Keyword: «matrix»

The structure and composition of the diamond-matrix interface of a composite diamond-containing material obtained by combining processes of the diamond grains metallization (chromium and iron) and the tungsten-cobalt matrix sintering impregnated with copper have been studied by Raman spectroscopy. It was founded that when diamond is metallized with chromium, there are no graphite-containing formations at the diamond-matrix interface. When diamond is metallized with iron at the interface, graphite is formed as separate isolated areas 1–15 µm in size.

A complex of methods was used to study the microstructure, elemental and phase composition of a diamond-containing hard-alloy matrix obtained by impregnation of the Fe-C eutectic melt in vacuum. It was found that the matrix consists of phases of tungsten carbide with a relative content of 61.0%, iron carbide – 17.0%, α-Fe – 16.5%, and graphite – 5.5%. The Fe-C eutectic alloy, which acts as a binding component of the matrix, consists of a ferrite-pearlite metal base with graphite inclusions. The microhardness of the matrix based on tungsten carbide impregnated with Fe-C melt is ~11 GPa, which is more than 3 times higher than the microhardness of the tungsten-cobalt matrix obtained by sintering with copper impregnation