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以电熔镁砂和高纯尖晶石作为主体原料,研究氧化铝、氧化铬两种添加剂对方镁石-尖晶石材料抗钢水侵蚀性的影响。首先针对原料性质对试样进行高压成形、高温烧成处理,烧后试样利用感应炉炼钢机理进行抗钢水侵蚀性试验。利用反光显微镜对侵蚀后试样进行显微观察,结果发现:加入Al2O3与Cr2O3有利于方镁石-尖晶石材料基质中镁铝尖晶石和镁铬尖晶石的合成,但不利于提高方镁石-尖晶石材料的抗钢水侵蚀性。通过热力学分析,Al2O3、Cr2O3、镁铬尖晶石和镁铝尖晶石在钢水中平衡氧含量高,溶解度较大。Cr2O3和镁铬尖晶石较Al2O3和镁铝尖晶石在钢水中的平衡氧含量大,更容易在钢水中分解。
Taking fused magnesia and high-purity spinel as the main raw materials, the effects of alumina and chromic oxide additives on the erosion resistance of periclase-spinel materials to molten steel were studied. First of all, according to the nature of the raw material, high-pressure forming and high-temperature firing treatment were performed on the sample. After being burned, the induction furnace steelmaking mechanism was used to test the resistance to molten steel erosion. Microscopic observation of the eroded sample using a reflecting microscope revealed that the addition of Al2O3 and Cr2O3 favored the synthesis of magnesium aluminate spinel and magnesium-chromium spinel in the matrix of the periclase-spinel material, but not conducive to improving Magnesite - Spinel resistance to molten steel. Through thermodynamic analysis, Al2O3, Cr2O3, magnesia-chrome spinel and magnesia-alumina spinel have higher equilibrium oxygen content and higher solubility in molten steel. Cr2O3 and magnesia-chrome spinel have more balanced oxygen content in molten steel than Al2O3 and magnesia-alumina spinel, and are more easily decomposed in molten steel.