Browse Prior Art Database

Silver Bearing Conductive Pastes

IP.com Disclosure Number: IPCOM000081641D
Original Publication Date: 1974-Jul-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Greenwood, RW: AUTHOR

Abstract

By controlling the particle size ratio (surface area ratio) and the breadth of the particle size distribution of the inorganic constituents of conductive pastes, improved resistance to tarnishing of the major constituent silver has been observed.

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Silver Bearing Conductive Pastes

By controlling the particle size ratio (surface area ratio) and the breadth of the particle size distribution of the inorganic constituents of conductive pastes, improved resistance to tarnishing of the major constituent silver has been observed.

This concept has been demonstrated on both the silver-palladium, and silver- palladium oxide systems.

Specifically matching of the particulate densities, and particulate size, with a controlled distribution of glass particles, has significantly enhanced the resistance of these systems to tarnishing.

The optimum ratios for palladium/silver and palladium oxide/silver ratios in that order are 0.90-0.94, and 1.09-1.13. The breadth of the distributions at two standard deviations should be 0.45 micron or less.

A fine classified glass powder with an optimized metallurgy of palladium- silver has also shown a significant increase in adhesion of the lands to the substrate (alumina).

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