Carbon Nanotube Reinforced Composites: Metal and Ceramic ...

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Figure 4.8 Texture analysis of Mg/1.3 wt% MWNT nanocomposite showing (a) ð1010Þ, (0 0 0 2) and ð1011Þ pole figures and (b) alignment of basal and non-basal planes according to the pole figure results. Reproduced with permission from [19]. Copyright Ó (2008) Elsevier. 4.2 Tensile Deformation Behaviorj113 inhomogeneous distribution of nanotubes. The primary yield strength can be estimated theoretically from modified shear-lag equations (Equations 4.5 and 4.6). The results are listed in Table 4.4. Apparently, modified shear-lag model predictions agree reasonably with the experimentally measured data. To obtain homogeneous dispersion of nanotubes in a copper matrix, the molecular level mixing method was used to prepare the Cu/5 vol% MWNT and Cu/10 vol% MWNT nanocomposites. The resulting composite powders were then spark plasma sintered at 550 C for 1 min [Chap. 2, Ref. 86, Chap. 2, Ref. 87, Chap. 2, Ref. 89]. Figure 4.10(a) shows compressive stress–strain curves of pure Cu and its nanocomposites. The variation of elastic modulus and yield strength with nanotube content is shown in Figure 4.10(b). The Cu/MWNT nanocomposites only exhibit one yield
114j 4 Mechanical Characteristics of Carbon Nanotube–Metal Nanocomposites Figure 4.9 (a) Tensile stress–strain curves of pure Cu and Cu/MWNT nanocomposites. (b) Variation of elastic modulus, yield and tensile strengths with nanotube content. The nanocomposites were prepared by spark plasma sintering of ballmilled Cu nanopowder and MWNT mixture followed by cold rolling. Reproduced with permission from [Chap. 2, Ref. 81]. Copyright Ó (2006) Elsevier. Table 4.4 Experimental and shear-lag predicted yield strength of Cu/MWNT nanocomposites. Volume content of MWNT (%) Volume content of Cu/MWNT composite region (%) S eff of Cu/MWNT composite region Primary yield strength (MPa) 5 6.3 3.2 149 151 10 12.7 4.8 197 180 Reproduced with permission from [Chap. 2, Ref. 81]. Copyright Ó (2006) Elsevier. Theoretical primary yield strength (MPa)
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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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164j 5 Carbon Nanotube-Ceramic Nano
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170j 6 Physical Properties of Carbo
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186j 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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