Mechanical Properties of Si3N4/BN Composites by Chemical Processing

T. Kusunose, Y. H. Choa, T. Sekino, K. Niihara

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The Si3N4/BN nanocomposites containing up to 15vol% hexagonal BN (h-BN) were fabricated by hot-pressing α-Si3N4 powders on which turbostratic BN (t-BN) with disordered layer structure was coated partly. The t-BN coating on α-Si3N4 particles was prepared by heating α-Si3N4 particles covered with a mixture of boric acid and urea in hydrogen gas. TEM observations of this nanocomposite revealed that nano-sized h-BN particles were homogeneously dispersed within Si3N4 grains as well as at grain boundaries. The strength and thermal shock resistance were significantly improved in comparison with the Si3N4/BN microcomposites.

Original languageEnglish
Pages (from-to)475-480
Number of pages6
JournalKey Engineering Materials
Volume161-163
Publication statusPublished - 1999 Jan 1
Externally publishedYes

Keywords

  • Boric Acid
  • Boron Nitride
  • Silicon Nitride
  • Thermal Shock Resistance
  • Urea

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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