镀锡银钎料扩散过渡区的物相和形成机制

发布时间：2018-05-08 02:02

本文选题：镀锡银钎料 + 扩散过渡区　；参考：《材料导报》2017年08期

【摘要】：采用温度梯度法对镀锡银钎料进行热扩散处理,形成了扩散过渡区。为了揭示镀锡银钎料扩散过渡区的形成机制和主要物相的形成过程,借助金相显微镜、扫描电镜(SEM)、能谱分析仪(EDS)、X射线衍射分析仪(XRD)对扩散过渡区的显微组织、Sn元素的面扫描分布、物相组成及形貌进行分析。研究表明,Sn元素在镀锡银钎料中分布均匀、无偏析,在扩散过渡区主要以棒状Ag_3Sn相和块状Cu_3Sn相存在。随着热扩散温度升高,Ag_3Sn相和Cu_3Sn相的相对衍射强度逐渐增大。Ag_3Sn相的形成过程分为三个阶段:Ag_3Sn颗粒相弥散分布、Ag_3Sn颗粒相互相接触合并、生成大块棒状化合物相。Cu_3Sn相主要是锡晶须生长冲破镀层的氧化膜,在张应力和压应力协同作用下形成。镀锡银钎料扩散过渡区的形成机制为"钎接、互扩散、亚稳态、合金化"。
[Abstract]:In order to reveal the formation mechanism of the diffusion transition zone and the formation of the main phase, the microstructure of the diffusion transition zone of the silver solders was revealed by the temperature gradient method. In order to reveal the formation mechanism of the diffusion transition zone and the formation process of the main phase, the microstructure of the diffusion transition zone was obtained by means of metallographic microscope, scanning electron microscope (SEM), energy spectrum analyzer (EDS) and X ray diffraction analyzer (XRD). Sn The surface scanning distribution, phase composition and morphology of the elements are analyzed. The study shows that the Sn elements are distributed uniformly in the silver plated solder, and there is no segregation in the diffusion transition zone. The relative diffraction intensity of the Ag_3Sn phase and Cu_3Sn phase increases gradually as the heat diffusion temperature increases, and the formation of.Ag_3Sn phase is gradually increased. It is divided into three stages: the dispersed distribution of Ag_3Sn particles and the interaction of Ag_3Sn particles, the formation of large block of rod like phase.Cu_3Sn phase is mainly the growth of the oxide film of tin whisker, which is formed under the synergistic action of tensile stress and pressure stress. "Change".

【作者单位】：华北水利水电大学机械学院;南京理工大学材料科学与工程学院;郑州机械研究所新型钎焊材料与技术国家重点实验室;
【基金】：河南省自然科学基金(HZK170158) 河南省高等学校重点科研项目(17A430021) 华北水利水电大学博士基金
【分类号】：TG425

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