Abstract
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 degrees 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 degrees C without sintering additives. (C) 2017 The Ceramic Society of Japan. All rights reserved.
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