In its raw state, I think not. The solder will not wet to aluminum directly.

If you plate the aluminum surface with silver you can solder it to the
copper on the board using a hot plate in the lab. Be aware that the CTE of
the two materials is different and will induce some stress to the materials
over temp cycling. But I have seen it successfully used in microwave
applications with Rogers ptfe copper clad materials and silver plated sheet
aluminum carriers. It's done routinely.


Bill Brooks - KG6VVP
PCB Design Engineer, C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
Datron World Communications, Inc.
_______________________________________
San Diego Chapter of the IPC Designers Council
Communications Officer, Web Manager
http://dcchapters.ipc.org/SanDiego/
http://pcbwizards.com

-----Original Message-----
From: Paul Truit [mailto:[log in to unmask]]
Sent: Friday, December 23, 2005 9:10 AM
To: [log in to unmask]
Subject: [TN] Solder Aluminum to a copper FR4 PCB

Can aluminum be soldered directly to an FR4 PCB using 63/37 solder paste or
SN100C solder paste?

Paul Truit Mfg. Eng.
RBB Systems, Inc.
4265C E. Lincolnway
Wooster, OH 44691
Ph. 330.567.2906 ext 514
Fax 330.263.5324


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