Crack healing of nano-Ni/Al2O3 hybrid materials via high-temperature oxidation

Daisuke Maruoka, Makoto Nanko

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

6 Citations (Scopus)

Abstract

Crack-healing effectiveness was investigated on 5 vol% nano-Ni dispersed Al2O3 hybrid materials. Influence of the Y or Si doping or SiC co-dispersion was also studied on the crack healing behavior. Cracks were introduced by a Vickers indentation to be a crack length of approximately 60 μm. Cracks of nano-Ni/Al2O3 were completely disappeared, for example, by oxidation at 1200°C for 6 h in air, Y/Si doped one and SiC co-dispersed one have similar performance of crack disappearance. Bending strength of crack-disappeared samples showed about 550 MPa and was comparable or improved with that of as-sintered one. Mechanism of crack healing was considered as filling up of cracks by NiAl2O4 oxidation product which is developed by outward diffusion of cations at grain boundary of Al2O3matrix. Nano-Ni/Al2O 3 with Y or Si doping or SiC co-dispersion are realized to have crack-healing effectiveness with improved high-temperature oxidation resistance.

Original languageEnglish
Title of host publicationHigh-Temperature Oxidation and Corrosion 2010, ISHOC-10
PublisherTrans Tech Publications Ltd
Pages378-383
Number of pages6
ISBN (Print)9783037852354
DOIs
Publication statusPublished - 2011
Externally publishedYes
Event3rd International Symposium on High-Temperature Oxidation and Corrosion, ISHOC-10 - Zushi, Japan
Duration: 2010 Nov 82010 Nov 11

Publication series

NameMaterials Science Forum
Volume696
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other3rd International Symposium on High-Temperature Oxidation and Corrosion, ISHOC-10
CountryJapan
CityZushi
Period10/11/810/11/11

Keywords

  • Bending strength
  • Crack healing
  • Grain boundary diffusion
  • High temperature oxidation resistance
  • Nanocomposite
  • Pulsed electric current sintering

ASJC Scopus subject areas

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

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