- 作者: Cheng-Yu Hsieh, Chun-Nan Lin, Hung-Jia Chen Shyan-Lung Chung, Jiping Cheng and Dinesh K. Agrawal
- 中文摘要: --
- 英文摘要: We report our preliminary study on microwave sintering of a combustion synthesized AlN powder. The combustion synthesis method was previously developed by Chung et al. at National Cheng Kung University, and is characterized by simple processing, fast production, low cost, high product purity, and being capable of mass production. The AlN product obtained from this synthesis method was ground to have average particle sizes of 0.9μm (AlN-1) and 3.0 μm (AlN-2) for sintering experiments. Yttrium oxide was added to the AlN powder as sintering aid. The microwave sintering experiments were carried out at the Microwave Processing and Engineering Center in the Pennsylvania State University. The samples were sintered by microwave at 2.45 GHz in a multi-mode cavity. The power used ranged from 200W to 1 Kw, and the sintering temperature ranged from 1600°C to 2000°C. The AlN-1 powder was sintered to ~99% of theoretical density at a sintering temperature of 1800°C with a soaking time of 30 min and a Y2O3 content of 3-5 wt%. The AlN-2 powder was less sinterable than AlN-1 and 97.3% of theoretical density was obtained at a sintering temperature of 2000°C with a soaking time of 30 min and a Y2O3 content of 5 wt%. The thermal conductivities reached 122 and 132 W/m.K for the specimens made from AlN-1 and AlN-2, respectively, when 5 wt% of Y2O3 was added. Effects of several important parameters on the thermal conductivity were discussed.
- 中文關鍵字: --
- 英文關鍵字: --