Effect of Micro Ti and TiO2 P-25 Nano Powder Addition on Mechanical Properties of TiO2 Nanopowders
Hyo Young Park, Rumman Md Raihanuzzaman, Han-Jin Ko, Joon-Min Park, Young-Choon Kim and Soon-Jik Hong
Affiliation: Division of Advanced Materials Engineering, Kongju National University, 275, Budae-dong Cheonan, Chungnam, 331-717, South Korea.
Keywords: Densification, magnetic pulsed compaction, mechanical properties, rutile, sintering, TiO2 nanopowder.
Sintered bodies of TiO2nanopowders were fabricated by magnetic pulsed compaction (MPC) and subsequent 2 step sintering
in this study and then, the effect of micro Ti and P-25 nano TiO2 powder addition on density, shrinkage and hardness was investigated.
The optimum processing conditions in order to find the maximum density, hardness and shrinkage were found to be 0.5~0.7 GPa MPC
pressure and 1450oC sintering temperature, with addition of 6% of TiO2 P-25 nanopowder. High pressure and rapid compaction using
magnetic pulsed compaction (MPC) enhanced the density with increasing MPC pressure up to 0.7 GPa without the formation of surface
or edge cracks on the consolidates bulks, and significantly reduced the shrinkage rate (about 15 in this case) of the sintered bulks compared
to the general process (about 18%). Overall, most of the properties showed gradual changes with increasing MPC-ed pressure and
TiO2 P-25 nanopowder content.
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