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Subject:	Re: bismuth based solder
From:	"ddhillma" <[log in to unmask]>
Date:	Tue, 05 Nov 96 17:26:49 cst
Content-Type:	text/plain
Parts/Attachments:	text/plain (76 lines)

     Hi Bob - 
     
     Bismuth solders do not have the same mechanic properties as Sn63, have 
     problems with solder joint failures  when tin/lead becomes part of the 
     solder joint (a low melting alloy of 98C, the solder grain boundaries 
     become "hot short"), and it oxidizes very badly in a standard wave 
     solder machine without using an inert gas blanket. The NCMS Lead Free 
     project is in its final stage of wrapping up their efforts and a 
     report should be forth coming shortly. There were several bismuth 
     alloys in their test program and they looked at many processing and 
     reliability issues. Watch for their report.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: bismuth based solder
Author:  [log in to unmask] at ccmgw1
Date:    10/30/96 7:54 PM


     
     I have an assembly that requires a second solder process over a large 
     area of the assembly, thus the need for a lower temp solder.  I'm 
     looking for the risks associated with the use of bismuth solder 
     systems.  Thanks in advance for your help.
     
     Bob Bickers
     
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