Carbon Nanotube Reinforced Composites: Metal and Ceramic ...

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Figure 7.11 Relative density (r.d.) and mechanical properties of monolithic Al2O3, Al2O3/1 vol% SiC composite and Al2O3/(MWNT þ SiC) hybrids. Reproduced with permission from [Chap. 5, Ref. 75]. Copyright Ó (2008) Elsevier. 7.3 Oxide-Based Nanocompositesj199
200j 7 Mechanical Properties of Carbon Nanotube–Ceramic Nanocomposites [Chap. 5, Ref. 76, Chap. 5, Ref. 77]. The fracture toughness of alumina (A-SD) coating is 3.22 0.22 MPa m 1/2 and increases to 3.862 0.16 MPa m 1/2 by adding 4 wt% MWNT (A4C-B) coating. The fracture toughness increases to 4.60 0.27 MPa m 1/2 in the A4C-SD coating due to improved MWNTdispersion. It is further improved to 5.04 0.58 MPa m 1/2 by adding 8 wt% MWNT (A8C-SD). The enhanced toughness of the alumina/MWNT nanocomposite coating is attributed to the CNT bridge formation, crack deflection and MWNT pull-out [24]. 7.3.2 Silica Matrix Ning et al. fabricated the SiO 2/MWNT nanocomposites by direct powder mixing in ethanol and hot pressing at 1300 C under 25 MPa in nitrogen atmosphere for 30 min [Chap. 5, Ref. 87]. As conventional powder mixing and hot pressing were used, the dispersion of MWNTs in silica matrix is inhomogeneous (Figure 7.12(a) and (b)). Agglomeration of nanotubes is more apparent at 10 vol% MWNT. Thus, the bending strength and fracture toughness of silica can improve by adding only 5 vol% MWNT. These mechanical properties degrade markedly with further increasing nanotube content (Figure 7.13). In another study, Ning et al. fabricated the SiO2/5 vol% MWNT nanocomposite by the sol-gel method with and without C 16TAB surfactant. The resulting powder mixtures were also hot pressed at 1300 C under 25 MPa in nitrogen atmosphere [Chap. 5, Ref. 89]. They reported that the bending strength and fracture toughness of the SiO2/5 vol% MWNT nanocomposite are 70.2 5 MPa and 2.18 0.15 MPa m 1/2 , respectively. And the bending strength and fracture toughness of the SiO2/(5 vol% MWNT þ C16TAB) nanocomposite are 97.0 10 MPa and 2.46 0.11 MPa m 1/2 , respectively. Compared with the mechanical properties of the SiO2/5 vol% MWNT nanocomposite prepared by conventional powder mixing as shown in Figure 7.13, sol-gel prepared SiO 2/(5 vol% MWNT þ C 16TAB) nanocomposite exhibits higher bending stress and toughness due to better dispersion of CNTs in silica matrix. Guo et al. [25] employed colloidal dispersion followed by attrition milling and SPS to produce the SiO2/5 vol% MWNT and SiO2/10 vol% MWNT nanocomposites. Figure 7.12 (a) Low and (b) high magnification SEM fractographs of SiO2/5 vol% MWNT nanocomposite. Reproduced with permission from [Chap. 5, Ref. 87]. Copyright Ó (2003) 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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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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