自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 16    No. 2    April 2009

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Preparation and sintering of nano Fe coated Si3N4 composite powders
YIN Rui-ming(银锐明)1, 2, FAN Jing-lian(范景莲)1, LIU Xun(刘 勋)1

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. College of Packaging and Material Engineering, Hunan University of Technology, Zhuzhou 412008, China

Abstract: Fe/Si3N4 composite powder was synthesized by the heterogeneous precipitation-thermal reduction process, and then pressed into flakes under a pressure of 10 MPa. Flakes were sintered by pressureless and hot-pressing at 1 600 ℃ under 0.1 MPa N2. The chemical composition, phases and microstructure of composite powder and sintered flakes were investigated by energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the structure of composite powders is Si3N4 coated by nano Fe. The crystal phases of sintered flakes by pressureless are Fe(Si) compound, SiC and Si3N4. The crystal phases of the sintered samples by hot-pressing are Fe, Fe(Si) compound and Si3N4. It is found that crystal phases flakes obtained by pressureless and hot-pressing are very different.

 

Key words: Fe; Si3N4; coating; heterogeneous precipitation; sintering

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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