Wear resistance of nano-polycrystalline diamond with various hexagonal diamond contents

A. Kurio, Y. Tanaka, H. Sumiya, T. Irifune, T. Shinmei, H. Ohfuji, H. Kagi

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Wear resistance of nano-polycrystalline diamond (NPD) rods containing various amounts of hexagonal diamond has been tested with a new method for practical evaluation of the wear-resistance rate of superhard ceramics, in addition to the measurements of their Knoop hardness. The wear resistance of NPD has been found to increase with increasing synthesis temperature and accordingly decreasing proportion of hexagonal diamond. A slight increase in Knoop hardness with the synthesis temperature also has been observed for these samples, consistent with the results of the wear-resistance measurements. These results suggest that the presence of hexagonal diamond would not yield any observable increase in both hardness and wear resistance of NPD, contradictory to a recent prediction suggesting that hexagonal diamond is harder than cubic diamond. It is also demonstrated that NPD is superior to single crystal diamond in terms of relatively homogeneous wearing without any significant chipping/cracking.

Original languageEnglish
Pages (from-to)343-349
Number of pages7
JournalJournal of Superhard Materials
Volume34
Issue number6
DOIs
Publication statusPublished - 2012 Nov
Externally publishedYes

Keywords

  • hardness and wear resistance of NPD
  • hexagonal diamond
  • nano-polycrystalline diamond (NPD)

ASJC Scopus subject areas

  • Materials Science(all)
  • Inorganic Chemistry

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