Abstract/Details

Characterization of FR-4 printed circuit board laminates before and after exposure to lead-free soldering conditions


2008 2008

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Abstract (summary)

The transition to lead-free soldering of printed circuit boards (PCBs) using solder alloys such as Sn/Ag/Cu has resulted in higher temperature exposures during assembly compared with traditional eutectic Sn/Pb solders. The knowledge of possible variations in the PCB laminate material properties due to the soldering conditions is an essential input in the selection of appropriate laminates.

An experimental study was conducted to investigate the effects of lead-free processing on key thermomechanical, physical, and chemical properties of a range of FR-4 PCB laminate materials. The laminate material properties were measured as per the IPC/UL test methods before and after subjecting to multiple lead-free soldering cycles.

The effect of lead-free soldering conditions was observed in some of the material types and the variations in properties were related to the material constituents. Fourier transform infrared (FTIR) spectroscopy and combinatorial property analysis were performed to investigate the material-level transformations due to soldering exposures.

Indexing (details)


Subject
Mechanical engineering;
Materials science
Classification
0548: Mechanical engineering
0794: Materials science
Identifier / keyword
Applied sciences; FR-4; Halogen-free; Lead-free; Printed circuit board; Reflow
Title
Characterization of FR-4 printed circuit board laminates before and after exposure to lead-free soldering conditions
Author
Sanapala, Ravikumar
Number of pages
75
Publication year
2008
Degree date
2008
School code
0117
Source
MAI 47/01M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549661931
Advisor
Pecht, Michael
University/institution
University of Maryland, College Park
Department
Mechanical Engineering
University location
United States -- Maryland
Degree
M.S.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1454361
ProQuest document ID
219997606
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/219997606
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