Abstract
In this investigation, yttria nanopowder was synthesized by precipitation method using yttria micro powder and ammonium hydrogen carbonate as precursor materials. The most important parameters, aging time and calcination temperature, have been reviewed in detail. The effects of aging time (3, 6, 12 and 24 h) and calcination temperature (700o, 800o, 900o, 1000o and 1100oC) were studied. Disk samples were fabricated from nanopowder at 1800oC and 50 Mpa via SPS method. Synthesized phases, thermal behaviour and particle size were shown by X-ray diffraction pattern, thermogravimetry and differential thermal analysis, and field emission scanning electron microscopy, respectively. Fourier transform infrared spectroscopy was used for bonding study before and after heat treatment at different temperatures.
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