A Huge Effect of Weak dc Electrical Fields on Grain Growth in Zirconia

Ghosh, Santonu; Chokshi, Atul H.; Lee, Pilhwa; Raj, Rishi

doi:10.1111/j.1551-2916.2009.03102.x

Cited by 161 publications

(143 citation statements)

References 20 publications

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“…The presence of an electrical field can potentially affect surface phenomena by modifying the grain boundary energy and interface kinetics [23]. This high energy induces the formation of sintering neck at an early stage of densification (first sintering step) between adjacent grains [24,25].…”

Section: Fig 3 Represents the Fe-sem Fracture Surface Of Las Samplesmentioning

confidence: 99%

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Benavente

Salvador

Moreno

et al. 2014

Int J Applied Ceramic Tech

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Lithium aluminosilicate was fabricated by conventional and non-conventional sintering:microwave and spark plasma sintering, from 1200 to 1300 ºC. A considerable difference in densification, microstructure, coefficient of thermal expansion behavior and hardness and Young's modulus was observed. Microwave technology made possible to obtain fully dense glass-free lithium aluminosilicate bulk material (>99%) with near-zero and controlled coefficient of thermal expansion and relatively high mechanical properties 1 (7.1 GPa of hardness and 110 GPa of Young's modulus) compared to the other two processes. It is believed that the heating mode and effective particle packing by microwave sintering are responsible to improve these properties.

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Section: Fig 3 Represents the Fe-sem Fracture Surface Of Las Samplesmentioning

confidence: 99%

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Benavente

Salvador

Moreno

et al. 2014

Int J Applied Ceramic Tech

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show abstract

“…The electric field-assisted pressureless sintering technique has mainly been applied to yttria-stabilized zirconia ceramics [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Many other reports were published applying this technique to other materials [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], studying the dependence on the amplitudes of the electric field and current density [31], on the average particle size [32], on the porosity [33], and searching for an explanation of such events [34][35][36][37][38][39][40].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, grain growth is inhibited in yttria-stabilized zirconia [2][3][4][5]. The electric field can be applied either during heating up to a temperature below the conventional sintering temperature or at a fixed temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The first paper announcing the development of the flash sintering technique was focused on the study of the influence of the electric field on the sintering rate of 3 mol % yttria-stabilized zirconia (3YSZ) [3]; the sample was submitted to a 4 V·cm −1 DC electric field, producing an increase of the sintering rate. It was proposed that the sintering rate increased due to the retardation of the grain growth dynamics as a consequence of the application of the electric field, with acceleration of the densification.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Behavior and Microstructural Features of Electric Field-Assisted and Conventionally Sintered 3 mol% Yttria-Stabilized Zirconia

Carvalho¹,

Muccillo²,

Muccillo

2018

Ceramics

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ZrO 2 : 3 mol % Y 2 O 3 (3YSZ) polycrystalline pellets were sintered at 1400 • C and by applying an alternating current (AC) electric field at 1000 • C. An alumina sample holder with platinum wires for connecting the sample to a power supply was designed for the electric field-assisted sintering experiments. The apparent density was evaluated with the Archimedes technique, the grain size distribution by analysis of scanning electron microscopy images, and the electrical behavior by the impedance spectroscopy technique. Sintering with the application of AC electric fields to 3YSZ enhances its ionic conductivity. An explanation is proposed, based on the dissolution back to the bulk of chemical species, which are depleted at the grain boundaries, leading to an increase in the oxygen vacancy concentration. For the enhancement of the grain boundary conductivity, an explanation is given based on the diminution of the concentration of depleted chemical species, which migrate to the bulk. This migration leads to a decrease of the potential barrier of the space charge region, known to be responsible for blocking the oxide ions through the intergranular region. Moreover, the heterogeneity of the distribution of the grain sizes is ascribed to the skin effect, the tendency of the AC current density to be largest near the surface, decreasing towards the bulk.

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“…The low sintering temperatures in SPS, compared to other sintering techniques, are certainly related to the electric field applied for heating. The electric field may enhance the densification by accelerating diffusion, 1),2) suppressing grain growth 3) or softening particle surfaces. 4) Though the exact mechanism is unclear, it was proven experimentally that the application of electric field contributes to lower the sintering temperature by enhancing densification.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature spark plasma sintering of alumina by using SiC molding set

Kim

Dash²,

Kim

et al. 2016

J. Ceram. Soc. Japan

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Fully dense transparent alumina is obtained after spark plasma sintering at 1000°C by using the electrically conductive SiC molding set. Compared to the conventional graphite set, the new mold material lowered the sintering temperature by 150°C for full densification. The SiC set has a lower electrical conductivity than that of the graphite set, which resulted in higher electric field during heating. The enhanced densification is attributed to the high electric field. In this study, the effects of the electric field and the heating rate on the densification of alumina are examined with the SiC molding set, and compared to the results with the graphite set.

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A Huge Effect of Weak dc Electrical Fields on Grain Growth in Zirconia

Cited by 161 publications

References 20 publications

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Microwave, Spark Plasma and Conventional Sintering to Obtain Controlled Thermal Expansion β‐Eucryptite Materials

Electrical Behavior and Microstructural Features of Electric Field-Assisted and Conventionally Sintered 3 mol% Yttria-Stabilized Zirconia

Low-temperature spark plasma sintering of alumina by using SiC molding set

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