A porous materials production with an electric discharge sintering

Capacitor Electrical Discharge Consolidation of Metallic Powders—A Review

“…In the centre of Figure 1b the necks eventually grow to sinter the powder aggregate showing a dense core because of the effect of the pinch pressure [41]. A review of several porous materials, including Ti, Nb and Ta, prepared by EDC can be found in [42]. The effect of the applied pressure can be checked by comparing the energy necessary to consolidate Ti powders [43].…”

“…Regarding Ti-base materials, EDC processing of pure Ti was studied in India [26], Italy [44], and specifically for medical implants, in Korea [37,41,48,55,109] and Belarus [42]. This later research group has also studied the Ti-6Al-4V alloy, initially in the US [39,72,107] and more extensively in Korea [38,45,61,[110][111][112][113][114].…”

“…Regarding radial shrinkage, under low pressures of about 10 MPa, the pinch effect is dominating, producing a radial contraction of 5-9%, and higher for smaller particles. For pressures of 10-20 MPa, the contraction is reduced to 1-1.5% [42]. Despite the short discharge time, TiO2 surfaces transform to other titanium oxides during EDC, even during environmental discharges in a vacuum [55] or Ar atmosphere [37,41].…”

Cylindrical Distribution of Electric Discharge in a Fluid.

“…Impulse energy technology is widely used in various fields of production and processing of useful materials. The brief review presented in [1] showed the advantage of the high-voltage discharge current method in production of porous materials from titanium, niobium and tantalum powders. The recycling of useful materials, such as metals and plastics, is rated as an important process in terms of conserving resources and protecting the environment.…”

Preparation and properties of porous SiC–Al2O3 ceramics using coal ash

“…Porous ceramic with their various advantages, such as better thermal and chemical stabilities, good slag corrosion resistance, and thermal shock resistance, as well as high surface area have been attracting much attention in the fields of catalyst carriers, filters for molten metals, removal from the exhaust gases of diesel engines, electrodes in fuel cells, sound‐absorbing materials, etc . Nowadays, various processing techniques have been developed to prepare porous ceramic, includes organic foam impregnation, pore‐forming agent, gel‐casting, direct foaming, molten salt, chemical vapor deposition, three‐dimensional printing (3DP), freeze casting, etc.…”