Paper Title:
Preparation and Characterization of Rod-Like β-Si3N4 Seeds
  Abstract

The purpose of this paper is to demonstrate a method of preparation of rod-like β-Si3N4 seeds for self-reinforced silicon nitride ceramics. β-Si3N4 seeds with different size and aspect ratios have been well developed by means of heating the mixture of α-Si3N4 containing various contents of β-Si3N4 powder with certain additives at 1800°С for holding different time under 0.5MPa nitrogen gas. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were performed to investigate the morphology, phase transformation and secondary phase. The influence of the proportion of β-Si3N4 in the initial α-Si3N4 powder on seeds size and morphology was investigated. The uniform β-Si3N4 seeds with controllable size and aspect ratios obtained through the β-Si3N4 addition can be explained by an increased heterogeneous nucleation, and MgO was more effective for enhancing the grain growth by the decreased viscosity.

  Info
Periodical
Key Engineering Materials (Volumes 280-283)
Edited by
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
Pages
1223-1226
DOI
10.4028/www.scientific.net/KEM.280-283.1223
Citation
J. Yang, B. Wang, J. Q. Gao, J. F. Yang, G. J. Qiao, H. J. Wang, Z. H. Jin, "Preparation and Characterization of Rod-Like β-Si3N4 Seeds", Key Engineering Materials, Vols. 280-283, pp. 1223-1226, 2005
Online since
February 2007
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$32.00
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