Chemistry: electrical and wave energy – Processes and products
Patent
1989-06-16
1990-05-08
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 431, 204 445, 204DIG6, 427130, 427131, 428695, 428692, 360131, 360135, C25D 510, C25D 356, C25D 364, G11B 584
Patent
active
049235745
ABSTRACT:
A magnetic recording member with a thin metallic antifriction protection overcoat formed over a magnetic layer. The overcoat is soft ductile and low stress and includes a metal selected from the group consisting of palladium, platinum, silver, gold, cadmium, indium, tin and lead or an alloy of one or more of these metals, and may include less than 20 percent by weight of antimony, bismuth, thallium or copper to improve wear resistance or impede corrosion. In one preferred embodiment the antifriction overcoat is an alloy of silver, lead and antimony formed with N layers where 10.ltoreq.N.ltoreq.40. The even layers are richer in a selected metal of the alloy than the odd layers in order to produce adjacent layers with different lattice or microstructural and associated mechanical properties so that there tends to be parallel shear between adjacent layers under sharing stress of head impact or friction. The metallic antifriction overcoat is formed by electroplating and the layers are formed by cyclically modulating the plating current density (or cathode potential) in order to form the N layers each having a selected thickness and a selected composition.
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Niebling John F.
Starsiak Jr.
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