Fabrication of dense Si<sub>3</sub>N<sub>4</sub> ceramics via coating amorphous Si<sub>3</sub>N<sub>4</sub> nano-powders by sodium reduction in liquid ammonia

DOI Web Site 20 References Open Access
  • WANG Qi
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
  • YANG Mei
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing State Key Laboratory of Biochemical Engineering, Institute of Process Engineering Chinese Academy of Sciences
  • ZHU Hongmin
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing Department of Metallurgy, Graduate School of Engineering, Tohoku University
  • XIAO Jiusan
    School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing

Bibliographic Information

Published
2017
DOI
  • 10.2109/jcersj2.16332
Publisher
The Ceramic Society of Japan

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Commercial Si3N4 powders coated with 0–30% amorphous Si3N4 nano-powders were fabricated successfully. Amorphous Si3N4 nano-powders coating were prepared through the reduction of silicon tetrachloride (SiCl4) by sodium in liquid ammonia at −45°C. Dense Si3N4 ceramics with 97.2% relative density of theoretic value were obtained from Si3N4 micro-powders coated with 30% nano-powders sintered by spark plasma sintering at 1500°C without sintering additives.

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