Abstract
Commercial Y2O3 nanopowder was used to fabricate transparent Y2O3 ceramics by spark plasma sintering under the pressure of 100MPa for 20min with the heating rate of 100°C/min. The microstructures, mechanical and optical properties of the Y2O3 ceramics sintered at different temperatures were investigated in detail. Densification occurred up to a sintering temperature of 1500°C, and above 1500°C, rapid grain growth and pore growth occurred. The highest relative density of 99.58% and the minimum average grain size of 0.58±0.11µm were obtained at 1500°C. The flexural strength, hardness and fracture toughness of the optimal spark plasma sintered Y2O3 ceramic were 122MPa, 7.60GPa and 2.06MPa.m1/2, respectively. The Y2O3 ceramic sintered at 1500°C had the in-line transmission of about 11–54% and 80% in the wavelength range of 400–800nm and 3–5µm, respectively.
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