Article ID Journal Published Year Pages File Type
1603978 International Journal of Refractory Metals and Hard Materials 2009 12 Pages PDF
Abstract
The effects of ball milling time on the synthesis and consolidation of WC-10 wt%Co powder were investigated by high energy milling in a horizontal ball mill. Nanostructured powder was mechanically alloyed after 60 min cyclic milling with a WC average domain size of 21 nm. The number of nanosize (<0.2 μm) particles increased with milling time. Contamination by Fe increased with milling time, reaching almost 3 wt% after 300 min milling. The onset of the WC-Co eutectic was lowered to 1312 °C through an increase in milling time. The density of the compacted powders increased with the compaction pressure but decreased with milling time achieving 61.7% after 300 min milling compared to 64.4% for 30 min. The compressibility behaviour of the milled powders was determined using a compaction equation. Densification and hardness reached optimum levels for the 60 min milled powder after both pressureless sintering and sinter-HIP.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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