analytical evaluation of high-power ultrasonic-assisted cold compaction of titanium powder

Researchers have considered powder compaction modeling to predict the necessary compaction pressure at a desirable density. this paper presents cold compaction modeling of titanium powder under high-power longitudinal ultrasonic vibration based on experimental tests. superimposing high-frequency, high-power mechanical vibration on the compaction process could improve green density and density distribution. for this purpose, a special ultrasonic-assisted cold compaction setup was designed and fabricated. cp titanium powder with a size of < 45 µm was compacted (up to 900 mpa) at different ultrasonic powers (0, 100 w, 150 w, 200 w, 300 w). then, a mathematical formulation was presented for ultrasonic-assisted cold powder compaction consisting of four terms: initial density, particle rearrangement, particle deformation, and ultrasonic vibration effects. the results showed that the presented mathematical model could accurately predict green compact density as a function of compaction pressure and ultrasonic power.