31. Fabrication of Strengthened and Toughened Intra-Type Ceramic Matrix Nanocomposites using a Soaking Method

  1. Dongming Zhu and
  2. Kevin Plucknett
  1. Seong-Min Choi,
  2. Takuya Matsunaga,
  3. Sawao Honda,
  4. Shinobu Hashimoto,
  5. Yoshitomo Kobayashi and
  6. Hideo Awaji

Published Online: 26 MAR 2008

DOI: 10.1002/9780470291238.ch31

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3

How to Cite

Choi, S.-M., Matsunaga, T., Honda, S., Hashimoto, S., Kobayashi, Y. and Awaji, H. (2005) Fabrication of Strengthened and Toughened Intra-Type Ceramic Matrix Nanocomposites using a Soaking Method, in Advances in Ceramic Coatings and Ceramic-Metal Systems: Ceramic Engineering and Science Proceedings, Volume 26, Number 3 (eds D. Zhu and K. Plucknett), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291238.ch31

Author Information

  1. Nagoya Institute of Technology Goldso-cho, Showa-ku, Nagoya, JAPAN Nagoya, Aichi, 466-8555

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2005

ISBN Information

Print ISBN: 9781574982336

Online ISBN: 9780470291238

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Keywords:

  • monolithic;
  • alumina;
  • microstructure;
  • ceramics;
  • microscopy

Summary

We proposed strengthening and toughening mechanisms of nanocomposites based on dislocation activities in brittle ceramics. We took notice that an intra-type nano-structure could only have the potential to improve strength and fracture toughness due to dislocations formed around the dispersed particles. In this work, we prepared nickel dispersed alumina composites powders with 10 wt% α-alumina as a seeds using a novel soaking method and sintered by pulse electric current sintering (PECS) technique. The maximum strength of the alumina-nickel nanocomposites was 984 MPa after being sintered at 1450 °C, where the specimen size was 2×2×10 mm3. The maximum fracture toughness was 5.5 MPa·m1/2 after being sintered at 1350 °C measured by a single edge V-notched beam (SEVNB) method. The specimen sintered at 1350 °C with seeds was carried out heat-treatment under Ar atmosphere. We changed heat-treatment temperature from 800 °C to 1000 °C and keeping time at that temperature from 0 min to 10 min. The value of fracture strength after heat-treatment showed similar mat with before heat-treatment However, the fracture toughness was remarkably increased to 7.6 MPa·m1/2 in annealed specimen at 800 °C for 5 min. This fracture toughness value showed about 2 times larger than that of monolithic alumina.