OPTIMIZATION OF AMBIENT TEMPERATURE AROUND SIX-PUNCH HIGH-VOLUME APPARATUS TO COMPRESSION CELL FOR DIAMOND SINGLE CRYSTALS CRYSTALLIZATION

  • A. V. Burchenia V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • V. V. Lysakovskyi V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • S. O. Ivakhnenko V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • T. V. Kovalenko V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • S. O. Gordeiev V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
Keywords: diamond single crystal, six-punch press, temperature gradient

Abstract

The influence of changes in ambient temperature around six-punch press on the formation of growth condition for growing structurally perfect diamond single crystals by temperature gradient method is studied in this work. Computer simulation of finite element method was used to obtain pictures of temperature distribution inside of growth volume. The formation of temperature distribution and its gradients depending on growth conditions at pressure 6–6.5 GPa and temperature 1300–1600 ℃ and their dependence on heating–cooling of air surrounding large press components was studied. It was shown that the temperature in the growth container can vary within ± 50 ℃.

Obtained data allowed us to conclude that it is necessary to stabilize air temperature around press at the level of 21 ± 1 ℃, which allows to improve quality of the grown diamond single crystals.

Published
2022-02-11
Issue
Vol 24 No 1 (2021): Instrumental Materials Science
Section
Instrumental, structural and functional materials based on diamond and cubic bor