Al2O3-cBN composites sintered by SPS and HPHT methods

P. Klimczyk*, M. E. Cura, A. M. Vlaicu, I. Mercioniu, P. Wyzga, L. Jaworska, S. P. Hannula

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

33 Citations (Scopus)

Abstract

Spark Plasma Sintering (SPS) and High Pressure-High Temperature (HPHT) methods were chosen in order to study the behaviour of metastable cubic boron nitride (cBN) during sintering of Al2O3 +30vol.% cBN composites at low and high pressure. Relatively low sintering temperatures were used to avoid the undesired reverse transformation of cBN to hexagonal, graphite-like form. The microstructure, and phase composition as well as physical and mechanical properties of the resulting Al2O3-cBN composites were investigated. In the ball-on-disc tests, the coefficient of friction and the specific wear rate of the sintered samples were determined by rotating the sample against a stationary alumina ball. The best composites obtained by SPS (at 1300°C/75MPa) had slightly lower density, Young's modulus and hardness than those obtained by HPHT but their wear resistance was much better. Formation of hBN was suppressed up to 1300°C during SPS consolidation at the pressure of 75MPa.

Original languageEnglish
Pages (from-to)1783-1789
JournalJournal of the European Ceramic Society
Volume36
Issue number7
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Alumina
  • Cubic boron nitride (cBN)
  • High Pressure-High Temperature (HPHT)
  • Mechanical properties
  • Spark Plasma Sintering (SPS)

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