Effect of heating rate on spark plasma sintering of a nanosized β-Si3N4-Based Powder

Ching Huan Lee, Horng Hwa Lu, Chang An Wang, Pramoda K. Nayak, Jow Lay Huang

研究成果: Article

23 引文 斯高帕斯(Scopus)

摘要

A nanosized β-Si3N4-based powder doped with sintering additives of 6 wt% Al2O3 and 8 wt% Y 2O3 were sintered by spark plasma sintering at different heating rates. The in situ shrinkage curves were measured to identify the densification mechanism during the rise in temperature. At slower heating rates (50 and 100°C/min), the nanosized grains are maintained after sintering at 1600°C for 5 min, while anisotropic grain growth is accelerated above 1500°C by applying a rapid heating cycle (200°C/min). In addition to the dynamic Ostwald ripening that occur during the sintering process, the presence of Morié fringes and dislocations is attributed to grain rotation and misfit strain between the subgrains and elongated, large grains. Grain coalescence is found to occur in the rapid heating process.

原文English
頁(從 - 到)1182-1190
頁數9
期刊Journal of the American Ceramic Society
94
發行號4
DOIs
出版狀態Published - 2011 四月 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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