Zg. Fang et Jw. Eason, NONDESTRUCTIVE EVALUATION OF WC-CO COMPOSITES USING MAGNETIC-PROPERTIES, International journal of powder metallurgy, 29(3), 1993, pp. 259-265
A new approach has been developed to evaluate the chemical composition
and microstructure of WC-Co composites utilizing density, specific ma
gnetic saturation of composites (sigma(sc)), and coercivity. A density
vs. specific magnetic saturation diagram is developed and described.
The diagram depicts the dependence of sigma(sc) and density on cobalt
and carbon content. This graphic representation and its associated equ
ations can be used to determine precisely the cobalt and carbon conten
t from measured density and sigma(sc). The dependence of magnetic coer
civity on cobalt and carbon content, and grain size was also evaluted.
The grain size of the WC-Co composites can be calculated from an empi
rical relation between coercivity and mean free path of the binder pha
se if the cobalt and carbon content are known. The calculated results
have been compared to experimental results measured using quantitative
metallographic methods.