Fabrication and microstructure of silicon nitride/boron nitride nanocomposites

Takafumi Kusunose, Tohru Sekino, Yong Ho Choa, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

135 Citations (Scopus)

Abstract

A chemical process for fabrication of Si3N4/BN nanocomposite was devised to improve the mechanical properties. Si3N4/BN nanocomposites containing 0 to 30 vol% hexagonal BN (h-BN) were successfully fabricated by hot-pressing α-Si3N4 powders, on which turbostratic BN (t-BN) with a disordered layer structure was partly coated. The t-BN coating on α-Si3N4 particles was prepared by reducing and heating α-Si3N4 particles covered with a mixture of boric acid and urea. TEM observations of this nanocomposite revealed that the nanosized hexagonal BN (h-BN) particles were homogeneously dispersed within Si3N4 grains as well as at grain boundaries. As expected from the rules of composites, Young's modulus of both micro- and nanocomposites decreased with an increase in h-BN content, while the fracture strength of the nanocomposites prepared in this work was significantly improved, compared with the conventional microcomposites.

Original languageEnglish
Pages (from-to)2678-2688
Number of pages11
JournalJournal of the American Ceramic Society
Volume85
Issue number11
Publication statusPublished - 2002 Nov 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Fabrication and microstructure of silicon nitride/boron nitride nanocomposites'. Together they form a unique fingerprint.

Cite this