Crack-healing effectiveness of nano Ni + SiC Co-dispersed alumina hybrid materials

Daisuke Maruoka, Yoku Sato, Makoto Nanko

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

11 Citations (Scopus)

Abstract

Crack-healing effectiveness of nano-Ni+SiC co-dispersed Al 2O3 hybrid materials by heat treatment was studied as well as oxidation behavior. The starting powder mixture was prepared by drying slurry consisting of distilled water, Al2O3, SiC powder and nickel nitrate. After reduction, the powder mixture was densified by pulsed electric current sintering. Cracks were introduced by a Vickers indenter. Specimens were exposed into air at temperature ranging from 1000 and 1300° C for 1 and 48 h. Thickness of oxidized zone in SiC+nano-Ni/Al2O 3 thinner than nano-Ni/Al2O3. Cracks of SiC+nano-Ni/Al2O3 disappeared completely, for example, by oxidation at 1200° C for 6 h, as same as nano-Ni/Al2O 3. Bending strength of crack-disappeared SiC+nano-Ni/Al 2O3 showed 519 MPa and was comparable with that of as-sintered one. SiC+nano-Ni/Al2O3 pocesses crack-healing effectiveness with improved high-temperature oxidation resistance.

Original languageEnglish
Title of host publicationTHERMEC 2009 Supplement
Pages365-370
Number of pages6
DOIs
Publication statusPublished - 2010
Externally publishedYes
Event6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
Duration: 2009 Aug 252009 Aug 29

Publication series

NameAdvanced Materials Research
Volume89-91
ISSN (Print)1022-6680

Other

Other6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009
CountryGermany
CityBerlin
Period09/8/2509/8/29

Keywords

  • AlO
  • Bending strength
  • Crack-healing
  • High-temperature oxidation
  • Nanocomposite
  • Pulsed electric current sintering

ASJC Scopus subject areas

  • Engineering(all)

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