Control of experimental conditions in reaction flash-sintering of complex stoichiometry ceramics

Gil‐González, Eva; Perejón, Antonio; González, Daniel Román; Pérez‐Maqueda, Luis A.

doi:10.1016/j.ceramint.2020.05.091

Cited by 23 publications

(12 citation statements)

References 62 publications

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“…This is probably due to the advantages of reduced temperatures and times offered by the technique. A significant number of works have been dedicated to the preparation of high-entropy oxides [111][112][113][114][115], followed by ceramics such as the multiferroic BiFeO 3 and related materials [27,80,116], solid electrolytes [117][118][119], or the lead-free piezoelectric potassium sodium niobate [120,121]. Analogously to Zirconia or ZnO in FS, the underlying mechanisms in RFS have been studied by high-resolution in situ measurements in the reaction of MgO and Al 2 O 3 to form the spinel MgAl 2 O 4 [122,123] .…”

Section: Discussionmentioning

confidence: 99%

Flash Sintering Research Perspective: A Bibliometric Analysis

2022

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Flash Sintering (FS), a relatively new Field-Assisted Sintering Technique (FAST) for ceramic processing, was proposed for the first time in 2010 by Prof. Rishi Raj’s group from the University of Colorado at Boulder. It quickly grabbed the attention of the scientific community and since then, the field has rapidly evolved, constituting a true milestone in materials processing with the number of publications growing year by year. Moreover, nowadays, there is already a scientific community devoted to FS. In this work, a general picture of the scientific landscape of FS is drawn by bibliometric analysis. The target sources, the most relevant documents, hot and trending topics as well as the social networking of FS are unveiled. A separate bibliometric analysis is also provided for Reaction or Reactive Flash Sintering (RFS), where not only the sintering, but also the synthesis is merged into a single step. To the best of our knowledge, this is the first study of this nature carried out in this field of research and it can constitute a useful tool for researchers to be quickly updated with FS as well as to strategize future research and publishing approaches.

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Section: Discussionmentioning

confidence: 99%

Flash Sintering Research Perspective: A Bibliometric Analysis

2022

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“…Furthermore, as the uniformity of densification in flash is related to the spatial distribution of the current density, 3 it is necessary to feed the current into the specimen in such a way that the current flows with a uniform concentration throughout the green body, a nearly impossible task for a specimen with a complex three‐dimensional geometry. The uniformity of current density is also critical in “reactive flash sintering” where mixtures of elemental oxide powders react and coalesce at the atomic scale to produce a single phase, multicomponent ceramic within a span of a few seconds 4 …”

Section: Introductionmentioning

confidence: 99%

Touch‐free flash sintering with magnetic induction within a reactor activated by the usual flash method

Jalali

Raj

2022

J Am Ceram Soc.

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We describe a new system for flash sintering where a reactor is built with walls made from dog-bone specimens that are held in Stage III of flash under current control. The reactor is placed within a cylindrical space, like a tube, with axial access, for camera, pyrometer, and optical spectrometer. A free-floating green sample (without electrodes) is placed within; it is physically separated from the walls of the reactor. In the present experiments, the reactor wall as well as the "touch free" workpiece were constituted from yttria-stabilized zirconia. The workpiece is shown to flash, luminesce, and sinter (in a few seconds) when a modest magnetic field is superimposed over the reactor. The final density depends on the strength of the magnetic field, eventually rising to ∼98%. The grain size is highly uniform and nanoscale. Samples of different and arbitrary three-dimensional shapes have been so sintered. We propose that the walls of the reactor, which are in a constant state of flash, may generate an evanescent plasma that becomes concentrated around the center line of the reactor by the applied magnetic field. The plasma field helps to transfer energy from the reactor walls into the green sample. When the magnetic induction is turned on, the conductive load of the reactor walls on the power supply increases proving the presence of an energy transfer mechanism. The question of impedance matching between the walls, the specimen, and the free space in between is outlined.

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“…Moreover, it has been recently developed the so-called "Reactive-Flash Sintering", which merges sintering and chemical reaction in a single step [25] . This technique has been successfully applied to the preparation and processing of advanced ceramics with complex stoichiometry [26][27][28][29] .…”

Section: Introductionmentioning

confidence: 99%