The invention disclosed relates to an oxidized
metal matrix composite coated substrate, comprising a substrate made of a material selected from the group consisting of a
chromia-forming Fe, Ni and / or Co based
alloy containing an amount of Cr
ranging from 16 to 30 wt %, and an
oxide-dispersion strengthened Cr-based
alloy and a plain Cr-based
alloy, and an oxidized
metal matrix
composite coating comprising at least two metals and reactive element
oxide particles in the form of a tri-layer scale on the
substrate surface comprising an inner
chromia layer, an intermediate layer of a
spinel solid solution formed by Cr and one or more of the deposited metals selected from the group consisting of Ni, Co, Cu, Mn, Fe and Zn and a mixture thereof, and an
electrically conductive top layer comprising oxides of one or more deposited metals selected from the group consisting of Ni, Co, Cu, Fe, Mn, Zn and a mixture thereof, which is substantially free from Cr ions, and wherein one or more of such
layers contain particles of doped or undoped oxides of a
rare earth metal selected from the group consisting of Ce, Y, La, Hf, Zr, Gd and a mixture thereof.