Pressureless sintering of highly transparent AlON ceramics with CaCO3 doping

摘要

Employing CaCO3 as sintering additive, highly transparent aluminum oxynitride (AlON) ceramics were pressurelessly fabricated from AlON powder at 1870 degrees C during150 min. The transmittance of the AlON doped with 03-0.4 wt% CaCO3 is up to 83-85% at similar to 3700 nm for 2 mm thickness samples, and their transmittances are consistently higher than that of the AlON doped with the ideal amount of Y2O3 at wavelength ranging from 200 nm to 6000 nm. The AlON doped with CaCO3 exhibits the transmittance of 71% at 4800 nm (typical band for infrared targeting), which is higher by 6% than that of the doped Y2O3. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.