Carbon Nanotube Reinforced Composites: Metal and Ceramic ...

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Figure 5.9 SEM images of (a) fractured and (b) polished/ion-milled Al2O3/3 vol% MWNT nanocomposite. White dots in (b) are MWNTs. The circles and arrows indicate CNTs at the grain boundaries and within the grains, respectively. Table 5.2 Spark plasma sintering conditions and the resultant properties of monolithic alumina and Al 2O 3/SWNT nanocomposites. Materials SPS conditions Relative density (%) Grain size (nm) Hardness (GPa) Al2O3 1150 C, 3 min 100 349 20.3 3.3 Al 2O 3/5.7 vol% SWNT 1150 C, 3 min 100 200 20.0 7.9 Al2O3/10 vol% SWNT 1150 C, 3 min 100 200 16.1 9.7 Al 2O 3/10 vol% SWNT 1150 C, 2 min 95.2 156 9.30 8.1 Al2O3/10 vol% SWNT 1100 C, 3 min 85.8 150 4.40 6.4 Reproduced with permission from [44]. Copyright Ó (2003) Nature Publishing Group. 5.4 Oxide-Based Nanocompositesj143 (c) and (d) are TEM images of polished/ionmilled nanocomposite showing the dispersion of nanotubes within the grains and at grain boundaries. Reproduced with permission from [68]. Copyright Ó (2008) Elsevier. Fracture toughness (MPa m 1/2 )
144j 5 Carbon Nanotube–Ceramic Nanocomposites Figure 5.10 SEM fractograph of Al 2O 3/5.7 vol% SWNT nanocomposite showing the nanotube network encompassing alumina grains. Reproduced with permission from [44]. Copyright Ó (2003) Nature Publishing Group. Murkerjee and coworkers further investigated the effect of SPS temperatures on the microstructure and mechanical properties of the Al2O3/10 vol% SWNT nanocomposite. The nanocomposite specimens were sintered at 1150, 1350 and 1550 C for 3 min [69, 70]. Figure 5.11 shows the Raman spectra of the Al2O3/10 vol% SWNT nanocomposite sintered at 1150, 1350 and 1550 C for 3 min. The Raman spectrum of pure SWNT is also shown for the purpose of comparison. For SWNT, the peak at 1350 cm 1 corresponds to the D-band associated with the presence of disorder or small sp 2 carbon crystallite. The peak at 1595 cm 1 is assigned to the G-band resulting from the vibration mode (C C stretching) of sp 2 -bonded carbon atoms. A shoulder at 1560–1575 cm 1 is due to the overlapping of electrons within graphene layers upon rolling the layers into nanotubes. From Figure 5.11, the Figure 5.11 Pulsed laser Raman spectra of Al 2O 3/10 vol% SWNT nanocomposite spark plasma sintered at 1150, 1350 and 1550 C for 3 min. The Raman spectrum of pristine SWNT is also shown for comparison. Reproduced with permission from [70]. Copyright Ó (2007) Elsevier.
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Sie Chin Tjong Carbon Nanotube Rein
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Sie Chin Tjong Carbon Nanotube Rein
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Contents Preface IX List of Abbrevi
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5 Carbon Nanotube-Ceramic Nanocompo
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Preface Carbon nanotubes are nanost
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XII List of Abbreviations HIP hot i
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1 Introduction 1.1 Background Compo
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Figure 1.2 Transmission electron mi
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1.3 Synthesis of Carbon Nanotubes 1
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MWNTs can be as high as 70% of the
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Figure 1.7 In situ TEM images recor
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1.3 Synthesis of Carbon Nanotubesj1
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show TEM images of MWNTs synthesize
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Since then, large efforts have been
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1.3.4 Patent Processes Carbon nanot
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1.4 Purification of Carbon Nanotube
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Table 1.3 Patent processes for the
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Figure 1.13 Schematic illustration
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1.5 Mechanical Properties of Carbon
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Figure 1.14 Carbon nanotubes in hig
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Figure 1.15 In situ tensile deforma
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Table 1.7 Theoretical and experimen
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Nomenclature ~a 1 , ~a 2 Unit vecto
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carbon nanotubes. Physical Review L
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70 Jang, I., Uh, H.S., Cho, H.J., L
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108 Shelimov, K.B., Esenaliev, R.O.
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Bonnamy, S., Beguin, F., Burnham, N
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2 Carbon Nanotube-Metal Nanocomposi
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isostatic pressing. In certain case
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This implies the absence of effecti
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coating material, the plasma gun an
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Table 2.4 Changes in the size and v
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Figure 2.6 (a) Low and (b) high mag
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Figure 2.8 SEM micrographs showing
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Figure 2.11 Bright field TEM microg
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Figure 2.13 TEM image of bulk Al/5
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2.5 Magnesium-Based Nanocomposites
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limited improvement in ultimate ten
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Figure 2.18 SEM micrographs of the
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Figure 2.19 (a) Low and (b) high ma
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Figure 2.22 SEM micrographs of (a)
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Figure 2.25 (a) TEM micrograph show
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2.8 Transition Metal-Based Nanocomp
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Figure 2.27 TEM image of electrodep
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Figure 2.29 SEM micrographs of (a)
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Figure 2.31 Schematic representatio
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einforcement content SiCp/Al compos
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Materials Science Forum, 534-536 (P
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composite. Materials Science and En
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111 Cha, S.I., Kim, K.T., Arshad, S
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90j 3 Physical Properties of Carbon
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194j 7 Mechanical Properties of Car
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Table 8.1 Patent processes for maki
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218j 8 Conclusions development of c
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220j 8 Conclusions Figure 8.2 TEM m
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222j 8 Conclusions increase in Vick
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224j 8 Conclusions References 1 Cha
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226j 8 Conclusions nano-matrix. Scr
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228j Index l laser ablation 7 load
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