Densification of SiO 2-cBN composites by using Ni nanoparticle and SiO 2 nanolayer coated cBN powder

Jianfeng Zhang, Rong Tu, Takashi Goto

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Cubic boron nitride (cBN) powder was coated with Ni nanoparticle and SiO 2 nanolayer (abbreviated as cBN/Ni and cBN/SiO 2, respectively) by rotary chemical vapor deposition (RCVD), and compacted with SiO 2 powder by spark plasma sintering at 1473-1973 K for 0.6 ks. The effects of Ni and SiO 2 coatings on the densification, phase transformation of cBN and hardness of SiO 2-cBN composites were compared. The phase transformation of cBN to hBN was identified at 1973 K in SiO 2-cBN/SiO 2 composites, 300 K higher than that in SiO 2-cBN/Ni composites, indicating that SiO 2 retarded the transformation of cBN. The relative density of SiO 2-cBN/SiO 2 with 50 vol% cBN sintered at 1873 K was 99% with a hardness of 14.5 GPa.

Original languageEnglish
Pages (from-to)4961-4966
Number of pages6
JournalCeramics International
Volume38
Issue number6
DOIs
Publication statusPublished - 2012 Aug 1

Keywords

  • Cubic boron nitride (cBN)
  • Ni nanoparticle
  • Rotary CVD (RCVD)
  • SiO nanolayer
  • Spark plasma sintering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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