Platinum coated silver powder

Details Platinum coated silver powder Platinum coated silver powder

1982-08-25

1984-03-27

Rutledge, L. Dewayne

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

106 119, 106 121, 427217, 427437, C09D 524, C23C 302, B22F 102

Patent

active

044394683

ABSTRACT:
A metallic powder having a core of silver and an outer layer of platinum wherein the silver is from about 90 to about 99.5% by weight of the total composition. A process for producing such a powder comprising forming a first aqueous slurry of silver powder, an appropriate amount of lignosulfonate ammonia and water, forming a second slurry of platinum as a platinum-ammonium complex dispersed in a water soluble alkanol, mixing the first and second slurry, adjusting the pH of the mixture to a range of from about 8 to about 10, adding an appropriate amount of hydrazine to the mixture maintaining the resultant slurry at about 40.degree. C. to 60.degree. C. for an appropriate time to coat the platinum onto the silver, then separating the platinum-coated silver powder from the remainder of the slurry.

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patent: 3486928 (1969-12-01), Rhoda et al.
patent: 3531301 (1970-09-01), Watson
patent: 3620713 (1971-11-01), Short
patent: 3620714 (1971-11-01), Short
patent: 3788833 (1974-01-01), Short

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