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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.118  No.1381 (September) (2010)  >  pp.847-854

Journal of the Ceramic Society of Japan
<<Previous article Vol.118  No.1381 (September) (2010)   pp.847 - 854 Next article>>

Fabrication and mechanical properties of high-dispersion-treated carbon nanofiber/alumina composites

Naoki UEDA1), Tomohiko YAMAKAMI1), Tomohiro YAMAGUCHI1), Kunio KITAJIMA1), Yuki USUI2), Kaoru AOKI2), Takefumi NAKANISHI3), Fumiaki MIYAJI3), Morinobu ENDO1), Naoto SAITO4) and Seiichi TARUTA1)
1) Faculty of Engineering, Shinshu University
2) Shinshu University School of Medicine
3) Japan Medical Materials Corporation
4) Department of Applied Physical Therapy, Shinshu University School of Health Sciences

  High-dispersion-treated carbon nanofibers (CNFs) were used to fabricate uniformly-dispersed CNFs-alumina composites with enhanced mechanical properties. The treatment was effective in obtaining dense and uniform composites. The composites containing 0.4–0.8 wt % CNFs were densified to a relative density of more than 99% by vacuum sintering and subsequent hot isostatic pressing, and those containing 1.6–2.5 wt % CNFs were densified to full density by plasma activated sintering. The maximum bending strength of the composites (1050 MPa) was approximately the same as the bending strength of monolithic alumina (1079 MPa). The maximum fracture toughness of the composites was 5.9 MPa·m0.5, which was a 69% increase compared with the fracture toughness of monolithic alumina (3.5 MPa·m0.5). Fracture toughness (KIC) increased rapidly with a decrease in alumina grain size (G), and we found that the relationship could be expressed by the following equation: KIC = (k1/G2) + k2 (where k1 and k2 are constants).

Carbon nanotube, Alumina, Composites, Sintering, Microstructure development, Mechanical properties

Received: May 11, 2010
Accepted: June 17, 2010 , Published online: September 01, 2010
Copyright (c) 2010 The Ceramic Society of Japan



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