Finite-element modeling of the electro-thermal contacts in the spark plasma sintering process

Manière, Charles; Pavia, Anthony; Durand, Lise; Chevallier, Geoffroy; Afanga, Khalid; Estournès, Claude

doi:10.1016/j.jeurceramsoc.2015.10.033

Cited by 60 publications

(50 citation statements)

References 16 publications

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“…Indeed, the electrical current should get round the alumina sample by crossing the two interfaces punch/die. In a previous paper [15], we show the current density is locally very high in the area near the punch outlet and induces at this place a strong heat generation by Joule effect. We also showed that a non-negligible quantity of this heat is maintained in the papyex thickness because of the presence of high TCR papyex/punch and TCR papyex/die and this heat can diffuse along the papyex to the sample.…”

Section: Spacer/punch Punch/sample Sample/die and Punch/die Calibramentioning

confidence: 59%

“…We used, in this study, the calibration methodology employed in our two previous papers [15,16]. This methodology is a trial-and-error approach involving minimization of the experimental/simulated temperature field by the ECR and TCR calibration.…”

Section: The Calibration Methodsologymentioning

confidence: 99%

“…R th, stack = R th, graphite + R th, alu min a + 2TCR papyex/graphite + 2TCR papyex/alu min a (15) The global thermal contact resistance of the interface, between alumina and graphite TCR alumina-papyex-graphite integrating the papyex foil resistance, can be calculated from Eq. (16) derived from relation (15).…”

Section: Tcr (Graphite-papyex-graphite)mentioning

confidence: 99%

“…The punch/die ECR and TCR are modelled with the approach described in a previous paper [15]. The punch/die ECR is globally modelled here by a resistive layer with an anisotropic effective electrical resistivity e ( ex , ey ) of thickness 0.2 mm, corresponding to the initial punch/die gap where the papyex is introduced, which is assumed constant (19).…”

Section: Spacer/punch Punch/sample Sample/die and Punch/die Calibramentioning

confidence: 99%

“…All of these parameters imply a very low contact pressure and are difficult to determine. For this reason, some authors chose to access the ECR and TCR by calibration of the temperature field [10,11,15,16] The contact pressure Pa [13,17]. These two in situ approaches have the advantage of quickly allowing the establishment of a heating model very close to experiment.…”

Section: Introductionmentioning

confidence: 99%

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Contact resistances in spark plasma sintering: From in-situ and ex-situ determinations to an extended model for the scale up of the process

Manière

Durand

Brisson

et al. 2017

Journal of the European Ceramic Society

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, et al.. Contact resistances in spark plasma sintering: From in-situ and ex-situ determinations to an extended model for the scale up of the process. Journal of the European Ceramic Society, Elsevier, 2017, vol. 37 (n°4) b s t r a c tHeating in spark plasma sintering is a key point of this manufacturing process that requires advanced simulation to predict the thermal gradients present during the process and adjust them. Electric and thermal contact resistances have a prominent role in these gradients. Their determination is difficult as they vary with pressure and temperature. A calibration method is used to determine all of the contact resistances present within tools of different sizes. Ex situ measurements were also performed to validate the results of the in-situ calibrations. An extended predictive and scalable contacts model was developed and reveals the great importance and diversity of the contact resistances responsible for the general heating of the column and high thermal gradients between the parts. The ex/in situ comparison highlights a high lateral thermal contact resistance and the presence of a possible phenomenon of electric current facilitation across the lateral interface for the high temperatures.

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Section: Spacer/punch Punch/sample Sample/die and Punch/die Calibramentioning

confidence: 59%

Section: The Calibration Methodsologymentioning

confidence: 99%

Section: Tcr (Graphite-papyex-graphite)mentioning

confidence: 99%

Section: Spacer/punch Punch/sample Sample/die and Punch/die Calibramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Contact resistances in spark plasma sintering: From in-situ and ex-situ determinations to an extended model for the scale up of the process

Manière

Durand

Brisson

et al. 2017

Journal of the European Ceramic Society

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Identification of the Norton‐Green Compaction Model for the Prediction of the Ti–6Al–4V Densification During the Spark Plasma Sintering Process

et al. 2016

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One of the main challenges for the industrialization of the spark plasma sintering (SPS) is to resolve issues linked to the compaction of real parts with complex shapes. The modeling of powder compaction is an interesting tool to predict how the densification field varies during sintering. However, expressing the behavior law which reflect the powder compaction is often a difficult and long step in the model establishment. In this paper, a simple methodology for the identification of the densification parameters is proposed. Dense and porous creep tests combined with SPS die compaction tests are employed to determine a complete densification law on a Ti-6Al-4V alloy directly in a SPS machine. The compaction model obtained is successfully validated through prediction of the densification of new SPSed samples.

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A Rapid Thermal‐Radiation‐Assisted Sintering Strategy for Nd–Fe–B‐Type Magnets

Tomše,

Ivekovič,

Kocjan

et al. 2024

Adv Eng Mater

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The green transition has spiked demand for high‐performance sintered Nd–Fe–B permanent magnets, necessitating advanced powder consolidation technologies to enhance production efficiency. This study explores the rapid sintering methodology for an Nd–Fe–B powder using a radiation‐assisted sintering approach. The case study material is an industrially used powder, prepared through strip‐casting, hydrogen decrepitation, and jet milling, with a mean particle size of 5.5 μm. The powder is sintered to full density in a modified spark plasma sintering furnace, achieving pressureless conditions and eliminating electrical currents in the sample to preserve grain alignment and prevent decomposition of the hard‐magnetic phase. Fully dense samples are obtained with heating rates ranging from 10 to 200 °C min−1 and up to 5 min of dwell time at 1100 °C. Rapid heating results in grain size and microstructure comparable to conventionally sintered magnets prepared from the same powder, without compromising magnetic performance after postsinter annealing at 520 °C for 120 min. This sintering method contributes to a novel strategy for optimizing magnet production by utilizing efficient thermal‐radiation heat transfer. The combination of rapid heating and pressureless sintering drastically reduces heat‐up and dwell times, providing a fundamental advantage over slow conventional sintering.

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Finite-element modeling of the electro-thermal contacts in the spark plasma sintering process

Cited by 60 publications

References 16 publications

Contact resistances in spark plasma sintering: From in-situ and ex-situ determinations to an extended model for the scale up of the process

Contact resistances in spark plasma sintering: From in-situ and ex-situ determinations to an extended model for the scale up of the process

Identification of the Norton‐Green Compaction Model for the Prediction of the Ti–6Al–4V Densification During the Spark Plasma Sintering Process

A Rapid Thermal‐Radiation‐Assisted Sintering Strategy for Nd–Fe–B‐Type Magnets

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