Investigations of iron-alumina metal-ceramic composites: Effect of ruthenium and nickel on the hydrogen reduction of trivalent iron during the formation of the composite

Abstract

Effect of ruthenium and nickel on the reduction behavior of Fe3+/Al2O3 to give the Fe-Al2O3 metal-ceramic composite has been studied by employing x-ray diffraction, 57Fe Mossbauer spectroscopy and electron microscopy. Both ruthenium and nickel promote the hydrogen reduction of Fe3+, giving nearly total reduction to the metallic phase at 1220K. Besides metallic iron in the ferromagnetic alpha-form, paramagnetic alloys of Fe with Ru and Ni are formed during the reduction.