冶金熔体泡沫分类的研究

冷态和热态模拟实验结果证实冶金熔体产生的泡沫化现象与水溶液-气泡系统的泡沫化现象有相似规律。铁水熔池终还原阶段形成的泡沫渣和熔融发泡法制备的铝合金泡沫,均存在球状泡沫型和多面体泡沫型2种不同形态的泡沫结构。气源类型、泡沫形成环境和熔体的物理化学性质是影响冶金熔体泡沫结构及其稳定性的主要因素。

Classification on the Foaming Behaviours in Metallurgical Melts

Based on experimental results, it shows that the foaming behaviours occurred in metallurgical melts is similar to that taken place in aqueous solution. There are two types of foam structure, spherical foam and polyhedral foam, in the bath-smelting processes and the foaming process of Al alloy melt. Foams with large bubbles, generated by argon gas injection into liquid slag with a mon-orifice nozzle, have polyhedral bubble cells and the foamability of slag is affected by the gas injection rate and container scale besides the surface tension and the viscosity of slag. Foams with fine bubbles, generated by slag/metal interfacial reaction in the bath-smelting prcx^ess or the decomposition of TiH₂ in molten Al alloy, have spherical bubble cells in the initial foaming stage and the translation from spherical bubble structure into polyhedral bubble structure takes place at the end of foaming process. Under conditions of gas evolution due to chemical reaction in melts, the foam stability is strongly affected by the rate of gas evolution, the size of bubbles and the fluid flow form besides the physico-chemicaJ properties of melts.