PECULIARITIES OF THE COMPOSITE STRUCTURE PRODUCED IN THE DIAMOND–TiNi3 SYSTEM DURING THE THERMOBARIC SINTERING PROCESS

  • A. S. Osipov V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • O. I. Bykov I.M. Frantsevich Institute for Problems in Materials Science of NAS of Ukraine
  • D. A. Stratiichuk V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • Yu. O. Melniichuk V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
  • І. А. Petrusha V. N. Bakul Institute for Superhard Materials of National Academy of Sciences of Ukraine
Keywords: diamond, titanium carbide, high pressure, composite, structure

Abstract

The composite samples were produced in the diamond–TiNi3 systems by the method of infiltration of the diamond micropowders by the intermetallic TiNi3 melt under the conditions of high pressure of 8.0 GPa and temperature of 1750 °C. Composite contains diamond, titanium carbide (TiC0.6) and nickel carbides (NiC, Ni3C). It was determined that the mass ratio between diamond and titanium carbide is equal to 98:2. As a result of structural transformations in the region of diamond particles contacts, strongly defective fragments of grain boundaries are observed. The microstructure of the composite is characterized by the presence of a diamond frame with a strong bond between the diamond grains.

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