Modeling the effect of lead-free soldering on flexible substrates
Rizvi, M.J., Yin, Chunyan and Bailey, Christopher (2006) Modeling the effect of lead-free soldering on flexible substrates. [error in script] IEEE, Piscataway, NJ, USA, pp. 1038-1042. ISBN 1424408334; 1424408342 (doi:10.1109/EMAP.2006.4430695)Full text not available from this repository.
Flexible Circuit Boards (FPCs) are now being widely used in the electronic industries especially in the areas of electronic packages. Due to European lead-free legislation which has been implemented since July 2006, electronic packaging industries have to switch to use in the lead-free soldering technology. This change has posed a number of challenges in terms of development of lead-free solders and compatible substrates. An increase of at least 20-50 degrees in the reflow temperature is a concern and substantial research is required to investigate a sustainable design of flexible circuit boards as carrier substrates. This paper investigates a number of design variables such as copper conductor width, type of substrate materials, effect of insulating materials, etc. Computer modeling has been used to investigate thermo-mechanical behavior, and reliability, of flexible substrates after they have been subjected to a lead- free solder processing. Results will show particular designs that behave better for a particular rise in peak reflow temperature. Also presented will be the types of failures that can occur in these substrates and what particular materials are more reliable.
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