The effect of carbon nanotubes microstructures on reinforcing properties of SWNTs/alumina composite

Wei, Tong; Fan, Zhuangjun; Li, Guohua; Wei, Fei; Zhao, Dongyu; Fan, Jinpeng

doi:10.1016/j.materresbull.2007.10.026

Cited by 32 publications

(22 citation statements)

References 10 publications

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“…14),29), 35) It is considered that they might be caused in the composites which contained CNTs having a moderate amount of defect (D/G = 0.59 in this study) and had larger average alumina grain sizes (more than 2.1¯m in this study). On the other hand, some fractured CNFs exposed their inner-walls in the crack, as shown by arrows in Fig.…”

Section: Fracture Toughness Of Compositesmentioning

confidence: 88%

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

Ueda

Yamakami

Yamaguchi

et al. 2012

J. Ceram. Soc. Japan

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In this study, carbon nanofibers (CNFs) having different amounts of defect were prepared by acid-treating for 0.5, 1 and 5 h and were combined with alumina. Then, the influence of the amount of defect on the CNFs on microstructure development of the CNFs/alumina composites and relationship between the fracture toughness and the average alumina grain size was investigated. The intensity ratio of D-band to G-band (D/G) in Raman spectra of the CNFs increased from 0.34 for pristine CNFs to 0.95 for the CNFs acid-treated for 5 h with the acid-treatment time, which indicates that the amount of defect on the CNFs increased with the acid-treatment time. The alumina grain growth in the dense composites sintered at 12001300°C was not influenced by the amount of defect on the CNFs, however, the composite containing CNFs having the moderate amount of defect (D/G = 0.56) showed the slowest alumina grain growth rate at 13501450°C. The fracture toughness of the composites containing the CNFs acid-treated for 0.5 h increased with a decrease in average alumina grain size and reached 5.6 MPa·m 0.5 at the average alumina grain size of 0.84¯m, which was 60% higher value compared to monolithic alumina (3.5 MPa·m 0.5 ). However, fracture toughness of the composites containing CNFs acid-treated for 1 and 5 h increased with a decrease in average alumina grain size, showed the maximum values of 5.0 and 4.5 MPa·m 0.5 at average alumina grain sizes of 1.3 and 1.6¯m, respectively, and decreased as the average alumina grain size decreased further. The maximum fracture toughness of the composite containing the CNFs acidtreated for 5 h was lower than that of the composite containing the CNFs acid-treated for 1 h.

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Section: Fracture Toughness Of Compositesmentioning

confidence: 88%

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

Ueda

Yamakami

Yamaguchi

et al. 2012

J. Ceram. Soc. Japan

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“…2,6,10,16 Relatively few reports discuss CNT-reinforced ceramics, with the majority of those reports discussing alumina (Al 2 O 3 ). 2,10,[17][18][19][20][21][22][23][24][25][26][27]28 Several key problems exist in the fabrication of CNT-Al 2 O 3 composites. 20,23 The first problem is dispersion of CNTs in the Al 2 O 3 matrix.…”

Section: Introductionmentioning

confidence: 99%

“…One is the in situ synthesis of CNTs on ceramic powders, which has been reported by several research groups. 4,10,19,28 In this process, ceramic powders are mixed with fine transition metal particles, such as Fe, Co or Ni, which serve as the catalyst for CNT growth. Gases that serve as carbon sources, such as CH 4 -H 2 4,10 or C 2 H 2 -Ar-H 2 , 18,28 are then flowed through the powders.…”

Section: Introductionmentioning

confidence: 99%

Pressureless sintering of carbon nanotube–Al2O3 composites

Zhang

Fahrenholtz

Hilmas

et al. 2010

Journal of the European Ceramic Society

136

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“…In Figure 9(c), the nanotubes are pulled out from the grains, the pulled-out length is very short, nearly 100 nm. It suggests that there is good bonding between the nanotubes and matrix, which is beneficial to improve the composite toughness [31,32].…”

Section: Mechanical Properties and Microstructure Of Samplesmentioning

confidence: 99%

“…Crack induced by indentation were produced to investigate the toughening mechanism [31]. In the CR/QP samples, CNTs bridging structure are clearly illustrated in Figure 10(a), which can restrain the crack from prolongation and then toughen the ceramics.…”

Section: Mechanical Properties and Microstructure Of Samplesmentioning

confidence: 99%

Ultra-fast densification of CNTs reinforced alumina based on combustion reaction and quick pressing

Huang

Zhang

et al. 2011

Sci. China Technol. Sci.

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An ultra-fast densification method based on high heating rate from the combustion reaction for producing carbon nanotubes (CNTs) reinforced alumina ceramics is reported. The heat generated by combustion reaction is adopted to act as a high temperature source to the sample, which results in a heating rate of 1660°C/min of the sample. Then a great mechanical pressure is applied to the sample when the sample gets the expected temperature. The densification process is finished in several minutes. The results indicate that the densification method is beneficial to protect the CNTs from destruction and creates good interfacial combination between the nanotubes and the matrix. With the addition of 1 wt% CNTs, the fracture toughness of the ceramics prepared increases about 50%. carbon nanotubes, alumina, combustion reaction, quick pressing Citation: Fu Z Y, Huang L W, Zhang J Y, et al. Ultra-fast densification of CNTs reinforced alumina based on combustion reaction and quick pressing. Sci China Tech Sci, 2012, 55: 484489,

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The effect of carbon nanotubes microstructures on reinforcing properties of SWNTs/alumina composite

Cited by 32 publications

References 10 publications

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

Microstructure development and fracture toughness of acid-treated carbon nanofibers/alumina composites

Pressureless sintering of carbon nanotube–Al2O3 composites

Ultra-fast densification of CNTs reinforced alumina based on combustion reaction and quick pressing

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