DIAMOND НTНР-CRYSTALLIZATION USING METALLIC CARBON SOLVENTS OBTAINED BY POWDER METALLURGY

  • V. V. Lysakovskyi V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • S. O. Gordeev 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
  • O. O. Zanevskyy V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • O. V. Savitskyi V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
Keywords: : solvent alloys, powder metallurgy, diamond single crystals, high pressure

Abstract

The paper explores the possibility of compacting the blanks of the initial of solvent alloys samples using the principles of powder metallurgy to obtain cylindrical blanks with  diameter of more than 30 and  height of  more than 16 mm. The use of pre-molding of blanks from a mixture of Fe and Co powders, which in the initial state have certain ratios of the components and the values ​​of grain size and the subsequent thermobaric sintering at 4-4.5 GPa and a temperature of 0.8 from the melting point of the alloy at atmospheric pressure allowed get source blanks with porosity less than 2 %.

Tests of solvent alloys obtained by powder metallurgy showed their high efficiency for growing structurally perfect diamond single-crystals of type Ib and weighing up to 2 carats, as well as the prospect of use for industrial diamond production.

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