Influence of cobalt portion on structure and properties of FGHM

The purpose of this paper was characterisation of the structure and properties of functionally gradient hardmetals manufactured by P/M method on the basis of cobalt matrix. The distribution of functionally gradient hardmetals porosity was made using image analysis on the light microscope. Hardness tests of all layers in the sintered test pieces were made with the Vickers method. Density of sintered samples was made using the Archimedes method. In case of the all cemented carbides reinforced with different ceramics particles fabricated, it was found that density of sintered samples depend on reinforced particles. Moreover, density of sintered samples depend on temperatures and atmosphere of sintering process. The investigation results will provide useful information in applying the Powder Metallurgy to manufacturing functionally gradient hardmetals on the basis of cobalt matrix. The project contributes to improving of tool cutting material properties through manufacturing of functionally gradient hardmetals by P/M method. [Received on 15 November 2006; Accepted on 12 February 2007]