Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Eco-Friendly: Lead-Free Joining of Electronic Components

15.12.2009
Using two lasers, electronic components can be welded onto circuit boards, thus avoiding the use of lead in soldering material.

The goal of a new research project at the Laser Zentrum Hannover e.V. (LZH) is to weld electronic components for televisions, cell phones, computers etc. quickly, easily and lead-free onto printed circuit boards.

To accomplish this, a "two-laser-solution" is being used. A green laser with low output power ensures optimal and repeatable process conditions, while an infrared laser with higher output power is used to actually weld the components. Since components are welded and not soldered, lead-based soldering material is not needed.

Infrared lasers (wavelength = 1064 nm) have already proven their value in numerous micro-welding applications. However, if copper or copper alloys must be joined, the laser beam is subject to reflection by material surface. Minor irregularities on the surface such as oxidation can have a highly negative influence on the process.

With the two-laser-solution, the component is first irradiated with a low-power, green laser (wave length = 532 nm) before the actual welding takes place. The radiation of the green laser is absorbed more easily, and the negative influences of irregularities on the component surface are minimized. Subsequently, the following welding process with the infrared laser can take place under consistent conditions, and the combination of the advantages of the two lasers - process safety at 532 nm and high output power at 1062 nm - can be used to produce high quality welds for electronic components.

The two-laser-process is important for industrial production for several reasons. Electronic assemblies are increasingly subject to higher temperatures, and accordingly, they cannot be soldered and must be welded. Also, welding does not need a soldering material and thus, the legal requirements for a lead-free joining technique can be fulfilled. To support industrial implementation, the LZH and the other project are working on the development of the necessary laser sources, circuit boards, optics, etc..

The project "SUPREME" is supported by the German Federal Ministry of Education and Research (BMBF) within the framework concept "Research for Tomorrow's Production", together with project management Forschungszentrum Karlsruhe, Production and Manufacturing Technologies division.

Contact:
Laser Zentrum Hannover e.V. (LZH)
Michael Botts
Hollerithallee 8
D-30419 Hannover
Tel.: +49 511 2788-151
Fax: +49 511 2788-100
E-Mail: m.botts@lzh.de
The Laser Zentrum Hannover e.V. (LZH) carries out research and development in the field of laser technology and is supported by the Ministry of Economic Affairs, Labour and Transport of the State of Lower Saxony (Niedersächsisches Ministerium für Wirtschaft, Arbeit und Verkehr).

Michael Botts | idw
Further information:
http://www.lzh.de

More articles from Materials Sciences:

nachricht Watching atoms move in hybrid perovskite crystals reveals clues to improving solar cells
22.11.2017 | University of California - San Diego

nachricht Fine felted nanotubes: CAU research team develops new composite material made of carbon nanotubes
22.11.2017 | Christian-Albrechts-Universität zu Kiel

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: New proton record: Researchers measure magnetic moment with greatest possible precision

High-precision measurement of the g-factor eleven times more precise than before / Results indicate a strong similarity between protons and antiprotons

The magnetic moment of an individual proton is inconceivably small, but can still be quantified. The basis for undertaking this measurement was laid over ten...

Im Focus: Frictional Heat Powers Hydrothermal Activity on Enceladus

Computer simulation shows how the icy moon heats water in a porous rock core

Heat from the friction of rocks caused by tidal forces could be the “engine” for the hydrothermal activity on Saturn's moon Enceladus. This presupposes that...

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Lightning, with a chance of antimatter

24.11.2017 | Earth Sciences

A huge hydrogen generator at the Earth's core-mantle boundary

24.11.2017 | Earth Sciences

Scientists find why CP El Niño is harder to predict than EP El Niño

24.11.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>