Bi—Sn—In系无铅易熔合金性能研究

利用X射线衍射仪、示差扫描量热分析仪和拉伸试验机，研究了易熔合金Bi-Sn-In的成分对合金结构、熔化特性和对黄铜钎焊接头抗拉强度的影响。结果表明：低铟含量的Bi-Sn-In易熔合金，由Bi、β-Sn和InBi相组成；随In含量增加，合金由Bi、BiIn、γ、β、β-sn、Bi3In5、BiIn2相等组成；在截面Ⅰ（Bi／In：61．8／28．2），Ⅱ（Bi／In=54．2／35．8），Ⅲ（Bi／In=46．2／43．8）分别存在一个低共熔点，在截面Ⅳ（Bi／In：34．7／55．3）存在两个低共熔点；且合金的液相线随Bi／In比例的降低而减小；Bi-Sn-In钎焊接头的抗拉强度随In含量的增加呈线性下降，随Sn含量的增加而上升。

Prediction on the viscosity of multi-component melts with a new geometric model

A geometric model for calculating the viscosity of multi-component melt fromrelated binary physicochemistry properties was derived based on Chou's thermodynamic geometricmodel. The model derived was employed to predict the viscosity of Au-Ag-Cu alloys. The results showthat the calculated viscosity for Au-Ag-Cu alloys meet the experimental data very well. In addition,the viscosity of Bi-Sn-In systems was also predicted with this model.