Abstract
Nanosized ZnAl2O4 powders were synthesized by a high-temperature calcinations method at 1100ºC for 180min. Transparent ZnAl2O4 ceramics were obtained at 1275°C for 15min by spark plasma sintering (SPS) with the home-made nanosized ZnAl2O4 powders. To improve the sinterability, 0.5wt% tetraethyl orthosilicate (TEOS) was used as a sintering agent, so that a higher transmittance was obtained at a lower sintering temperature of 1260°C. The transparent ZnAl2O4 ceramics sintered by the improved sintering process had a more uniform microstructure with an average grain size of 500nm and a high relative density. The in-line transmittance of the transparent ZnAl2O4 ceramics reached 63.5% at 550nm and 84.7% at 2000nm.
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