Home > Publications database > Current-rate flash sintering of gadolinium doped ceria: Microstructure and Defect generation > print

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024 7 _ |a 10.1016/j.actamat.2020.02.036
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100 1 _ |a Mishra, Tarini Prasad
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245 _ _ |a Current-rate flash sintering of gadolinium doped ceria: Microstructure and Defect generation
260 _ _ |a Amsterdam [u.a.]
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520 _ _ |a In current-rate flash-sintering experiments the current is injected into the specimen from the very start and then increased at a constant rate, while the furnace is held at a constant temperature. The power supply remains under current control. The flash is induced at low current densities which reduces local heating at the electrodes. It leads to a uniform grain size across the entire gage length of the dog-bone specimen. This work pertains to 10 mol.% gadolinium-doped ceria flash sintered at current-rates ranging from 50 mA min−1 to 1000 mA min−1 at a furnace temperature of 680 °C. Full densities are obtained at a current density limit of 200 mA mm–2. Densification is shown to depend only on the instantaneous value of the current density, and not on the current-rate. The grain size, however, is shown to become finer at higher current-rates. A preliminary analysis of the “energy deficit”, that is, the estimated power input corresponding to the temperature as measured with a pyrometer, and the actual power consumption, estimates that huge concentrations of Frenkel defects may be introduced in the flash process.
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700 1 _ |a Neto, Rubens Roberto Ingraci
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700 1 _ |a Raj, Rishi
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700 1 _ |a Guillon, Olivier
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700 1 _ |a Bram, Martin
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773 _ _ |a 10.1016/j.actamat.2020.02.036
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