钢水温度和碳对镁铝尖晶石质耐火材料侵蚀的影响

Effects of Temperature of Molten Steel and Carbon on Corrosion of Magnesia Alumina Spinel Refractory

根据热力学分析和热态实验研究了钢水温度及其碳质量分数对镁铝尖晶石质耐火材料侵蚀的影响,并探讨了耐火材料的侵蚀机理。研究表明,提高温度将加剧钢水对耐火材料的侵蚀,随钢水中碳质量分数的增加,耐火材料的侵蚀指数先增加后减小。侵蚀机理包括:一是钢水中碳与耐火材料组分氧化镁反应化学侵蚀耐火材料;二是钢水向耐火材料内部的渗入以及低熔点物相在耐火材料颗粒界面的析出,降低了耐火材料颗粒间的结合力,加剧了钢水冲刷对耐火材料的损毁程度。

Thermodynamic analysis and hot condition experiment were used to study the effects of temperature of molten steel and mass fraction of carbon on the corrosion of magnesia alumina spinel refractory, and the corrosion mechanism was discussed. The results show that the corrosion of molten steel on the refractory could be aggravated and the corrosion index of the refractory increased and then decreased with the increasing of the mass fraction of carbon in molten steel. The corrosion mechanism included two respects, one was the chemical corrosion on the refractory surface by the reaction between carbon and magnesia, the other was the penetration of the molten steel into the refractory and the precipitation of the low melt-point compounds at interface between grains of the refractory, which would weaken the combining power of grains and aggravate the broken-down of the refractory caused by washing out of molten steel.