Fundamentals of Spark-Plasma Sintering: Applications to Net-Shaping of High Strength Temperature Resistant Components

Olevsky, Eugene A.; Khaleghi, Evan; Garcı́a, C.; Bradbury, William L.

doi:10.4028/www.scientific.net/msf.654-656.412

Cited by 20 publications

(20 citation statements)

References 6 publications

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“…In our earlier work, COMSOL ™ finite element package has been utilized in the above‐mentioned way, thereby enabling the first three‐dimensional fully‐coupled, parallel (same time iteration step) thermo‐electro‐mechanical analysis of the material processing under SPS conditions. In the present article, we describe this approach in detail, applying it for the investigation of SPS scalability potential.…”

Section: Introductionmentioning

confidence: 99%

Fundamental Aspects of Spark Plasma Sintering: II. Finite Element Analysis of Scalability

et al. 2012

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A comprehensive three‐dimensional fully coupled thermo‐electro‐mechanical finite element framework is developed for modeling spark plasma sintering (SPS). The finite element model is applied to the simulation of spark plasma processing with four different tooling sizes and various temperature regimes. The comparison of modeling and experimental results shows that the model is reliable for qualitative predictions of the densification behavior and of the grain growth in powder specimens subjected to SPS with a given temperature regime. The conducted modeling indicates the possibility of changing the heating pattern of the specimen (warmer central areas of the specimen's volume and cooler outside areas or vice versa) depending on the size of the tooling. High heating rates and large specimen sizes elevate the temperature and, in turn, material structure gradients during SPS processing. The obtained results suggest that the industrial implementation of SPS techniques should be based on the predictive capability of reliable modeling approaches.

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Section: Introductionmentioning

confidence: 99%

Fundamental Aspects of Spark Plasma Sintering: II. Finite Element Analysis of Scalability

et al. 2012

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“…This limitation, however, is not specific of SPS, but is shared by other techniques involving uniaxial pressing, including hot-pressing. Few successful attempts of producing complex shapes have been presented in the open literature [63][64][65][66], but the topic did not receive large attention. Some patents have been focusing on the possibility of extending the HIP approach to SPS using a gas or a powder as a pressure transfer medium, but the example of applications is still extremely limited [2,3].…”

Section: Industrial Relevancementioning

confidence: 99%

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

Anselmi‐Tamburini

Groza

2017

Materials Science and Technology

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The interest towards field-assisted sintering techniques has been growing rapidly in the last 20 years, particularly in applications involving hard to sinter materials, such as nanocrystalline, refractory, and metastable materials. These techniques, in fact, allow obtaining the densification in conditions that are considerably milder than in traditional pressureless sintering or in hot-pressing. Despite this success, there is still a poor understanding of the involved basic mechanisms. In this assessment, all the main aspects associated with the use of these technique will be presented and discussed, with particular emphasis on spark plasma sintering. ARTICLE HISTORY

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“…Localized electrical current at particle contacts can also contribute to mass transport through electromigration effects which would alter local densification kinetics [11]. This dramatic variation in properties can have a profound effect on the local temperature history and resulting final properties/performance of the part [2,3,12].…”

Section: Introductionmentioning

confidence: 98%

“…Prior modeling efforts to understand thermal-electric gradients during FAST processing include analytical [13], finite difference method [14,15], and finite element modeling (FEM) [1][2][3][4][5]12]. These works generally focus on calculating the temperature and electrical distribution within the system and have shown that the conductivity of the compact plays a large role.…”

Section: Introductionmentioning

confidence: 99%

Fully coupled thermal–electric-sintering simulation of electric field assisted sintering of net-shape compacts

McWilliams

Zavaliangos

2014

J Mater Sci

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A fully coupled thermal-electric-sintering finite element model was developed and implemented to predict heterogeneous densification in net-shape compacts using electric field assisted sintering techniques (FAST). FAST is a single-step processing operation for producing bulk materials from powders, in which the powder is heated by the application of electric current under pressure. Previous modeling efforts on FAST have mostly considered the thermal-electric aspect of the problem and have largely neglected the sintering aspect of the problem. A new model was developed by integrating a phenomenological sintering model into a previously established thermal-electric finite element framework to predict the densification kinetics of the sample. The model was used to quantify the effect of specimen geometry on the evolution of thermoelectric gradients and resulting heterogeneous sintering kinetics during FAST processing of a conductive powder. It is shown that the new model which considers sintering kinetics and density-dependent properties provides a substantial increase in accuracy compared to thermal-electric only models. It is also shown that small changes in local resistance due to densification can greatly impact the distribution of thermoelectric gradients during the process, which are exacerbated by heterogeneous stress states induced by sample geometry. Experimental characterization of sintered specimens is used to provide qualitative validation of the model predictions.

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Fundamentals of Spark-Plasma Sintering: Applications to Net-Shaping of High Strength Temperature Resistant Components

Cited by 20 publications

References 6 publications

Fundamental Aspects of Spark Plasma Sintering: II. Finite Element Analysis of Scalability

Fundamental Aspects of Spark Plasma Sintering: II. Finite Element Analysis of Scalability

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

Fully coupled thermal–electric-sintering simulation of electric field assisted sintering of net-shape compacts

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