Abstract
(Tb<sub>0.7</sub>Lu<sub>0.3</sub>)<sub>2</sub>O<sub>3</sub> transparent ceramics were prepared by hydrogen pre-sintering and hot isostatic pressing treatment. ZrO<sub>2</sub> was added as sintering aid to restrain the abnormal grain growth. The microstructure evolution and linear shrinkage changes of the (Tb<sub>0.7</sub>Lu<sub>0.3</sub>)<sub>2</sub>O<sub>3</sub> transparent ceramics in the range of 1400℃~1700℃ were investigated. It can be seen from the results that the linear shrinkage of ceramics increased nonlinearly with the increase of the sintering temperature. In the range of 1550℃~1600℃, the (Tb<sub>0.7</sub>Lu<sub>0.3</sub>)<sub>2</sub>O<sub>3</sub> ceramics had a higher shrinkage rate. And the shrinkage rate slowed down when the temperature exceeded 1600℃. The samples prepared by 1550℃ hydrogen pre-sintering combined with 1550℃ hot isostatic pressing sintering showed good optical property. The average grain size was about 1.69μm and the highest transmittance reached 74.81% @1064 nm.
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