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Proceedings Paper

Better quality of soldered joints through rapid laser-beam reflowing
Author(s): Fritz Herbert; Lutz Dorn
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Paper Abstract

Rapid laser-beam reflowing turned out as an effective method for improving the structure based characteristics of solders and joints all the more with the application of higher melting contemporary Pb-free solders. The basic investigations on laser-beam induced rapid reflowing processes and the generation of grain-refined, restructured solder joints and metallization systems have been carried out on several unleaded alloys. The experimental tests have been concerned with structure, hardness; shear strength, wettability and long-term behavior. Grain refining and higher strengths of solder joints have been detected as the most substantial results after rapid reflowing. Leads that were laser-beam soldered under rapidly reflown solder showed about 10-40% higher shear strengths than in cases of using non-reflown solder. The maximum shear strengths have been attained by using rapidly reflown SnAg3, 8CuO, 7Sb0,2. Higher strength appeared in consequence of grain refining and increasing hardness, but also of structure stabilization due to Cu diffusion. Structure characteristics and strength did not weaken even after extended TCT.

Paper Details

Date Published: 19 April 2002
PDF: 5 pages
Proc. SPIE 4755, Design, Test, Integration, and Packaging of MEMS/MOEMS 2002, (19 April 2002); doi: 10.1117/12.462870
Show Author Affiliations
Fritz Herbert, Technische Univ. Berlin (Germany)
Lutz Dorn, Technische Univ. Berlin (Germany)


Published in SPIE Proceedings Vol. 4755:
Design, Test, Integration, and Packaging of MEMS/MOEMS 2002

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