乡亲们
锡须是锡表面形成的非常细的锡丝或锡须。见图 1。它们是锡中应力释放的结果。锡须是一种初次遇到时令人惊讶的现象，因为它们的形成似乎并不直观。
图 1.请注意，与人的头发相比，锡须是多么的纤细。图片来自 美国国家航空航天局锡须网站
They are a concern, as they can cause electrical short circuits or intermittent short circuits as a fusible link. Leadin tin-lead solder greatly suppresses tin whisker growth. Therefore, with the advent of lead-free solders there is a justifiable concern for decreasing reliability due to tin whisker growth in electronics.
Tin whiskers can vary in length and width, as is seen in Figure 2. Note that although only about 10% are as long a 1000 microns (1 mm). That length and occurrence rate is such as to cause many reliability concerns.
图 2.一些锡须的长度和宽度。资料来源也是 NASA 锡须网站。
在接下来的几周里，我计划发布锡须是如何形成的，以及缓解锡须的策略。我将发布的大部分信息来自我与Annaka Balch在SMTA PanPac 2019上发表的一篇论文。
美国国家航空航天局（NASA）有一个出色的网站，提供了许多有关锡须的信息，也是锡须造成历史性重大故障的资料来源。
干杯
罗恩博士
