D01:10.133741.ism1001053x.2009.08.0I2 第31卷第8期 北京科技大学学报 Vol.31 No.8 2009年8月 Journal of University of Science and Technology Beijing Ag2009 玻璃包覆铁基合金微丝制备微熔池的稳定性 王成铎张志豪 谢建新 北京科技大学新材料技术研究院.北京100083 摘要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1.5~20g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， 关键词铁基合金：玻璃包覆：熔融纺丝：悬浮力：温度 分类号TG155.2 Stability of a micro molten pool for fabricating glass-coated Fe-based alloy mi- crowires WANG Cheng-duo,ZHANG Zhi-hao,XIE Jian-xin Advanced Materials and Technologies Institute.Uriversity of Science and Technology Beijng.Beijing 100083.China ABSTRACT To keep micro molten pools stable is a premise for fabricating glass-coated metal microw ires continuously by the glass- coated met spinning method.Theoretic calculation was used to analyze the effects of the stmuctural parameters of an induction heater. heating current,pool volume(mass)and position in the inducion heater on the temperature and levitation force of the Fe-based alloy micro molten pool.The levitation force of the mic molten pool,as the temperature is 1280C.increases with the increase in cone angle and bottom hole height of the induction heater,as well as the decrease of the induction heater's height.bottom hole radius and distance from the molten pool center to the upper surface of the bottom hole and reducing the heating current and the pool volume (mass)is beneficial to the decrease of the difference between gravity and levitation force.The appropriate strucural sizes of the inte- gral induction heater for preparing glasscoated Fe-based alloy microwires are the oone angle of the induction heater 120 to 130, height of the induction heater 12 to 14 mm.bottom hole height 2 to 4mm,ad bottom hole radius 3 to 4 mm.The reasonable dis- tance from the molten pool center to the upper surface of the bottom hole is 4 to 6mm and the suitable mass of the Fe-based alloy mi- cro molten pool is 1.5 to 2 0g.Using the optimized integral induction heater and keeping the volume (mass)of the Febased alloy micro molten poolalmost invariant by feeding continuously.glass coated Fe-based alloy microwires are fabicated continuously and sta- bly. KEY WORDS Fe-based alloys glass ooating:melt spinning:levitation force;temperature 玻璃包覆熔融纺丝法通过一道工序即可制备芯化了带绝缘层金属微丝的制备工艺到.采用该技 丝直径为5~I00m的玻璃包覆金属微丝，大大简 术制备的玻璃包覆微品或者非晶金属微丝具有优良 收稿日期：200811-28 基金项目：国防基础科研资助项目 作者简介：王成铎(1979一），男，博士研究生，谢建新(1958一），男，教授.博士生导师，E-maila:jxxie@mater.usth.c.m玻璃包覆铁基合金微丝制备微熔池的稳定性 王成铎 张志豪 谢建新 北京科技大学新材料技术研究院, 北京 100083 摘 要 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( 1 280 ℃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～ 14 mm, 下锥孔高度 2 ～ 4 mm, 下锥孔半径 3 ～ 4 mm .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～ 6 mm, 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. 关键词 铁基合金;玻璃包覆;熔融纺丝;悬浮力;温度 分类号 TG155 .2 Stability of a micro molten pool for fabricating glass-coated Fe-based alloy mi￾crowires WANG Cheng-duo, ZHANG Zhi-hao, XIE J ian-xin Advanced Mat erials and Technologies Institut e, Uni versit y of Science and Technology Beijing, Beijing 100083, China ABSTRACT To keep micro molten pools stable is a premise for fabricating glass-coated metal microw ires continuously by the glass￾coated melt spinning method.Theoretic calculation w as used to analy ze the effects of the structural parameters of an induction heater, heating current, pool volume ( mass) and po sition in the induction heater on the temperature and levitation force of the Fe-based alloy micro molten pool.The levitation force of the micro molten pool, as the temperature is 1 280 ℃, increases with the increase in cone angle and bo ttom ho le height of the induction heater, as well as the decrease of the induction heater' s height, bottom hole radius and distance from the molten pool center to the upper surface of the bo ttom hole, and reducing the heating current and the pool volume ( mass) is beneficial to the decrease of the difference between gravity and levitation force.The appropriate structuralsizes of the inte￾g ral induction heater for preparing g lass-coated Fe-based alloy microwires are the co ne angle of the induction heater 120 to 130°, height of the inductio n heater 12 to 14 mm, bottom hole height 2 to 4 mm, and bottom hole radius 3 to 4 mm .The reasonable dis￾tance from the molten pool center to the upper surface of the bottom hole is 4 to 6 mm and the suitable mass of the Fe-based alloy mi￾cro molten pool is 1.5 to 2.0 g.Using the optimized integral inductio n heater and keeping the volume ( mass) o f the Fe-based alloy micro molten poo l almost invariant by feeding continuously , glass-coated Fe-based alloy microwires are fabricated co ntinuously and sta￾bly. KEY WORDS Fe-based alloys;glass coating;melt spinning;levitation fo rce;temperature 收稿日期:2008-11-28 基金项目:国防基础科研资助项目 作者简介:王成铎( 1979—) , 男, 博士研究生;谢建新( 1958—) , 男, 教授, 博士生导师, E-mail:jxxie @mater .ustb.edu.cn 玻璃包覆熔融纺丝法通过一道工序即可制备芯 丝直径为 5 ～ 100 μm 的玻璃包覆金属微丝, 大大简 化了带绝缘层金属微丝的制备工艺[ 1-3] .采用该技 术制备的玻璃包覆微晶或者非晶金属微丝具有优良 第 31 卷 第 8 期 2009 年 8 月 北 京 科 技 大 学 学 报 Journal of University of Science and Technology Beijing Vol .31 No.8 Aug.2009 DOI :10.13374/j .issn1001 -053x.2009.08.012