Effect of the current pulse pattern during heating in a spark plasma sintering device: Experimental and numerical modeling approaches

Diatta, Joseph Sambasene; Antou, Guy; Courrèges, Fabien; Georges, Mathias; Pradeilles, Nicolas; Maı̂tre, Alexandre

doi:10.1016/j.jmatprotec.2017.03.004

Cited by 11 publications

(2 citation statements)

References 25 publications

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“…However, the whole of the physical phenomena promoted by the combination of high-pulsed electric current and mechanical loading has not been clearly understood so far [20][21][22][23][24]. Many questions about the electrical, thermal and mechanical mechanisms involved during SPS treatment remain unanswered.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Electrical Transitions in the First Steps of Spark Plasma Sintering: Effects of Pre-Oxidation and Mechanical Loading within Copper Granular Media

et al. 2022

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Spark Plasma Sintering (SPS) has become a conventional and promising sintering method for powder consolidation. This study aims to well understand the mechanisms of densification encountered during SPS treatments, especially in the early stages of sintering. The direct current (DC) electrical behavior of copper granular medium is characterized. Their properties are correlated with their microstructural evolutions through post-mortem scanning electron microscope (SEM) observations to allow a thorough understanding of the involved Branly effect that is suspected to occur in SPS. The electrical response is studied by modifying the initial thickness of the oxide layer on particles surfaces and applying various mechanical loads on the granular medium. Without load and at low current, the measured quasi-reversible behavior is connected to the formation of spots at the microcontacts between the particles. By increasing the current, the Branly transition from an insulating to a conductive state suddenly occurs. The insulating oxide layer is destroyed, and micro-bridges are created. The application of a mechanical pressure strongly modifies the DC Branly effect. Increasing low stress leads to a strong decrease in the breakdown field. For high-applied pressure, successive drops in the electric field are detected during the electrical transition. These successive drops are induced by microcracking of the insulating oxide layer.

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Section: Introductionmentioning

confidence: 99%

Investigation of Electrical Transitions in the First Steps of Spark Plasma Sintering: Effects of Pre-Oxidation and Mechanical Loading within Copper Granular Media

et al. 2022

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“…The spark plasma sintering (SPS) technique is nowadays considered to be one of the most advanced sintering techniques. This method, which involves high loads and well controllable high heating/cooling rates [ 1 ], is capable of retaining fine-grained microstructure because of short sintering times [ 2 , 3 ]. Besides, it can enhance densification in comparison with other techniques regardless of the thin oxide shell often present on the particles’ surface [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Short Attritor-Milling of Magnesium Alloy Powder Prior to Spark Plasma Sintering

et al. 2020

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The spark plasma sintering (SPS) technique was employed to prepare compacts from (i) gas-atomized and (ii) attritor-milled AE42 magnesium powder. Short attritor-milling was used mainly to disrupt the MgO shell covering the powder particles and, in turn, to enhance consolidation during sintering. Compacts prepared by SPS from the milled powder featured finer microstructures than compacts consolidated from gas-atomized powder (i.e., without milling), regardless of the sintering temperatures in the range of 400–550 °C. Furthermore, the grain growth associated with the increase in the sintering temperature in these samples was less pronounced than in the samples prepared from gas-atomized particles. Consequently, the mechanical properties were significantly enhanced in the material made of milled powder. Apart from grain refinement, the improvements in mechanical performance were attributed to the synergic effect of the irregular shape of the milled particles and better consolidation due to effectively disrupted MgO shells, thus suppressing the crack formation and propagation during loading. These results suggest that relatively short milling of magnesium alloy powder can be effectively used to achieve superior mechanical properties during consolidation by SPS even at relatively low temperatures.

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Highly oriented β″-alumina ceramics with excellent ionic conductivity and mechanical performance obtained by spark plasma sintering technique

Yang

Zhang

2020

J Mater Sci

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Effect of the current pulse pattern during heating in a spark plasma sintering device: Experimental and numerical modeling approaches

Cited by 11 publications

References 25 publications

Investigation of Electrical Transitions in the First Steps of Spark Plasma Sintering: Effects of Pre-Oxidation and Mechanical Loading within Copper Granular Media

Investigation of Electrical Transitions in the First Steps of Spark Plasma Sintering: Effects of Pre-Oxidation and Mechanical Loading within Copper Granular Media

Effect of Short Attritor-Milling of Magnesium Alloy Powder Prior to Spark Plasma Sintering

Highly oriented β″-alumina ceramics with excellent ionic conductivity and mechanical performance obtained by spark plasma sintering technique

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