期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 31, 期 3, 页码 391-400出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2010.10.020
关键词
Single-wall carbon nanotubes; High-temperature materials; Thermal properties; Electrical properties; Composites
资金
- Robert Welch Foundation of Texas [C1494]
- NSF-AGEP at Rice University [HRD-9817555]
- Carbon Nanotechnologies Inc.
- NASA-URETI [NC-01-0203]
- NASA Ames Research Center [NNA04CK63A]
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies
- U. S. Department of Energy [DE-AC05-00OR22725]
Si3N4 nanocomposites reinforced with 1-, 2-, and 6-vol% single-walled carbon nanotubes (SWNTs) were processed using spark plasma sintering (SPS) in order to control the thermal and electrical properties of the ceramic. Only 2-vol% SWNTs additions were used to decrease the room temperature thermal conductivity by 62% over the monolith and 6-vol% SWNTs was used to transform the insulating ceramic into a metallic electrical conductor (92 S m(-1)). We found that densification of the nanocomposites was inhibited with increasing SWNT concentration however, the phase transformation from alpha- to beta-Si3N4 was not. After SPS, we found evidence of SWNT survival in addition to sintering induced defects detected by monitoring SWNT peak intensity ratios using Raman spectroscopy. Our results show that SWNTs can be used to effectively increase electrical conductivity and lower thermal conductivity of Si3N4 due to electrical transport enhancement and thermal scattering of phonons by SWNTs using SPS. (C) 2010 Elsevier Ltd. All rights reserved.
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