干扰频率与喷射压强对合金射流的影响  

Effect of perturbation frequency and spray pressure on liquid alloy jet instability

作　　者：于洋[1] 史耀武[1] 夏志东[1] 雷永平[1] 李晓延[1] 郭福[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《电子元件与材料》2009年第8期43-45,共3页Electronic Components And Materials

基　　金：国家"863"高科技发展计划资助项目(No.2002AA322040);"十一五"国家科技支撑重点资助项目(No.2006BAE03B02);北京市自然科学基金资助项目(No.012003);北京市属市管高等学校人才强教计划资助项目"环境协调连接材料与加工技术"学术创新团队计划资助项目;2006高等学校博士学科点专项科研基金资助项目(No.20060005006)

摘　　要：控制钎料合金射流形成均匀断裂是制备电子封装用微焊球的关键。采用计算流体动力学方法模拟、研究了干扰频率、喷射压强对液态Sn-58Bi钎料射流断裂及液滴下落过程的影响。结果表明,在同一喷射压强下,钎料射流存在一个最佳干扰频率,其断裂长度最小。当喷射压强从30kPa增加到100kPa时,最佳干扰频率从2.0kHz增加为4.0kHz,此时的射流断裂长度由2.8mm增加到7.1mm,液滴间距的均匀程度变好。数值模拟结果与Weber射流不稳定性理论的计算结果基本吻合。Liquid solder alloy jet breaking up uniformly is very important to produce mini-solder ball. The influence of perturbation frequency and spray pressure on Sn-58Bi liquid alloy jet breaking up into droplets, and the droplets falling in the gas medium to form mini-solder balls was simulated and studied by the computational fluid dynamics method. The results show that for a given value of the pressure, there is a optimal perturbation frequency; the jet breakup length is the shortest at the optimal perturbation frequency. With the increasing of spray pressure from 30 kPa to100 kPa, optimal perturbation frequency increases from 2.0 kHz to 4.0 kHz; jet breakingup length increases from 2.8 mm to 7.1 mm; and the distance homogeneity among the droplets formed after the jet breakingup are more uniform. The numerical simulating results meet well with Weber theorey calculation results.

关 键 词：微焊球 合金射流 喷射压强 干扰频率 

分 类 号：TG407[金属学及工艺—焊接]