Component for solid oxide fuel cell
Disclosed is a component for solid oxide fuel cells that is excellent in both electrical conductivity and chromium poisoning resistance. As a substrate, a ferritic stainless steel having a chemical composition containing, in mass %, Cr: 14.0% to 32.0% and Al: 2.50% to 7.00% is used. Precious metal particles are coated on a surface of the substrate. The precious metal particles have: an average particle size of 1 μm or more and 10 μm or less; a coating thickness of 0.5 μm or more and 10 μm or less; and a surface coverage of 1.0% or more.
1 . A component for solid oxide fuel cells, comprising a substrate and precious metal particles on a surface of the substrate,
wherein the substrate is a ferritic stainless steel having a chemical composition consisting of, by mass %,
C: 0.025% or less,
Si: 0.05% to 1.00%,
Mn: 0.05% to 1.00%,
P: 0.050% or less,
S: 0.010% or less,
Cr: 14.0% to 32.0%,
Al: 2.50% to 7.00%,
Ni: 0.01% to 1.00%,
N: 0.025% or less, and
optionally at least one selected from the group consisting of:
Mo: 3.00% or less,
Cu: 0.50% or less,
W: 3.00% or less,
Ti: 0.15% or less,
Nb: 1.00% or less,
V: 0.50% or less,
Zr: 0.50% or less,
B: 0.0050% or less,
Ca: 0.0050% or less,
Mg: 0.0100% or less, and
REM: 0.20% or less, wherein REM is Sc, Y, La, Ce, Pr, Nd, Pm, Sm, and Hf, with the balance being Fe and inevitable impurities, and
wherein the precious metal particles have:
an average particle size of 5.3 μm or more and 10 μm or less;
a coating thickness on the substrate of 0.5 μm or more and 10 μm or less; and
a surface coverage on the substrate of 1.0% or more.
2 . The component for solid oxide fuel cells according to claim 1 , wherein the precious metal particles contain at least one selected from the group consisting of Au, Ag, Pt, Pd, Rh, Ir, Ru and Os, as well as alloy particles of these elements.