If rare-earth oxide-doped zirconia ceramics are applied in contact to solid or liquid steel, alloying elements of both ceramic and steel may undergo chemical reactions resulting in a detrimental destabilisation of tetragonal or cubic zirconia and scale formation at the contact interface. To separate the reactions corrosion between pure Y_2O_3 ceramic and HS6- 5-2 steel has been studied at 1330 deg C in air for 2 hours. Strong chemical reactions happened by migration of alloying elements such as Fe, Cr, V, Mo, and W into the ceramic. Several new phases such as YFeO_3, YIG (yttria iron garnet), YVO_3, YVO_4, and sesquioxide solution have been detected in the reaction zone by means EDX (Energy Dispersive X-ray Spectroscopy) and XRD (XRay Diffraction) analysis.
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