Evaluation of Mechanical Properties and Microstructures of Multi-Walled Carbon Nanotube/Alumina Composites Prepared by Pressureless Sintering

• NOZAKA Yo

  Graduate School of Environment Studies, Tohoku University

• YAMAMOTO Go

  東北大学大学院工学研究科附属エネルギー安全科学国際研究センター

• SHIRASU Keiichi

  東北大学大学院環境科学研究科

• OMORI Mamoru

  東北大学大学院工学研究科附属エネルギー安全科学国際研究センター

• TAKAGI Toshiyuki

  東北大学流体科学研究所

• HASHIDA Toshiyuki

  東北大学大学院工学研究科附属エネルギー安全科学国際研究センター

Bibliographic Information

Other Title

• 常圧焼成法により作製したカーボンナノチューブ/アルミナ複合材料の機械的特性および微細組織評価に関する研究

Abstract

Alumina ceramics reinforced with multi-walled carbon nanotubes (MWCNTs) have been prepared by pressureless sintering. Resultant composites with the MWCNT contents up to 0.9 vol.% have shown relative density as high as 98%. In addition, with increasing the MWCNT contents up to 0.9 vol.%, bending strength and fracture toughness of the composites is found to be increase gradually, and the composite containing 0.9 vol.% MWCNTs have shown 18% and 32% simultaneous increases in bending strength (699.1 ± 46.1 MPa) and fracture toughness (5.33 ± 0.03 MPa·m^1/2), respectively, compared with MWCNT-free alumina. Observations on the fracture surface and the tensile-loading experiments of MWCNTs using an in-situ SEM method with a nanomanipulator system demonstrate that the MWCNTs, rather than pulling out from the alumina matrix, tend to fail in so-called “clean break” manner. Theoretical calculations imply that tougher ceramics with MWCNT can be obtained by creating the appropriate interaction between the matrix and MWCNT: not too week but also not too strong to permit an adequate load transfer between the two parts and thus a consequent pulling out without breakage of MWCNT. For the design of tougher ceramics with MWCNTs, appropriate modification of fiber/matrix interface will be one of important factors.

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 79 (802), 764-768, 2013

  The Japan Society of Mechanical Engineers

Keywords

• Carbon Nanotube
• Composite Material
• Ceramics
• Mechanical Properties
• Microstructure

Details

• CRID: 1390001204477272320
• NII Article ID: 130003374658
• DOI: 10.1299/kikaia.79.764
• ISSN: 18848338
• ISSN: 03875008
• Web Site: https://www.jstage.jst.go.jp/article/kikaia/79/802/79_764/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed