(Tb0.7Lu0.3)2O3 transparent ceramics were prepared by hydrogen pre-sintering and hot isostatic pressing treatment. ZrO2 was added as sintering aid to restrain the abnormal grain growth. The microstructure evolution and linear shrinkage changes of the (Tb0.7Lu0.3)2O3 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 (Tb0.7Lu0.3)2O3 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.
The microstructure evolution and optical properties of vacuum combined with hot isostatic pressing(HIP) sintered Tm,Ho:(Lu2/3Sc1/3)2O3 transparent ceramics were studied. The ceramics were sintered in vacuum followed by HIP to obtain Tm,Ho:(Lu2/3Sc1/3)2O3 with high transparency. Changes of microstructure and densification rate due to the vacuum sintering temperature increasing were studied from 1100°C to 1780°C. With the increase of the operating temperature, the densification rate of the ceramics presented nonlinear characteristics. The growth of the grains was remarkably accelerated at higher temperatures (above 1500°C). The in-line transmittance of Tm,Ho:(Lu2/3Sc1/3)2O3 ceramics vacuum sintered at 1780°C followed by HIP at 1700°C exceeded 81.68% at 2090 nm.
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