Ball milling efficiency of heptahedron ball milling medium and its effects on alloy structure property

This paper compares the different ball milling efficiencies and methods by using different milling mediums (Self-designed Heptahedron Milling and Ball-milling) during WC-10 %Co's wet grinding preparation process. The analysis of sintered alloy properties shows the effect of different ball milling mediums on alloy properties. The results indicate that: The efficiency of Heptahedron Milling Medium is higher than Ball-milling by bringing more powder activity and oxygen-adding tendency during the mixture storage process. It therefore causes relatively lower cobalt and magnetism contents. Adding 0.2 % paraffin can prevent powder oxidation. Heptahedron milling medium is suitable for the mixture preparation with raw materials' Fisher particle size larger than 5.0 μ m, while ball milling medium is suitable for raw materials' Fisher particle size 0.8~5.0 μ m.