Taylor, Scott (2010)
M.Res. thesis, University of Birmingham.
Issues with nickel agglomeration and reduced porosity of SOFC anode tubes have been noted in previous investigations using carbon black as a porosity forming agent, this thesis looks at methods of improving these issues by investigation of alternative materials (carbon, graphite, flour) along with alternative processing methods. The porosity forming agent of the SOFC anode was investigated to establish the most effective material to improve nickel dispersion. The effect of powder processing by milling to improve mixing and particle size distribution within the anode mixture before extrusion and sintering was also investigated. Powder processing by means of milling was seen to offer significant improvements in dispersion of nickel over the surface of tubes, along with a distinct improvement in the porosity of the sintered tubes. Of the three porosity forming agents investigated wheat flour offered the best solution to the issues of nickel dispersion and increasing tube porosity, it was also found to be the easiest material to process and form into tubes.
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