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Journal of Materials Science

, Volume 42, Issue 13, pp 4792–4800 | Cite as

Fabrication of carbon nanofiber(CNF)-dispersed Al2O3 composites by pulsed electric-current pressure sintering and their mechanical and electrical properties

  • Ken HirotaEmail author
  • Yuichi Takaura
  • Masaki Kato
  • Yoshinari Miyamoto
Article

Abstract

Dense Al2O3-based composites (≥99.0% of theoretical) dispersed with carbon nanofibers (CNFs) were fabricated using the pulsed electric-current pressure sintering (PECPS) for 5 min at 1300°C and 30 MPa in a vacuum. The dispersion of CNFs into the matrix depended much on the particle size of the starting Al2O3 powders. Mechanical properties of the composites were evaluated in relation with their microstructures; high values of three-point bending strength σb (∼800 MPa) and fracture toughness K IC (∼5 MPa·m1/2) were attained at the composition of CNF/Al2O3 = 5:95 vol%, which σb and K IC values were ∼25% and ∼5%, respectively, higher than those of monolithic Al2O3. This might be due to the small Al2O3 grains (1.6 μm) of dense sintered compacts compared with that (4.4 μm) for the pure Al2O3 ceramics, resulting from the suppression of grain growth during sintering induced by uniformly dispersed CNFs in the matrix. Electrical resistivity of CNF/Al2O3 composites decreased rapidly from >1015 to ∼2.1 × 10−2 Ωm (5vol%CNF addition), suggesting the machinability of Al2O3-based composites by electrical discharge machining.

Keywords

Al2O3 Fracture Toughness Spark Plasma Sinter Carbon Nanofibers Fine Al2O3 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

This work was supported by a grant to Research Centre for Advanced Science and Technology at Doshisha University from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Ken Hirota
    • 1
    Email author
  • Yuichi Takaura
    • 1
  • Masaki Kato
    • 1
  • Yoshinari Miyamoto
    • 2
  1. 1.Department of Molecular Science and Technology, Faculty of EngineeringDoshisha UniversityKyotoJapan
  2. 2.Joining and Welding Research InstituteOsaka UniversityOsakaJapan

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