Affiliation:
1. School of Materials Science and Engineering, Hanoi University of Science and Technology, Hanoi, Vietnam
2. Thai Nguyen University of Technology, Thai Nguyen, Vietnam
Abstract
Sol-gel-synthesized ZrO2-based nanoparticles, containing 1.5mol% Y2O3 used as
dopant and 25mol% Al2O3 (abbreviated as ZrO2(1.5Y)-25Al2O3), were densified
by pulsed electric current sintering (PECS) accompanied with a two-step
heating profile. Particularly, sintering was carried out in the temperature
range from 1050 to 1200?C for 10min, followed by dwell at 1325?C for
10min. The ZrO2-based ceramics achieved by the two-step sintering was fully
dense, containing 98 vol.% of tetragonal ZrO2 phase. Morphology of the
sintered samples showed the submicron grains with uniform size distribution.
Although the second-step sintering temperature was fixed at 1325?C, the
mean grain size was increased along with the increase in the first-step
sintering temperature. In addition, the material characterization of the
samples after the first-step heating was tested to investigate the influence
of the first-step sintering on the consolidation of ceramics achieved via
the two-step sintering.
Publisher
National Library of Serbia