高频电磁场作用下保护渣的结晶特性

Crystallization properties of flux under high frequency electromagnetic field

采用管式炉、高频加热炉和渣膜模拟仪分别提取了无磁场和高频电磁场作用下的保护渣渣膜,结合XRD衍射和矿相分析了高频电磁场作用下保护渣结晶特性的变化规律。建立了高频电磁场条件下的保护渣焦耳热场和流场的三维数学模型,研究了高频电磁场对保护渣结晶特性的影响机理。结果发现,在高频磁场作用下,保护渣渣膜没有生成新的物相,但结晶率明显升高,晶粒尺寸显著减小。高频电磁场为熔渣提供了一定能量并具有搅拌作用,是产生这一结果的主要原因。

Using the tube furnace, high-frequency heating furnace and mold slag film simulator, the flux film were made under tradional and high-frequency electromagnetic field conditions, and in combination with XRD diffraction and microscopic observation, the effect of high-frequency electromagnetic field on flux crystallization were analysised. On the other hand, a three dimensional finite element model of joule heat and fluid flow of high frequency electromagnetic field were developed to investigate the effect mechanism of flux crystallization properties under high-frequency electromagnetic field. The results show that there is no new phases generate under high-frequency electromagnetic field, but the high-frequency electromagnetic field can raise crystallization rate and reduce grain size significantly. It may be the main reason for this result that the high-frequency electromagnetic field provides a certain amount of energy and has a stirring effect on the mold flux.