Carbon Nanotube Reinforced Composites: Metal and Ceramic ...

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Figure 7.23 Coefficient of friction vs sliding distance for amorphous alumina matrix, thin- and thick-walled Al2O3/MWNT nanocomposites, tested with the pin-on-disk method. Reproduced with permission from [30]. Copyright Ó (2008) Elsevier. lower friction at low loading. Figure 7.25 shows the frictional force vs normal force at the nanoscale. The coefficients of friction for porous alumina matrix, thin- and thickwalled nanocomposites are determined to be 0.147, 0.142 and 0.073, respectively. The thick-walled nanocomposite again exhibits the lowest coefficient of friction at the Figure 7.24 Coefficient of friction vs scratching distance for amorphous alumina matrix, thin- and thick-walled Al2O3/MWNT nanocomposites. Reproduced with permission from [30]. Copyright Ó (2008) Elsevier. 7.6 Wear Behaviorj211
212j 7 Mechanical Properties of Carbon Nanotube–Ceramic Nanocomposites Figure 7.25 Frictional force vs apllied normal load for amorphous alumina matrix, thin- and thick-walled Al2O3/MWNT nanocomposites, measured with atomic force microscopy. Reproduced with permission from [30]. Copyright Ó (2008) Elsevier. nanoscale. The difference in the wear behavior of thin- and thick-walled nanocomposites is considered to be associated with the unique contact condition at the frictional interface and the buckling behavior of nanotubes. For the thin-walled nanocomposite, the nanotubes buckle readily, thus the sliding ball tip of wear tester at macroscale can directly contact with the matrix. The multiasperity contacting mode results in a high coefficient of friction. On the other hand, the thick-walled nanotubes are stiffer and resist buckling, thus can mechanically support the matrix during the wear test, provided that the applied loads are not too high. References 1 Newman, J.C. (1984) A review of Chevron-notched fracture specimens, in Chevron-notched specimens: testing and stress analysis (ASTM STP 855) (eds J.H. Underwood, W.E. Freiman and F.I. Baratta), American Society for Testing and Materials, Philadephia, PA, pp. 5–31. 2 Gogotsi, G.A. (2002) Fracture toughness studiesonceramics and ceramic particulate composites at different temperatures, in Fracture Resistance Testing of Monolithic and Composite Brittle Materials (ASTM STP 1409) (eds J.A. Salem, G.D. Quinn and M.G.Jenkins),AmericanSocietyforTesting and Materials, West Conshohocken, PA, pp.199–212. 3 ASTM C1421-99 (1999) Standard Test Method for the Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature, American Society for Testing and Materials, Philadelphia, PA. 4 Gogotsi, G.A. (2003) Fracture toughness of ceramics and ceramic composites. Ceramics International, 29, 777–784. 5 Mukhopadhyay, A.K., Datta, S.K. and Chakraborty, D. (1999) Fracture toughness of structural ceramics. Ceramics International, 25, 447–454.
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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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