We are using AgPd conductor paste 6120 (Dupont) for thick film HMC technology.
Chemical Composition includes Ag, Pd & other materials like -- Platinum, Ruthenium, Glass powder, Resin etc also exists.
1. What is the % of each material?
2. How to evaluate AgPd composition?
3. What should be the ratio of Ag & Pd for thick Film HMC technology? (This is printed on 96% Alumina substrate)
4. Whether Pd content is the most important part?
5. What will happen if Pd content is less?
6. How to evaluate a conductor paste?
7. Whether paste can be Re-validated? If yes, then How long?
8. What is the Re-Validation process for any paste?
Dear Soumi,
I just came across your very interesting technical question(s). Unfortunately I'm not a proven specialist in this field as we work in synthetic inorganic chemistry. For some basic information please have a look at the following potentially useful article which might help you in your analysis:
Silver‐Palladium Thick‐Film Conductors
Article Silver‐Palladium Thick‐Film Conductors
Unfortunately this paper has not yet been posted by the authors as public full text on RG. However, two of the authors have RG profiles, so that you can easily contact them directly via RG and request the full text. You can also discuss your questions directly with the authors of the article as they are the experts in this field of research.
As for the exact composition of AgPd conductor paste 6120 (Dupont), chances are that you will find no detailed information. Normally such items are patented and kept secret by the companies who manufacture them.
Good luck with your work!
Silver migration occurring in pure silver conductive thick films was minimized by using Ag-Pd alloys. The in situ microscopic observation, under humid environment and an applied d.c. field, showed that the out-growth of silver dendrites from the cathode decreases with increasing (5–20%) amount of Pd in the Ag-Pd specimens, and ceases completely at 30% Pd.
Ag Pd paste is a dispersion of Ag powder and Pd powder with different size/morphology in a solvent based organic vehicle. For the revalidation: mix by hand and verify if you have a solid deposit. YES: 3 roll milling, NO go ahead. After that check rheo-viscosity with certificate. If OK check resistivity (fire on alumina at 800°C, more or less). Hope this help.
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