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Optimizing Sintering Conditions for Y2O3 Ceramics: A Study of Atmosphere-Dependent Microstructural Evolution and Optical Performance
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Optimizing Sintering Conditions for Y2O3 Ceramics: A Study of Atmosphere-Dependent Microstructural Evolution and Optical Performance
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Optimizing Sintering Conditions for Y2O3 Ceramics: A Study of Atmosphere-Dependent Microstructural Evolution and Optical Performance
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Journal Article
Optimizing Sintering Conditions for Y2O3 Ceramics: A Study of Atmosphere-Dependent Microstructural Evolution and Optical Performance
2025
Overview
This paper systematically investigated the influence of sintering atmospheres, vacuum, and oxygen, on the microstructure and optical properties of Y2O3 ceramics. Compared with vacuum sintering, sintering in flowing oxygen atmosphere can effectively inhibit the grain growth of Y2O3 ceramics at the final stage of sintering and improve the uniformity of microstructure. After hot isostatic pressing, the samples pre-sintered at oxygen atmosphere showed good in-line transmittance from a visible-to-mid-infrared wavelength range (0.4–6.0 μm) except in the range of 2.8–4.1 μm. Spectral analysis showed that an obvious broadband absorption peak (2.8–4.1 μm) of characteristic hydroxyl groups is detected in the above samples. However, before densification, a low-temperature heat treatment at 600 °C under vacuum can effectively diminish the hydroxyl groups in Y2O3 ceramics. However, laser experiments in the ~1 μm wavelength range showed that although the Yb:Y2O3 ceramic carrying hydroxyl had obvious absorption in the 2.8–4.1 μm range, it had little effect on its laser oscillation in the ~1 μm wavelength. Yb:Y2O3 ceramics pre-sintered in an oxygen atmosphere at 1460 °C followed by hot isostatic pressing at 1440 °C achieved 12.85 W continuous laser output at room temperature, with a laser slope efficiency of 84.4%.
