| Preparation and properties of multi-wall carbon nanotube/SiC composites by aqueous tape casting |
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| 摘 要： | MWCNTS/SiC composites were fabricated by aqueous tape casting. High solid content (50 vol%) SiC slurries with sintering additives and multi-wall carbon nanotubes (MWCNTs) as reinforcements were prepared using Tetramethylammonium hydroxide as the dispersant. The stability of MWCNTs/SiC slur-ries was studied and characterized in terms of zeta potential and rheology measurements. The relative density of the composite was about 98% after hot-pressing at 1850℃ (at 25 MPa in Ar for 30 min). The hardness of the composites decreased with the increase in MWCNTs content. The flexural strength and the fracture toughness were 742.17 MPa and 4.63 MPa·m1/2, respectively when the MWCNTs content was 0.25 wt%. Further increase in MWCNTs content to 0.50 wt% did not lead to the increase in mechanical properties. Most of MWCNTs were found to be located at SiC grain boundaries and the pull out of the MWCNTs was observed.
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| 收稿时间： | 10 November 2010 |
Preparation and properties of multi-wall carbon nanotube/SiC composites by aqueous tape casting |
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| Authors: | ZhiHui Lü DongLiang Jiang JingXian Zhang QingLing Lin |
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| Affiliation: | (1) State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100049, China |
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| Abstract: | MWCNTS/SiC composites were fabricated by aqueous tape casting. High solid content (50 vol%) SiC slurries with sintering additives
and multi-wall carbon nanotubes (MWCNTs) as reinforcements were prepared using Tetramethylammonium hydroxide as the dispersant.
The stability of MWCNTs/SiC slurries was studied and characterized in terms of zeta potential and rheology measurements. The
relative density of the composite was about 98% after hot-pressing at 1850°C (at 25 MPa in Ar for 30 min). The hardness of
the composites decreased with the increase in MWCNTs content. The flexural strength and the fracture toughness were 742.17
MPa and 4.63 MPa·m1/2, respectively when the MWCNTs content was 0.25 wt%. Further increase in MWCNTs content to 0.50 wt% did not lead to the increase
in mechanical properties. Most of MWCNTs were found to be located at SiC grain boundaries and the pull out of the MWCNTs was
observed.
Supported by the Shanghai Key Program for Basic Research (Grant No. 06JC14071) |
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| Keywords: | SiC MWCNTs tape casting |
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