Sintering of nanopowders of amorphous silicon nitride under ultrahigh pressure
文献类型：期刊论文
| 作者 | Y. L. Li ; Y. Liang ; F. Zheng ; X. F. Ma ; S. J. Cui |
| 刊名 | Journal of Materials Research
 |
| 出版日期 | 2000 |
| 卷号 | 15期号:4页码:988-994 |
| 关键词 | sinterable ceramic powders laser-driven reactions |
| ISSN号 | 0884-2914 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/37096]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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