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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.125  No.6 (June) (2017)  >  pp.509-512

Journal of the Ceramic Society of Japan
<<Previous article Vol.125  No.6 (June) (2017)   pp.509 - 512 Next article>>

Fabrication of dense Si3N4 ceramics via coating amorphous Si3N4 nano-powders by sodium reduction in liquid ammonia

Qi WANG1), Mei YANG1) 2), Jiusan XIAO1), Hongmin ZHU1) 3)
1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing 2) State Key Laboratory of Biochemical Engineering, Institute of Process Engineering Chinese Academy of Sciences 3) Department of Metallurgy, Graduate School of Engineering, Tohoku University

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.


Keyword:
Si3N4, Nano-powders, Liquid ammonia, Spark plasma sintering

Received: January 14, 2017
Accepted: March 31, 2017 , Published online: June 01, 2017

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