IMPROVEMENT OF PHYSICOMECHANICAL CHARACTERISTICS OF SYNTHETIC DIAMONDS FOR THE RULING TOOL

  • Tatiana O. Prikhna V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Halyna D. Ilnytska V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Valerii I. Lavrinenko V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Olga B. Loginova V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Viktor V. Harashchenko V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Oleksandr M. Sokolov V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Iryna M. Zaitseva V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Volodymyr V. Smokvyna V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
  • Tamara O. Kosenchuk V.N. Bakul Institute for superhard materials of the National Academy of Sciences of Ukraine
Keywords: synthetic diamonds, a specific magnetic susceptibility, an ultimate load at static compression of grains, thermostability, uniformity on strength.

Abstract

The results of studies of the influence of heat treatment on the physicomechanical characteristics of 500/400 and 250/200 grit diamond grinding powders after their separation in a magnetic field of different strengths are presented. It is shown that for both grit sizes, separation in a magnetic field facilitates the production of diamond fractions that differ in the content of intracrystalline inclusions in them and the change in their physical and mechanical characteristics: strength, uniformity in strength, and heat resistance. In diamond powders with a higher content of intracrystalline inclusions, after heat treatment in an inert medium, a decrease in the strength of crystals is observed for both grit sizes both at a temperature of 800 °C and at 1100 °C. In diamond powders with a lower content of intracrystalline inclusions after processing at a temperature of 800 °C, due to a decrease in internal stresses, an insignificant (not more than 5 %) increase in strength occurs. The thermal stability of both grit sizes for all studied diamond fractions, decreases with an increase in the content of intracrystalline inclusions in them

Published
2020-09-25
Issue
Vol 23 No 1 (2020): Tooling materials science
Section
Instrumental, structural and functional materials based on diamond and cubic bor