TY - JOUR
T1 - Microstructure-property relationships in pressureless-sintered carbon nanotube/alumina composites
AU - Yamamoto, Go
AU - Shirasu, Keiichi
AU - Nozaka, Yo
AU - Wang, Weili
AU - Hashida, Toshiyuki
N1 - Funding Information:
The authors thank Mr. T. Miyazaki of Technical Division, School of Engineering, Tohoku University, for technical assistance in the TEM analysis. This research was partially supported by the Grant-in-Aid for Scientific Research (S) 21226004 and Grant-in-Aid for JSPS Fellows 243582 and 2402358 . This work was performed under the Inter-university Cooperative Research Program (Proposal no. 13G0205 ) of the Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2014/11/3
Y1 - 2014/11/3
N2 - Microstructure-property relationships of pressureless-sintered multi-walled carbon nanotube (MWCNT)/alumina composites have been investigated using four types of MWCNTs having different mechanical characteristics as well as almost the same diameter and length; the influences of grain size, location of MWCNTs, fracture patterns, dispersion states of MWCNTs, and crack bridging characteristics of MWCNTs on the composites' mechanical properties have been explored. It has been found that the improvement in bending strength and fracture toughness observed for all types of the composites was primarily attributable to the grain refining effect by adding the MWCNTs and to the energy-dissipation by a MWCNT debonding and pullout, respectively. The number and size of clustered MWCNTs were increased in response to the increase in the MWCNT content, which resulted in the decrease in mechanical properties. The pressureless-sintered composites made with MWCNTs having larger load-bearing ability led to ~25% and ~45% improvement in bending strength (742.6±13.1MPa) and fracture toughness (5.83±0.19MPam1/2), respectively, than a MWCNT-free alumina.
AB - Microstructure-property relationships of pressureless-sintered multi-walled carbon nanotube (MWCNT)/alumina composites have been investigated using four types of MWCNTs having different mechanical characteristics as well as almost the same diameter and length; the influences of grain size, location of MWCNTs, fracture patterns, dispersion states of MWCNTs, and crack bridging characteristics of MWCNTs on the composites' mechanical properties have been explored. It has been found that the improvement in bending strength and fracture toughness observed for all types of the composites was primarily attributable to the grain refining effect by adding the MWCNTs and to the energy-dissipation by a MWCNT debonding and pullout, respectively. The number and size of clustered MWCNTs were increased in response to the increase in the MWCNT content, which resulted in the decrease in mechanical properties. The pressureless-sintered composites made with MWCNTs having larger load-bearing ability led to ~25% and ~45% improvement in bending strength (742.6±13.1MPa) and fracture toughness (5.83±0.19MPam1/2), respectively, than a MWCNT-free alumina.
KW - Carbon nanotubes
KW - Ceramics
KW - Composites
KW - Mechanical properties
KW - Microstructures
KW - Pressureless sintering
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U2 - 10.1016/j.msea.2014.08.068
DO - 10.1016/j.msea.2014.08.068
M3 - Article
AN - SCOPUS:84908021954
SN - 0921-5093
VL - 617
SP - 179
EP - 186
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -