Preparation of SiAlON-cBN composites using Ni nanoparticle precipitated cBN powders

Jianfeng Zhang, Rong Tu, Takashi Goto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

SiAlON was mixed with Ni nanoparticle precipitated cBN (SiAlON-cBN/Ni) and sintered by spark plasma sintering at 1923 K for a holding time (tH) of 0 to 1.8 ks. The effect of Ni nanoparticle and holding time on the phase transformation of cBN to hexagonal (hBN), densification, microstructure and hardness of the SiAlON-cBN composites was studied. At tH =1.8 ks, the relative density of the SiAlON-20 vol% cBN/Ni was 99%, 7% higher than that of SiAlON-20 vol% cBN, indicating that Ni nanoparticle on cBN promoted the densification of SiAlON-cBN composites. The BN grains in SiAlON-20 vol% cBN showed a round morphology, whereas the BN grains in SiAlON-20 vol% cBN/Ni composite showed a flake morphology characteristic of hBN. The phase transformation of cBN was accelerated by Ni. The maximum hardness of SiAlON-20 vol% cBN/Ni was 16.3 GPa obtained at tH = 0 ks.

Original languageEnglish
Title of host publicationMaterials Integration
PublisherTrans Tech Publications Ltd
Pages17-20
Number of pages4
ISBN (Print)9783037853764
DOIs
Publication statusPublished - 2012
EventInt. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011 - Sendai, Japan
Duration: 2011 Dec 12011 Dec 2

Publication series

NameKey Engineering Materials
Volume508
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Other

OtherInt. Symposium of GCOE: Materials Integration, in Conjunction with the 2nd Int. Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2011 and the 8th Materials Science School for Young Scientists, KINKEN-WAKATE 2011
CountryJapan
CitySendai
Period11/12/111/12/2

Keywords

  • CBN
  • Holding time
  • Ni nanoparticle
  • SiAlON
  • Spark plasma sintering

ASJC Scopus subject areas

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

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