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- Title
Y<sub>2</sub>O<sub>3</sub>-MgO-ZrO<sub>2</sub> Infrared Transparent Ceramic Nanocomposites.
- Authors
Wang, Jiwen; Zhang, Lichun; Chen, Dianying; Jordan, Eric H.; Gell, Maurice; Chen, I.-W.
- Abstract
Increased strength and improved erosion resistance are required for future infrared windows working in harsher mechanical and thermal environments than those used today. In this study, Y2O3-MgO-ZrO2 composite nanopowders were synthesized using a sol-gel combustion process. The fully dense Y2O3-MgO-ZrO2 nanocomposites were prepared by pressureless sintering of the nanopowders at 1400°C for 2 h, followed by hot isostatic pressing at 1350°C for 1 h. The effects of ZrO2 concentration on the microstructure, infrared transmittance, and microhardness of the nanocomposites were studied. It is shown by X-ray diffraction ( XRD) and transmission electron microscopy ( TEM) that ZrO2 is selectively soluble in Y2O3 with the concentration up to 13.2 mol%, forming supersaturated solid solution. The microhardness of the Y2O3-MgO-ZrO2 nanocomposites scales linearly with the square root of the ZrO2 concentration (from 10.6 GPa without ZrO2 to 13.5 GPa with 13.2 mol% ZrO2 addition). Good mid-infrared transmittance (53%-70%) over 3-7 μm wavelength was maintained with ZrO2 concentration up to 8.8 mol%, compared with that of Y2O3-MgO nanocomposites (62%-80%) at the same wavelength range. This work shows ZrO2 solid solution strengthened Y2O3 ( ZSSY) nanocomposites for their potential to be used as infrared transparent materials with enhanced mechanical properties.
- Subjects
SPECTRUM analysis; TRANSPARENT ceramics; SYNTHESIS of Nanocomposite materials; SOL-gel processes; CHEMISTRY methodology; CHEMICAL synthesis; TRANSMITTANCE (Physics)
- Publication
Journal of the American Ceramic Society, 2012, Vol 95, Issue 3, p1033
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2011.04928.x