Pulse analysis and electric contact measurements in spark plasma sintering

Manière, Charles; Pavia, Anthony; Durand, Lise; Chevallier, Geoffroy; Bley, Vincent; Afanga, Khalid; Peigney, Alain; Estournès, Claude

doi:10.1016/j.epsr.2015.06.009

Cited by 44 publications

(28 citation statements)

References 12 publications

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“…[3][4][5][6] They point out the concentration of heat in the punches and the important effect of electric and thermal contacts [7][8][9][10][11][12] on the temperature field. Concerning the electro-thermal part (heating), many authors consider the pure resistive model to be a good approximation of the heating phenomena.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…The stack is placed between the two copper punches. Then the total thermal resistance of the stack is given by (13).…”

Section: Tcr (Graphite-papyex-graphite)mentioning

confidence: 99%

“…These ECR and TCR result from non-ideal interfaces between the different parts with a certain roughness or from the presence of another material. Several authors have pointed out the importance and diversity of these contacts [10][11][12][13]. Anselmi-Tamburini et al [14] suggested the punch/sample ECR is negligible for high pressure but pointed out the importance of the punch/die contact resistance.…”

Section: Introductionmentioning

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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“…The main difficulty of the multiple parts configurations is the temperature homogeneity. Finite Element Method (FEM) simulations of the Joule heating [12][13][14][15][16][17][18][19][20][21][22] and the densification [23][24][25][26][27][28][29][30] are performed by many authors, with the aim of predicting the temperature and densification field and find optimized solutions [10,[31][32][33][34][35][36]. In previous work [11], we showed that a homogenization of the temperature field can be attained for multiple parts configurations by adjusting the electric current flow with electric insulations and specific geometrical tricks.…”

Section: Introductionmentioning

confidence: 99%

Spark plasma sintering and complex shapes: The deformed interfaces approach

Manière¹,

Nigito²,

Durand³

et al. 2017

Powder Technology

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tOver the last few decades, the SPS technique has proven its benefits in terms of microstructure control, reduction of cycling time and a general stability of the results. However, to overcome the so-called "valley of death" between fundamental research and successful industrialization, the next step is to prove the ability of this technology to perform the total densification of highly complex shape samples. The elaboration of complex shapes with die compaction processes often present densification inhomogeneity because of the thickness differences of the sample. In this paper, we present a method to solve this problem with an approach we called the "deformed interfaces method" that uses sacrificial materials. This method can be generalized to all the pressure assisted sintering techniques and allow a complete densification whatever the shape complexity of the part. This method is tested with different materials (Al, CoNiCrAlY, PMMA, Al 2 O 3 , 4Y-ZrO 2 ) and shapes. To prove the effectiveness of this method on very high complex shapes, a 98% dense turbine blade shape has been made.

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Pulse analysis and electric contact measurements in spark plasma sintering

Cited by 44 publications

References 12 publications

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

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

Spark plasma sintering and complex shapes: The deformed interfaces approach

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