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保持微熔池稳定是采用玻璃包覆熔融纺丝法连续稳定制备微丝的前提.采用理论计算分析了感应加热器结构参数、加热电流、微熔池的体积、微熔池在感应加热器中的位置等因素对铁基合金微熔池温度和所受悬浮力的影响,获得了保持微熔池稳定的合理工艺参数.在合适的拉丝温度(1280℃左右)下,增大感应加热器锥角和下锥孔高度,减小感应加热器高度、下锥孔半径以及微熔池中心与下锥孔上端面之间的距离,均有利于提高铁基合金微熔池所受悬浮力;减小电流的同时减小微熔池的体积(质量),有利于减小重力与悬浮力差值.在本文研究条件下,整体感应加热器的合理结构尺寸为:感应加热器锥角120～130°,感应加热器高度12～14mm,下锥孔高度2～4mm,下锥孔半径3～4mm.微熔池中心与感应加热器下锥孔上端面之间的合理距离为4～6mm,合适的微熔池质量为1.5～2.0g.采用结构优化的整体感应加热器,并通过连续进料使微熔池的体积(质量)保持基本不变,实现了玻璃包覆铁基合金微丝的连续稳定制备.
Maintaining the stability of the micro-melting pool is the prerequisite for the continuous and stable preparation of microfilaments by the glass-coated melt spinning method.The structural parameters of the induction heater, the heating current, the volume of the micro-melt pool are analyzed theoretically, and the micro-melting pool in the induction heater And other factors on the micro-pool iron-based alloy micro-pool temperature and the impact of levitation force obtained to maintain the stability of micro-pool stability of the reasonable process parameters at a suitable drawing temperature (about 1280 ℃), increase the induction heater cone Angle and lower cone hole height, reducing the height of the induction heater, the lower cone hole radius and the distance between the center of the micro-melting pool and the upper end surface of the lower cone hole are conducive to raising the levitation force of the iron-based alloy micro-melting pool; Small current while reducing the volume of micro-pool (mass), is conducive to reducing the difference between gravity and suspension force.In this study, the overall structure of the reasonable size of the induction heater: induction heater cone angle 120 ~ 130 °, the height of the induction heater is 12 ~ 14mm, the height of the lower cone is 2 ~ 4mm, and the radius of the lower cone is 3 ~ 4mm.The reasonable distance between the center of the micro-melting pool and the upper surface of the cone under the induction heater is 4 ~ 6mm, The micro-pool quality of 1.5 ~ 2.0g. Adopt the structure of excellent Integrated induction heater, and continuously changing the volume (mass) of the micro-melting pool through continuous feeding to achieve continuous and stable preparation of the glass coated iron-based alloy micro-filaments.