Paper Title:
Densification and α/β Phase Transformation of SHS Si3N4 Containing Al2O3 and Y2O3 during Sintering
  Abstract

The densification and phase transformation of high α-phase silicon nitride powder synthesized by SHS with a combination of Y2O3 and Al2O3 sintering additives were investigated. The densification process occurred rapidly from 1400 to 1500 °C and was nearly finished at 1500 °C. However, the α-β transformation of silicon nitride progressed rapidly from 1500 to 1600 °C, and completed at 1600 °C. The phase transformation of silicon nitride lagged behind the densification of Si3N4 ceramics. It showed that the solution and precipitation process did not play the main role in the densification of silicon nitride. The sufficient amount of liquid phase was crucial to complete the densification.

  Info
Periodical
Materials Science Forum (Volumes 561-565)
Main Theme
Edited by
Young Won Chang, Nack J. Kim and Chong Soo Lee
Pages
577-580
DOI
10.4028/www.scientific.net/MSF.561-565.577
Citation
L. Bai, C. C. Ge, W. P. Shen, K. Zhang, X.D. Mao, "Densification and α/β Phase Transformation of SHS Si3N4 Containing Al2O3 and Y2O3 during Sintering", Materials Science Forum, Vols. 561-565, pp. 577-580, 2007
Online since
October 2007
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