RT Journal Article
T1 Low-Voltage Capacitor Electrical Discharge Consolidation of Iron Powder
A1 Aranda Louvier, Rosa María
A1 Ternero Fernández, Fátima
A1 Aranda Louvier, Beatriz
A1 Montes Martos, Juan Manuel
A1 Gómez Cuevas, Francisco de Paula
AB Commercially pure iron powder has been processed by the capacitor electrical dischargeconsolidation technique. This consolidation technique applies an external pressure and, at the sametime, heats a metallic powder mass by the Joule effect of a high-voltage and high-intensity electriccurrent. In this work, a capacitor charged at low voltage has been used instead. The effect ofthe initial porosity of the Fe powder mass, i.e., of the precompaction pressure, and the number ofdischarges from the capacitor have been studied. The densification and remaining porosity, thesintering level, the Vickers microhardness, and the electrical resistivity of the sintered compacts havebeen studied. Compacts sintered by the conventional powder metallurgy route of cold pressingand furnace sintering were also prepared for comparison. Results show that a high initial porosityprovides a high electrical resistance in the powder column, a necessary requisite for the Jouleeffect to increase densification with the number of discharges. Thus, the final porosity decreases to0.22 after 50 discharges in the powder mass with an initial porosity of 0.30. With this initial porosity,the sintering process increases Vickers microhardness from 29 to 51 HV10 and decreases the electricalresistivity of the powder mass from 3.53 × 10−2to 5.38 × 10−4 Ω·m. An initial porosity of 0.2 does notmake the compacts densify, but a certain bond between particles is attained, increasing microhardnessand decreasing electrical resistivity as the number of discharges increases. Lower initial porositiesmake the powder mass behave as an electrical conductor with no appreciable changes even after50 electrical discharges
PB MDPI
SN 2075-4701 (electrónico)
YR 2022
FD 2022-08
LK http://hdl.handle.net/10272/21182
UL http://hdl.handle.net/10272/21182
LA eng
NO Aranda, R.M.; Ternero, F.; Aranda, B.; Montes, J.M.; Cuevas, F.G. Low-Voltage Capacitor Electrical Discharge Consolidation of Iron Powder. Metals 2022, 12, 1461. https://doi.org/10.3390/ met12091461
NO This research was funded by Junta de Andalucía, grant to the Research Group TEP-971 andthe University of Seville Research Funding Program, grant number 2020/00000647
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026