Better quality of soldered joints through rapid laser-beam reflowing

Fritz Herbert; Lutz Dorn

doi:10.1117/12.462870

19 April 2002 Better quality of soldered joints through rapid laser-beam reflowing

Fritz Herbert, Lutz Dorn

Proceedings Volume 4755, Design, Test, Integration, and Packaging of MEMS/MOEMS 2002; (2002) https://doi.org/10.1117/12.462870
Event: Symposium on Design, Test, Integration, and Packaging of MEMS/MOEMS 2002, 2002, Cannes-Mandelieu, France

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.

Citation Download Citation

Fritz Herbert and Lutz Dorn "Better quality of soldered joints through rapid laser-beam reflowing", Proc. SPIE 4755, Design, Test, Integration, and Packaging of MEMS/MOEMS 2002, (19 April 2002); https://doi.org/10.1117/12.462870

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available