Sh. Hyun et al., Reinforcement of molten carbonate fuel cell matrixes by adding rod-shaped gamma-LiAlO2 particles, J MATER SCI, 36(2), 2001, pp. 441-450
Improvement in strength of gamma -LiAlO2 matrixes for a molten carbonate fu
el cell (MCFC) via addition of rod-shaped gamma -LiAlO2 particles has been
investigated. The rod-shaped gamma -LiAlO2 particles with the aspect ratio
of 9-15 were obtained by heat-treating rod-shaped beta -LiAlO2 particles at
800 degreesC for 3 h, synthesized from the reaction mixture of LiOH-gamma
-Al2O3-NaOH. The gamma -form was very stable for more than 700 h in a molte
n carbonate environment at 650 degreesC, while the beta -form showed both a
phase change from beta- to gamma -LiAlO2 and a morphology change from rod-
to bipyramid-shapes. The average pore size and the porosity of the matrix
(550 mum thickness) fabricated by tape-casting of the slurry with weight ra
tio 1.0 of rod-shaped gamma -LiAlO2 particles to commercial gamma -LiAlO2 p
owders (2.0 mum dia.) were about 0.12 mum and 54%, respectively, after bein
g heat-treated at 650 degreesC for 2 h. The strength (197 g(f)/mm(2)) of th
e rod- shaped particle reinforced matrixes was enhanced more than twice as
much as that of the non-reinforced gamma -LiAlO2 matrixes (91 g(f)/mm(2)).
(C) 2001 Kluwer Academic Publishers.