Strange that noone talks about the microstructure(asperity, porosity, voids etc) as also being a very important factor for successful soldering. We have been soldering on nickel plated parts for many years and if treated correctly, wetting is good enough. But, agree with you, one can't put the process into amateur hands. Ni needs longer time for obtaining maximum wetting, needs to be in N2 cabinets if it's naked, must not be touched with hands and needs a good process setup before producing. I would never dream of buying nickled parts from an unknown, must possibly make it yourself or have a very skilled co. When soldering on many things today, in fact you solder on Nickel, the flash is just for enabling the wetting mechanism. Once again: you can get into deep trouble with naked Nickel if you are not aware of the special nature of nickel soldering. With good knowhow, you can solder even on nickel.
/Ingemar Hernefjord
Ericsson Microwave Systems

-----Original Message-----
From: Nancy Trumbull [mailto:[log in to unmask]]
Sent: den 14 juni 2000 20:13
To: [log in to unmask]
Subject: [TN] Palladium > Nickel


Hi everyone,
  I've not been on for awhile.  We have been doing trial runs for a new product. Then I missed placed my brain and hurt myself by falling out of a hammock.  Yes, I know it sounds backwards doesn't it.
Any way I'm  hoping that this finds all of you  health and happy. Because believe me it only takes one study mistake to end it all.

Now  My Question : Sorry if this has already been addressed.
More than likely most or all of you  have been using these parts.
But this is our first notices of the change over..
Our supplier of condenser / ceramic chips has informed us of a coming change.
They are telling us that they are changing some of the condenser / ceramic chip from palladium to nickel.
I have looked up the different between the  element and properties.
in my handy little Thomas Pocket ref.  So I can see the  difference in numbers under elements
.  And I have noted the difference in the density, Melting and boiling points.
But I have to be honest It does not mean diddle squat to me.
So I have a lot of questions and need a lot of help.
   As
           1. Performance durability
           2. Structural difference that might give us issues now and in the further.
           3. The reliability of the part it is worst or better.
           4. Are these parts already out there ,  so I really have no worried at all.

If someone would be so kind to give me items that I do or
don't need to worried about , with reason why. I will greatly appreciate it.
My understanding is this is all happening because of the availability of palladium and cost.
I thank all of you for taking the time to read my e-mail and those of you that can and will help me out.
Nancy T.

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