TY - JOUR
T1 - Wear resistance of SiO2-doped Y-TZP grinding media during wet milling
AU - Ohnishi, Hiroshi
AU - Takeuchi, Miyuki
AU - Sekino, Tohru
AU - Ikuhara, Yuichi
AU - Niihara, Koichi
PY - 2010/7/1
Y1 - 2010/7/1
N2 - Grinding media 1 mm in diameter, containing 0.4 and 0.7 wt% SiO 2, were fabricated using Y-TZP powder prepared by the liquid-phase method. The wear resistance of media for grinding, with and without the addition of BaTiO3 powder, was evaluated at 20-80°C in water and in a nonaqueous solvent, isoparaffin. A rapid increase in the media wear rate of SiO2-undoped media at 60°C was observed using water as a solvent, but little wear was observed for isoparaffin. The operating time until a rapid increase in the wear rate was observed in water increased with the increase in the grain size of the Y-TZP media. When the media wear became stable, the media surface was observed to be smooth. This suggested that the hydration reaction of Y2O3 and/or ZrO2 by OH- was inhibited by an increase in the grain size, and as a consequence, the decay of the grain boundaries was suppressed. In contrast, several traces of grain loss from the grain boundaries were confirmed on the worn surface of the media when a rapid increase in the wear rate was observed. The wear resistance for grinding BaTiO3 powder using SiO2-doped and -undoped media was also investigated. The wear for SiO2-undoped media increased drastically with increasing slurry temperature; however, the wear for SiO2-doped media did not increase, but was low and stable, regardless of the slurry temperature. This indicated that the hydration reaction of Y2O 3 and/or ZrO2 by OH- was further inhibited by the segregation of SiO2 at the grain boundaries, and hence SiO 2-doped Y-TZP media have high wear resistance, even with increased slurry temperature.
AB - Grinding media 1 mm in diameter, containing 0.4 and 0.7 wt% SiO 2, were fabricated using Y-TZP powder prepared by the liquid-phase method. The wear resistance of media for grinding, with and without the addition of BaTiO3 powder, was evaluated at 20-80°C in water and in a nonaqueous solvent, isoparaffin. A rapid increase in the media wear rate of SiO2-undoped media at 60°C was observed using water as a solvent, but little wear was observed for isoparaffin. The operating time until a rapid increase in the wear rate was observed in water increased with the increase in the grain size of the Y-TZP media. When the media wear became stable, the media surface was observed to be smooth. This suggested that the hydration reaction of Y2O3 and/or ZrO2 by OH- was inhibited by an increase in the grain size, and as a consequence, the decay of the grain boundaries was suppressed. In contrast, several traces of grain loss from the grain boundaries were confirmed on the worn surface of the media when a rapid increase in the wear rate was observed. The wear resistance for grinding BaTiO3 powder using SiO2-doped and -undoped media was also investigated. The wear for SiO2-undoped media increased drastically with increasing slurry temperature; however, the wear for SiO2-doped media did not increase, but was low and stable, regardless of the slurry temperature. This indicated that the hydration reaction of Y2O 3 and/or ZrO2 by OH- was further inhibited by the segregation of SiO2 at the grain boundaries, and hence SiO 2-doped Y-TZP media have high wear resistance, even with increased slurry temperature.
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U2 - 10.1111/j.1744-7402.2009.02360.x
DO - 10.1111/j.1744-7402.2009.02360.x
M3 - Article
AN - SCOPUS:77954336586
VL - 7
SP - 502
EP - 511
JO - International Journal of Applied Ceramic Technology
JF - International Journal of Applied Ceramic Technology
SN - 1546-542X
IS - 4
ER -