Development of CNT/Si3N4 composites with improved mechanical and electrical properties
Development of CNT/Si3N4 composites with improved mechanical and electrical properties
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开发具有改进机械和电性能的CNT/Si3N4复合材料
DOI：
10.1016/j.compositesb.2006.02.006
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发表时间：
2006
影响因子：
13.1
通讯作者：
P. Arató
中科院分区：
文献类型：
--
作者：
C. Balázsi;B. Fényi;N. Hegman;Zsuzsanna Kövér;F. Wéber;Z. Vértesy;Z. Kónya;I. Kiricsi;L. Biró;P. Arató
通过热等静压制备了不同含量（1、3或5wt%）碳纳米管的氮化硅基复合材料。相比之下，已制造出含有 1、5 或 10wt% 炭黑和石墨的复合材料。已经对制造工艺进行了优化，在高温烧结过程中提供了完整的碳纳米管。在添加1或3wt%碳纳米管的情况下，烧结过程中气压的增加导致弯曲强度的增加。研究发现，通过正确设计的烧结参数实现的微观结构特征是强度提高的主要因素。扫描电镜显示碳纳米管与氮化硅颗粒表面有良好的接触。添加碳的氮化硅基体的电性能可能会发生本质变化。
Silicon nitride based composites with different amount (1, 3 or 5wt%) of carbon nanotubes have been prepared by using hot isostatic pressing. Composites with 1, 5 or 10wt% carbon black and graphite have been manufactured, in comparison. Optimisation of the manufacturing processes has been performed, providing intact carbon nanotubes during high temperature sintering. In the case of 1 or 3 wt% carbon nanotube addition, the increase of gas pressure during sintering resulted in an increase of bending strength. It was found that microstructure features achieved by properly designed sintering parameters are the main responsible factors for the strength improvements. Scanning electron microscopy showed that carbon nanotubes have a good contact to the surface of silicon nitride grains. The electrical properties of silicon nitride matrices with carbon addition may change essentially.