soldering without heat

[Modelworks]

Cool breakthrough by Carnegie Mellon University. They have managed to create magnetic nano structures , tiny particles in the solder that when hit with a 280Khz magnetic field heat and melt forming the solder connection. So you could apply it to a board and parts and use a magnetic field to only heat the solder and not the parts , not having to heat the board in ovens like now . It takes it about 45 seconds to do the reflow.

This could be HUGE. It gets rid of the heat issues and also the possibility of bad connections from improper heating and cooling in the standard methods. If I could afford it I would be buying stock in this process



http://wms.andrew.cmu.edu:81/nmvideo/CIT_MSE_11-12-09.mov

 

[PottedMeat]

Wow thats cool. Induction Cooking -> industrial style.

345 Amps @ 280KHz. I wonder how small you can make the coil. Would make for an interesting soldering station.
5% by weight eh?

 

[William Gaatjes]

Cool breakthrough by Carnegie Mellon University. They have managed to create magnetic nano structures , tiny particles in the solder that when hit with a 280Khz magnetic field heat and melt forming the solder connection. So you could apply it to a board and parts and use a magnetic field to only heat the solder and not the parts , not having to heat the board in ovens like now . It takes it about 45 seconds to do the reflow.

This could be HUGE. It gets rid of the heat issues and also the possibility of bad connections from improper heating and cooling in the standard methods. If I could afford it I would be buying stock in this process



http://wms.andrew.cmu.edu:81/nmvideo/CIT_MSE_11-12-09.mov

The link does not work for me


I found this link :

http://www.cmu.edu/news/news-notes/weekly/2010/January/january-21.shtml

If you browser search for solder you get the video.

But it also does not work here...

 

[Modelworks]

The link does not work for me


I found this link :

http://www.cmu.edu/news/news-notes/weekly/2010/January/january-21.shtml

If you browser search for solder you get the video.

But it also does not work here...

Try a right click, save link as
The file is mov or quicktime and some browsers don't like those.
It is a 38mb file.

 

[Brian Stirling]

Chips(die) have been connected via ultrasonic welding for long time -- not sure if magnetic would offer any advantage over ultrasonic.


Brian

 

[William Gaatjes]

Try a right click, save link as
The file is mov or quicktime and some browsers don't like those.
It is a 38mb file.

I tried it, but it will not download, no activity or traffic. Too bad...

Maybe it is posted on youtube as wel...

 

[irsei]

how does a powerful magnetic field effect electrical parts?

is this a procedure that can only be used for a limited number of steps?

 

[William Gaatjes]

how does a powerful magnetic field effect electrical parts?

is this a procedure that can only be used for a limited number of steps?

That is for me the big question too. :\