Flash spark plasma sintering of ultrafine yttria-stabilized zirconia ceramics

Vasylkiv, Oleg; Borodianska, Hanna; Sakka, Yoshio; Demirskyi, Dmytro

doi:10.1016/j.scriptamat.2016.04.031

Cited by 48 publications

(33 citation statements)

References 24 publications

(51 reference statements)

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“…As reported by Zapata-Solvas et al [45], one possible heating source is graphite foil interposed between the punches and the electrically insulated mould. Another approach is to use a very thin graphite mould [32], graphite felt [35] or graphite paper [46] as a heating source.…”

Section: Sample Heating Up To T Onsetmentioning

confidence: 99%

“…Pt not only has the merit of being oxidation resistant up to high temperatures in air, but also might play a role in terms of catalytic activity in the exchange of oxygen at the electrodes. More recently FSPS employing graphite electrodes has been used for 3YSZ [46], however, electrode effects were not analysed in the paper. As shown in Figure 22, Ag used as electrode material contributed to the occurrence of FS in the case of β-Al 2 O 3 .…”

Section: Effects Of Electrode Materials and Its Catalytic Activitymentioning

confidence: 99%

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Review of flash sintering: materials, mechanisms and modelling

Grasso

McKinnon

et al. 2016

Advances in Applied Ceramics

376

248

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Flash sintering (FS) is an energy efficient sintering technique involving electrical Joule heating, which allows very rapid densification (<60 s) of particulate materials. Since the first publication on flash-sintered zirconia (3YSZ) in 2010, it has been intensively researched and applied to a wide range of materials. Going back more than a century ago, we have found a close similarity between FS of oxides and Nernst glowers developed in 1897. This review provides a comprehensive overview of FS and is based on a literature survey consisting of 88 papers and seven patents. It correlates processing parameters (i.e. electric field magnitude, current density, waveforms (AC, DC) and frequency, furnace temperature, electrode materials/ configuration, externally applied pressure and sintering atmosphere) with microstructures and densification mechanisms. Theorised mechanisms driving the rapid densification are substantiated by modelling work, advanced in situ analysis techniques and by established theories applied to electric current assisted/activated sintering techniques. The possibility of applying FS to a wider range of materials and its implementation in industrial scale processes are discussed.

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Section: Sample Heating Up To T Onsetmentioning

confidence: 99%

Section: Effects Of Electrode Materials and Its Catalytic Activitymentioning

confidence: 99%

Review of flash sintering: materials, mechanisms and modelling

Grasso

McKinnon

et al. 2016

Advances in Applied Ceramics

376

248

View full text Add to dashboard Cite

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“…This approach has been employed in both flash spark plasma sintering [27][28][29][30][31], where a commercial spark plasma sintering apparatus is used without the usual graphite mould and with high heating rates, and in a home-built approach using an induction furnace [32]. Uniaxial pressure can be applied at minimal or higher levels to maintain contact.…”

Section: Flash Sintering Apparatusmentioning

confidence: 99%

“…Samples have been flash sintered in dogbone [8,20,22,23,39,41,[71][72][73] and pellet form [26,31,36,37]. The apparatus used includes a vertical tube furnace with camera to detect shrinkage in dogbone samples [20,22,39,41,71,72], a box furnace with front window for use of a camera [8], a commercial spark plasma sintering machine used without the usual graphite mould [31], a vertical furnace adapted to hold pellets by the use of alumina supporting bars with [26,37] or without [36] significant applied load, and a modified system holding suspended dogbones designed for in situ X-ray diffraction studies [23,73].…”

Section: Zirconiamentioning

confidence: 99%

Flash sintering of ceramic materials

Dancer¹

2016

Mater. Res. Express

150

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During flash sintering, ceramic materials can sinter to high density in a matter of seconds while subjected to electric field and elevated temperature. This process, which occurs at lower furnace temperatures and in shorter times than both conventional ceramic sintering and field-assisted methods such as spark plasma sintering, has the potential to radically reduce the power consumption required for the densification of ceramic materials. This paper reviews the experimental work on flash sintering methods carried out to date, and compares the properties of the materials obtained to those produced by conventional sintering. The flash sintering process is described for oxides of zirconium, yttrium, aluminium, tin, zinc, and titanium; silicon and boron carbide, zirconium diboride, materials for solid oxide fuel applications, ferroelectric materials, and composite materials. While experimental observations have been made on a wide range of materials, understanding of the underlying mechanisms responsible for the onset and latter stages of flash sintering is still elusive. Elements of the proposed theories to explain the observed behaviour include extensive Joule heating throughout the material causing thermal runaway, arrested by the current limitation in the power supply, and the formation of defect avalanches which rapidly and dramatically increase the sample conductivity.Undoubtedly, the flash sintering process is affected by the electric field strength, furnace temperature and current density limit, but also by microstructural features such as the presence of second phase particles or dopants and the particle size in the starting material. While further experimental work and modelling is still required to attain a full understanding capable of predicting the success of the flash sintering process in different materials, the technique nonetheless holds great potential for exceptional control of the ceramic sintering process.

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“…The use of rapid heating has been widely investigated for the consolidation and densification of materials. 4) However, its application in other areas of materials processing -such as synthesis, crystal growth and chemical reactions -remains to be investigated. Only some recent work from Liu et al 5) explored the possibility to produce eutectic ceramics during the FS consolidation of Al 2 O 3 Y 3 Al 5 O 12 ZrO 2 powder mixture.…”

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confidence: 99%

Growth of SiC platelets using contactless flash technique

Wang¹,

Dong

Grasso

et al. 2016

J. Ceram. Soc. Japan

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It is demonstrated that a Contactless Flash Technique (CFT) can be employed to fabricate large SiC platelets. The rapid crystal growth of the platelets is attributed to the high temperatures (estimated µ2300°C) reached by the sample during the 33 s process. The SiC platelets consisted of elongated hexagonal crystals (thickness between 24¯m, length up 50100¯m) with their c-axis corresponding to the slow growth direction. The mechanisms involved in the development of the platelet morphology are discussed in relation to well-established literature on the conventional growth of SiC platelets.

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Flash spark plasma sintering of ultrafine yttria-stabilized zirconia ceramics

Cited by 48 publications

References 24 publications

Review of flash sintering: materials, mechanisms and modelling

Review of flash sintering: materials, mechanisms and modelling

Flash sintering of ceramic materials

Growth of SiC platelets using contactless flash technique

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