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Sintering of Nanopowders of Amorphous Silicon Nitride Under Ultrahigh Pressure

Published online by Cambridge University Press:  31 January 2011

Ya-Li Li ,
Yong Liang ,
Fen Zheng ,
Xian-Feng Ma  and
Suo-Jing Cui
Ya-Li Li*
Affiliation:
Department of Micro-Crystalline and Laser Processing, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015, People's Republic of China
Yong Liang
Affiliation:
Department of Micro-Crystalline and Laser Processing, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015, People's Republic of China
Fen Zheng
Affiliation:
Department of Micro-Crystalline and Laser Processing, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110015, People's Republic of China
Xian-Feng Ma
Affiliation:
Laboratory of Ultrahigh Pressure, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 159 Renming Street, Changchun 130022, People's Republic of China
Suo-Jing Cui
Affiliation:
Laboratory of Ultrahigh Pressure, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 159 Renming Street, Changchun 130022, People's Republic of China
*
a)Address all correspondence to this author. Present address: National Institute for Research in Inorganic Materials, Research Center for Advanced Materials, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. e-mail: yalili@nirim.go.jp
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Abstract

Nanopowders of amorphous silicon nitride were densified and sintered without additives under ultrahigh pressure (1.0–5.0 GPa) between room temperature and 1600 °C. The powders had a mean diameter of 18 nm and contained ∼5.0 wt% oxygen that came from air-exposure oxidation. Sintering results at different temperatures were characterized in terms of sintering density, hardness, phase structure, and grain size. It was observed that the nanopowders can be pressed to a high density (87%) even at room temperature under the high pressure. Bulk Si3N4 amorphous and crystalline ceramics (relative density: 95–98%) were obtained at temperatures slightly below the onset of crystallization (1000–1100 °C) and above 1420 °C, respectively. Rapid grain growth occurred during the crystallization leading to a grain size (>160 nm) almost 1 order of magnitude greater than the starting particulate diameters. With the rise of sintering temperature, a final density was reached between 1350 and 1420 °C, which seemed to be independent of the pressure applied (1.0–5.0 GPa). The densification temperature observed under the high pressure is lower by 580 °C than that by hot isostatic pressing sintering, suggesting a significantly enhanced low-temperature sintering of the nanopowders under a high external pressure.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 4 , April 2000 , pp. 988 - 994
Copyright
Copyright © Materials Research Society 2000

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