Pressureless sintering of transparent AlON ceramic with assimilable γ‐Al <sub>2</sub> O <sub>3</sub> as sintering promoting additives
Zhao Feng, Xu Huang, Dan Chen, Zhijun Liao, Jianqi Qi, Tien‐Chang Lu
Abstract
Abstract Transparent aluminum oxynitride (AlON) ceramic was successfully fabricated without doping sintering additive by the pressureless sintering method. Γ‐Al 2 O 3 nano‐powder that can be assimilated by the AlON matrix was used for promoting the densification of AlON during the sintering. The sintering behavior of AlON and the effects of γ‐Al 2 O 3 nano‐powder on the phase, hardness, and transmittance of AlON have been investigated in detail. The mechanisms of γ‐Al 2 O 3 nano‐powder on the AlON green body modifying and the sintering promoting are revealed. The transmittance of the AlON ceramic is dramatically enhanced by doping γ‐Al 2 O 3 nano‐powder and the 2 mm thick sample doped with 2.5 wt% γ‐Al 2 O 3 nano‐powder shows an inline transmittance above 81% at 1500 nm.