| Effect of Nd and La on surface tension and wettability of Sn-8Zn-3Bi solders |
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| 作者姓名： | 周健 孙扬善 薛烽 |
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| 作者单位： | Department of Material Science and Engineering, Southeast University, Nanjing 210096, China |
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| 摘 要： | Maximum bubble pressure measurement was employed to evaluate surface tension of Sn-8Zn-3Bi- （0-0.15）Nd and Sn-8Zn-3Bi-（0 -0. 15）La solder melts. Wetting balance method was used to measure wetting force and wetting time on Cu substrate of the two group solders. The experimental results show that minute amount of Nd or La addition to Sn-8Zn-3Bi solder causes significant decrease of the surface tension of the solder melts at 200 - 240 ℃ and Nd addition is more effective on reduction of surface tension than that of La. Nd or La addition has the effect on enhancing the wetting force of the solder melts on Cu substrate, which results from the de- crease of interracial tension between the solder melt and Cu substrate. The wetting force reaches the maximum when 0.1% Nd is added to the base alloy. The contact angle between Sn-8Zn-3Bi base solders and Cu substrate decreases with the addition of Nd or La and the minimum of the contact angle is obtained from the solder with 0.1% Nd addition.
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| 关 键 词： | 钕 镧 焊接材料 泡沫 锌 可湿性 |
| 文章编号： | 1003-6326（2005）05-1161-05 |
| 收稿时间： | 2005-02-21 |
| 修稿时间： | 2005-06-06 |
Effect of Nd and La on surface tension and wettability of Sn-8Zn-3Bi solders |
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| ZHOU Jian,SUN Yang-shan,XUE Feng.Effect of Nd and La on surface tension and wettability of Sn-8Zn-3Bi solders[J].Transactions of Nonferrous Metals Society of China,2005,15(5):1161-1165. |
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| Authors: | ZHOU Jian SUN Yang-shan XUE Feng |
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| Abstract: | Maximum bubble pressure measurement was employed to evaluate surface tension of Sn-8Zn-3Bi(0-0.15)Nd and Sn-8Zn-3Bi-(0- 0. 15)La solder melts. Wetting balance method was used to measure wetting force and wetting time on Cu substrate of the two group solders. The experimental results show that minute amount of Nd or La addition to Sn-8Zn-3Bi solder causes significant decrease of the surface tension of the solder melts at 200 - 240 ℃ and Nd addition is more effective on reduction of surface tension than that of La. Nd or La addition has the effect on enhancing the wetting force of the solder melts on Cu substrate, which results from the decrease of interfacial tension between the solder melt and Cu substrate. The wetting force reaches the maximum when 0.1% Nd is added to the base alloy. The contact angle between Sn-8Zn-3Bi base solders and Cu substrate decreases with the addition of Nd or La and the minimum of the contact angle is obtained from the solder with 0.1% Nd addition. |
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| Keywords: | lead-free solder zinc neodymium lanthanum surface tension wettability |
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