My (very limited) knowledge of so-called fatigue-resistant soldersis that
they are fairly normal eutectic solder alloys, but the particle size and
shape is carefully controlled, and the paste has a number of dopants added.
The overall effect is that FRS's have a slightly lower melting point than
normal and produce very fine-grained solder joints.

My feeling about them is that they only prolong the inevitable a little -
the joints will still tend to coarsen with time and temperature, and
intermetallic layers wil also grow. It's highly debatable whether the extra
cost of this type of solder is cost effective in terms of extending solder
joint life.

There is some info on the WWW about FRS's, but not a lot.

Peter



Phillip Hinton <[log in to unmask]>   18/09/2002 10:55 AM
Sent by: TechNet <[log in to unmask]>

Please respond to "TechNet E-Mail Forum."; Please respond to Hintpwb1

              To:  [log in to unmask]
              cc:  (bcc: DUNCAN Peter/Asst Prin Engr/ST Aero/ST Group)
              Subject: [TN] Theramal Fatigue Resistant Solder








All

In a presentation given by Tom Scimeca of Florida Cir Tech (time unknown)
on lead free solder he shows a graph on page 43 in which he graphs fatigue
of a "Sn63 Thermal Resistant Solder" compared to "Standard Sn63" and a
Sn/Cu with nickel (Nihon Superior Sn100C).  Does anyone know what the
"(Sn63) Thermal Resistant Solder" is

Phil Hinton
520-745-1013    .
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