Carbon Nanotube Reinforced Composites: Metal and Ceramic ...

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Figure 7.20 Variation of r.d. with CNT content for Al2O3/MWNT nanocomposites prepared by hot pressing and tape casting. Reproduced with permission from [28]. Copyright Ó (2005) Elsevier. alumina matrix. In another study, Lim and coworkers [29] also demonstrated that the hot-pressed Al2O3/CNT nanocomposites prepared by catalytic pyrolysis of acetylene gas with an iron nitrate impreganated alumina exhibit similar wear behavior to that of the Al2O3/MWNT nanocomposites as shown in Figure 7.21. A Figure 7.21 Variation of weight loss with CNT content for Al2O3/ MWNT nanocomposites prepared by hot pressing and tape casting. Reproduced with permission from [28]. Copyright Ó (2005) Elsevier. 7.6 Wear Behaviorj209
210j 7 Mechanical Properties of Carbon Nanotube–Ceramic Nanocomposites Figure 7.22 Variation of friction coefficient with CNT content for Al2O3/MWNT nanocomposites prepared by hot pressing and tape casting. Reproduced with permission from [28]. Copyright Ó (2005) Elsevier. minimum wear loss is also observed at 4 wt% CNT; the weight loss then increases with increasing filler content. They attributed this to the low densification of in situ Al2O3/CNT nanocomposites at higher filler contents. Very recently, Xia et al. [30] studied the dry sliding wear behavior of well-aligned Al2O3/MWNT nanocomposites at macro-, micro- and nanoscales by means of the pin-on-disk, microscratch and atomic force microscopy. Aligned Al2O3/MWNT nanocomposites were synthesized through template synthesis using AAO coatings of different thicknesses. Both thin-walled (5 nm) and thick-walled (12 nm) nanotubes were synthesized inside the nanopores accordingly. They reported that the frictional coefficient of the nanocomposites tested at macro-, micro- and nanoscales depends on the buckling behavior of the nanotubes and applied loading. Figure 7.23 shows the coefficient of friction vs sliding distance for porous alumina matrix and aligned Al2O3/MWNT nanocomposites with thin- and thick-walled CNTs at macroscale determined from the pin-on-disk test. The coefficient of friction of porous alumina matrix is about 0.9 and remains nearly constant during testing. The coefficient of friction of thin-walled nanocomposite is slightly lower than that of alumina matrix. However, the thick-wall nanocomposite exhibits a very low coefficient of friction (0.2) at the onset of sliding. The coefficient of friction then increases with the sliding distance but still remains lower than that of the thin-walled counterpart. Figure 7.24 shows the coefficient of friction vs scratching distance for porous alumina matrix and aligned Al2O3/MWNT nanocomposites for the three materials subjected to the microscratch test. The alumina matrix and thin-walled nanocomposite have nearly the same coefficient of friction while the thick-walled nanocomposite displays
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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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100j 3 Physical Properties of Carbo
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102j 3 Physical Properties of Carbo
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104j 4 Mechanical Characteristics o
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132j 5 Carbon Nanotube-Ceramic Nano
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Page 231 and 232: Table 8.1 Patent processes for maki
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Page 243: 228j Index l laser ablation 7 load
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