简化热传导模型与再流焊参数分析

再流焊接工艺作为SMT生产线上的核心工艺环节,其质量与效率的提高集中体现在再流焊温度曲线的优化与控制上。再流焊焊接工艺仿真与预测研究越来越受到关注。提出了再流焊焊接工艺仿真简化模型,将其应用于计算机辅助分析中,预测再流焊温度曲线,辅助工艺制定。     

锡铜无铅焊料在电路板组装中的应用

在无铅组装工艺中,大多数电路板组装厂优先采用低成本焊料合金。没有添加剂的锡铜无铅焊料本身存在局限性,可是添加某种成份后,就能克服锡铜焊料通常所遇到的不足之处。文章分析了几种锡铜焊料相对于SAC焊料的特点,并叙述了它们在波峰焊和手工焊接工艺中的应用情况。     

Liquid Metal based Stretchable Room Temperature Soldering Sticker Patch for Stretchable Electronics Integration (Adv. Funct. Mater. 36/2023)

Researchers are eagerly developing various stretchable conductors to fabricate devices for next-generation electronics. Most of the major problems in stretchable electronics happen at the connection between rigid and soft parts and the development of reliable soldering material is a major hurdle in stretchable electronics. Though there are attempts to devise new soldering processes for integrating chips and stretchable conductors, they still possess limitations such as mechanical stability, mass production, sophisticated processes, and restricted candidates for conductors and substrates. Here, this study presents a room-temperature universal stretchable sticker-like soldering process that can stretchably solder multiple spots at once and directly fabricates a stretchable device in an in situ manner while a target conductor is installed on one's body. The solder developed in this research possesses high conductivity with a unique freestanding feature enabling the process. It can be elongated when directly positioned between a rigid chip and a rigid conductor, demonstrating its extraordinary stretchability. It is expected that this simple but unique stretchable soldering technique utilizing the invented solder will allow the integration of functional stretchable conductors with highly advanced rigid chips for next-generation stretchable electronics.