热扩散对镀锡银钎料界面组织及熔化特性的影响
Effect of heat diffusion process on interface microstructure and melting characteristic of brazing filler metals with tin coatings
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摘要: 对带锡镀覆层的银钎料进行热扩散处理,采用差示扫描量热仪(DSC)、扫描电镜(SEM)、X射线衍射仪(XRD)研究热扩散工艺对其熔化温度和扩散界面组织、物相的影响. 结果表明,在扩散时间一定条件下,随着扩散温度升高,扩散界面层厚度增加;随着扩散温度升高或扩散时间延长,钎料的固、液相线温度均降低,熔化温度区间缩小;扩散界面层物相主要由棒状Ag3Sn相和块状Cu3Sn相组成;最佳热扩散工艺为220 ℃,24 h. 经最佳工艺处理后,扩散界面层厚度为9.1 μm,钎料中Sn含量为7.2%,此时钎料熔化温度区间为642.34 ℃~676.37 ℃. 与传统熔炼合金化方法相比,钎料中Sn含量提高近31%.Abstract: The heat diffusion process was applied to fabricate the brazing filler metals with tin coatings. The differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and X ray diffraction (XRD) were used to analyze the effect of heat diffusion process on the melting temperature, diffusion interface microstructure and phase of the brazing filler metals with tin coatings. The results show that the thickness of transition interface layer increase with the diffusion temperature under the condition of the working time is constant. The temperature of solid and liquid phase of brazing filler metals are decreased and the melting temperature range of brazing filler metals decrease with the diffusion temperature or working time increasing. The phase of diffusion interface are mainly compose of Ag3Sn and Cu3Sn. The optimum heat diffusion process are temperature of 220 ℃ and time of 24 h. Under the condition of the optimum heat diffusion process, the thickness of transition zone and the melting temperature range of brazing filler metal are 9.1 μm and 642.34 ℃~676.37 ℃. Then the tin content during the brazing filler metals is 7.2%, it's nearly 31% higher than that of traditional method.
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