Temperature distribution at steady state under constant current discharge in spark sintering process of Ti and Al2O3 powders

Matsugi, Kazuhiro; Kuramoto, Hideaki; Hatayama, Takashi; Yanagisawa, Osamu

doi:10.1016/s0924-0136(02)01039-7

Cited by 56 publications

(25 citation statements)

References 8 publications

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“…When needed, the ECR and TCR have been calculated using the tools dimensions and temperatures data. The order of magnitude of the ECR in horizontal/vertical directions and horizontal TCR is in accordance with [6,[10][11][12]16,17,22,24,25]. However the vertical TCR is a bit higher in our case (5.00E-03 m 2 K/W instead of about 5 E-04 m 2 K/W for [10,11,22,25] and 1.14E-03 m 2 K/W for [16]).…”

Section: Ex Situ/in Situ Discussionsupporting

confidence: 80%

“…These simulations are developed on numerical codes containing: i) an electro-thermal (ET) component to predict the temperature field and ii) a mechanical component (M) to predict the powder den-sification. Most of the time, for the ET component pure resistive heating is considered without any inductive effects which is a good approximation of the phenomena [6][7][8][9]. These models are able to predict the behavior of the electric current (different depending on the electric conductivity of the sample), the area of high heat generation often located in the punches or the presence of hot spots.…”

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: Ex Situ/in Situ Discussionsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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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“…Matsugi et al compared the temperature of electrically insulating Al 2 O 3 and conductive Ti samples in graphite molds, and reported that Ti was 10°C hotter than the mold, while the temperature of Al 2 O 3 was 30°C lower than the surrounding graphite. 27) Electrical current through conductive Ti powder induced Joule heat of the sample, thus caused heat flux from the sample to the mold. In contrast, the insulating sample was heated by conduction from the surrounding mold, because electrical current cannot pass through Al 2 O 3 .…”

Section: Densification Of Pre-treated Zrb 2 Powdermentioning

confidence: 99%

Low temperature densification of ZrB<sub>2</sub> by the mechanical pre-treatment of particles

Lee

Yun

et al. 2013

J. Ceram. Soc. Japan

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The effects of the pre-treatment of commercially available powder by high energy ball milling on the densification of highly refractory ZrB 2 were investigated. The pristine powder could be crushed into 10 nm in size by high energy ball milling. The resultant powder was densified, using spark plasma sintering apparatus under 120 MPa pressure. Dense ZrB 2 with fine microstructure was obtained after sintering at 1425°C for 1 h. The ultra-fine particle size of crushed ZrB 2 , and the deformation of the powders and grains by dislocation played important roles in the low temperature densification of the pre-treated ZrB 2 powder. WC, which was incorporated during the milling process from WCCo balls, formed a solid solution with ZrB 2 , and promoted grain growth at and above 1450°C. In contrast, Co was mostly segregated at the grain boundary. The 4-point bending strength of the specimens sintered at 1450°C was 481 MPa. The densification of ZrB 2 could be strongly promoted by high energy ball milling treatment of the raw powder, and the resultant specimens had good mechanical properties.

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“…Matsugi et al [4] developed a finite difference method (FDM) for coupling heat and electricity equations. From an experimental point of view, they placed thermocouples into punches, die, and samples with a conductive powder (Ti) and an insolating one (Al 2 O 3 ).…”

Section: State Of the Artmentioning

confidence: 99%

Temperature Control in Spark Plasma Sintering: An FEM Approach

Molenat

Durand

Galy

et al. 2010

Journal of Metallurgy

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Powder consolidation assisted by pulsed current and uniaxial pressure, namely, Spark Plasma Sintering (SPS), is increasingly popular. One limitation however lies in the difficulty of controlling the sample temperature during compaction. The aim of this work is to present a computational method for the assembly temperature based on the finite elements method (FEM). Computed temperatures have been compared with experimental data for three different dies filled with three materials with different electrical conductivities (TiAl, SiC, Al 2 O 3 ). The results obtained are encouraging: the difference between computed and experimental values is less than 5%. This allows thinking about this FEM approach as a predictive tool for selecting the right control temperatures in the SPS machine.

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Temperature distribution at steady state under constant current discharge in spark sintering process of Ti and Al2O3 powders

Cited by 56 publications

References 8 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

Low temperature densification of ZrB<sub>2</sub> by the mechanical pre-treatment of particles

Temperature Control in Spark Plasma Sintering: An FEM Approach

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