Hello Scott, 

 

Do I read it right that you want to plate aluminum bonding wire with  another 

metal and that the wires are 300 microns in diameter?  I have not  heard of 

such but perhaps someone else has. Is there a reason why you cannot  

encapsulate the wires after bonding to address oxidation concerns? 

 

There are also some folks out there who have developed insulated wire  that 

is bondable  and there are as well some methods from earlier years  such as 

stitch wire and/or resistance welding of ribbon wire that might be of  interest. 

 

But it might be best to talk to some of the heavy gage wire bonding  

equipment suppliers to gather their experiences.

 

Good luck

Joe 

 

 

 

 

In a message dated 7/14/2008 11:49:41 A.M. Pacific Daylight Time,  

[log in to unmask] writes:



Hello.  New to the list and wedgebonding.  Searched the  archives.  I saw 

posts about bonding to plated pads on boards, but  saw nothing on using or 

bondability with plated wires.



I must avoid  any oxidation on the wires.  I'm trying to find out successes,  

feasability and wire suppliers for plated aluminum wire.  Gold  plating is 

the best 

for the outer coating for me.  From what I've  read its actually 150 

microinches 

Ni over 5-8 microinches of Au. Also from  what i've read, the nickel is doing 

the 

actual bonding.



The wire is  .012" or 305 um diameter. Pure gold it out of the question! :)



The  bonding surface is copper etched PCB, or sometimes gold plated brass.   

Both proven to bond well with pur AL wire.



Thank  you!



--Scott



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