The compaction of powder metallurgy bars using high voltage electrical discharges

Challenges and Opportunities for Spark Plasma Sintering: A Key Technology for a New Generation of Materials

“…In addition to continuous pulses, some researchers also investigated a single discharge method, i.e., the powders were densified by a single discharge generated from a capacitor bank. In the late 1970s, Clyens et al [Clyens et al, 1976], Raichenko et al [Raichenko et al, 1973] and Geguzin et al [Geguzin et al, 1975] studied the compaction of metal powders using electric discharge compaction (EDC) or electric discharge sintering (EDS). In all the methods cited, electrically conductive powders are heated by Joule heating generated by an electric current.…”

Surface characteristics of self-assembled microporous Ti-6Al-4V compacts fabricated by electro-discharge-sintering in air

“…When a capacitor bank is discharged through a powder column confined in a tube, a long cylindrical metal powder column conducting a current density tends to contract radially. At this moment the magnetic field generated by the current flow causes a diametric contraction, which is known as the pinch pressure effect [12,13]. The pinch pressure is maximized at the center of the powder column.…”

Effects of temperature on the mechanical properties of Ti6Al4V powder compacts prepared by magnetic pulse compaction

“…The scholars of Russia, the United States, Japan, South Korea, and other countries made a number of follow-up researches. Alp and AI-Hassani improved the density and uniformity of compact by electro-impact compaction in the late 1980s [1]. Pulse discharge pressure sintering or plasma activated sintering began to display wide application prospects in the preparation of functionally gradient materials and nanomaterials in the early 1990s.…”

“…Besides conventional static compaction technology, there are some novel compaction methods now, such as electrical discharge compaction, pulse discharge pressure sintering, and dynamic magnetic compaction (DMC, namely, magnetic pulse compaction). Clyens et al pressed strip, stick, and complex shape products using electrical discharge compaction; and they successfully made strip and stick products with taper angle by screening powder size [1][2]. Since then, in order to get high-density products, Williams tried to compact high-melting materials with low-meltingpoint metal [3].…”