1. Compacting
Tungsten powder is consolidated into a compact by two main routes: pressing in rigid dies (uniaxial pressing) an isostatic pressing in flexible molds (compaction under hydrostatic pressure). Other techniques, such as powder rolling, cold extrusion, explosive compaction, slip casting, vibratory compaction, or metal injection molding, have gained no industrial importance.
Tungsten powder is not easy to compact due to its relatively high hardness and difficult deformation. Nevertheless, in most cases compaction is performed without lubricant to avoid any contamination by the additive. The resulting compacts are generaIIy sufliciently strong so that they can be handled without breaking. For machining the part, it “must be pre-sintered beforehand.
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