Mechanical Properties of WC-Co Alloys with Various Mixing and Milling Conditions using High Energy Ball Miller
Rumman Md. Raihanuzzaman,
This study aims to understand the changes in mechanical properties when WC-7.5wt%Co and WC-12wt%Co compositions
were experimented with various mixing, milling and consolidation conditions. Magnetic Pulsed Compaction (MPC) was used to consolidate
WC-7.5wt% Co and WC-12wt% Co powders where high-energy ball milling with varying duration was employed for generating
various powder types. Mechanically alloyed milled, non milled and mixed (non milled and milled powders in certain proportions) powders
with compositions of WC-7.5wt% Co and WC-12wt% Co were used, followed by applying high pressures to form the bulks. Maximum
densities for mixed milled and non milled WC-Co bulks after MPC were found to be around 60-65%, which later turned nearly
82% after sintering, while a maximum hardness of over 1400 Hv was observed in WC-12wt%Co sample. Density, hardness and other
microstructural behavior did not illustrate substantial changes when mixed powders were used, although variations were noticed when
non-milled powders were used for consolidation.
Keywords: Carbides, compaction, high-energy ball milling, mechanical properties, microstructure, sintering.
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