Abstract
The post-service ZrO2 sliding gate for converter slag-retaining was examined by XRD, SEM, EDS and X-CT to investigate its corrosion mechanism. The results show that m-ZrO2 in the hot working layer transform into stable t-ZrO2, and cracks and flaws are generated due to the accompanied volume contraction, leading to severe slag penetration. The CaO in the slag preferentially reacts with ZrO2, forming a CaZrO3 dense layer with a high melting point to prevent slag penetration. While SiO2-Al2O3-FeO component in the slag removes the MgO stabilizer out of Mg-PSZ crystals, causing destabilization and decomposition of the Mg-PSZ grains. The microstructure loses its integrity and is easily spalled. A corrosion model was established.
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