|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fundamental Aspects and Modeling Powder Metal Synthesis and Processing
||Optimization of Temperature Regime of Spark Plasma Sintering of AlON Powder
||Yingchun s Shan, Xialu Wei, Xiannian Sun, Geuntak Lee, Jiujun Xu, Eugene A Olevsky
|On-Site Speaker (Planned)
Using bimodal pure aluminum oxynitride (AlON) powder synthesized by carbothermal reduction and nitridation method, including 0.5% Y2O3 as a sintering additive, AlON ceramics are fabricated by spark plasma sintering (SPS) at different sintering temperatures. Relative density of ≥99.86% is achieved for all the obtained AlON ceramics samples sintered at 1400-1550°C after holding for 10min under 40MPa. The observed phase assemblages of sintered samples strongly depend on the sintering temperature due to the phase transformations between AlON, α-Al2O3 and AlN. Single phase AlON ceramics are obtained when sintering temperature is greater than 1500°C. The measured maximum infrared transmittance for 1.2mm thick samples is 70.2%, which is similar to the one obtained in samples pressureless sintered for 30min at 1880°C . Therefore, the conducted study indicates that sintering temperature and holding time needed to fabricate transparent AlON ceramics by SPS can be lowered by 380°C and 20min, respectively.