Reinforcement of alumina with surface modified carbon nanotubes

Go Yamamoto, Toshiyuki Hashida, Mamoru Omori, Hisamichi Kimura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


Multi-walled carbon nanotube (MWCNT) reinforced alumina composites were prepared by spark plasma sintering using pristine MWCNTs and acid-treated MWCNTs. The effect of acid treatment on the structure and surface potential of the MWCNTs was examined by transmission electron microscopy (TEM) and zeta potential analyzer. It is demonstrated that with the acid treatment of the MWCNTs, we have deliberately introduced nanoscale defects and negatively charged functional groups on the surface of the MWCNTs. The average depths of the defects are typically 4.8-10.8 nm. Mechanical measurements revealed that surface modification of the MWCNTs is effective in improvement of bending strength and fracture toughness of the MWCNT/alumina composites. Only 0.9 vol.% acid-treated MWCNT addition results in 27% and 25% simultaneous increases in bending strength (689.6 MPa) and fracture toughness (5.90 MPa m1/2), respectively.

Original languageEnglish
Title of host publicationMultiscale, Multifunctional and Functionally Graded Materials
PublisherTrans Tech Publications Ltd
Number of pages6
ISBN (Print)0878493077, 9780878493074
Publication statusPublished - 2010
Event10th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials, MM and FGMs - Sendai, Japan
Duration: 2008 Sep 222008 Sep 25

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Other10th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials, MM and FGMs


  • Carbon nanotubes
  • Ceramic-based composites
  • Mechanical properties
  • Nanostructures
  • Spark plasma sintering
  • Surface modification

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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