Abstract
A Dy-α-sialon with a composition of Dy 0.33Si 9.3Al 2.7O 1.7N 14.3 was prepared by hot pressing at 1800 °C with an intermediate dwelling at 1550 °C or 1650 °C during the sintering. The microstructures and optical properties of the sintered specimens were studied. The results showed that an intermediate dwelling stage in the hot pressing was beneficial to densification of the specimens and could suppress the development of elongated α-sialon grains, but it had a negative effect on hardness and fracture toughness. Besides, the intermediate dwelling process also improved the optical transmittance and the maximum infrared transmission, which is attributed to the increase in bulk density and the development of a homogeneous equi-axed microstructure.
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