Synthesis and sintering of silicon nitride nano-powders via sodium reduction in liquid ammonia

Mei Yang; Qi Wang; Mingli Lv; Hongmin Zhu

doi:10.1016/j.jeurceramsoc.2016.01.030

Synthesis and sintering of silicon nitride nano-powders via sodium reduction in liquid ammonia

Mei Yang, Qi Wang, Mingli Lv, Hongmin Zhu

ENG - Metallurgy

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Nano-sized silicon nitride powders were synthesized through the reduction of silicon tetrachloride (SiCl₄) by sodium in liquid ammonia at around -40 °C.The product was in uniform particles of several nanometers, and in the amorphous form. The amorphous structure was stable up to 1200 °C and turned to the crystal structure of α-Si₃N₄ at 1300 °C, and then to β-Si₃N₄ structure when heated at temperatures higher than 1450 °C.Via spark plasma sintering (SPS) dense bulks with 97.9% relative density of theoretic value and the grain size of 100-300 nm was successfully fabricated at 1500 °C without any sintering additives.

Original language	English
Pages (from-to)	1899-1904
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	36
Issue number	8
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2016.01.030
Publication status	Published - 2016 Jul 1

Keywords

Liquid ammonia
Nano-sized silicon nitride powders
Sodium Reduction
Spark plasma sintering

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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title = "Synthesis and sintering of silicon nitride nano-powders via sodium reduction in liquid ammonia",

abstract = "Nano-sized silicon nitride powders were synthesized through the reduction of silicon tetrachloride (SiCl4) by sodium in liquid ammonia at around -40 °C.The product was in uniform particles of several nanometers, and in the amorphous form. The amorphous structure was stable up to 1200 °C and turned to the crystal structure of α-Si3N4 at 1300 °C, and then to β-Si3N4 structure when heated at temperatures higher than 1450 °C.Via spark plasma sintering (SPS) dense bulks with 97.9% relative density of theoretic value and the grain size of 100-300 nm was successfully fabricated at 1500 °C without any sintering additives.",

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T1 - Synthesis and sintering of silicon nitride nano-powders via sodium reduction in liquid ammonia

AU - Yang, Mei

AU - Wang, Qi

AU - Lv, Mingli

AU - Zhu, Hongmin

PY - 2016/7/1

Y1 - 2016/7/1

N2 - Nano-sized silicon nitride powders were synthesized through the reduction of silicon tetrachloride (SiCl4) by sodium in liquid ammonia at around -40 °C.The product was in uniform particles of several nanometers, and in the amorphous form. The amorphous structure was stable up to 1200 °C and turned to the crystal structure of α-Si3N4 at 1300 °C, and then to β-Si3N4 structure when heated at temperatures higher than 1450 °C.Via spark plasma sintering (SPS) dense bulks with 97.9% relative density of theoretic value and the grain size of 100-300 nm was successfully fabricated at 1500 °C without any sintering additives.

AB - Nano-sized silicon nitride powders were synthesized through the reduction of silicon tetrachloride (SiCl4) by sodium in liquid ammonia at around -40 °C.The product was in uniform particles of several nanometers, and in the amorphous form. The amorphous structure was stable up to 1200 °C and turned to the crystal structure of α-Si3N4 at 1300 °C, and then to β-Si3N4 structure when heated at temperatures higher than 1450 °C.Via spark plasma sintering (SPS) dense bulks with 97.9% relative density of theoretic value and the grain size of 100-300 nm was successfully fabricated at 1500 °C without any sintering additives.

KW - Liquid ammonia

KW - Nano-sized silicon nitride powders

KW - Sodium Reduction

KW - Spark plasma sintering

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Synthesis and sintering of silicon nitride nano-powders via sodium reduction in liquid ammonia

Abstract

Keywords

ASJC Scopus subject areas

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