【摘要】 为了提高Mo-Mgo金属陶瓷保护管的使用寿命,探讨其物理化学腐蚀过程,对使用后的保护管进行取样分析,并对该种金属陶瓷制成的坩埚进行铁、钢,渣等诸因素的腐蚀试验研究,结果表明:Fe-Mo互溶是保护管中金属相蚀损的基本原因;Fe-c熔体中[C]含量、炉渣的氧化性是影响保护管蚀损的主要因素;生铁对保护管的腐蚀作用强,渣次之,钢最轻微。目前我国首创的Mo-MgO金属陶瓷保护管是较好的抗钢和熔渣等熔体侵蚀的耐热材料。研究结果可供保护管研制及现场合理使用作参考。更多还原

【Abstract】 Mo-MgO ceramal casing tubes,useful for shielding thermocouples during continuous measurement of the temperature of molten steel,has been applied to such pilot-plants as converters,electric arc furnaces and ladles since it was first developed in 1974.It has been found that some Mo-MgO ceramal casing tubes differ from each other in their service life.In order to find out the corrosion mechanism and to prolong the service life of these casing tubes,several corrosion experiments were performed by analyzing the samples of Mo-MgO ceramal casing tubes of different lifetimes.Moreover,a physicochemical experiment was done for determining the corrosion effect of such factors as pigging,steel and slag with a crucible made from the same material as Mo-MgO ceramal casing tube.The results of the experiments were as follows.1.Corrosion resistance to steel or slag of Mo-MgO ceramal not only depends on its constituents but on its microstructure.2.With the shielding atmosphere of inert gas at temperature 1650℃,the ceramal is corroded by pigging,slag and steel in order of their corrosivity.3.The miscibility between Fe and Mo is the dominant factor of metallic phase corrosion and the corrosion speed depends to a large extent on the diffusion rate of Fe in Mo-Fe solid,solution and the thinner the interlayer,the more quickly the ceramal corrodes.4.The corrosion effect of Fe-C melt on Mo-MgO ceramal is intensified with the increase of carbon contents.5.The corrosion effect of slag on Mo-MgO ceramal is mainly decided by the oxidizability of slag.更多还原