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

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1182-1190
Number of pages9
JournalJournal of the American Ceramic Society
Volume94
Issue number4
DOIs
Publication statusPublished - 2011 Apr 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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