Spark plasma sintering of Al2O3-cBN composites facilitated by Ni nanoparticle precipitation on cBN powder by rotary chemical vapor deposition

Jianfeng Zhang, Rong Tu, Takashi Goto

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Al2O3-cBN/Ni composites were consolidated by spark plasma sintering (SPS) using α-Al2O3 and Ni nanoparticle precipitated cBN (cBN/Ni) powders. The Ni nanoparticles, 10-100nm in diameter and 0.5-2.2mass% in content, were precipitated on cBN powder by rotary chemical vapor deposition. The effect of sintering temperature (TSPS) and Ni content (CNi) on the densification, phase transformation, microstructure and hardness of the Al2O3-cBN/Ni composites were investigated. The highest relative density of Al2O3-30vol% cBN composite was 99% at TSPS=1573K and CNi=1.7mass%. At TSPS=1673K, the relative density decreased due to the phase transformation of cBN to hBN. The Vickers hardness of Al2O3-30vol% cBN/Ni at TSPS=1573K and CNi=1.7mass% showed the highest value of 27GPa.

Original languageEnglish
Pages (from-to)2083-2087
Number of pages5
JournalJournal of the European Ceramic Society
Volume31
Issue number12
DOIs
Publication statusPublished - 2011 Oct 15

Keywords

  • C. Mechanical properties
  • Microstructure
  • Ni nanoparticle precipitated cBN (cBN/Ni)
  • Phase transformation
  • Spark plasma sintering (SPS)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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