Production of a grain boundary phase as conducting pathway in insulating AlN ceramics

Takafumi Kusunose, Tohru Sekino, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

We report that it is possible to render aluminum nitride (AlN) ceramics electrically conductive without losing their intrinsic high thermal conductivity by precipitating a yttrium oxycarbide grain boundary phase, the volume of which is about 1/20 that of the conducting phase in conventional ceramic composites. The electrical conductivity can be controlled by varying the sintering conditions and additive composition. In addition, the electrically conductive AlN can be shaped by electric discharge machining and converted back into insulating AlN by anodic oxidation.

Original languageEnglish
Pages (from-to)6170-6175
Number of pages6
JournalActa Materialia
Volume55
Issue number18
DOIs
Publication statusPublished - 2007 Oct

Keywords

  • Electrical conductivity
  • Grain boundary junctions
  • Liquid phase sintering
  • Nitrides
  • Thermal conductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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