Carbon Nanotube Reinforced Composites: Metal and Ceramic ...

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Figure 7.16 Microhardness as a function of CNT content for (a) SiC/MWNT and (b) SiC/SiC-coated MWNT nanocomposites. Reproduced with permission from [Chap. 5, Ref. 113]. Copyright Ó (2007) Elsevier. in fracture toughness of the nanocomposites by adding nanotubes with low aspect ratio (Type-B) as expected. 7.5 Nitride-Based Nanocomposites 7.5 Nitride-Based Nanocompositesj205 At present, only Si3N4/1% MWNT nanocomposite has been fabricated by conventional powder mixing and ball milling followed by either hipping or SPS treatment at elevated temperatures [Chap. 5, Ref. 43, Chap. 5, Ref. 119, Chap. 5, Ref. 120]. In general, ball milling of composite raw materials in ethanol does not yield adequate dispersion of nanotubes in silicon nitride matrix. In combination with high temperature consolidation, the beneficial effect of nanotube addition on mechanical properties of the Si3N4/1% MWNT diminishes. Table 7.5 lists the mechanical properties of monolithic Si3N4 and Si3N4/1 wt% MWNT nanocomposite prepared by SPS. The hardness values of nanocomposite sintered at 1500 and 1650 C are lower than those of monolithic silicon nitride sintered at these temperatures. The fracture toughness of nanocomposite spark plasma sintered at 1500 Cis comparable to that of monolithic Si3N4 fabricated at the same temperature. However, the toughness of nanocomposite sintered at 1650 C is inferior to that of Si3N4 fabricated at the same temperature.
206j 7 Mechanical Properties of Carbon Nanotube–Ceramic Nanocomposites Figure 7.17 Indentation fracture toughness s a function of CNT content for (a) SiC/MWNT and (b) SiC/SiC-coated MWNT nanocomposites. Reproduced with permission from [Chap. 5, Ref. 113]. Copyright Ó (2007) Elsevier. Figure 7.18 Fracture toughness vs CNT content for Si-C-N/ MWNT nanocomposites. Reproduced with permission from [Chap. 5, Ref. 117]. Copyright Ó (2006) 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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