Aligned Single-Crystalline β-Si3N4 Whiskers Prepared with SHS Process

Authors

  • Min Xia,

    Corresponding author
    1. Institute of Powder Metallurgy and Advanced Ceramics, Southwest Jiaotong University, Chengdu 610031, (China)
    • Institute of Powder Metallurgy and Advanced Ceramics, Southwest Jiaotong University, Chengdu 610031, (China)
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  • Changchun Ge,

    1. Institute of Powder Metallurgy and Advanced Ceramics, Southwest Jiaotong University, Chengdu 610031, (China)
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  • Hongyan Guo

    1. Institute of Special Ceramics and Powder Metallurgy, University of Science & Technology Beijing, Beijing 10083, (China)
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  • The work was based on the 25 years SHS work in Institute of Special Ceramics and Powder Metallurgy, University of Science & Technology Beijing. Thanks to Prof. Z. J. Zhou, Q. Z. Yan, W. P. Shen, Y. G. Cao, J. T. Li, K. X. Chen and undergraduate student L. M. Zhang.

  • This paper was amended in issue 3 of Advanced Engineering Materials because there was a mistake in the Early View publication.

Abstract

Aligned single-crystalline β-Si3N4 whiskers with high aspect ratio were first prepared via a Self-propagating high temperature-synthesis (SHS) process, by using tungsten powders as catalysts. The as-synthesized Si3N4 whiskers typically have uniform diameters of 400 nm, length about 200 µm, and exhibit smooth and straight surfaces. Above all, the products possesses a perfect aligned structure, which is quite different from the reported β-Si3N4 whiskers. Elastic bending modulus of individual whiskers was measured by in-situ TEM process, the average value of elastic bending modulus of individual as-synthesized whiskers was 488 GPa. Results revealed that tungsten powders plays an significant effects on the morphology of Si3N4 whiskers.

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