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Electroless platinum weld to electroless Indium

We are not that experienced with electroless plating techniques but certainly have an interest in this technology for our future semiconductor projects. I am looking at soldering two substrates:

1) Substrate 1: Electroless nickel selectively plated on an aluminum pattern through a polymer mask and, to prevent against nickel oxidation during further processing of this first substrate and allow its soldering to the second substrate containing the solder, electroless platinum to be selectively plated over this electroless nickel;

2) Substrate 2: Electroless nickel to be again selectively plated on another aluminum pattern through another polymer mask and then electroless indium to be plated on the electroless nickel through the same polymer mask.

Here are the BIG two questions:

a) Will this electroless indium of the second substrate weld to the electroless platinum of the first substrate if they are pressed together when at a temperature over the melting point of indium and then cooled-down below this temperature;

b) Is there anything wrong with this idea?

Luc Ouellet
a semiconductor mfgr. - Bromont, Quebec, Canada
2003

what electroless indium process are you using?....we are looking for such a process to coat our graphite fibers for electronic heat transfer. thanks, Jay B.

Jay Browne
- Longmont, Colorado, USA
August 5, 2008