- Densification and Some Properties of Carbon Nanotubes-Dispersed Al2O3 Nanocomposite Powders
-
Seung-Hwa Yoo, Jae-Kyo Yang, Sung-Tag Oh, Kae-Myung Kang, Sung-Goon Kang, Yong-Ho Choa
-
J Korean Powder Metall Inst. 2005;12(6):393-398.
-
DOI: https://doi.org/10.4150/KPMI.2005.12.6.393
-
-
 Abstract
 PDF
- In-situ processing route was adopted to disperse carbon nanotubes (CNTs) into Al_2O_3 powders homogeneously. The Al_2O_3 composite powders with homogeneous dispersion of CNTs could be synthesized by a catalytic route for in-situ formation of CNTs on nano-sized Fe dispersed Al_2O_3 powders. CNTs/Fe/Al_2O_3 nanopowders were densified by spark plasma sintering (SPS). The hardness and bending strength as well as electrical conductivity increased with increasing sintering temperature. However, the electrical conductivity of the composites sintered at above 1500°C showed decreased value with increasing sintering temperature due to the oxidation of CNTs.
- Synthesis and Characterization of CNTs/Metal/Al2O3 Nanocomposite Powders by Thermal CVD
-
Yong-Ho Choa, Seung-Hwa Yoo, Jae-Kyo Yang, Sung-Tag Oh, Sung-Goon Kang
-
J Korean Powder Metall Inst. 2005;12(2):146-150.
-
DOI: https://doi.org/10.4150/KPMI.2005.12.2.146
-
-
Abstract
PDF
- An optimum route to synthesize Al_2O_3-based composite powders with homogeneous dispersion of carbon nanotubes (CNTs) was investigated. CNTs/Metal/Al_2O_3 nanocomposite powders were fabricated by thermal chemical vapor deposition of C_2H_2 gas over metal/Al_2O_3 nanocomposite catalyst prepared by selective reduction of metal oxide/Al_2O_3 powders. The FT-Raman spectroscopy analysis revealed that the CNTs have single- and multi-walled structure. The CNTs with the diameter of 25-43 nm were homogeneously distributed in the metal/Al_2O_3 powders, and their characteristics were strongly affected by a kind of metal catalyst and catalyst size. The experimental results show that the composite powder with required size and dispersion of CNTs can be realized by control of synthesis condition.
|
kpmi
