidated sample of the microcrystalline powders is relatively high as compared to that of the nanocrystalline powders for identical consolidation temperatures. In conclusion, in comparison to the SPS conditions previously reported, we successfully fabricated an anatase-structured bulk TiO2 at lower temperatures by applying a high pressure.
KW - Consolidation
KW - Hydrophilicity
KW - Spark plasma sintering
KW - Titanium oxide
KW - Transformation
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U2 - 10.1016/j.msea.2006.11.021
DO - 10.1016/j.msea.2006.11.021
M3 - Article
AN - SCOPUS:33847329646
SN - 0921-5093
VL - 452-453
SP - 721
EP - 726
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -