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Prevention of Corrosion on MST Modules

IP.com Disclosure Number: IPCOM000075555D
Original Publication Date: 1971-Oct-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Berenbaum, L: AUTHOR

Abstract

Some field returns of MST modules are designated failures due to corrosion. The "open" always occurs in the dewet region adjacent to the glass dam and the corrosion product identified with the fail is always A(g2)C.

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Prevention of Corrosion on MST Modules

Some field returns of MST modules are designated failures due to corrosion. The "open" always occurs in the dewet region adjacent to the glass dam and the corrosion product identified with the fail is always A(g2)C.

The corrosion of MST modules is directly related to the large surface area that is exposed to corrosive environments as a result of the high porosity of the Ag-Pd paste. An experiment in which ARELDITE** was used to fill in the pores, showed about 30% porosity in a cross-sectional analysis. When the porosity is this high, the pores are obviously interconnected. This means that contaminants (fluxes, washes, etc.) which are trapped in the pores may be capable of being transported throughout the structure in the liquid or solid state during fabrication or in field operations. It would also provide an open path for transport of corrosive gases that are always present in the atmosphere.

If the porosity were to be decreased to a point where the pores were no longer interconnected, it would prevent the "infinite source" capability of contaminants to corroding areas. This increase in the density of the current carrying material would decrease the exposed surface area and, therefore, take longer to corrode to form an "open". Taking the most optimistic outlook, a reduction of porosity could prevent any serious corrosion from ever occurring on the modules because it would prevent corrosive chemicals or catalysts from reachi...