Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session 2

MM 18.41: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

A first study on the current-controlled flash sintering experiments on 3YSZ-Ni composites — •Pranav Rai and Devinder Yadav — Department of Metallurgical and Materials Engineering, Indian Institute of Technology Patna, Bihta, Patna 801106, India

Flash sintering involves densification of ceramic bodies in few seconds at relatively low furnace temperatures. The normal flash sintering experiments are characterized by a non-linear rise is the electrical conductivity of the sample. In the present work, flash sintering experiments were conducted in the current-controlled mode where the current is made to increase linearly through the sample at a constant rate. The sample sinters progressively as the current increases. Composites of 3YSZ and Ni, with different Ni contents (5wt.%, 10wt.%, and 20wt.%) were flash sintered at a constant current rate of 600 mA/min with a target current density of 100 mA/mm2, at a furnace temperature of 900°C. The total span of the experiments was 50 s. The extent of densification decreased with increase in Ni content. In addition, the samples with higher Ni content started to densify at a higher current density. XRD revealed oxidation of Ni in all the samples, post flash sintering. However, complete oxidation of Ni to NiO in conventional sintering of the same composites occurred at 1450°C after a hold time of 2 hours. The flash sintered microstructure of 3YSZ phase was characterized by relatively fine grains with narrow grain size distribution. The 3YSZ-20Ni samples exhibited a microstructure with percolating network of the NiO phase. The processed samples can have possible applications in designing the anode materials for solid oxide fuel cells.