This title appears in the Scientific Report :
2020
Please use the identifier:
http://hdl.handle.net/2128/25641 in citations.
Please use the identifier: http://dx.doi.org/10.3390/ma13143184 in citations.
Field-Assisted Sintering/Spark Plasma Sintering of Gadolinium-Doped Ceria with Controlled Re-Oxidation for Crack Prevention
Field-Assisted Sintering/Spark Plasma Sintering of Gadolinium-Doped Ceria with Controlled Re-Oxidation for Crack Prevention
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 signif...
Saved in:
Personal Name(s): | Mishra, Tarini Prasad |
---|---|
Laptev, Alexander (Corresponding author) / Ziegner, Mirko / Sistla, Sree Koundinya / Kaletsch, Anke / Broeckmann, Christoph / Guillon, Olivier / Bram, Martin | |
Contributing Institute: |
Werkstoffstruktur und -eigenschaften; IEK-2 JARA-ENERGY; JARA-ENERGY Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Materials, 13 (2020) 14, S. 3184 - |
Imprint: |
Basel
MDPI
2020
|
DOI: |
10.3390/ma13143184 |
PubMed ID: |
32708746 |
Document Type: |
Journal Article |
Research Program: |
SPP 1959: Manipulation of matter controlled by electric and magnetic fields: Towards novel synthesis and processing routes of inorganic materials ohne Topic |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.3390/ma13143184 in citations.
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. |