Strength of diamond materials after heating under pressure

  • A. V. Nozhkina JSC Research Institute of Natural, Synthetic Diamonds and Instrument VNIIALMAZ
  • V. I. Buhakov Institute for High Pressure Physics Russian Academy of Sciences
  • A. I. Laptev National University of Science and Technology MIS&S
Keywords: diamond powders, strength, heat resistance, pressure

Abstract

The purpose of this work was to establish the effect of pressure on the heat resistance of various diamond materials. The analysis of the available data on the effect of pressing pressure during sintering on the thermal stability of both natural and artificial diamonds showed that the pressing pressure raises the temperature of softening and graphitization of all types of diamonds. The procedure for studying the effect of pressure on heat resistance was as follows: diamond powders from natural diamonds of grade A4, synthetic single crystal diamonds of SDB 1100, AC 125 and synthetic polycrystalline diamonds of grade ARK4 were heated in vacuum and at pressures of 2.5; 4.0 GPa to different temperatures. Determine the strength of diamond powders before heating and after heating. It was found that increasing the pressing pressure when the diamonds are heated leads to a slowdown in the processes of their graphitization and a significant increase in the thermal stability of diamonds that have inclusions of catalyst metals

Published
2018-07-23
Issue
Vol 21 (2018): Rock Destruction and Metal-Working Tools – Techniques and Technology of the Tool Production and Applications
Section
Instrumental, structural and functional materials based on diamond and cubic bor