Assessing critical binder volume concentration using uniaxial die pressing: An alternative approach

This study presents a methodology for determining powder systems' Critical Binder Volume Concentration (𝐶𝐵𝑉𝐶), a key parameter in optimizing paste properties for various shaping processes. Leveraging both press and pycnometer density measurements, our approach precisely identifies the 𝐶𝐵𝑉𝐶 by analysing the pressure-dependency of powder compaction within a confined cavity, reflecting the interplay between internal friction and packing capacity. Through comparative analysis with established techniques, we validate our method using a nano-sized WC-Co powder system combined with two distinct organic binders, linseed oil and a proprietary binder. The method finds the maximum packing fraction more efficiently and utilizes less material than conventional 𝐶𝐵𝑉𝐶 determination techniques. A zero-pressure density is introduced and its applicability to other powder types, including ceramics and metals, is anticipated.