Journal
CERAMICS INTERNATIONAL
Volume 49, Issue 11, Pages 18187-18194Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2023.02.187
Keywords
SPS; Two-step sintering; Sol-gel synthesis
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Transparent Y2O3-MgO nanocomposite ceramic was synthesized by sol-gel route and processed through sintering and post-treatments to achieve excellent performance.
Transparent Y2O3-MgO nanocomposite ceramic has been processed for mid-IR window applications. The powder was synthesized by a sol-gel route. The final temperature of this process has an impact on the crystallite size and crystallization ratio. A homogeneous powder with around 10 nm crystallite size was made with a final tem-perature of 600 degrees C. The powder was then sintered by the SPS technique performing a two-step sintering process at 1200 degrees C/50 MPa instead of a conventional bearing. A fully dense ceramic (>99%) with an average grain diameter of 150 nm (compared to 350 nm with one-stage sintering) was obtained. After HIP at 400 MPa and annealing in air for 100 h post-treatments, the IR transmittance in the 3-5 mu m wavelength range exceeds 80% for a thickness of 1 mm. Transparency loss at 5 mu m is less than 10% at 1000 degrees C, which is more suitable for the IR's band II than materials such as sapphire, spinel or AlON.
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