Fabrication and characterization of aluminum nitride/boron nitride nanocomposites by carbothermal reduction and nitridation of aluminum borate powders

Takafumi Kusunose, Nobuaki Sakayanagi, Tohru Sekino, Yoichi Ando

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

In order to fabricate aluminum nitride/boron nitride (AlN/BN) nanocomposites by pressureless sintering, the present study investigated the synthesis of AlN-BN nanocomposite powders by carbothermal reduction and nitridation of aluminum borate powders. Homogeneous mixtures of alumina (Al 2O 3), boric acid (H 3BO 3), and carbon powder were used to synthesize AlN/BN nanocomposite powders containing 10 and 20 vol% BN. Aluminum borate was produced by reacting Al 2O 3 and B 2O 3 above 800°C, and AlN and turbostratic BN (t-BN) were produced by reacting aluminum borate with carbon powder and nitrogen gas at 1500°C. Carbothermal reduction followed by nitridation yielded an AlN/BN nanocomposite powder composed of nanosized AlN and t-BN. By pressureless sintering nanocomposite AlN/BN powders containing 5 wt% Y 2O 3, AlN/BN nanocomposites were obtained without compromising the high thermal conductivity and high hardness.

Original languageEnglish
Pages (from-to)5846-5853
Number of pages8
JournalJournal of Nanoscience and Nanotechnology
Volume8
Issue number11
DOIs
Publication statusPublished - 2008 Nov 1

Keywords

  • AlN
  • BN
  • Carbothermal reduction
  • Nanocomposite
  • Nitridation
  • Thermal conductivity

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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