Formation Enthalpy, Free-Energy and Activity Coefficients of Sn-Pb Eutectic Solders
Based on Miedemas model, the enthalpy of formation, excess free-energy and partial molar excess free-energy of Sn-Pb binary alloy solders were calculated. The model of the activity coefficient for each component in the solders was established. The diagrams of enthalpy of formation, free energy versus composition and activity versus composition and temperature as well as activity coefficients as a function of composition and/or temperature were drawn. And then the relationship between the activity coefficients of elements Sn/Pb in the solders and temperature was obtained. The approaches to reduction in the volatilization of lead at high temperature were proposed from the point of views that the lead pollution to environment results from its chemical activity in the solder alloys.
Solders Enthalpy of Formation Activity Free-energy Volatilization
Guisheng GAN Fang CHEN Rongchang ZENG Yunfei DU Changhua DU
School of Materials Science and Engineering, Chongqing Institute of Technology,Chongqing 400050, Chi Chongqing Electromechanical Vocational Institute, Chongqing 400050, China
国际会议
重庆
英文
531-536
2008-06-09（万方平台首次上网日期，不代表论文的发表时间）