| 用聚碳硅烷为先驱体制备SiC/Si3N4纳米复相陶瓷 |
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| 引用本文： | 钟仁志,张长瑞,周新贵,周安郴,陈远志.用聚碳硅烷为先驱体制备SiC/Si3N4纳米复相陶瓷[J].复合材料学报,1999,16(4):13-16. |
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| 作者姓名： | 钟仁志 张长瑞 周新贵 周安郴 陈远志 |
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| 作者单位： | 国防科技大学材料工程与应用化学系, 长沙 410073 |
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| 摘 要： | 采用聚碳硅烷(PCS) 为先驱体, 利用原位生长法制备SiC/Si3N4 纳米复相陶瓷, 其室温弯曲强度和断裂韧性达到了637M Pa 和8. 10M Pa·m1/2 。研究了材料微观结构的形成及断裂机理,指出在微观结构的形成过程中, 控制SiC 纳米微晶的生成和B-Si3N4 柱状晶的生长是关键, 而增韧补强的主要原因在于形成了晶内型结构和长径比大(大于7. 5) 的Si3N4 柱状晶, 从而改变了断裂机理。
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| 关 键 词： | 先驱体 聚碳硅烷 原位生长法 SiC/Si3N4 纳米复相陶瓷 |
| 收稿时间： | 1997-11-27 |
| 修稿时间： | 1998-08-15 |
STUDY OF SiC/Si3N4 NANO COMPOSITES BY USING POLYCARBOSILANE AS PRECURSOR |
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| Zhong Renzhi,Zhang Changrui,Zhou Xingui,Zhou Anchen,Chen Yuanzhi.STUDY OF SiC/Si3N4 NANO COMPOSITES BY USING POLYCARBOSILANE AS PRECURSOR[J].Acta Materiae Compositae Sinica,1999,16(4):13-16. |
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| Authors: | Zhong Renzhi Zhang Changrui Zhou Xingui Zhou Anchen Chen Yuanzhi |
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| Affiliation: | Dept. of Materials Engineering and Applied Chemistry, National University of Defense Technology, Changsha 410073 |
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| Abstract: | A cost effective SiC/Si3N4 nano composite was obtained by in situ synthesis of precursor, using polycarbosilane as precursor. The results showed that the ambitious flexural strength and fracture toughness of this material had improved. The formation of this composites microstructure and the mechanism of fracture were discussed at the same time.It was important to control the formation of SiC nano crystals and the growth of rod like β Si3N4 grain.The formation of the intragranular structure and the rod like β Si3N4 grains(aspect ratio more than 7.5) was the reason for the improvement properties. |
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| Keywords: | precursor polycarbosilane in situ synthesis SiC/Si 3N 4 nano composite |
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