Sintering of nanopowders of amorphous silicon nitride under ultrahigh pressure

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	Sintering of nanopowders of amorphous silicon nitride under ultrahigh pressure
	Y. L. Li; Y. Liang; F. Zheng; X. F. Ma; S. J. Cui
	2000
发表期刊	Journal of Materials Research
ISSN	0884-2914
卷号	15 期号:4 页码:988-994
摘要	Nanopowders of amorphous silicon nitride were densified and sintered without additives under ultrahigh pressure (1.0-5.0 GPa) between room temperature and 1600 degrees C. The powders had a mean diameter of 18 nm and contained similar to 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 degrees C and above 1420 degrees 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 degrees 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 degrees C than that by hot isostatic pressing sintering, suggesting a significantly enhanced low-temperature sintering of the nanopowders under a high external pressure.
部门归属	chinese acad sci, inst met res, dept microcrystalline & laser proc, shenyang 110015, peoples r china. chinese acad sci, changchun inst appl chem, lab ultrahigh pressure, changchun 130022, peoples r china.;li, yl (reprint author), natl inst res inorgan mat, ctr adv mat res, 1-1 namiki, tsukuba, ibaraki 3050044, japan
关键词	Sinterable Ceramic Powders Laser-driven Reactions
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WOS记录号	WOS:000086368700024
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/37096
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. L. Li,Y. Liang,F. Zheng,et al. Sintering of nanopowders of amorphous silicon nitride under ultrahigh pressure[J]. Journal of Materials Research,2000,15(4):988-994.
APA	Y. L. Li,Y. Liang,F. Zheng,X. F. Ma,&S. J. Cui.(2000).Sintering of nanopowders of amorphous silicon nitride under ultrahigh pressure.Journal of Materials Research,15(4),988-994.
MLA	Y. L. Li,et al."Sintering of nanopowders of amorphous silicon nitride under ultrahigh pressure".Journal of Materials Research 15.4(2000):988-994.