Correlation of the Diamond/Matrix Interphase Zone Structure with Tool Efficiency Obtained by Technology Combining Metallization of Diamonds with Matrix Sintering

Resumo

The paper studies the structure and phase characteristics of the interphase zone diamond/matrix in dressers made by thermal diffusion metallization of a diamond combined with matrix sintering based on WC–Co and Cu impregnation. The compact arrangement of chromium powder particles around diamond grains and the shielding effect of copper foil create favorable conditions for thermal diffusion metallization of diamond at matrix sintering. A metallized coating chemically bonded to diamond and consisting of chromium carbide and solid solution of cobalt in chromium phases provides a strong diamond retention in the carbide matrix. It is shown that it is formed on the surface of the diamond under the conditions specified in the experiment and the temperature–time sintering mode. The specific productivity of experimental dresser made by hybrid technology at straightening the green silicon carbide grinding wheel equaled 51.50 cm³/mg, exceeding that of the control dresser made without metallization of diamonds by sintering with copper impregnation by 44.66%.