Fe57Mo合金在1kPa硫蒸气中的高温硫化

Sulfidation of Fe5Mo in 1kPa S_2 Vapor at 700～900℃

用石英弹簧热天平测定了Fe57Mo合金在1kPa硫压、700～900℃的硫蒸气中的硫化动力学曲线。结果表明，合金在700℃遵从抛物线规律，800℃和900℃下则表现为线性规律。合金硫化由其中Mo的硫化控制，其动力学常数比相应条件下的纯铁慢3～4个数量级，但仍比纯钼硫化快得多。硫化产物层的演变过程为：首先生成Fes，其次出现FeS＋MoS2双层结构，最终变为Fes＋MoS2＋FeMo6S8三层结构。综合动力学行为和硫化层分析，探讨了合金的硫化机理。

The sulfidation kinetics of Fe57Mo in sulphur vapor at 700 ~ 900℃ under 1kPa sulphur pressure were measured wity a spiral quartz spring thermogravimetric balance. It illustrated that a parabolic law behaved at 700℃, but linear ones both at 800 and 900℃.The Arrhenius plot implied that the sulfidation of Fe57Mo was determined by the sulfidation of Mo within it. even though, sulfldation kinetic rate constants of the alloy were just 3~4 orders of magnitude lower that that of pure Fe, still much higher than that of pure Mo. SEM investigation showed that the microstructure of the sulfide scale frmed coud be signular (FeS),duplex (inner MoS2+ outer FeS), and triplex (inner FeMo6S8+ moS2 + outer FeS). Based on its kinetics and scate development, the sulfidation mechanism for Fe57Mo was discussed.