Control of the nanostructure of MgO-Y2O3 composite ceramics using two-step sintering for high temperature mid infrared window applications

被引:10
作者
Brard, Nathan [1 ]
Petit, Johan [1 ,4 ]
Emery, Nicolas [2 ]
Horezan, Nicolas [1 ]
Bach, Stephane [2 ,3 ]
机构
[1] Univ Paris Saclay, DMAS, ONERA, F-92322 Chatillon, France
[2] CNRS, ICMPE, UMCR 7182, 2 Rue Henri Dunant, F-94320 Thiais, France
[3] Univ Paris Saclay Evry, Dept Chim, F-91000 Evry, France
[4] Off Natl Etud & Rech Aerosp, French Aerosp Lab, Ctr Chatillon 29,Ave Div Leclerc,BP 72, F-92322 Chatillon, France
关键词
SPS; Two-step sintering; Sol-gel synthesis; TRANSPARENT Y2O3-MGO NANOCOMPOSITES; MECHANICAL-PROPERTIES; GRAIN-SIZE; YTTRIA; MICROSTRUCTURE; NANOPOWDER; SAPPHIRE; PROGRESS;
D O I
10.1016/j.ceramint.2023.02.187
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
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.
引用
收藏
页码:18187 / 18194
页数:8
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