ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A new method for SOFC fuel cell anode preparation is proposed where the maindifference lies over cermet powder processing by high energy milling. Yttria stabilized zirconiapowder and metallic nickel undergo co-milling in a vibratory device employing zirconia beadmedia. Dispersed and homogeneous powders are therefore obtained. The material is presseduniaxialy and sintered at 1350°C for 0,5 h in air and under argon and hydrogen. In the former case,partial nickel oxidation occurs before sintering leading to small shrinkage down to 2% and porosityabout 38%. Linear shrinkages from 5 to 7% after sintering in both inert and reduced atmosphereswere observed not demanding pore-former additives. Conventional YSZ, Ni and NiO powdermixtures were prepared for comparison purpose. The high energy milling process is able to reducethe starting sintering temperature by 130° C besides a higher densification compared to the simplemixtures YSZ+Ni. The excessive sintering and particle coalescence is absent in high energy milledmaterial, where the metal is well dispersed and the microstructure is highly homogenous. The highenergy milling process is a promising route to prepare with excellent performance anode materialsfor SOFC cells
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.514.pdf
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