Contact damage of machinable aluminum nitride/ boron nitride nanocomposites

Takafumi Kusunose, Tohru Sekino, Yoichi Ando

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

AlN/BN nanocomposites indicated such a unique property as machinable with high fracture strength. In order to investigate the deformation mechanism of AlN/BN nanocomposites, Hertzian contact tests were performed on monolithic AlN, and nano-composite and microcomposite AlN/BN. The monolith and microcomposite comprised micro-sized grains of AlN and BN. In the microcomposite, plate-like BN particles preferentially oriented perpendicular to the hot-press direction. On the other hand, the nanocomposite showed a finer microstructure with fine BN particles and small matrix grains. These microstructural differences led to differences in the mechanism of contact damage. The damage of the monolithic AlN and the AlN/BN micro-composite exhibited collapsed Hertzian cone fracture and preferentially oriented large cracks perpendicular to the hot-press direction, whereas the damage observed in the nanocomposites appeared to be quasi-plastic deformation.

Original languageEnglish
Pages (from-to)762-766
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume116
Issue number1354
DOIs
Publication statusPublished - 2008 Jun

Keywords

  • Aluminum nitride
  • Boron nitride
  • Contact damage
  • Machinable
  • Quasi-plastic

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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