Preparation of Al2O3-cBN functionally graded material by spark plasma sintering

Mikinori Hotta, Takashi Goto

Research output: Contribution to journalArticlepeer-review


Al2O3-cBN functionally graded material (FGM) was synthesized by spark plasma sintering (SPS) using powder compact with graded compositions containing 0 to 20 vol% cBN under a uniaxial pressure of 100 MPa. Densification, phase transformation of cBN, microstructure, hardness and fracture toughness of the FGM were investigated. Al2O3-cBN FGM with relative density of more than 99% was prepared at 1300 °C for 600s. No obvious interface between Al2O3 and cBN layers was observed, and cBN particles were uniformly dispersed in an Al 2O3 matrix. Vickers hardness and fracture toughness continuously increased with cBN content, and reached to 28 GPa and 5 MPa · m1/2 respectively at the surface layer.

Original languageEnglish
Pages (from-to)373-377
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number5
Publication statusPublished - 2008 May


  • Alumina
  • Cubic boron nitride
  • Cutting tool
  • Functionally graded material
  • Spark plasma sintering

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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