Carbon Nanotube Reinforced Composites: Metal and Ceramic ...

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Figure 5.13 (a) FTIR of amorphous Al2O3/MWNT composite powders before and after calcination process; (b) SEM micrograph of the composite powder surface showing homogeneous dispersion and incorporation of CNTs into amorphous Al2O3 powder. Reproduced with permission from [72]. Copyright Ó (2005) Elsevier. 5.4 Oxide-Based Nanocompositesj147 nanocomposites inherit the beneficial properties of reinforcing MWNTs and SiC nanoparticles, leading to improvement in fracture toughness, bending strength and hardness of the hybrids. Figure 5.15(a) shows a SEM fractograph of the Al2O3/(1 vol% MWNT þ 1 vol% SiC) hybrid nanocomposite. MWNTs are mainly dispersed along grain boundaries of alumina, forming a network microstructure. SiC nanoparticles can only be seen in the TEM micrograph as shown in Figure 5.15(b). The fracture mode of hybrid is mixed intergranular and transgranular mode. 5.4.1.3 Plasma Spraying Very recently, Agarwal s group employed the plasma spraying process to form Al 2O 3/ 4 wt% MWNT and Al2O3/8 wt% MWNT nanocomposite coatings [76, 77]. They indicated that the Al2O3 nanopowder (150 nm) cannot be plasma sprayed because it has a high tendency to form clogs at the plasma gun nozzle. To facilitate the flowability of the nanopowder, a spray-drying pretreatment for nanopowder was needed. Spray-drying involves the dispersion of nanopowder in an aqueous organic binder to form a slurry followed by atomization. Spray-drying of Al2O3 nanopowder results in the formation of spherical agglomerates of 35 mm (designated as A-SD). A-SD powder was then blended with 4 wt% MWNT in a jar mill to form the powder feedstock (designated as A4C-B) for plasma spraying (Figure 5.16). In another approach, mixed alumina nanopowder and MWNT of different contents were spray-dried to form the A4C-SD or A8C-SD feedstock. Figure 5.17(a) and (c) show SEM micrographs of A4C-B, A4C-SD and A8C-SD powders. Apparently, MWNTs are dispersed only on the surface of A4C-B powder, but are dispersed throughout the powder agglomerates of A4C-SD and A8C-SD.
148j 5 Carbon Nanotube–Ceramic Nanocomposites Figure 5.14 Schematic diagrams showing hybrid microstructure design of alumina reinforced with MWNTs and SiC nanoparticles. Reproduced with permission from [75]. Copyright Ó (2008) Elsevier. Figure 5.15 (a) SEM and (b) TEM micrographs of Al 2O 3/(5 vol% MWNT þ 1 vol% SiC) hybrid. Inset in (b) is HRTEM image showing a sharp and clean SiC/alumina interface. Reproduced with permission from [75]. Copyright Ó (2008) 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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Page 111 and 112: 96j 3 Physical Properties of Carbon
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Page 201 and 202: 186j 7 Mechanical Properties of Car
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198j 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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