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Preparation of a Porous Cermet SOFC Anode Substrate by Gelcasting of NiO–YSZ Powders
Author(s) -
Prabhakaran Kuttan,
Melkeri Anand,
Beigh Mohd Oveas,
Gokhale Nitin Madhusudan,
Sharma Suresh Chandra
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01385.x
Subject(s) - materials science , cermet , yttria stabilized zirconia , non blocking i/o , porosity , scanning electron microscope , sintering , composite material , thermal spraying , substrate (aquarium) , chemical engineering , oxide , metallurgy , cubic zirconia , ceramic , coating , catalysis , biochemistry , chemistry , oceanography , engineering , geology
A porous NiO–YSZ substrate for anode‐supported solid oxide fuel cells has been prepared by gelcasting of NiO–YSZ powders using urea–formaldehyde monomers, followed by humidity‐controlled drying, binder removal, and sintering of the gelled bodies. The gelled bodies had sufficient strength to remove even 2‐mm‐thick samples from the mold immediately after gelation. A gelcast NiO–YSZ sample sintered at 1450°C for 2 h showed an open porosity of ∼53 vol%, and the porosity increased to ∼58% upon reduction with hydrogen. Pore sizes measured on the scanning electron microscopy photomicrograph of NiO–YSZ and Ni–YSZ cermet substrates are in the range of 2–5 μm. Urea–formaldehyde polymer, present in a high amount (∼13 wt%) in the gelcast body, acts as a template for pores.