%0 Journal Article
%A Mishra, Tarini Prasad
%A Laptev, Alexander
%A Ziegner, Mirko
%A Sistla, Sree Koundinya
%A Kaletsch, Anke
%A Broeckmann, Christoph
%A Guillon, Olivier
%A Bram, Martin
%T Field-Assisted Sintering/Spark Plasma Sintering of Gadolinium-Doped Ceria with Controlled Re-Oxidation for Crack Prevention
%J Materials
%V 13
%N 14
%@ 1996-1944
%C Basel
%I MDPI
%M FZJ-2020-02580
%P 3184 -
%D 2020
%Z Open Access Journal
%X Gadolinium-Doped Ceria (GDC) is a prospective material for application in electrochemical devices. Free sintering in air of GDC powder usually requires temperatures in the range of 1400 to 1600 °C and dwell time of several hours. Recently, it was demonstrated that sintering temperature can be significantly decreased, when sintering was performed in reducing atmosphere. Following re-oxidation at elevated temperatures was found to be a helpful measure to avoid sample failure. Sintering temperature and dwell time can be also decreased by use of Spark Plasma Sintering, also known as Field-Assisted Sintering Technique (FAST/SPS). In the present work, we combined for the first time the advantages of FAST/SPS technology and re-oxidation for sintering of GDC parts. However, GDC samples sintered by FAST/SPS were highly sensitive to fragmentation. Therefore, we investigated the factors responsible for this effect. Based on understanding of these factors, a special tool was designed enabling pressureless FAST/SPS sintering in controlled atmosphere. For proof of concept, a commercial GDC powder was sintered in this tool in reducing atmosphere (Ar-2.9%H2), followed by re-oxidation. The fragmentation of GDC samples was avoided and the number of micro-cracks was reduced to a minimum. Prospects of GDC sintering by FAST/SPS were discussed.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:32708746
%U <Go to ISI:>//WOS:000554233400001
%R 10.3390/ma13143184
%U https://juser.fz-juelich.de/record/878011