Fabrication of MgO-Y 2 O 3 Composite Nanopowders by Combining Hydrothermal and Seeding Methods

• Published in: Materials Vol. 16; no. 1
• Main Authors: Yang, Shangyu, Lan, Hao, Sun, Xiaoming, Feng, Shaowei, Zhang, Weigang
• Format: Journal Article
• Language: English
• Published: Switzerland 23.12.2022
• Subjects: MgO-Y2O3 nanopowders; seeding; hydrothermal; hot-pressing; transparent ceramic
• ISSN: 1996-1944; 1996-1944

In this study, the combination of hydrothermal technique and seed-doping method was conducted to coordinately control the formation of fine MgO-Y O powders, which are promising mid-infrared materials applied to hypersonic aircraft windows due to their excellent infrared transmissions over wide regions. Y(NO ) ·6H O, Mg(NO ) ·6H O, Y O seeds and MgO seeds were used as raw materials to prepare the MgO-Y O composite powders (50:50 vol.%), and the influences of the seed contents and hydrothermal treatment temperatures on the final powders and hot-pressed ceramics were investigated by XRD, SEM and TEM techniques. The results show that powders with a seed content of 5% that are hydrothermally synthesized at 190 °C can present a better uniformity and dispersion with a particle size of ~125 nm. Furthermore, the ceramics prepared with the above powders displayed a homogenous two-phase microstructure, fewer pores and a fine grain size with Y O of ~1 µm and MgO of ~620 nm. The present study may open an avenue for developing transparent ceramics based on MgO-Y O nanopowders prepared by hydrothermal technique.