Articles
  • Thermal conductivity of micro hot-pressed AlN ceramics fabricated using a conventional MoSi2 heating element furnace
  • Chih-Peng Lina,*, Chih-Hung Chub, Shaw-Bing Wenc and Yun-Hwei Shenb
  • a Department of Leisure and Recreation Management, Diwan College of Management, Tainan 721, Taiwan b Department of Resources Engineering, National Cheng Kung University, Tainan 701, Taiwan c General Education Center, Meiho Institute of Technology, Neipu, Pingtung 912, Taiwan
Abstract
AlN samples doped with sub-micron Y2O3 and CaO powders as sintering additives obtained using the micro hot-pressed (MHPed) sintering method in a MoSi2 heating element furnace were investigated. The minor amounts of secondary phases were identified as Al5Y3O12, CaYAl3O7, and CaAl4O7, which are related to the low sintering temperature as well as the removal of oxygen-related defects in the system. Relative densities of over 96% of the theoretical value were obtained after sintering at 1600 oC for 8 h, indicating that an adequate amount of additives and the use of the micro hot-pressed (MHPed) sintering process help improve the densification and thermal conductivity of AlN ceramics. The high thermal conductivity of 130Wm−1K−1 was attributed to the purification of the AlN lattice, the elimination of some secondary phases, and the grain boundary phase distribution.

Keywords: Aluminum nitride, Sub-micron, Micro hot-pressed, Thermal conductivity, MoSi2 heating element

This Article

  • 2011; 12(5): 525-529

    Published on Oct 31, 2011