Analysis of Mechanisms of Spark-Plasma Sintering

Olevsky, Eugene A.; Kandukuri, Sastry; Froyen, Ludo

doi:10.4028/www.scientific.net/kem.368-372.1580

Cited by 18 publications

(12 citation statements)

References 13 publications

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“…In any of such cases, SPS/CAPAD is characterized by high heating rates and overall greatly reduced processing times, enabling the development of novel materials with nanoscale grains, metastable phases, ne-tuned structures and constituents' combinations. [33][34][35][36][37][38][39][40][41][42][43] In the present work, SPS was applied to supercrystalline iron oxide/oleic acid nanocomposites, in order to obtain nanostructured iron oxide-based ceramics with ne-tuned mechanical and magnetic properties. The predominant iron oxide phase was magnetite (Fe 3 O 4 ).…”

Section: Introductionmentioning

confidence: 99%

Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials

et al. 2019

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“…The densification mechanism under SPS processing also drew researchers’ attention. Research interests included the role of electrical current and field effects [ 18 , 19 , 20 , 21 ], high heating rate [ 22 ], diffusional effects [ 23 , 24 ], and non-linear (power-law) creep under high temperature and pressure [ 1 , 25 , 26 ]. In order to elucidate the creep mechanism of ZrC powder undergoing SPS, Gendre et al estimated the creep exponent, n , and the activation energy, Q , of ZrC undergoing the dwelling stage of SPS by using an empirical model [ 1 ] based on Ashby’s hot pressing diagrams [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Spark Plasma Sintering of Commercial Zirconium Carbide Powders: Densification Behavior and Mechanical Properties

et al. 2015

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Commercial zirconium carbide (ZrC) powder is consolidated by Spark Plasma Sintering (SPS). Processing temperatures range from 1650 to 2100 °C. Specimens with various density levels are obtained when performing single-die SPS at different temperatures. Besides the single-die tooling setup, a double-die tooling setup is employed to largely increase the actual applied pressure to achieve higher densification in a shorter processing time. In order to describe the densification mechanism of ZrC powder under SPS conditions, a power-law creep constitutive equation is utilized, whose coefficients are determined by the inverse regression of the obtained experimental data. The densification of the selected ZrC powder is shown to be likely associated with grain boundary sliding and dislocation glide controlled creep. Transverse rupture strength and microhardness of sintered specimens are measured to be up to 380 MPa and 24 GPa, respectively. Mechanical properties are correlated with specimens’ average grain size and relative density to elucidate the co-factor dependencies.

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“…Few constitutive models have been proposed, focusing on the influence of governing parameters of a thermal and non-thermal nature [6,7,8,9,10,11,12,13,14,15,16,17,18], while the need for reliable numerical simulation approaches was becoming gradually more important. Some studies could consider only uncoupled physical aspects of SPS [19,20,21,22,23,24,25,26,27,28], while, on the other hand, coupled modeling offers the opportunity of predicting the real outcomes of experimental procedures.…”

Section: Introductionmentioning

confidence: 99%

Localized Overheating Phenomena and Optimization of Spark-Plasma Sintering Tooling Design

et al. 2013

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The present paper shows the application of a three-dimensional coupled electrical, thermal, mechanical finite element macro-scale modeling framework of Spark Plasma Sintering (SPS) to an actual problem of SPS tooling overheating, encountered during SPS experimentation. The overheating phenomenon is analyzed by varying the geometry of the tooling that exhibits the problem, namely by modeling various tooling configurations involving sequences of disk-shape spacers with step-wise increasing radii. The analysis is conducted by means of finite element simulations, intended to obtain temperature spatial distributions in the graphite press-forms, including punches, dies, and spacers; to identify the temperature peaks and their respective timing, and to propose a more suitable SPS tooling configuration with the avoidance of the overheating as a final aim. Electric currents-based Joule heating, heat transfer, mechanical conditions, and densification are imbedded in the model, utilizing the finite-element software COMSOL™, which possesses a distinguishing ability of coupling multiple physics. Thereby the implementation of a finite element method applicable to a broad range of SPS procedures is carried out, together with the more specific optimization of the SPS tooling design when dealing with excessive heating phenomena.

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Analysis of Mechanisms of Spark-Plasma Sintering

Cited by 18 publications

References 13 publications

Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials

Iron oxide-based nanostructured ceramics with tailored magnetic and mechanical properties: development of mechanically robust, bulk superparamagnetic materials

Spark Plasma Sintering of Commercial Zirconium Carbide Powders: Densification Behavior and Mechanical Properties

Localized Overheating Phenomena and Optimization of Spark-Plasma Sintering Tooling Design

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