Effect of mechanical activation of WC-based powder on the properties of sintered alloys

OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 23 No. 1 2021 Fig. 8. Porosity of sintered samples depending on the milling time of powder Conclusion Studies have shown that mechanical activation of the powder leads to a decrease in the size of particles and agglomerates: as a result of the powder mechanical activation for 300 seconds, the size of aggregates decreased from 350 ± 45 to 15 ± 5 μ m, and the average size of small particles decreased from 7 to 1.4 μ m. It was found that when machining for more than 100 seconds, in addition to the crystalline WC- and W 2 C-phases, an X-ray phase is formed, whose relative content does not exceed 15 ±5%. The crystal lattice parameter of the WC-phase during processing does not change and corresponds to the literature data. It is shown that the width of all peaks increases signi fi cantly after 10 s of machining, and when treated for 300 s, the size of the WC phase CDD decreases from 47 ± 5 nm to 27 ± 5 nm and the microdistortion increases from 1.1 ± 0.03 · 10 –3 to 5.5 ± 0.03 · 10 –3 . Fig. 9. Hardness of sintered samples depending on the milling time of powder