TY - JOUR
T1 - Effects of processing conditions on microstructure, electrical conductivity and mechanical properties of MWCNT/alumina composites prepared by flocculation
AU - Wang, Weili
AU - Yamamoto, Go
AU - Shirasu, Keiichi
AU - Nozaka, Yo
AU - Hashida, Toshiyuki
N1 - Funding Information:
The authors wish to thank Dr. T. Miyazaki of the Technical Division, Schoolof Engineering, Tohoku University for their technical assistance in the TEM analysis. This research was partially supported by a Grant-in-Aid for Exploratory Research 26630005 , a Grant-in-Aid for Scientific Research (S) 21226004 and a Grant-in-Aid for JSPS Fellows 243582 and 2402358 . This work was performed under the Inter-university Cooperative Research Program (Proposal no. 14G0211) of the Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University.
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/11/1
Y1 - 2015/11/1
N2 - MWCNT/alumina composites were prepared by a flocculation method combined with acid treatment of the MWCNTs and spark plasma sintering. The effects of varying the processing conditions, namely the acid treatment temperature (50-80 °C), MWCNT content (0-10 vol.%) and sintering temperature (1200-1600°C) on the composites' microstructure, electrical conductivity and mechanical properties were investigated. This found that flocculation processing brings about a good dispersibility of the MWCNTs, especially with higher acid treatment temperature, which enhances their reinforcing and grain refining effect. When combined with a low sintering temperature, this significantly improves the mechanical properties of the composites.As a result, a composite prepared using a sintering temperature of 1200°C and an acid treatment temperature of 80°C exhibited a fracture toughness greater than that of a monolithic alumina, even with a MWCNT content as high as 10 vol.%.
AB - MWCNT/alumina composites were prepared by a flocculation method combined with acid treatment of the MWCNTs and spark plasma sintering. The effects of varying the processing conditions, namely the acid treatment temperature (50-80 °C), MWCNT content (0-10 vol.%) and sintering temperature (1200-1600°C) on the composites' microstructure, electrical conductivity and mechanical properties were investigated. This found that flocculation processing brings about a good dispersibility of the MWCNTs, especially with higher acid treatment temperature, which enhances their reinforcing and grain refining effect. When combined with a low sintering temperature, this significantly improves the mechanical properties of the composites.As a result, a composite prepared using a sintering temperature of 1200°C and an acid treatment temperature of 80°C exhibited a fracture toughness greater than that of a monolithic alumina, even with a MWCNT content as high as 10 vol.%.
KW - Alumina
KW - Carbon nanotubes
KW - Flocculation method
KW - Mechanical properties
KW - Microstructure
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U2 - 10.1016/j.jeurceramsoc.2015.06.027
DO - 10.1016/j.jeurceramsoc.2015.06.027
M3 - Article
AN - SCOPUS:84939254882
SN - 0955-2219
VL - 35
SP - 3903
EP - 3908
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 14
ER -