| Autor: |
Cui, Kunkun, Shen, Xin, Zhang, Yingyi, Wang, Hong, Mao, Haobo, Zhu, Junjie |
| Zdroj: |
Journal of Materials Research and Technology; July-August 2023, Vol. 25 Issue: 1 p5520-5537, 18p |
| Abstrakt: |
Al2O3–Cr2O3refractories have excellent slag corrosion resistance and can adapt to the oxidation/reduction atmosphere in the smelting reduction ironmaking furnace. Improving the corrosion resistance of chrome corundum refractories is of great significance for extending the life length of industrial kilns and decreasing carbon emissions. In this work, the influences of ZrO2content on the phase evolution, microstructure, physicochemical properties, mechanical properties and slag corrosion resistance of the ZrO2reinforced Al2O3–Cr2O3composite refractories were investigated. The results show that the ZrO2reinforced Al2O3–Cr2O3composites are primarily composed of (Al, Cr)2O3solid solution and m-ZrO2. The compressive strength, flexural strength and hardness of the composite refractories can be improved by adding 2.5 wt% ZrO2. However, adding more ZrO2will reduce its mechanical properties. This is due to ZrO2excessive content will augement the porosity of the composite refractories, and the phase transformation of ZrO2will also lead to the formation of microcracks during the cooling process. It is worth noting that higher ZrO2content improves the thermal shock resistance of the composites, which is primarily put down to the microcrack toughening mechanism of ZrO2. The corrosion tests show that the thicknesses of the corrosion and infiltration layers of composite refractories are significantly decreased accompanied by ZrO2content increase. This is because the formation of high melting point CaZr4O9reduces the CaO content and slag alkalinity, and inhibits the dissolution of Al2O3into the slag to a certain extent. Therefore, the slag corrosion/penetration resistance of the of the composites are obviously improved with the increase of ZrO2addition. |
| Databáze: |
Supplemental Index |
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