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本文采用各种特定的盐与75％硅铁,以不同比例机械混合,配制成不同复合孕育剂,对稀土—Ca系蠕铁进行了孕育尝试。所进行的工作表明:当少量硅铁中添加激量的锶盐、钡盐或其混合盐,在其总的加入量为蠕铁正常孕育量的1/2以下时,则可稳定地获得蠕化率≥80％,渗碳体<3％,铁素体为50～60％的蠕铁。同时发现,在同样条件下,当配入混合盐时,其孕育效果要优于添加单一的盐类。从近代的脱氧、脱氮的气体孕育学说出发,本文分析了含盐类添加物的硅基复合孕育剂高效的原因在于:盐类添加物不仅能为石墨结晶提供热力学上较稳定的核心,而且还能使铁水较大的脱氧、脱氮。进而提出,固—气双重作用的孕育原理,乃是实现复合孕育剂高效孕育的重要途径。
In this paper, a variety of specific salts and 75% ferrosilicon were used, mechanically mixed with different proportions, and formulated into different compound inoculants to inoculate the rare earth-Ca-based vermicular iron. The work carried out shows that when a small amount of ferrosilicon is added with strontium salts, barium salts or mixed salts thereof, the total amount of strontium salts, Rate of ≥ 80%, cementite <3%, ferrite 50 ~ 60% of vermicular iron. Also found that, under the same conditions, when mixed with salt, its inoculation effect is better than adding a single salt. Starting from the modern theory of deoxygenation and denitrification, this paper analyzes the reason why silicon-based inoculant with salt additives is highly effective because salt additives not only provide a thermodynamically stable core for graphite crystallization, but also Also make the larger hot metal deoxygenation, denitrification. Furthermore, it is proposed that the principle of inoculation with the double effect of solid-gas is an important way to realize the efficient inoculation of compound inoculant.