Critical assessment 28: Electrical field/current application – a revolution in materials processing/sintering?

Anselmi‐Tamburini, Umberto; Groza, Joanna R.

doi:10.1080/02670836.2017.1341692

Cited by 40 publications

(20 citation statements)

References 69 publications

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“…The interactions between applied currents and powders could induce a number of physical phenomena, including electromigration, electroplasticity, grain boundary interactions, and the Peltier effect . In theory, the polarity reversal of AC currents leads to reduced electromigration, supporting the claim that AC currents inhibit grain growth better than DC waveforms .…”

Section: Discussionmentioning

confidence: 95%

Comparison of AC to DC current sources for field‐assisted sintering of aluminum alloy 5083 powder

Kellogg

Kornecki

Raju³

et al. 2018

J Am Ceram Soc

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The viability of resistively sintering aluminum 5083 powder with an alternating current (AC) was explored under both as-atomized and cryomilled conditions. Samples were processed under an AC field and a direct current (DC) field. Samples processed by both methods exhibited similar microstructures and densities at different die wall temperatures. For as-atomized powders, similar densities (99% of theoretical [TD]) were achieved at die wall temperatures of 564°C under DC fields and 525°C under AC fields. For cryomilled 5083, densities up to 90% of theoretical were achieved at 550°C under DC fields, while density values 99% of TD were achieved at 500°C under AC fields. Based on these findings, it has been determined that AC fields can be used as an alternative to SPS for achieving optimal density. K E Y W O R D Scryomilling, electrical conductivity, electrical properties, energy coupled to matter, field-assisted sintering technology, spark plasma sintering

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Section: Discussionmentioning

confidence: 95%

Comparison of AC to DC current sources for field‐assisted sintering of aluminum alloy 5083 powder

Kellogg

Kornecki

Raju³

et al. 2018

J Am Ceram Soc

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“…The interest of using electric current [28] in SPS lies in that an intense electric current is allowed to flow directly through the sample. Further threshold for pressure is also another aspect that is interdependent on the type of mold which is used.…”

Section: Influence Of Direct Electric Current Pulse On Sintering In Cmentioning

confidence: 99%

Ultrahigh pressure SPS (HP-SPS) as new syntheses and exploration tool in materials science

Prakasam

Balima

Cygan

et al. 2019

Spark Plasma Sintering

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Ultrahigh pressure SPS processing is demonstrated with high pressure (HP) Belt and high pressure Bridgman apparatus. These HP apparatuses are capable of working in temperature range 20°C-1800°C and the pressure ranges of 800 MPa-6 GPa (HP-SPS-Belt) and 4-6 GPa (HP-SPS-Bridgman) coupled respectively with pulse electric direct current. The designed equipment can be employed for various applications in materials processing to fine tune materials properties through microstructure engineering by employing high pressure and pulse electric current. We have demonstrated the benefits of HP-SPS-Belt and HP-SPS-Bridgman in comparison to conventional SPS to obtain dense sintered compact with β-SiC as a demonstrative material at comparatively low temperatures (1300°C), duration (3 minutes) and pressure (4 GPa). The initial nanosized grains are retained in the sintered compact. The developed innovation has huge potentials for various applications for materials processing, consolidation and assembling in Materials Science.

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“…The medium-frequency electrical resistance sintering (MF-ERS) equipment used in this work brings an additional advantage: The medium-frequency technology allows the use of a direct current and the decrease of the weight and size of the welding transformer core, at the time that maintains its power. The main disadvantages of the ERS technique arise from operational difficulties (incomplete knowledge of how certain parameters influence the process) and the problem of achieving a homogeneous temperature distribution in the powder mass [18]. Some of the authors of this paper have studied this process, both from the experimental and theoretical points of view [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Parameters on the Conduct of Electrical Resistance Sintering of Iron Powders

Fernández

Astacio

Caballero

et al. 2020

Metals

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The influence of the applied pressure and electrical parameters on the macrostructure of specimens consolidated by the medium-frequency electrical resistance sintering technique (MF-ERS) is analysed in this work. This technique is based on the application of pressure to a mass of conductive powder that, simultaneously, is being crossed by a high intensity and low voltage electric current. The simultaneous action of the pressure and the heat released by the Joule effect causes the densification and consolidation of the powder mass in a very short time. The effect of the current intensity and heating time on the global porosity, the porosity distribution, and the microhardness of sintered compacts is studied for two applied pressures (100 and 150 MPa). For the different experiments of electrical consolidation, a commercially available pure iron powder was chosen. For comparison purposes, the properties of the compacts consolidated by MF-ERS are compared with the results obtained by the conventional powder metallurgy route (cold pressing and furnace sintering). Results show that, as expected, higher current intensities and dwelling times, as well as higher pressures and the consolidation of compacts with lower aspects ratios, produce denser materials.

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Critical assessment 28: Electrical field/current application – a revolution in materials processing/sintering?

Cited by 40 publications

References 69 publications

Comparison of AC to DC current sources for field‐assisted sintering of aluminum alloy 5083 powder

Comparison of AC to DC current sources for field‐assisted sintering of aluminum alloy 5083 powder

Ultrahigh pressure SPS (HP-SPS) as new syntheses and exploration tool in materials science

Influence of Processing Parameters on the Conduct of Electrical Resistance Sintering of Iron Powders

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