High velocity compaction of ferrous powder

Effect of multiple impacts on high velocity pressed iron powder

“…One can clearly see that green densities of specimens increase gradually with increasing total impact energy. On the other hand, at the identical total impact energy green densities of compacts produced by double impact is higher than that of compacts pressed by single or triple impact, which is similar to the result of electrolytic copper powder [12], while that of parts prepared by triple impact is the lowest. As the total impact energy rises up, the difference of green densities between double and triple impact decreases gradually.…”

“…For the HYP35-7 High Velocity Compaction Machine, F is 76.087 kN and m is 135 kg. The geopotential energy of the hammer can be ignored [12]. A load-cell, with the sampling rate of 100 kHz, was located on the lower surface of the lower punch to obtain very sharp and short peaks.…”

Effect Of Ti Powder Addition On The Fabrication Of TiO2 Nanopowders

“…Densification at this stage is thought to be nearly complete, as further increase in pressure can permanently crush or flatten the contact zones of the particles. At maximum compaction pressure, extreme resistance against further densification is observed, specifically due to strain hardening of materials [8][9][10]. One of the areas where this dynamic compaction can effectively contribute is through making the compaction process faster.…”

Development of the Dynamic Compaction Resistance Sintering (DCRS): A new process for powder consolidation combining electric current and dynamic loading

“…Additionally, while using a HighVelocity Compaction (HVC) device, Eriksson et al (2003) observed a cumulative effect of the energy of impact on the green density when performing several impacts. Thus, HVC has been used to form ceramic compacts (Souriou et al, 2009) as well as Titanium (Yan et al, 2011) and Ferrous (Wang et al, 2009) green-bodies having better homogeneity than their counterparts obtained by conventional uniaxial pressing. While the HVC technique has also been used recently to sinter, by self heating and local melting, semi-crystalline polymer powders (Jauffrès et al, 2009), it is only recently that Tang et al (2010) used gravitational potential energy to perform one strike of HVC in a forging mold heated by coils and, thus, obtain samples having a higher density.…”